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Chen, Chunfei, Leilei Yu, Fengwei Tian, Jianxin Zhao i Qixiao Zhai. "Identification of Novel Bile Salt-Tolerant Genes in Lactobacillus Using Comparative Genomics and Its Application in the Rapid Screening of Tolerant Strains". Microorganisms 10, nr 12 (30.11.2022): 2371. http://dx.doi.org/10.3390/microorganisms10122371.
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Under bile salt treatment, strains display significant differences in their tolerance ability, suggesting the existence of diverse resistance mechanisms in Lactobacillus; however, the genes involved in this protective process are not fully understood. In this study, novel target genes associated with bile salt tolerance in Lactobacillus were identified using comparative genomics for PCR detection and the rapid screening of tolerant strains. The bile salt tolerance of 107 lactobacilli isolated from different origins was assessed, and 26 strains with comparatively large differences were selected for further comparative genomic analysis. Tolerant strains had 112 specific genes that were enriched in the phosphotransferase system, the two-component system, carbohydrate metabolism, and the ATP-binding cassette transporter. Six genes from Lactobacillus were cloned into the inducible lactobacillal expression vector pSIP403. Overexpression in the host strain increased its tolerance ability by 11.86–18.08%. The novel genes identified here can be used as targets to design primers for the rapid screening of bile salt-tolerant lactobacilli. Altogether, these results deepen our understanding of bile salt tolerance mechanisms in Lactobacillus and provide a basis for further rapid assessments of tolerant strains.
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Výrostková, Jana, Ivana Regecová, Mariana Kováčová, Slavomír Marcinčák, Eva Dudriková i Jana Maľová. "Antimicrobial Resistance of Lactobacillus johnsonii and Lactobacillus zeae in Raw Milk". Processes 8, nr 12 (10.12.2020): 1627. http://dx.doi.org/10.3390/pr8121627.
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Lactobacillus johnsonii and Lactobacillus zeae are among the lactobacilli with probiotic properties, which occur in sour milk products, cheeses, and to a lesser extent in raw milk. Recently, resistant strains have been detected in various species of lactobacilli. The aim of the study was to determine the incidence of resistant Lactobacillus johnsonii and Lactobacillus zeae strains in various types of raw milk. A total of 245 isolates were identified by matrix-assisted laser desorption/ionization mass spectrometry and polymerase chain reaction methods as Lactobacillus sp., of which 23 isolates of Lactobacillus johnsonii and 18 isolates of Lactobacillus zeae were confirmed. Determination of susceptibility to selected antibiotics was performed using the E-test and broth dilution method, where 7.3% of lactobacilli strains were evaluated as ampicillin-resistant, 14.7% of isolates as erythromycin-resistant, and 4.9% of isolates as clindamycin-resistant. The genus Lactobacillus johnsonii had the highest resistance to erythromycin (34.8%), similar to Lactobacillus zeae (33.3%). Of the 41 isolates, the presence of the gene was confirmed in five Lactobacillus johnsonii strains and in two strains of Lactobacillus zeae. The presence of resistant strains of Lactobacillus johnsonii and Lactobacillus zeae is a potential risk in terms of spreading antimicrobial resistance through the food chain.
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Bilkova, A., H. Kinova Sepova, M. Bukovsky i L. Bezakova. "Antibacterial potential of lactobacilli isolated from a lamb". Veterinární Medicína 56, No. 7 (11.08.2011): 319–24. http://dx.doi.org/10.17221/1583-vetmed.
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The antimicrobial properties of three potential probiotic strains of lactobacilli isolated from a lamb (Lactobacillus murinus C, Lactobacillus mucosae D and Lactobacillus reuteri E) were studied using the streak line method and the agar well diffusion assay. The probiotic lactobacilli strains Lactobacillus rhamnosus ATCC 53103, Lactobacillus reuteri ATCC 55730, Lactobacillus reuteri ATCC 55845 and Lactobacillus plantarum DSM 9843 were used for comparison. Using the streak line method the inhibitory activity of lactobacilli products towards ten Gram-positive and Gram-negative potential pathogenic bacteria under different cultivation conditions (anaeorobic or microaerobic preincubation of lactobacilli for 24 h or 48 h) was tested. The strongest inhibitory activity was demonstrated by the Lactobacillus reuteri E strain. The most sensitive strains to the antimicrobial activity of lactobacilli were Yersinia enterocolitica clinical isolate (19.9 ± 6.8 mm) and Listeria monocytogenes ATCC 51774 (17.7 ± 6.0 mm) after microaerobic and anaerobic preincubation, respectively. Generally, microaerobic conditions and longer preincubation of lactobacilli resulted in stronger inhibition of target bacteria. The inhibitory activity of lactobacilli towards selected lactobacilli strains was also tested. Only low inhibition of growth was observed. In the agar well diffusion assay the inhibitory effect of natural and modified lactobacilli culture cell-free supernatants, obtained from MRS broth cultures, on Staphylococcus aureus ATCC 6538 growth was determined. Supernatants were modified by heat (10 min/60 °C; 60 min/100 °C) and protease treatment and neutralization of pH. Neutralization elicited the most significant impact on the activity of supernatants and resulted in total loss of activity. After all other modifications supernatants retained some residual activity. The highest inhibitory activity was observed for the cell-free supernatant produced by Lactobacillus mucosae D.
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Bobcek, B., Ľ. Gajdosová, M. Kacániová, J. Lejková, L. Hleba i V. Kmeť. "Antibacterial susceptibility of lactobacilli isolated from pork meat of conventional breeding". Biotehnologija u stocarstvu 27, nr 3 (2011): 799–807. http://dx.doi.org/10.2298/bah1103799b.
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The aim of this study was monitoring of antibiotic resistance of Enterobacteriaceae genera isolated from musculus longissimus at thoracis and musculus semimembranosus of pork. The pigs was feeding in two groups (control and experimental wit selenium application). For the antibiotic susceptibility testing disk diffusion method was used. Lactobacillus species were tested against two antibiotics: ampiciline, tetracycline. For the detection and identification of lactobacilli we used MRS and Rogose agar. For identification of lactobacilli MALDI-TOF-MS were used. The higher resistance of isolated bacteria were found on ampicillin (29%) and on tetracycline (46%) in experimental group. The lower resistance of isolated bacteria were found on ampicillin (25%) and on tetracycline (35%) in control group. The most resistance bacteria of Lactobacillus genus was Lactobacillus plantarum in control and experimental group, too. From MLT and MSM pork meat Lactobacillus species Lactobacillus reuteri, L. crispatus, L.paracasei, L. farcimins and L curvatus and from non-lactobacilli Lactococcus lastis, Pediococcus pentosaceus were isolated (Table 2). The higher isolated species from lactobacilli genera was Lactobacillus paracasei in control group with 35.63 % and Lactobacillus reuteri in experimental group with 25.83%.
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Kabir, SM Lutful, SM Mushfiqur Rahman, Sucharit Basu Neogi, Mohummad Muklesur Rahman i M. Shahidur Rahman Khan. "Isolation, identification, molecular characterization and screening of probiotic activities of Lactobacillus species from poultry sources at live bird markets in Mymensingh, Bangladesh". Asian-Australasian Journal of Bioscience and Biotechnology 1, nr 1 (30.04.2016): 54–65. http://dx.doi.org/10.3329/aajbb.v1i1.61531.
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A study was conducted to isolate and characterize Lactobacilli from the gastrointestinal (GI) tract of broiler chickens in different markets along with evaluation of probiotic ability and antibiotic sensitivity of Lactobacillus isolates during the period of July, 2014 to December, 2014. The caecum and cloacal contents of 100 broiler chickens from different markets were collected and cultured on Man Rogosa and Sharp (MRS) broth and agar. Lactobacilli were isolated and characterized by using phenotypic (cell morphology, Gram’s staining, physiological and biochemical tests which are specific for Lactobacillus genus) and genotypic methods (PCR and RAPD). The identified Lactobacilli species were screened for probiotic properties by in vitro tests like acid tolerance and bile tolerance. Total eighty two isolates were identified as Lactobacillus based on morphological, physiological and biochemical tests which are specific for Lactobacillus genus. All of the Lactobacillus isolates were further identified at species level as Lactobacillus acidophilus, Lactobacillus crispatus, Lactobacillus galinarum and other unclassified Lactobacillus species based on sugar fermentation tests. The prevalence of Lactobacillus crispatus, Lactobacillus acidophilus and Lactobacillus gallinarum species found in the chickens were 21.95%, 18.29% and 17.07% respectively. A total of 10 Lactobacillus isolates were amplified by using 16S rRNA gene-based universal primers. Furthermore, out of 10 Lactobacillus isolates 4 molecular patterns were detected and 6 Lactobacillus isolates were clonal by randomly amplified ploymorphic DNA (RAPD) method in this study. Out of 15 Lactobacillus isolates, 10 isolates demonstrated probiotic ability as determined by bile tolerance test and acid tolerance test. Moreover, the results of antibiotic sensitivity showed that all of the isolates tested were sensitive to tetracycline and gentamicin. However, most of the isolates tested were resistant to ampicillin and cefradine. Potential probiotic bacterial strains from poultry sources were identified as well as characterized in this study. Asian Australas. J. Biosci. Biotechnol. 2016, 1 (1), 54-65
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Henri-Dubernet, Ségolène, Nathalie Desmasures i Micheline Guéguen. "Diversity and dynamics of lactobacilli populations during ripening of RDO Camembert cheese". Canadian Journal of Microbiology 54, nr 3 (marzec 2008): 218–28. http://dx.doi.org/10.1139/w07-137.
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The diversity and dynamics of Lactobacillus populations in traditional raw milk Camembert cheese were monitored throughout the manufacturing process in 3 dairies. Culture-dependent analysis was carried out on isolates grown on acidified de Man – Rogosa – Sharpe agar and Lactobacillus anaerobic de Man Rogosa Sharpe agar supplemented with vancomycin and bromocresol green media. The isolates were identified by polymerase chain reaction – temperature gradient gel electrophoresis (PCR–TGGE) and (or) species-specific PCR and (or) sequencing, and Lactobacillus paracasei and Lactobacillus plantarum isolates were characterized by pulsed field gel electrophoresis (PFGE). Milk and cheese were subjected to culture-independent analysis by PCR–TGGE. Presumed lactobacilli were detected by plate counts throughout the ripening process. However, molecular analysis of total DNA and DNA of isolates failed to detect Lactobacillus spp. in certain cases. The dominant species in the 3 dairies was L. paracasei. PFGE analysis revealed 21 different profiles among 39 L. paracasei isolates. Lactobacillus plantarum was the second most isolated species, but it occurred nearly exclusively in one dairy. The other species isolated were Lactobacillus parabuchneri , Lactobacillus fermentum , Lactobacillus acidophilus , Lactobacillus helveticus , a Lactobacillus psittaci/delbrueckii subsp. bulgaricus/gallinarum/crispatus group, Lactobacillus rhamnosus , Lactobacillus delbrueckii subsp. bulgaricus, L. delbrueckii subsp. lactis, Lactobacillus brevis , Lactobacillus kefiri , and Lactobacillus perolens. Lactobacilli diversity at the strain level was high. Dynamics varied among dairies, and each cheese exhibited a specific picture of species and strains.
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Dong, Jie, Yun Sheng Jiang, Hai Yu, Wen Juan Zhang i Yu Feng Liu. "Study on Lactobacillus Isolation from Rabbit Meat Sausage and its Fermentation Property". Applied Mechanics and Materials 140 (listopad 2011): 431–40. http://dx.doi.org/10.4028/www.scientific.net/amm.140.431.
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Three lactobacilli (L26, L34 , L106) isolated from naturally fermented rabbit sausage in a traditional way are identified as lactobacillus plantarum, lactobacillus sake and lactobacillus fructosus. Further study of its fermentation property shows that three lactobacilli are effective in acid production, alkali resistant, nitrite resistant and bacteriostatic, and are antagonisticaction free, which can be used as combined rabbit meat starter.
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Stojanov, Spase, Tina Vida Plavec, Julijana Kristl, Špela Zupančič i Aleš Berlec. "Engineering of Vaginal Lactobacilli to Express Fluorescent Proteins Enables the Analysis of Their Mixture in Nanofibers". International Journal of Molecular Sciences 22, nr 24 (20.12.2021): 13631. http://dx.doi.org/10.3390/ijms222413631.
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Lactobacilli are a promising natural tool against vaginal dysbiosis and infections. However, new local delivery systems and additional knowledge about their distribution and mechanism of action would contribute to the development of effective medicine. This will be facilitated by the introduction of the techniques for effective, inexpensive, and real-time tracking of these probiotics following their release. Here, we engineered three model vaginal lactobacilli (Lactobacillus crispatus ATCC 33820, Lactobacillus gasseri ATCC 33323, and Lactobacillus jensenii ATCC 25258) and a control Lactobacillus plantarum ATCC 8014 to express fluorescent proteins with different spectral properties, including infrared fluorescent protein (IRFP), green fluorescent protein (GFP), red fluorescent protein (mCherry), and blue fluorescent protein (mTagBFP2). The expression of these fluorescent proteins differed between the Lactobacillus species and enabled quantification and discrimination between lactobacilli, with the longer wavelength fluorescent proteins showing superior resolving power. Each Lactobacillus strain was labeled with an individual fluorescent protein and incorporated into poly (ethylene oxide) nanofibers using electrospinning, as confirmed by fluorescence and scanning electron microscopy. The lactobacilli retained their fluorescence in nanofibers, as well as after nanofiber dissolution. To summarize, vaginal lactobacilli were incorporated into electrospun nanofibers to provide a potential solid vaginal delivery system, and the fluorescent proteins were introduced to distinguish between them and allow their tracking in the future probiotic-delivery studies.
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Haarman, Monique, i Jan Knol. "Quantitative Real-Time PCR Analysis of Fecal Lactobacillus Species in Infants Receiving a Prebiotic Infant Formula". Applied and Environmental Microbiology 72, nr 4 (kwiecień 2006): 2359–65. http://dx.doi.org/10.1128/aem.72.4.2359-2365.2006.
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ABSTRACT The developing intestinal microbiota of breast-fed infants is considered to play an important role in the priming of the infants' mucosal and systemic immunity. Generally, Bifidobacterium and Lactobacillus predominate the microbiota of breast-fed infants. In intervention trials it has been shown that lactobacilli can exert beneficial effects on, for example, diarrhea and atopy. However, the Lactobacillus species distribution in breast-fed or formula-fed infants has not yet been determined in great detail. For accurate enumeration of different lactobacilli, duplex 5′ nuclease assays, targeted on rRNA intergenic spacer regions, were developed for Lactobacillus acidophilus, Lactobacillus casei, Lactobacillus delbrueckii, Lactobacillus fermentum, Lactobacillus paracasei, Lactobacillus plantarum, Lactobacillus reuteri, and Lactobacillus rhamnosus. The designed and validated assays were used to determine the amounts of different Lactobacillus species in fecal samples of infants receiving a standard formula (SF) or a standard formula supplemented with galacto- and fructo-oligosaccharides in a 9:1 ratio (OSF). A breast-fed group (BF) was studied in parallel as a reference. During the 6-week intervention period a significant increase was shown in total percentage of fecal lactobacilli in the BF group (0.8% ± 0.3% versus 4.1% ± 1.5%) and the OSF group (0.8% ± 0.3% versus 4.4% ± 1.4%). The Lactobacillus species distribution in the OSF group was comparable to breast-fed infants, with relatively high levels of L. acidophilus, L. paracasei, and L. casei. The SF-fed infants, on the other hand, contained more L. delbrueckii and less L. paracasei compared to breast-fed infants and OSF-fed infants. An infant milk formula containing a specific mixture of prebiotics is able to induce a microbiota that closely resembles the microbiota of BF infants.
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Ghazaei, Ciamak. "Isolation and Characterization of Lactic Acid Bacteria From Milk and Their Effects on the Pathogenic Bacteria". Research in Molecular Medicine 8, nr 4 (26.10.2020): 189–200. http://dx.doi.org/10.32598/rmm.8.4.4.
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Background: Probiotics are “live microbial cells” that are beneficial for human and animal health. Lactobacilli are such a diverse group of bacteria with similar metabolic and physiological characteristics, and constitute important and beneficial gut microflora. During carbohydrate fermentation, lactobacilli produce lactic acid as an end product in metabolism. Hence, lactobacilli have high significance to be used as probiotics in the food industry, because of their acidifying properties. Also, lactobacilli are considered “safe”, owing to their ubiquitous presence in the food. Many researchers provided evidence for the presence of lactobacilli in milk sources. Thus, the present study aimed to isolate and characterize different lactobacilli strains from milk sources and analyze their “probiotic potential”. Materials and methods: Forty-one lactobacilli isolates were obtained from raw cow milk. Then, the strains were characterized by morphological identification and biochemical tests. Besides, probiotic potentials were evaluated with the bile tolerance test, antibiotic susceptibility test, and determining suitable pH for the optimal growth of lactobacilli. The lactobacilli isolates were also analyzed for their probiotic characteristics and the release of antimicrobial substances. Their antimicrobial activities against pathogenic strains were assessed by determining the minimum inhibitory concentration, with the help of agar diffusion methods. Results: From 50 milk samples, 41 lactobacilli isolates were obtained, out of which five lactobacilli strains were identified as Lactobacillus casei, Lactobacillus plantarum, Lactobacillus brevis, Lactobacillus acidophilus, and Lactobacillus lactis. Moreover, 35 isolates showed an inhibitory effect. These strains were able to survive and grow in 0.5% to 2.5% bile salt concentrations. Lactic acid bacteria were susceptible to antibiotics, and 35 isolates obtained from raw milk showed an inhibitory effect against pathogenic bacteria. The observed minimum inhibitory concentration ranged from 50 to 100 µL and varied between the different pathogens. Conclusion: Out of 41 Lactobacillus isolates obtained from cow milk samples, 35 were identified with probiotic characteristics. Hence, this study highlighted the novel probiotic bacteria and validated the antimicrobial properties of the Lactobacillus spp against pathogenic bacteria.
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Zheng, Jinshui, Stijn Wittouck, Elisa Salvetti, Charles M. A. P. Franz, Hugh M. B. Harris, Paola Mattarelli, Paul W. O’Toole i in. "A taxonomic note on the genus Lactobacillus: Description of 23 novel genera, emended description of the genus Lactobacillus Beijerinck 1901, and union of Lactobacillaceae and Leuconostocaceae". International Journal of Systematic and Evolutionary Microbiology 70, nr 4 (1.04.2020): 2782–858. http://dx.doi.org/10.1099/ijsem.0.004107.
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The genus Lactobacillus comprises 261 species (at March 2020) that are extremely diverse at phenotypic, ecological and genotypic levels. This study evaluated the taxonomy of Lactobacillaceae and Leuconostocaceae on the basis of whole genome sequences. Parameters that were evaluated included core genome phylogeny, (conserved) pairwise average amino acid identity, clade-specific signature genes, physiological criteria and the ecology of the organisms. Based on this polyphasic approach, we propose reclassification of the genus Lactobacillus into 25 genera including the emended genus Lactobacillus , which includes host-adapted organisms that have been referred to as the Lactobacillus delbrueckii group, Paralactobacillus and 23 novel genera for which the names Holzapfelia, Amylolactobacillus, Bombilactobacillus, Companilactobacillus, Lapidilactobacillus, Agrilactobacillus, Schleiferilactobacillus, Loigolactobacilus, Lacticaseibacillus, Latilactobacillus, Dellaglioa, Liquorilactobacillus, Ligilactobacillus, Lactiplantibacillus, Furfurilactobacillus, Paucilactobacillus, Limosilactobacillus, Fructilactobacillus, Acetilactobacillus, Apilactobacillus, Levilactobacillus, Secundilactobacillus and Lentilactobacillus are proposed. We also propose to emend the description of the family Lactobacillaceae to include all genera that were previously included in families Lactobacillaceae and Leuconostocaceae . The generic term ‘lactobacilli’ will remain useful to designate all organisms that were classified as Lactobacillaceae until 2020. This reclassification reflects the phylogenetic position of the micro-organisms, and groups lactobacilli into robust clades with shared ecological and metabolic properties, as exemplified for the emended genus Lactobacillus encompassing species adapted to vertebrates (such as Lactobacillus delbrueckii , Lactobacillus iners , Lactobacillus crispatus , Lactobacillus jensensii, Lactobacillus johnsonii and Lactobacillus acidophilus ) or invertebrates (such as Lactobacillus apis and Lactobacillus bombicola ).
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Guan, Le Luo, Karen E. Hagen, Gerald W. Tannock, Doug R. Korver, Gaylene M. Fasenko i Gwen E. Allison. "Detection and Identification of Lactobacillus Species in Crops of Broilers of Different Ages by Using PCR-Denaturing Gradient Gel Electrophoresis and Amplified Ribosomal DNA Restriction Analysis". Applied and Environmental Microbiology 69, nr 11 (listopad 2003): 6750–57. http://dx.doi.org/10.1128/aem.69.11.6750-6757.2003.
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ABSTRACT The microflora of the crop was investigated throughout the broiler production period (0 to 42 days) using PCR combined with denaturing gradient gel electrophoresis (PCR-DGGE) and selective bacteriological culture of lactobacilli followed by amplified ribosomal DNA restriction analysis (ARDRA). The birds were raised under conditions similar to those used in commercial broiler production. Lactobacilli predominated and attained populations of 108 to 109 CFU per gram of crop contents. Many of the lactobacilli present in the crop (61.9% of isolates) belonged to species of the Lactobacillus acidophilus group and could not be differentiated by PCR-DGGE. A rapid and simple ARDRA method was developed to distinguish between the members of the L. acidophilus group. HaeIII-ARDRA was used for preliminary identification of isolates in the L. acidophilus group and to identify Lactobacillus reuteri and Lactobacillus salivarius. MseI-ARDRA generated unique patterns for all species of the L. acidophilus group, identifying Lactobacillus crispatus, Lactobacillus johnsonii, and Lactobacillus gallinarum among crop isolates. The results of our study provide comprehensive knowledge of the Lactobacillus microflora in the crops of birds of different ages using nucleic acid-based methods of detection and identification based on current taxonomic criteria.
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Horáčková, Š., P. Sedláčková, M. Sluková i M. Plocková. "The influence of whey, whey component and malt on the growth and acids production of lactobacilli in milk". Czech Journal of Food Sciences 32, No. 6 (27.11.2014): 526–31. http://dx.doi.org/10.17221/214/2014-cjfs.
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The effect of whey powder, whey protein concentrate, caseinomacropeptide, and malt addition into milk on the growth and acid production of lactobacilli (Lactobacillus casei Lafti L-26, Lactobacillus acidophilus CCDM 151, and Lactobacillus casei CCDM 198) was evaluated. The ability of these strains to use different types of saccharides from milk and plant sources was also tested. Glucose, galactose, fructose and maltose were utilised by all tested strains. The results showed that the addition of malt positively affected the growth of lactobacilli strains compared to the growth in milk enriched by whey ingredients. The addition of malt increased significantly the production of d(–)isomer of lactic acid by Lactobacillus acidophilus CCDM 151 and Lactobacillus casei CCDM 198 and the production of acetic acid by Lactobacillus casei CCDM 198.
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MURAD, H. A., R. I. REFAEA i E. M. ALY. "Utilization of UF-Permeate for Production of β-galactosidase by Lactic Acid Bacteria". Polish Journal of Microbiology 60, nr 2 (2011): 139–44. http://dx.doi.org/10.33073/pjm-2011-019.
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Four lactobacilli strains (Lactobacillus bulgaricus, Lactobacillus acidophilus, Lactobacilus casei and Lactobacillus reuteri) were grown in MRS broth and three lactococci strains (Streptococcus thermophilus, Lactococcus lactis subsp. Lactis and Lactococcus lactis subsp. lactis biovar. diacetilactis) were grown in M17 broth. L. reuteri and S. thermophilus were chosen on the basis of the best mean beta-galactosidase activity of 10.44 and 10.01 U/ml respectively, for further studies on permeate-based medium. The maximum production of beta-galactosidase by L. reuteri was achieved at lactose concentration of 6%, initial pH 5.0-7.5, ammonium phosphate as nitrogen source at a concentration of 0.66 g N/L and incubation temperature at 30 degrees C/24 hrs to give 6.31 U/ml. While in case of S. thermophilus, maximum beta-galactosidase production was achieved at 10% lactose concentration of permeate medium, supplemented with phosphate buffer ratio of 0.5:0.5 (KH2PO4:K2HPO4, g/L), at initial pH 6.0-6.5, ammonium phosphate (0.66g N/L) as nitrogen source and incubation temperature 35 degrees C for 24 hrs to give 7.85 U/ml.
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Balogun, S. A., Ogunbanwo, S.T. i Oni, F. F. "Screening for Biosurfactant Production from Lactic Acid Bacteria isolated from African fermented milk ‘Wara’". UMYU Journal of Microbiology Research (UJMR) 2, nr 1 (30.06.2017): 36–41. http://dx.doi.org/10.47430/ujmr.1721.006.
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Lactic Acid Bacteria (LAB) from ‘wara’ an African fermented milk (cheese)was screened for the production of surface-active agent (biosurfactant) from five species of Lactobacillus. Lactobacillus plantarum, Lactobacillus fermentum, Lactobacillus brevis, Lactobacillus casei, and Lactococcus lactis using red blood cell haemolysis test, emulsification index and oil spreading assay. Lactobacillus fermentum and Lactobacilli brevis showed the largest zone of heamolysis when screened on blood agar. The highest emulsification index of 20% was by Lactobacillus plantarum while the least emulsification index of 11% was recorded for Lactobacillus casei. All the isolates showed surface activity after being grown in 2%, 4% and 8% glucose and lactose respectively.
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Amirkhanova, Zhanerke, Saule Akhmetova, Samat Kozhakhmetov, Almagul Kushugulova, Rakhat Bodeeva, Zauresh Issina i Marat Tusbayev. "Screening of Antimicrobial and Adhesive Activity of Lactobacilli Isolated from the National Food Products from Different Districts of the Karaganda Region (Kazakhstan)". Open Access Macedonian Journal of Medical Sciences 9, A (24.09.2021): 827–32. http://dx.doi.org/10.3889/oamjms.2021.7053.
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BACKGROUND: It is a national priority to look for new probiotic bacteria with highly active biological properties to create a new generation of probiotics, ferments, therapeutic, and prophylactic fermented milk products, taking into account ethnocultural and regional characteristics. AIM: The aim of the study is to assess probiotic properties of strains of lactobacilli (antimicrobial and adhesive), which are isolated from national lactic acid products from different districts of the Karaganda region (Kazakhstan). MATERIALS AND METHODS: There were modern microbiological methods applied during the experiment. To determine the morpho-cultural properties, the following methods were used: Gram staining, a catalase test, serial dilutions. The Matrix Supported Laser Desorption/Ionization Flight Time Mass Spectrometry was used for identification, and the deferred-antagonism method was used to determine the antimicrobial activity. The buccal epithelial cells were used for the cell object as a test system to determine the adhesive activity. RESULTS: In this experiment, 26 lactobacillus isolates were isolated from 68 samples of national lactic acid products produced in a traditional homemade way in different districts of the Karaganda region (Kazakhstan). As a result of the studies carried out on the cultural and morphological characteristics and identification by the mass spectrometer, the following lactobacilli were obtained: Lactobacillus acidophilus (two strains), Lactobacillus delbrueckii subsp. bulgaricum (two strains), Lactobacillus rhamnosus (seven strains), Lactobacillus plantarum (two strains), Lactobacillus paracasei (11 strains), and Lactobacillus fermentum (two strains). Twenty-six isolates of lactobacilli were tested for antimicrobial activity, 13 isolates of which showed an inhibitory effect, but the degree of antagonism varied among lactobacillus isolates. In general, the inhibitory activity of lactobacillus isolates was shown against the Gram-negative indicator microorganisms Salmonella typhimurium NCTC 12023, Escherichia coli NCTC 12923. The antibacterial activity was shown against the Staphylococcus aureus NCTC 12973 indicator microorganism in nine isolates of lactobacilli. Only six isolates of lactobacilli showed antifungal activity against the test strain of Candida albicans NCPF 3179. Out of 13 isolates of lactobacilli, nine isolates of medium and high activity competed for binding to buccal epithelial cells. CONCLUSION: The obtained isolates from traditional dairy products are considered to be promising candidates and competitive isolates with some probiotic potential. This study calls for further researches to be made in this area.
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Strashnova, I. V., G. V. Yamborko i N. Yu Vasylieva. "ANTAGONISTIC ACTIVITY OF LACTOBACILLI PROBIOTIC STRAINS IN CO-CULTIVATION". Microbiology&Biotechnology, nr 1(54) (18.04.2022): 45–57. http://dx.doi.org/10.18524/2307-4663.2022.1(54).254024.
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SummaryAim. To investigate the antagonistic properties of multistrain compositions and consortia created on the basis of probiotic strains of bacteria of the genus Lactobacillus. Methods. A biocompatibility was investigated by co-cultivation of lactobacilli strains on MRS-agar medium. To create the compositions used separately grown daily broth cultures in certain proportions, to create consortia - strains of lactobacilli in the appropriate proportions were cultivated together in MRS broth during 24 h. The antagonistic activity of the created combinations against 10 test cultures was determined by the well-diffusion method. Results. According to the results of biocompatibility studies, strains of Lactobacillus spp. 175, M2 and M3 were selected. These strains were basis for creation 7 compositions and 7 consortia with certain ratios of broth cultures of these strains. Lactobacilli in the compositions show slightly better antimicrobial properties compared to consortia. The composition of Lactobacillus sp. M2 + Lactobacillus sp. M3 + Lactobacillus sp. 175 in a ratio of 1: 2: 2 showed the best antagonistic activity against all test strains of microorganisms. Conclusions. Created on the basis of probiotic strains of Lactobacillus spp. 175, M2 and M3 compositions and consortia are strong antagonists of different test cultures. Manifestation of activity depends on the method of combining strains in combination, the best effect is achieved by growing each strain separately with subsequent mixing of broth cultures. The most antagonistically active is a composition based on broth cultures of Lactobacillus sp. M2 + Lactobacillus sp. M3 + Lactobacillus sp. 175 in a ratio of 1: 2: 2.
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DRAKE, MARYANNE, CHRISTOPHER L. SMALL, KEMET D. SPENCE i BARRY G. SWANSON. "Rapid Detection and Identification of Lactobacillus spp. in Dairy Products by Using the Polymerase Chain Reaction". Journal of Food Protection 59, nr 10 (1.10.1996): 1031–36. http://dx.doi.org/10.4315/0362-028x-59.10.1031.
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Species-specific primers for use in the polymerase chain reaction (PCR) were designed to differentially amplify DNA from the common dairy lactobacillus species Lactobacillus casei, Lactobacillus delbrueckii, Lactobacillus helveticus, and Lactobacillus acidophilus. A method for rapid extraction of bacterial DNA from dairy products was developed. The sensitivity of bacterial DNA extraction from food and subsequent amplification by PCR was 100 cells total. Lactobacillus DNA was extracted and identified from commercial yoghurts, acidophilus milk, and cheeses. The methodology allows the presumptive identification of dairy lactobacilli in less than 6 hours.
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Calonghi, N., C. Parolin, G. Sartor, L. Verardi, B. Giordani, G. Frisco, A. Marangoni i B. Vitali. "Interaction of vaginal Lactobacillus strains with HeLa cells plasma membrane". Beneficial Microbes 8, nr 4 (24.08.2017): 625–33. http://dx.doi.org/10.3920/bm2016.0212.
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Vaginal lactobacilli offer protection against recurrent urinary and vaginal infections. The precise mechanisms underlying the interaction between lactobacilli and the host epithelium remain poorly understood at the molecular level. Deciphering such events can provide valuable information on the mode of action of commensal and probiotic bacteria in the vaginal environment. We investigated the effects exerted by five Lactobacillus strains of vaginal origin (Lactobacillus crispatus BC1 and BC2, Lactobacillus gasseri BC9 and BC11 and Lactobacillus vaginalis BC15) on the physical properties of the plasma membrane in a cervical cell line (HeLa). The interaction of the vaginal lactobacilli with the cervical cells determined two kinds of effects on plasma membrane: (1) modification of the membrane polar lipid organisation and the physical properties (L. crispatus BC1 and L. gasseri BC9); (2) modification of α5β1 integrin organisation (L. crispatus BC2, L. gasseri BC11 and L. vaginalis BC15). These two mechanisms can be at the basis of the protective role of lactobacilli against Candida albicans adhesion. Upon stimulation with all Lactobacillus strains, we observed a reduction of the basal oxidative stress in HeLa cells that could be related to modifications in physical properties and organisation of the plasma membrane. These results confirm the strictly strain-specific peculiarities of Lactobacillus and deepen the understanding of the mechanisms underlying the health-promoting role of this genus within the vaginal ecosystem.
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Lapirattanakul, Jinthana, Ryota Nomura, Rena Okawa, Setsuyo Morimoto, Pornpen Tantivitayakul, Thaniya Maudcheingka, Kazuhiko Nakano i Michiyo Matsumoto-Nakano. "Oral Lactobacilli Related to Caries Status of Children with Primary Dentition". Caries Research 54, nr 2 (2020): 194–204. http://dx.doi.org/10.1159/000506468.
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Oral lactobacilli are members of a group of bacteria implicated in caries progression, although information regarding their transmission, colonization, and caries-associated species is not well established. This study isolated oral lactobacilli from a group of children with primary dentition for determination of Lactobacillus prevalence, detection of Streptococcus mutans, a major pathogen of caries initiation, and dental caries status of the children. Species of Lactobacillus isolates were determined from examination of 16S rDNA sequences. Subsequently, the most prevalent species was evaluated for involvement in caries status, and binding ability to type I collagen of all Lactobacillus isolates was determined in association with caries status. Multilocus sequence typing (MLST) of eleven loci was carried out to study strains of the predominant Lactobacillus sp. The detection of oral lactobacilli together with S. mutans was significantly associated with the highest dental caries indices, but there was no involvement of collagen-binding properties of Lactobacillus isolates in caries status. Lactobacillus fermentum was the most prevalent, and its presence was related to high scores of caries indices. MLST analysis of L. fermentum population could not specify a particular clone associated with caries status, but revealed sharing of identical L. fermentum strains among children in the same classrooms. Taken together, the data contributed useful information on the role of oral lactobacilli, in particular L. fermentum in dental caries.
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Matsuguchi, Tetsuya, Akimitsu Takagi, Takeshi Matsuzaki, Masato Nagaoka, Kimika Ishikawa, Teruo Yokokura i Yasunobu Yoshikai. "Lipoteichoic Acids from Lactobacillus Strains Elicit Strong Tumor Necrosis Factor Alpha-Inducing Activities in Macrophages through Toll-Like Receptor 2". Clinical Diagnostic Laboratory Immunology 10, nr 2 (marzec 2003): 259–66. http://dx.doi.org/10.1128/cdli.10.2.259-266.2003.
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ABSTRACT Lactobacilli are nonpathogenic gram-positive inhabitants of microflora. At least some Lactobacillus strains have been postulated to have health beneficial effects, such as the stimulation of the immune system. Here we examined the stimulatory effects of lactobacilli on mouse immune cells. All six heat-killed Lactobacillus strains examined induced the secretion of tumor necrosis factor alpha (TNF-α) from mouse splenic mononuclear cells, albeit to various degrees. When fractionated subcellular fractions of Lactobacillus casei were tested for NF-κB activation and TNF-α production in RAW264.7, a mouse macrophage cell line, the activity was found to be as follows: protoplast > cell wall ≫ polysaccharide-peptidoglycan complex. Both crude extracts and purified lipoteichoic acids (LTAs) from two Lactobacillus strains, L. casei and L. fermentum, significantly induced TNF-α secretion from RAW264.7 cells and splenocytes of C57BL/6, C3H/HeN, and C3H/HeJ mice but not from splenocytes of C57BL/6 TLR2 −/− mice. Lactobacillus LTA induced activation of c-Jun N-terminal kinase activation in RAW264.7 cells. Furthermore, in HEK293T cells transected with a combination of CD14 and Toll-like receptor 2 (TLR2), NF-κB was activated in response to Lactobacillus LTA. Taken together, these data suggest that LTAs from lactobacilli elicit proinflammatory activities through TLR2.
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Karlsson, M., i J. Jass. "Lactobacilli differently regulate expression and secretion of CXCL8 in urothelial cells". Beneficial Microbes 3, nr 3 (1.09.2012): 195–203. http://dx.doi.org/10.3920/bm2012.0011.
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Modulation of the immune response is an established feature of certain lactobacilli. CXCL8 is an inflammatory chemokine released by the urinary tract mucosa after contact with uropathogenic Escherichia coli during urinary tract infection and is crucial for proper infiltration of immune cells. Nevertheless, persistently high levels of CXCL8 are associated with pathogenicity and malignancy. In this study, we tested twelve Lactobacillus strains for their ability to influence CXCL8 release from urothelial cells. We evaluated how strains from different Lactobacillus species could regulate CXCL8 in human 5637 urothelial cells, either resting cells or cells concomitantly challenged with heat-killed E. coli. A majority of the tested species altered CXCL8 release from the urothelial cells after 24 hours of stimulation. Most species increased CXCL8 release, whereas a few lactobacilli efficiently suppressed CXCL8 secretion from E. coli-challenged cells. While strong CXCL8 modulators such as Lactobacillus reuteri and Lactobacillus delbrueckii were unable to degrade CXCL8 in the extracellular environment, effects on IL8 transcription were evident for selected lactobacilli. Although IL8 transcription was affected by lactobacilli, the influence on mRNA transcript did not correlate to the impact on CXCL8 release. Phylogenetic analysis based on a 16S rRNA dendrogram of the tested lactobacilli and their effect on CXCL8 revealed some linkage to specific Lactobacillus groups. Testing the immunomodulatory nature of lactobacilli can prove important when selecting new probiotic microbes. Moreover, we believe that phylogenetic and phenotypic similarities could be used to analyse the traits governing such modulation.
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Farahmand, Nasim, Labia I. I. Ouoba, Shahram Naghizadeh Raeisi, Jane Sutherland i Hamid B. Ghoddusi. "Probiotic Lactobacilli in Fermented Dairy Products: Selective Detection, Enumeration and Identification Scheme". Microorganisms 9, nr 8 (27.07.2021): 1600. http://dx.doi.org/10.3390/microorganisms9081600.
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A selection of 36 commercial probiotic fermented dairy products from UK and Europe markets were evaluated for the numbers, types, and viability of Lactobacillus strains against the stated information on their packages. A comparative study was carried out on selectivity of MRS-Clindamycin, MRS-Sorbitol, and MRS-IM Maltose, to select the right medium for enumeration of probiotic Lactobacillus. Based on selectivity of medium for recovery of the targeted lactobacilli, and also simplicity of preparation, MRS-Clindamycin was chosen as the best medium for enumeration of probiotic Lactobacillus in fermented milks. The results of enumeration of lactobacilli showed that 22 out of a total 36 tested products contained more than 106 colony-forming units/g at the end of their shelf life, which comply with the recommended minimum therapeutic level for probiotics. Rep-PCR using primer GTG-5 was applied for initial discrimination of isolated strains, and isolates, which presented different band profile, were placed in different groups. The isolated Lactobacillus spp. were identified mainly as Lactobacillus acidophilus, Lactobacillus casei, and Lactobacillus paracasei by analysis of partial sequences of the 16S ribosomal RNA and rpoA genes.
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CHANG, M. H., i T. C. CHEN. "Reduction of Campylobacter jejuni in a Simulated Chicken Digestive Tract by Lactobacilli Cultures". Journal of Food Protection 63, nr 11 (1.11.2000): 1594–97. http://dx.doi.org/10.4315/0362-028x-63.11.1594.
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Studies were conducted to investigate the impact of a selected lactobacilli mixed culture on Campylobacter jejuni in simulated chicken digestive tract models. Veronal buffer solutions corresponding to the pH of successive segments of the chicken digestive tract were prepared. The lactobacilli mixtures were prepared by mixing four fresh lactobacilli cultures, including Lactobacillus acidophilus, Lactobacillus fermentum, Lactobacillus crispatus, and Lactobacillus brevis. The C. jejuni and lactobacilli mixture were mixed with sterile poultry feed, and the previously prepared veronal buffer solutions were then added separately. The mixture was incubated at 41.1°C for various lengths of time with periodic agitation. The feed passage time for five segments of the digestive tract were adopted: crop (pH 4.5), 30 min; proventriculus (pH 4.4), 15 min; gizzard (pH 2.6), 90 min; small intestine (pH 6.2), 90 min; and large intestine (pH 6.3), 15 min. The Campylobacter and lactobacilli were enumerated. An antagonistic effect on C. jejuni by the tested lactobacilli spp. was found in individual sections and the complete simulated digestive tract models. In the simulated complete chicken digestion system, no C. jejuni were found during the final incubation period when a lactobacilli mixture was present. The results of this in vitro study indicate the potential value of future in vivo studies.
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Azeem, Nimra, Muhammad Nawaz, Aftab Ahmad Anjum, Shagufta Saeed, Saba Sana, Amina Mustafa i Muhammad Rizwan Yousuf. "Activity and Anti-Aflatoxigenic Effect of Indigenously Characterized Probiotic Lactobacilli against Aspergillus flavus—A Common Poultry Feed Contaminant". Animals 9, nr 4 (15.04.2019): 166. http://dx.doi.org/10.3390/ani9040166.
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Aflatoxin contamination in human food and animal feed is a threat to public safety. Aflatoxin B1 (AFB1) can be especially damaging to poultry production and consequently economic development of Pakistan. The present study assessed the in vitro binding of AFB1 by indigenously characterized probiotic lactobacilli. Six isolates (Lactobacillus gallinarum PDP 10, Lactobacillus reuetri FYP 38, Lactobacillus fermentum PDP 24, Lactobacillus gallinarum PL 53, Lactobacillus paracasei PL 120, and Lactobacillus gallinarum PL 149) were tested for activity against toxigenic Aspergillus flavus W-7.1 (AFB1 producer) by well diffusion assay. Only three isolates (PL 53, PL 120, and PL 149) had activity against A. flavus W-7.1. The ameliorative effect of these probiotic isolates on AFB1 production was determined by co-culturing fungus with lactobacilli for 12 days, followed by aflatoxin quantification by high-performance liquid chromatography. In vitro AFB1 binding capacities of lactobacilli were determined by their incubation with a standard amount of AFB1 in phosphate buffer saline at 37 °C for 2 h. AFB1 binding capacities of isolates ranged from 28–65%. Four isolates (PDP 10, PDP 24, PL 120, and PL 149) also ceased aflatoxin production completely, whereas PL 53 showed 55% reduction in AFB1 production as compared to control. The present study demonstrated Lactobacillus gallinarum PL 149 to be an effective candidate AFB1 binding agent against Aspergillus flavus. These findings further support the binding ability of lactic acid bacteria for dietary contaminants.
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St. Amant, Diane C., Iris E. Valentin-Bon i Ann E. Jerse. "Inhibition of Neisseria gonorrhoeae by Lactobacillus Species That Are Commonly Isolated from the Female Genital Tract". Infection and Immunity 70, nr 12 (grudzień 2002): 7169–71. http://dx.doi.org/10.1128/iai.70.12.7169-7171.2002.
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ABSTRACT Epidemiological studies suggest H2O2-producing lactobacilli protect women against gonorrhea. Here we demonstrate that Lactobacillus crispatus and Lactobacillus jensenii, the most common lactobacilli in the female genital tract, inhibit gonococci in both acidic and neutral pH conditions. Inhibition was neutralized by bovine catalase, suggesting that H2O2 is the primary mediator of inhibition.
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Harina, E. I., U. A. Malakhova, O. S. Butrimova i D. N. Chernov. "The comparative analysis of traditional and modernized nutrient media for the cultivation of lactobacilli". Sovremennaya nauka i innovatsii, nr 4 (44) (2023): 89–95. http://dx.doi.org/10.37493/2307-910x.2023.4.10.
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Culture media for lactobacilli cultivation are used for their growth and reproduction in laboratory conditions, as well as in the production of dairy products. The composition of the developed nutrient medium includes: skimmed milk, yeast extract, lactose, lactulose, agar-agar, distilled water. This complex of components provides lactobacilli with essential nutrients, including carbohydrates, proteins, vitamins and minerals. The constituent components of the nutrient medium are affordable and cheap to purchase. The work involved the cultivation of various types of lactobacilli. (Lactobacillus acidophilus, Lactococcus lactis, Lactobacillus bulgaricus; Lactobacillus casei) on various nutrient media (MRS, Milk agar with prebiotics). It follows from the results of the experiments that the growth rate of lactobacilli on the nutrient medium "Milk agar with prebiotics" is higher in comparison with analogues of industrial production. The greatest intensity of probiotic growth is observed in yogurt starter culture, which includes probiotics of the following species: Lactococcus lactis; Lactobacillus bulgaricus; Lactobacillus casei, grown on the nutrient medium "Milk agar with probiotics", it is 3.7 * 109 CFU/ gr. The high economic efficiency of the developed nutrient medium in comparison with foreign analogues has been confirmedA formulation of a production nutrient medium necessary for the cultivation of probiotic microorganisms has been developed. It has been established that the growth rate of various lactobacilli on this medium is higher in comparison with analogues of industrial production. The high economic efficiency of the developed nutrient medium has been confirmed in comparison with foreign analogues
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Pramanick, Rinku, Shraddha Parab, Niranjan Mayadeo, Himangi Warke i Clara Aranha. "Cross sectional analysis of vaginal Lactobacillus in asymptomatic women of reproductive age in Mumbai, India". Journal of Infection in Developing Countries 12, nr 12 (31.12.2018): 1096–104. http://dx.doi.org/10.3855/jidc.10154.
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Introduction: Lactobacillus dominated vaginal microenvironment is associated with lower risk of genital infections. Numerous studies have reported geographic and ethnic variations in vaginal microbiome structure between healthy individuals from different race and ethnicity. India has a great diversity, so it is intriguing to find out if such divergences exist in vaginal lactobacilli. The present study aimed to investigate predominant Lactobacillus species in vaginas of healthy Indian women and screen isolates for lactic acid and H2O2 production.
Methodology: 203 premenopausal women asymptomatic for any vaginal complaints were recruited. The lactobacilli isolates on MRS agar were identified by Multiplex-PCR and 16sRNA gene sequencing. RAPD was used to differentiate strains of same species. H2O2 and lactic acid was evaluated on TMB-HRP MRS agar and BCP-MRS agar respectively.
Results: Lactobacilli were recovered from 107/109 (98.2%) women with normal microflora. L. iners 64.7% (68), L. crispatus 26.7% (28), L. reuteri 21.9% (23), L. jensenii 16.2% (17) and L. gasseri 15.2% (16) were the most frequently occurring vaginal lactobacilli in normal women. The vaginal microflora was dominated by either by a single (80%, n = 84) or a combination (20%, n = 21) of Lactobacillus species. Though most frequently identified, L. iners, coexisted only with other Lactobacillus species. All isolates were acid producers but H2O2 was produced by 94.2% isolates.
Conclusions: Our study reports prevalent vaginal lactobacilli which could be explored as probiotics. Presence of heterogeneous Lactobacillus population highlights the cumulative effects of different lactobacilli maintaining vaginal health. Contrasting observations about L. iners reiterates its puzzling role in vaginal immunity, advocating further research.
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Szydłowska, Aleksandra, i Dorota Zielińska. "Wpływ dodatku przyprawy z suszonej kory cynamonowca na przeżywalność potencjalnie probiotycznych szczepów bakterii w musach dyniowo-jabłkowych i ich jakość sensoryczną". Zywnosc Nauka Technologia Jakosc/Food Science Technology Quality 113, nr 4 (2017): 48–58. http://dx.doi.org/10.15193/zntj/2017/113/210.
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Celem pracy było określenie wpływu dodatku cynamonu na przeżywalność dwóch potencjalnie probiotycznych szczepów bakterii: Lactobacillis rhamnosus K3, Lactobacillus brevis O24 oraz na jakość sensoryczną probiotycznych musów dyniowo-jabłkowych, przechowywanych w temp. 5 ºC przez 21 dni. Zakres pracy obejmował produkcję probiotycznych musów dyniowo-jabłkowych w warunkach laboratoryjnych, oznaczenie liczby bakterii dwóch wymienionych szczepów, pomiar wartości pH oraz ocenę jakości sensorycznej produktów. Na podstawie przeprowadzonych badań stwierdzono istotny wpływ czasu przechowywania na liczbę bakterii Lactobacillis rhamnosus K3 i Lactobacillus brevis O24 w musach jabłkowo-dyniowych bez względu na poziom dodawanego cynamonu. Po upływie 7 dni przechowywania produktów w temp. 5 ºC odnotowano statystycznie istotne zwiększenie liczby bakterii we wszystkich produktach z wyjątkiem musu zawierającego szczep bakterii Lactobacillis rhamnosus K3 i dodatek przyprawy na poziomie 3 % przy jednoczesnym obniżeniu wartości pH. Liczba bakterii potencjalnie probiotycznych szczepów Lactobacillis rhamnosus K3 oraz Lactobacillus brevis O24 utrzymywała się na wysokim poziomie, tj. powyżej 7 log jtk/g produktu przez cały okres chłodniczego przechowywania musów dyniowo-jabłkowych. Dodatek sproszkowanego cynamonu na poziomie 6 %, wpływał na nieznaczne obniżenie ogólnej jakości sensorycznej musów. W produktach tych zaobserwowano wyższą intensywność odczucia smaku i zapachu innego, określanego jako „cynamonowy”. Przez cały okres przechowywania produkty charakteryzowały się wysoką jakością sensoryczną (średnia ogólna jakość sensoryczna wynosiła powyżej 6,3 j.u). Szczepy potencjalnie probiotycznych bakterii Lactobacillis rhamnosus K3 i Lactobacillus brevis O24 mogą być wykorzystywane do produkcji musów dyniowo-jabłkowych o akceptowanej jakości sensorycznej i odpowiedniej liczbie komórek bakterii warunkujących właściwości probiotyczne produktu finalnego.
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Trivedi, Disha, Prasant Kumar Jena i Sriram Seshadri. "Colicin E2 Expression in Lactobacillus brevis DT24, A Vaginal Probiotic Isolate, against Uropathogenic Escherichia coli". ISRN Urology 2014 (4.02.2014): 1–7. http://dx.doi.org/10.1155/2014/869610.
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Novel therapeutic approaches are needed to combat the urinary tract infection in women. During menstruation elevated protein concentration and increase in oxygen and carbon dioxide concentrations with decrease in vaginal Lactobacilli all together contribute to urinary tract infections. Lactobacillus species are a predominant member of the vaginal microflora and are critical in the prevention of a number of urogenital diseases. In order to increase antimicrobial potential of vaginal Lactobacilli, bacteriocin colicin E2 which has specific activity against uropathogenic Escherichia coli has been overexpressed in vaginal probiotic Lactobacillus brevis DT24. Recombinant Lactobacillus brevis DT24 expressing colicin E2 showed much higher inhibitory activity against uropathogenic Escherichia coli than wild type L. brevis DT24 in vitro. Efficacy of probiotic Lactobacillus brevis DT24 expressing colicin E2 protein is required for further in vivo evaluation.
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Settanni, Luca, Sara Valmorri, Douwe van Sinderen, Giovanna Suzzi, Antonello Paparella i Aldo Corsetti. "Combination of Multiplex PCR and PCR-Denaturing Gradient Gel Electrophoresis for Monitoring Common Sourdough-Associated Lactobacillus Species". Applied and Environmental Microbiology 72, nr 5 (maj 2006): 3793–96. http://dx.doi.org/10.1128/aem.72.5.3793-3796.2006.
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ABSTRACT A combination of denaturing gradient gel electrophoresis (DGGE) and a previously described multiplex PCR approach was employed to detect sourdough lactobacilli. Primers specific for certain groups of Lactobacillus spp. were used to amplify fragments, which were analyzed by DGGE. DGGE profiles obtained from Lactobacillus type strains acted as standards to analyze lactobacilli from four regional Abruzzo (central Italy) sourdoughs.
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Beekwilder, Jules, Daniela Marcozzi, Samuele Vecchi, Ric de Vos, Patrick Janssen, Christof Francke, Johan van Hylckama Vlieg i Robert D. Hall. "Characterization of Rhamnosidases from Lactobacillus plantarum and Lactobacillus acidophilus". Applied and Environmental Microbiology 75, nr 11 (3.04.2009): 3447–54. http://dx.doi.org/10.1128/aem.02675-08.
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ABSTRACT Lactobacilli are known to use plant materials as a food source. Many such materials are rich in rhamnose-containing polyphenols, and thus it can be anticipated that lactobacilli will contain rhamnosidases. Therefore, genome sequences of food-grade lactobacilli were screened for putative rhamnosidases. In the genome of Lactobacillus plantarum, two putative rhamnosidase genes (ram1 Lp and ram2 Lp) were identified, while in Lactobacillus acidophilus, one rhamnosidase gene was found (ramA La). Gene products from all three genes were produced after introduction into Escherichia coli and were then tested for their enzymatic properties. Ram1Lp, Ram2Lp, and RamALa were able to efficiently hydrolyze rutin and other rutinosides, while RamALa was, in addition, able to cleave naringin, a neohesperidoside. Subsequently, the potential application of Lactobacillus rhamnosidases in food processing was investigated using a single matrix, tomato pulp. Recombinant Ram1Lp and RamALa enzymes were shown to remove the rhamnose from rutinosides in this material, but efficient conversion required adjustment of the tomato pulp to pH 6. The potential of Ram1Lp for fermentation of plant flavonoids was further investigated by expression in the food-grade bacterium Lactococcus lactis. This system was used for fermentation of tomato pulp, with the aim of improving the bioavailability of flavonoids in processed tomato products. While import of flavonoids into L. lactis appeared to be a limiting factor, rhamnose removal was confirmed, indicating that rhamnosidase-producing bacteria may find commercial application, depending on the technological properties of the strains and enzymes.
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Mounia, Homrani, Dalache Fatiha, Bouzouina Mohammed, Nemmiche Said i Homrani AbdelKader. "Antibacterial activity of Lactobacilli detected in Algerian raw honeys against gram-negative bacteria". South Asian Journal of Experimental Biology 8, nr 3 (10.03.2019): 83–90. http://dx.doi.org/10.38150/sajeb.8(3).p83-90.
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This study reports the isola on of Lactobacilli from Four (n=04) typical Apis Mellifeca raw honey samples collected from different regions in Algeria and the evalua on of their an bacterial ac vi es against Gram-negative bacteria. The isolation of Lactobacilli was performed using different media. Isolates were identified firrstly by catalase test, Gram staining and cells morphology, and confirmed by MALDI-TOF-MS. An bacterial activities of Bacterial cultures of selected Lactobacilli and their cell free supernatants were tested by agar spot assays and agar well diffusion assay. A total of eighteen (n=18) bacteria isolated from honey samples were presump vely iden ed as Lac- tobacillus spp. based on their posi ve Gram reactions, absence of catalase and their rod shape. MALDI-TOF MS iden ca on confirmed that all isolates were classified as Lactobacillus genus, but the results for their species were inconclusive with uncertainty between, Lactobacillus pentosus, Lactobacillus plantarum and Lactobacillus paraplantarum. Isolates exhibited an microbial activity with inhibition zone diameters ranging from 11 ± 1.41 mm to 17.5 ± 0.71 mm. 6 on 11 Lactobacilli Supernatants demonstrated inhibitory ac vity against all target bacteria. This study reveals the existence of Lactobacilli in Algerian raw Honeys. These Lactobacilli possess an bacterial properties against Gram-negative bacteria, often responsible of human infections, and can be a favorable substitute to antibiotics.
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KIECKA, ANETA, BARBARA MACURA i MARIAN SZCZEPANIK. "Can Lactobacillus spp. Be a Factor Reducing the Risk of Miscarriage?" Polish Journal of Microbiology 70, nr 4 (1.12.2021): 431–46. http://dx.doi.org/10.33073/pjm-2021-043.
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Abstract Pregnancy loss is a common obstetric problem. Significant causes of miscarriage include genetic and epigenetic disorders of the embryo, immunological and endocrine factors, uterine malformations, improper embryo selection, and lifestyle. Perhaps a hitherto underappreciated cause of miscarriage may be an abnormal microbiota composition of the female reproductive system. Lactobacillus spp. is the most common bacteria within the reproductive tract. However, the protective role of Lactobacilli in the vagina has been well described in the literature, while it is still unknown what function Lactobacilli may have in the uterus. Moreover, new research shows that Lactobacillus spp. can have a role in miscarriage. However, both molecular and immunological mechanisms of host-Lactobacillus spp. interactions are not fully understood. Understanding these relationships will help address the importance and extent of the protective role of Lactobacillus spp. in miscarriage.
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Journal, Baghdad Science. "Effect of Lactobacilli sources on Escherichia coli and Staphylococcus aureus adherence to uroepithelial cells". Baghdad Science Journal 8, nr 3 (4.09.2011): 723–27. http://dx.doi.org/10.21123/bsj.8.3.723-727.
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The inhibitory action of four lactobacilli isolates Lactobacillus bulgaricus, L. acidophilus, L. plantarum and L. fermentum, isolated from four different samples; yoghurt, vinegar, saliva and vagina respectively, on Escherichia coli and Staphylococcus aureus adhesion to uroepithelial cells were investigated. Results showed that all Lactobacillus isolates or their supernatant were able to reduce the number of the uropathogens attached to uroepithelial cells. However, inhibition level of lactobacilli cells was higher than their supernatant. Nevertheless, the human indigenous lactobacilli (L. fermentum and L. plantarum) were more competitive than food lactobacilli (L. acidophilus and L. bulgaricus).
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Al-Mathkhury, Harith J. F., i Alaa' Mohammed Hasan. "Effect of Lactobacilli sources on Escherichia coli and Staphylococcus aureus adherence to uroepithelial cells". Baghdad Science Journal 8, nr 3 (4.09.2011): 723–27. http://dx.doi.org/10.21123/bsj.2011.8.3.723-727.
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The inhibitory action of four lactobacilli isolates Lactobacillus bulgaricus, L. acidophilus, L. plantarum and L. fermentum, isolated from four different samples; yoghurt, vinegar, saliva and vagina respectively, on Escherichia coli and Staphylococcus aureus adhesion to uroepithelial cells were investigated. Results showed that all Lactobacillus isolates or their supernatant were able to reduce the number of the uropathogens attached to uroepithelial cells. However, inhibition level of lactobacilli cells was higher than their supernatant. Nevertheless, the human indigenous lactobacilli (L. fermentum and L. plantarum) were more competitive than food lactobacilli (L. acidophilus and L. bulgaricus).
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Ahmed, Monzur Morshed, Md Mizanur Rahaman, Md Nur Hossain, Janatul Shabnam, Sadia Binta Basher, Md Mahfuzul Hoque i Md Zahurul Haque. "Charaterization of isolated potential lactobacilli and used as probiotic food". Asian-Australasian Journal of Bioscience and Biotechnology 1, nr 2 (31.08.2016): 274–83. http://dx.doi.org/10.3329/aajbb.v1i2.61575.
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This research was carried out to isolate and identify lactobacilli from yogurt and vegetables sample from Dhaka, Bangladesh. Twenty five Lactobacillus strains were isolated and identified as Lactobacillus species based on cultural characteristics, biochemical tests, and sugar fermentation. The results showed only four among twenty five isolates were highly responded to probiotic criteria such as low pH tolerance (2.5), bile salt tolerance (2%), gastric juice tolerance (0.5% bile salt, 0.2% NaCl, 0.32% pepsin pH 2.5) in-vitro and were identified strains as Lactobacillus plantarum imy-21, Lactobacillus plantarumimy-22, Lactobacillus plantarum imv-26 and Lactobacillus acidophilus imy-37 according to Bergey's Manual of Systematic Bacteriology and 16s rDNA sequencing. All of the strains were showed protease activity on skim milk agar. These strains were sensitive to ampicillin, doxycycline, erythromycin and tetracycline; also have antimicrobial activity against enteric pathogen such as ATCC of Salmonella Enteritidis, Staphylococcus aureus, Listeria monocytogenes, Shigella flexneri, Bacillus cereus, Klebsiella pneumoniae and Escherichia coli (environmental isolates). Four isolated Lactobacilli strains were able to maintain their probiotic properties in freeze dried condition over 90 day’s storage. This study concludes that these strains may be used as potential candidate as probiotic food. Asian Australas. J. Biosci. Biotechnol. 2016, 1 (2), 274-283
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Fangous, M. S., Y. Alexandre, N. Hymery, S. Gouriou, D. Arzur, G. Le Blay i R. Le Berre. "Lactobacilli intra-tracheal administration protects from Pseudomonas aeruginosa pulmonary infection in mice – a proof of concept". Beneficial Microbes 10, nr 8 (9.12.2019): 893–900. http://dx.doi.org/10.3920/bm2019.0069.
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The spreading of antibiotic resistance is a major public health issue, which requires alternative treatments to antibiotics. Lactobacilli have shown abilities to prevent pneumonia in clinical studies when given by oral route, certainly through the gut-lung axis involvement. Rationally, respiratory administration of lactobacilli has been developed and studied in murine model, to prevent from respiratory pathogens. It allows a direct effect of probiotics into the respiratory system. To our knowledge, no study has ever focused on the effect of probiotic intra-respiratory administration to prevent from Pseudomonas aeruginosa (PA) pneumonia, a major respiratory pathogen associated with high morbidity rates. In this study, we evaluated the beneficial activity of three Lactobacillus strains (Lactobacillus fermentum K.C6.3.1E, Lactobacillus zeae Od.76, Lactobacillus paracasei ES.D.88) previously screened by ourselves and known to be particularly efficient in vitro in inhibiting PAO1 virulence factors. Cytotoxic assays in alveolar epithelial cell line A549 were performed, followed by the comparison of two lactobacilli prophylactic protocols (one or two administrations) by intra-tracheal administration in a C57BL/6 murine model of PA pneumonia. A549 cells viability was improved from 23 to 75% when lactobacilli were administered before PAO1 incubation, demonstrating a protective effect (P<0.001). A significant decrease of 2 log of PAO1 was observed 4 h after PAO1 instillation (3×106 cfu/mouse) in both groups receiving lactobacilli (9×106 cfu/mouse) compared to PAO1 group (P<0.05). One single prophylactic administration of lactobacilli significantly decreased the secretion by 50% in bronchoalveolar lavages of interleukin (IL)-6 and tumour necrosis factor-α compared to PAO1. No difference of secretion was observed for the IL-10 secretion, whatever the prophylactic study design. This is the first study highlighting that direct lung administration of Lactobacillus strains protect against PA pneumonia. Next step will be to decipher the mechanisms involved before developing this novel approach for human applications.
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Qin, Da, Yixuan Ma, Yanhong Wang, Xilin Hou i Liyun Yu. "Contribution of Lactobacilli on Intestinal Mucosal Barrier and Diseases: Perspectives and Challenges of Lactobacillus casei". Life 12, nr 11 (16.11.2022): 1910. http://dx.doi.org/10.3390/life12111910.
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The intestine barrier, the front line of normal body defense, relies on its structural integrity, microbial composition and barrier immunity. The intestinal mucosal surface is continuously exposed to a complex and dynamic community of microorganisms. Although it occupies a relatively small proportion of the intestinal microbiota, Lactobacilli has been discovered to have a significant impact on the intestine tract in previous studies. It is undeniable that some Lactobacillus strains present probiotic properties through maintaining the micro-ecological balance via different mechanisms, such as mucosal barrier function and barrier immunity, to prevent infection and even to solve some neurology issues by microbiota–gut–brain/liver/lung axis communication. Notably, not only living cells but also Lactobacillus derivatives (postbiotics: soluble secreted products and para-probiotics: cell structural components) may exert antipathogenic effects and beneficial functions for the gut mucosal barrier. However, substantial research on specific effects, safety and action mechanisms in vivo should be done. In clinical application of humans and animals, there are still doubts about the precise evaluation of Lactobacilli’s safety, therapeutic effect, dosage and other aspects. Therefore, we provide an overview of central issues on the impacts of Lactobacillus casei (L. casei) and their products on the intestinal mucosal barrier and some diseases and highlight the urgent need for further studies.
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Foley, Matthew H., Sarah O’Flaherty, Garrison Allen, Alissa J. Rivera, Allison K. Stewart, Rodolphe Barrangou i Casey M. Theriot. "Lactobacillus bile salt hydrolase substrate specificity governs bacterial fitness and host colonization". Proceedings of the National Academy of Sciences 118, nr 6 (1.02.2021): e2017709118. http://dx.doi.org/10.1073/pnas.2017709118.
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Primary bile acids (BAs) are a collection of host-synthesized metabolites that shape physiology and metabolism. BAs transit the gastrointestinal tract and are subjected to a variety of chemical transformations encoded by indigenous bacteria. The resulting microbiota-derived BA pool is a mediator of host–microbiota interactions. Bacterial bile salt hydrolases (BSHs) cleave the conjugated glycine or taurine from BAs, an essential upstream step for the production of deconjugated and secondary BAs. Probiotic lactobacilli harbor a considerable number and diversity of BSHs; however, their contribution to Lactobacillus fitness and colonization remains poorly understood. Here, we define and compare the functions of multiple BSHs encoded by Lactobacillus acidophilus and Lactobacillus gasseri. Our genetic and biochemical characterization of lactobacilli BSHs lend to a model of Lactobacillus adaptation to the gut. These findings deviate from previous notions that BSHs generally promote colonization and detoxify bile. Rather, we show that BSH enzymatic preferences and the intrinsic chemical features of various BAs determine the toxicity of these molecules during Lactobacillus growth. BSHs were able to alter the Lactobacillus transcriptome in a BA-dependent manner. Finally, BSHs were able to dictate differences in bacterial competition in vitro and in vivo, defining their impact on BSH-encoding bacteria within the greater gastrointestinal tract ecosystem. This work emphasizes the importance of considering the enzymatic preferences of BSHs alongside the conjugated/deconjugated BA–bacterial interaction. These results deepen our understanding of the BA–microbiome axis and provide a framework to engineer lactobacilli with improved bile resistance and use probiotics as BA-altering therapeutics.
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Mokhtari, Sepideh, Saede Atarbashi-Moghadam, Elahe Motevaseli, Soudeh Ghafouri-Fard i Ardeshir Hesampour. "Lactobacillus fermentum and Lactobacillus crispatus Do Not Have Cytotoxic Effects on HN5 Oral Squamous Cell Carcinoma Cell Line". International Journal of Dentistry 2021 (28.09.2021): 1–6. http://dx.doi.org/10.1155/2021/3034068.
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Background. The oral environment has a very complex normal flora and a wide variety of bacteria including lactobacilli. Studies have shown oral microbial flora has important influence in the development of oral cancer. Squamous cell carcinomas account for more than 90% of cancers in oral cavity. Lactobacilli are known as one of the newest methods for the prevention and treatment of cancers. Previous studies on the effects of probiotics on oral cancer cells are very limited, and only two species of Lactobacillus which are not present in the normal oral microflora have been studied. Due to the unknown effects of lactobacilli on oral cancer, this study aimed to investigate the effect of two species of lactobacilli of oral cavity on oral cancer cells. Methods and Materials. The effects of the supernatant of two lactobacilli, namely, fermentum and crispatus were studied on HN5-cancer cells. The MTT method was used to study the effects of lactobacilli on inhibition of cancer cell growth. Results. The results showed that these lactobacilli do not prevent the progression of oral cancer cells. Moreover, the results showed that the acidic medium had the most effect on reducing the growth of oral cancer cells. Conclusion. Due to the different effects of lactobacilli on various cancer types, the effects of two Lactobacillus crispatus and Lactobacillus fermentum on other oral cancer cell lines may be different from what has been reported in this study.
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Rocha-Ramírez, Luz María, Ulises Hernández-Chiñas, Silvia Selene Moreno-Guerrero, Arturo Ramírez-Pacheco i Carlos A. Eslava. "Probiotic Properties and Immunomodulatory Activity of Lactobacillus Strains Isolated from Dairy Products". Microorganisms 9, nr 4 (13.04.2021): 825. http://dx.doi.org/10.3390/microorganisms9040825.
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Lactobacilli species are an effective biotherapeutic alternative against bacterial infections and intestinal inflammatory disorders. However, it is important to evaluate their beneficial properties, before considering them as probiotics for medical use. In this study we evaluated some probiotic properties of Lactobacillus rhamnosus GG, Lactobacillus rhamnosus KLSD, Lactobacillus helveticus IMAU70129, and Lactobacillus casei IMAU60214 previously isolated from dairy products and as control Lactobacillus casei Shirota. Experimental evaluations revealed that all strains expressed hydrophobicity (25–40%), auto-aggregation (55–60%), NaCl tolerance (1–4%), adhesion to Caco-2 cells (25–33%), partial inhibition on adherence of Escherichia coli ATCC 35218, Salmonella Typhimurium ATCC 14028, and Staphylococcus aureus ATCC 23219. Cell-free supernatants (CFS) of Lactobacilli also inhibit growth of these pathogens. In immunomodulatory properties a reduction of interleukin-8 (IL-8) and nitric oxide (NO) release was observed in assays with Caco-2 cells stimulated with interleukin-1β (1 ng/mL), or lipopolysaccharide (0.1 µg/mL). On the other hand, the damage induced to Caco-2 cells with sodium dodecyl sulfate (SDS) was attenuated when the cultured cells were pretreated with L. rhamnosus KLDS, L. helveticus IMAU70129 and L. casei IMAU60214. These Lactobacilli possess probiotic properties determined by both an antagonistic activity on pathogenic bacteria and reduction in the inflammatory response of cells treated with SDS, a pro-inflammatory stimulant.
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Harčárová, M., E. Čonková, P. Naď, P. Váczi i M. Proškovcová. "In Vitro Inhibitory Activity of Cell-Free Supernatants of Lactobacillus Spp. and Bacillus Spp. Against Fusarium graminearum". Folia Veterinaria 65, nr 3 (1.09.2021): 9–14. http://dx.doi.org/10.2478/fv-2021-0022.
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Abstract In this study, the antifungal activity of cell-free supernatant (CFS) of Lactobacillus spp. (Lactobacillus plantarum CCM 1904; L81, Lactobacillus fermentum; 2I3, Lactobacilus reuteri; 2/6, L26;) and Bacillus spp. (Bacillus subtilis CCM 2794, Bacillus licheniformis CCM 2206) against two strains of Fusarium graminearum CCM F-683 and Fusarium graminearum CCM 8244 were investigated in vitro. All tested CFS of Lactobacillus spp. were able to inhibit the growth of both strains of Fusarium graminearum. The highest inhibitory effect (IE) (56.5 %) against F. graminearum CCM F-683 was observed for CFS Lactobacillus fermentum (2I3) at the minimum inhibitory concentration (MIC) (2.25 ± 0.56 mg.ml–1). CFS of Lactobacillus reuteri (2/6) showed the best IE (40.0 %) against F. graminearum CCM 8244 (2/6) at the MIC 1.25 mg.ml–1. However, no inhibitory effect of Bacillus subtilis and Bacillus licheniformis CFS against both strains of F. graminearum were observed, even at the highest tested concentration of 5.0 mg.ml–1.
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Spurbeck, Rachel R., i Cindy Grove Arvidson. "Inhibition of Neisseria gonorrhoeae Epithelial Cell Interactions by Vaginal Lactobacillus Species". Infection and Immunity 76, nr 7 (14.04.2008): 3124–30. http://dx.doi.org/10.1128/iai.00101-08.
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ABSTRACT High levels of Lactobacillus, the dominant genus of the healthy human vaginal microbiota, have been epidemiologically linked to a reduced risk of infection following exposure to the sexually transmitted pathogen Neisseria gonorrhoeae. In this work, a cell culture model of gonococcal infection was adapted to examine the effects of lactobacilli on gonococcal interactions with endometrial epithelial cells in vitro. Precolonization of epithelial cells with Lactobacillus jensenii, Lactobacillus gasseri ATCC 33323, or L. gasseri ATCC 9857 reduced gonococcal adherence by nearly 50%. Lactobacilli also inhibited gonococcal invasion of epithelial cells by more than 60%, which was independent of the effect on adherence. Furthermore, lactobacilli were able to displace adherent gonococci from epithelial cells, suggesting that these organisms have potential as a postexposure prophylactic. Thus, vaginal lactobacilli have the ability to inhibit gonococci at two key steps of an infection, which might have a significant effect in determining whether the gonococcus will be able to successfully establish an infection following exposure in vivo.
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Terzic-Vidojevic, Amarela, Sanja Mihajlovic, Gordana Uzelac, Natasa Golic, Dj Fira, M. Kojic i Lj Topisirovic. "Identification and characterization of lactic acid bacteria isolated from artisanal white brined Golija cows’ milk cheeses". Archives of Biological Sciences 66, nr 1 (2014): 179–92. http://dx.doi.org/10.2298/abs1401179t.
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The aim of this study was to identify and characterize the lactic acid bacteria (LAB) of artisanal Golija raw and cooked cows? milk cheeses traditionally manufactured without the addition of starter culture. A total of 188 Gram-positive and catalase-negative isolates of Golija cheeses were obtained from seven samples of different ripening time. Phenotypebased assays as well as rep-PCR and 16S rDNA sequence analysis were undertaken for all 188 Lstrains. The most diverse species were isolated from 20-day-old BGGO8 cheese (Lactobacillus fermentum, Lactobacillus plantarum, Lactobacillus casei/paracasei, Lactobacillus sucicola, Lactococcus lactis subsp. lactis, Lactococcus lactis subsp. lactis bv. diacetylactis, Enterococcus faecium, Enterococcus durans and Leuconostoc mesenteroides). In other Golija cheeses Lactobacillus reuteri, Lactobacillus curvatus, Lactobacillus rhamnosus, Lactococcus lactis subsp. cremoris, Lactococcus garvieae, Streptococcus thermophilus and Leuconostoc pseudomesenteroides were found. Pronounced antimicrobial properties showed enterococci (13/42) and lactococci (12/31), while the good proteolytic activity demonstrated lactococci (13/31) and lactobacilli (10/29).
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Pedersen, Carsten, i Stefan Roos. "Lactobacillus saerimneri sp. nov., isolated from pig faeces". International Journal of Systematic and Evolutionary Microbiology 54, nr 4 (1.07.2004): 1365–68. http://dx.doi.org/10.1099/ijs.0.03057-0.
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In studying the composition of the Lactobacillus flora of faeces from pigs fed different diets, isolates with notable differences in their 16S rRNA gene sequence compared to recognized species were found. Phenotypic characteristics together with 16S rRNA gene sequences revealed that the isolates represented a novel species belonging to the Lactobacillus mali subgroup of lactobacilli. The name Lactobacillus saerimneri sp. nov. is proposed (type strain GDA154T=LMG 22087T=DSM 16049T=CCUG 48462T).
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EL SODA, M., Howaida ABD EL WAHAB, Nihal EZZAT, M. J. DESMAZEAUD i A. ISMAIL. "The esterolytic and lipolytic activities of the Lactobacilli. II. Detection of the esterase system of Lactobacillus helveticus, Lactobacillus bulgaricus. Lactobacillus lactis and Lactobacillus acidophilus". Le Lait 66, nr 4 (1986): 431–43. http://dx.doi.org/10.1051/lait:1986428.
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Brisbin, J. T., P. Parvizi i S. Sharif. "Differential cytokine expression in T-cell subsets of chicken caecal tonsils co-cultured with three species of Lactobacillus". Beneficial Microbes 3, nr 3 (1.09.2012): 205–10. http://dx.doi.org/10.3920/bm2012.0014.
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Members of the intestinal microbiota play an important role in the development of T-cells. Little is known about responses of intestinal T-cell subsets of chickens to commensal bacteria. Therefore, we set out to characterise cytokine responses in T-cells after exposure to lactobacilli. Caecal tonsil mononuclear cells were isolated and co-cultured with Lactobacillus acidophilus, Lactobacillus reuteri and Lactobacillus salivarius for 12 hours. Subsequently the CD4+ and CD8+ cells were fractionated by flow cytometry and the expression of pro- and anti-inflammatory cytokines as well as Toll-like receptor 21 (TLR21) was determined. The results demonstrated that chicken CD4+ and CD8+ T-cells express TLR21 and that the various isolates of lactobacilli differentially induces the expression of interleukin 10, interferon-gamma and transforming growth factor beta. Our results demonstrate that different Lactobacillus species have the capacity to regulate intestinal T-cell responses and that these responses may be important to intestinal homeostasis.
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Budilovskaya, Olga V., Elena V. Spasibova, Kira V. Shalepo, Tatiana A. Khusnutdinova, Anna A. Krysanova, Anna A. Siniakova, Olesya N. Bespalova i Alevtina M. Savicheva. "Antagonistic and antibacterial activity of <i>Lactobacillus rhamnosus</i> HN001 and <i>Lactobacillus acidophilus</i> La-14 included in the oral probiotic". Journal of obstetrics and women's diseases 73, nr 3 (17.07.2024): 27–39. http://dx.doi.org/10.17816/jowd630698.
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BACKGROUND: A microbial imbalance in the vaginal biotope leads to the development of vaginal infections and is associated with urinary tract infections. The ineffectiveness of the therapy and the frequent recurrence of these infections are important reasons for searching for alternative treatment strategies. A progressive solution to this issue has been the use of oral probiotics with a targeted effect on the intestinal and vaginal microflora. AIM: The aim of this study was to evaluate the antagonistic and antibacterial activity of the probiotic strains Lactobacillus rhamnosus HN001 and Lactobacillus acidophilus La-14, which are the components of the oral probiotic, against opportunistic microorganisms of intestinal origin, while assessing the sensitivity of these strains to antimicrobial drugs. MATERIALS AND METHODS: The probiotic strains Lactobacillus rhamnosus HN001 and Lactobacillus acidophilus La-14 included in the oral probiotic Duogynal® were cultivated and the grown colonies were identified using the matrix-assisted laser desorption/ionization time-of-flight mass spectrometry method (Bruker Daltonics GmbH Co., Germany). To study the antagonism of the probiotic strains of lactobacilli and opportunistic pathogenic microorganisms, the following 11 clinical isolates were collected: Escherichia coli (two isolates), Klebsiella pneumoniae, Klebsiella oxytoca, Enterobacter asburiae, Proteus mirabilis, Citrobacter freundii, Staphylococcus aureus, Enterococcus faecalis, Streptococcus agalactiae, and Candida albicans. To assess the sensitivity of the probiotic strains to antimicrobial drugs, the Gram Positive AST panel (Autobio Diagnostics Co., Ltd, China) was used. RESULTS: When the microorganisms were co-cultivated with the probiotic lactobacilli (Lactobacillus rhamnosus HN001 and Lactobacillus acidophilus La-14), we noted a decrease in pH and the death of opportunistic microorganisms such as Escherichia coli, Klebsiella pneumoniae, Klebsiella oxytoca, Enterobacter asburiae, Proteus mirabilis, Citrobacter freundii, Staphylococcus aureus, Enterococcus faecalis, and Streptococcus agalactiae, as well as yeast-like fungi Candida albicans. When studying antibiotic resistance, it was found that the both strains of lactobacilli were resistant to ampicillin, vancomycin, daptomycin, clindamycin, linezolid, moxifloxacin, nitrofurantoin, oxacillin, oritavancin, penicillin, rifampin, teicoplanin, tigecycline, trimethoprim/sulfamethoxazole, cefoxitin, ceftarolin, and ciprofloxacin. CONCLUSIONS: The oral probiotic, which contains a combination of two lactobacilli (Lactobacillus rhamnosus HN001 and Lactobacillus acidophilus La-14), has pronounced antagonistic activity against opportunistic microorganisms. These strains are resistant to most antibacterial drugs used in widespread clinical practice, which may be the basis for recommending the use of this probiotic drug together with prescribed antibiotics for prevention of vaginal or intestinal dysbiosis.
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Bruno-Bárcena, Jose M., Jason M. Andrus, Stephen L. Libby, Todd R. Klaenhammer i Hosni M. Hassan. "Expression of a Heterologous Manganese Superoxide Dismutase Gene in Intestinal Lactobacilli Provides Protection against Hydrogen Peroxide Toxicity". Applied and Environmental Microbiology 70, nr 8 (sierpień 2004): 4702–10. http://dx.doi.org/10.1128/aem.70.8.4702-4710.2004.
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ABSTRACT In living organisms, exposure to oxygen provokes oxidative stress. A widespread mechanism for protection against oxidative stress is provided by the antioxidant enzymes: superoxide dismutases (SODs) and hydroperoxidases. Generally, these enzymes are not present in Lactobacillus spp. In this study, we examined the potential advantages of providing a heterologous SOD to some of the intestinal lactobacilli. Thus, the gene encoding the manganese-containing SOD (sodA) was cloned from Streptococcus thermophilus AO54 and expressed in four intestinal lactobacilli. A 1.2-kb PCR product containing the sodA gene was cloned into the shuttle vector pTRK563, to yield pSodA, which was functionally expressed and complemented an Escherichia coli strain deficient in Mn and FeSODs. The plasmid, pSodA, was subsequently introduced and expressed in Lactobacillus gasseri NCK334, Lactobacillus johnsonii NCK89, Lactobacillus acidophilus NCK56, and Lactobacillus reuteri NCK932. Molecular and biochemical analyses confirmed the presence of the gene (sodA) and the expression of an active gene product (MnSOD) in these strains of lactobacilli. The specific activities of MnSOD were 6.7, 3.8, 5.8, and 60.7 U/mg of protein for L. gasseri, L. johnsonii, L. acidophilus, and L. reuteri, respectively. The expression of S. thermophilus MnSOD in L. gasseri and L. acidophilus provided protection against hydrogen peroxide stress. The data show that MnSOD protects cells against hydrogen peroxide by removing O2 ·− and preventing the redox cycling of iron. To our best knowledge, this is the first report of a sodA from S. thermophilus being expressed in other lactic acid bacteria.