Dissertations / Theses on the topic 'Rats – Anatomy'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Rats – Anatomy.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Buhrmann, Kristin. "A behavioral and anatomical examination of the intramodal and intramodal effects of early stimulation history and selective posterior cortical lesions in the rat." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29348.
Full textArts, Faculty of
Psychology, Department of
Graduate
Todd, Dorothy A. "A study of pyretics in rats and mice." Thesis, University of Aberdeen, 1986. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU004772.
Full textHuang, Zhigao. "Implication of anti-apoptotic genes in neuronal death following focal cerebral ischemia in rats." Thesis, University of Ottawa (Canada), 2002. http://hdl.handle.net/10393/6270.
Full textWatson, Charles. "Brain mapping." Thesis, The University of Sydney, 2011. https://hdl.handle.net/2123/28840.
Full textKruszynska, Y. T. "Metabolic effects of portal and peripheral insulin delivery in streptozotocin diabetic rats." Thesis, University of Newcastle Upon Tyne, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356789.
Full textRupanagudi, S. R. "Pathogenesis of thyroid enlargement and involution in rats treated with antithyroid compounds." Thesis, University of Surrey, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383301.
Full textBaker, Gregory Lloyd. "The role of milk-borne epidermal growth factor on hepatic development in artificially reared suckling rats." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/289229.
Full textWan, J. M.-F. "The effect of E. coli endotoxin on the metabolic responses of Wistar rats." Thesis, University of Southampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376188.
Full textCarter, Katharine Christine. "The specificity of the host's immunological response to invasive nematode parasites of rats." Thesis, University of Edinburgh, 1986. http://hdl.handle.net/1842/13330.
Full textBritton, Ann Patricia. "A morphological investigation of the effects of pregnant mare serum gonadotrophin on oocyte maturation, fertilization and embryonic development in rats." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30962.
Full textMedicine, Faculty of
Obstetrics and Gynaecology, Department of
Graduate
Custodio, Marcelo Graziano. "Análise morfológica renal de ratas prenhes submetidas ao estresse." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/5/5139/tde-11122006-102216/.
Full textThis study evaluated the kidneys from pregnant and non-pregnant Wistar rats exposed to chronic stress and its respective control groups. The chronic stress consisted of noise exposure (30 minutes of 100-dB each two hours interval) and super-population between the 7th and 14th day and the acute stress of thirty minutes immobilization in the 18th of pregnancy two days before the end of the experiment. All the rats were killed in the 20th day of protocol. The kidneys were studied and also the weight of the rats in the 1st, 7th, 14th and 20th day, the caudal artery blood pressure in the 5th and 18th day, and the fetus and placentas weight. There were not seen any alteration using light microscopy in the kidney of rats submitted to stress; although it was observed a significant increase in systolic (154.4 ± 14.2 mmHg) and diastolic (89.0 ± 8.7 mmHg) caudal blood pressure in the 18th day in the pregnant stress group (p < 0.05) in relation to the control group (129.1 ± 13.1 mmHg and 79.9 ± 18.1 mmHg, respectively) and a decrease in fetal (2.54 ± 0.32g) and placenta (0.53 ± 0.09g) weight in the 20th day in the pregnant stress group (p < 0.001) in relation to the control group (2.95 ± 0.53g and 0.60 ± 0.08g, respectively). The analyzed model may be employed to evaluate the intrauterine growth restriction in rats, caused by chronic stress, probably induced by hypertension during the pregnancy
Boyko, Jeffrey M. "Carcass nitrogen as a predictor of lysine requirement in the adult female rat." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/91163.
Full textM.S.
Normandin, Joseph Jeremy. "Anatomy and Physiology of the Nucleus Paragigantocellularis: Neural Regulation of Genital Reflexes in Male and Female Rats." Digital Archive @ GSU, 2010. http://digitalarchive.gsu.edu/biology_diss/73.
Full textMontoya-Sanhueza, Germán Andrés. "Functional anatomy, osteogenesis and bone microstructure of the appendicular system of African mole-rats (Rodentia: Ctenohystrica: Bathyergidae)." Doctoral thesis, Faculty of Science, 2021. http://hdl.handle.net/11427/32855.
Full textZhang, Zhao 1960. "Studies on mechanisms of delayed puberty in female rats effected by dietary eicosapentaenoic acid." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278267.
Full textMinchev, Kiril M. "Age-related changes in kidney function in female pigmented Royal College of Surgeons (RCS) rats." Virtual Press, 2000. http://liblink.bsu.edu/uhtbin/catkey/1178344.
Full textDepartment of Physiology and Health Science
McLaren, Julie. "Quantification of mRNA levels for LH-beta, FSH-beta, alpha and prolactin in female rats following chronic or acute estrogen treatment." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68220.
Full textIn order to determine the mechanisms by which a defective GnRH pattern affects pituitary LH functions, we quantitated LH-beta and alpha mRNA in EV-injected animals using Northern blot analysis. To determine whether estradiol has direct effects at the pituitary level, we studied estradiol implanted (E2) animals that do not have the hypothalamic lesion. In order to observe possible effects on prolactin and FSH (normal plasma levels) we also quantitated them in EV or E2-treated animals.
Our results indicate that LH-beta, but not alpha or FSH-beta RNA are below control levels in both EV and E2 treated animals. Thus estrogen can modulate LH-beta production at both the hypothalamic (EV) and pituitary (E2) levels. Prolactin was sometimes below that of control animals which is surprising since estradiol is a known stimulator of prolactin production.
Osburn, James Roy. "Importance of the kappa opoid system for ultrasonic vocalizations of young rats: Role of peripherally-versus centrally-located kappa opioid receptors." CSUSB ScholarWorks, 2008. https://scholarworks.lib.csusb.edu/etd-project/3378.
Full textRichey, Meghan. "Observations of idazoxan and xylazine on the myometrial response of the normal, cycling virgin rat in vitro." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09292009-020109/.
Full textLazosky, Darien-Alexis. "Histochemical changes in colonic epithelial glycoproteins during the induction of cancer in rats." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24838.
Full textMedicine, Faculty of
Pathology and Laboratory Medicine, Department of
Graduate
Allbutt, Haydn. "The rat spinal cord following traumatic injury: An anatomical and behavioural study examining NADPH-d and fos." Thesis, The University of Sydney, 2004. http://hdl.handle.net/2123/1335.
Full textAllbutt, Haydn. "The rat spinal cord following traumatic injury: An anatomical and behavioural study examining NADPH-d and fos." University of Sydney, 2004. http://hdl.handle.net/2123/1335.
Full textThe general aim of this current work was to examine spinal cord injury (SCI), and in particular to examine the pathology of injury as it relates to changes in sensory transmission. Due to the limited possibilities for experimentation in humans, a range of animal models of SCI have been developed and are reviewed here. The weight drop SCI model is the most similar to the clinical presentation of SCI in humans and has been widely used in the rat. It was selected for the series of experiments reported in this thesis. Many of the functional deficits produced by SCI result from a cascade of biochemical events set into motion by the injury. Included amongst these is the activation of the enzyme nitric oxide synthase which produces the gaseous neuromodulator, nitric oxide (NO). NO is amongst the most widely distributed and widely utilised molecule in virtually all living organisms, and it is an important signalling molecule in the nervous system. One of the major functions performed by NO appears to relate to sensory transmission, and thus alterations in sensory transmission observed as a result of SCI may involve alterations to NO synthesis. One of the principal aims of this thesis was to examine the effect of SCI on the NO producing cells of the spinal cord and to consider what any changes in NO synthesis may suggest in regards to sensation. NO producing cells were examined using NADPH diaphorase (NADPH-d) histochemistry. As the symptoms of SCI such as motor loss and changes in sensory processing are functional changes, it was also useful to examine changes in neuronal function as a result of SCI. Widespread neuronal function was examined via immunohistochemical detection of the gene product of the immediate early gene, c-fos. It is not known how extensive the biochemical changes resulting from SCI may be, thus another of the aims of the present thesis was to examine the effects of SCI on NO synthesis not only at the level of injury, but also distant to the injury. Findings of the present thesis indicated that traumatic SCI resulted in a decrease in the number of NADPH-d positive cells from the superficial dorsal horn (SDH) of the spinal cord, while the number of these cells are increased in the ventral horn. These changes were restricted to spinal segments adjacent to the injury. Fos expression was also altered by injury and was found to decrease. The most profound changes were found to occur in lamina III, although the other laminae also demonstrated similar changes. Changes in fos expression however were notably more widespread than those for NADPH-d and were not restricted to the level of the injury, occurring at all levels of the spinal cord examined. It was interpreted that alterations in NO synthesis appear to be modulated by the local injury-induced environment while fos expression may be altered by widespread changes to the global level of activity within the central nervous system. Having observed that the number of NADPH-d positive cells of the SDH is reduced following injury, it was of interest to determine whether these cells were in fact killed, or whether they were still present but with reduced NADPH-d activity. Cell counts suggested that the NADPH-d positive cells, which were likely to represent a population of inhibitory interneurons, were not killed following injury, but rather are disrupted such that their normal biochemistry is altered. Since these cells were likely to be inhibitory and were located in laminae involved in sensory transmission, the question arose how disruption of these cells may relate to the neuropathic pain observed to develop following SCI. Thus both NADPH-d and fos expression were again examined, but this time in conjunction with the sensory function of the rats. Sensory thresholds to pain-like behaviour were determined prior to and after injury using Von Frey filaments. Rats that demonstrated a decrease in sensory threshold of at least two Von Frey filament gradations (>70%) were classed as allodynic, while those with a less than a 70% decrease in threshold were classed as non-allodynic. A subpopulation of each of the groups of rats (uninjured, non-allodynic and allodynic) underwent a somatic stimulation paradigm. It was found that stimulation resulted in an increase in the number of NO producing cells but only in the allodynic group of animals. Since this group of animals by definition would perceive this stimulation as noxious, it is likely that the noxious nature of the stimulation resulted in the increased number of NO producing cells observed. This effect occurred only in segments adjacent to the injury. When fos expression was examined in the uninjured animals it was noted that somatic stimulation resulted in a decrease in fos expression, almost exclusively in lamina III. Following injury, there was no change in fos expression in lamina III observed. Instead the only change observed was an increase in fos expression in the deep dorsal horn (DDH, lamina IV and V). This occurred most profoundly in the allodynic group. These results suggested that SCI may lead to misprocessing of sensory signals such that non-noxious somatic stimuli are processed in the DDH rather than lamina III following SCI. It is proposed here that this change in laminae processing may be responsible for the perception of pain towards a non-noxious stimulus, and that the reported injury-induced loss of NO producing inhibitory interneurons in the SDH may be responsible for this alteration in sensory processing following SCI. Sensation is also processed by a number of supraspinal structures and a number of these have been implicated in the development of neuropathic pain states. The effects of SCI on neuronal activity as well as NO synthesis were examined in the periaqueductal grey region of the mid brain (PAG). SCI was shown to result in reduced neuronal activity in the PAG. This reduction in activity did not follow the somatotopy of the lateral column of the PAG (lPAG). It was suggested the reduced activity may not be solely caused by reduced spinal input as a result of SCI. Reduced neuronal activity in the PAG may indicate reduced PAG function, which includes descending modulation of spinal sensory transmission. Injury was not found to alter NADPH-d expression in the PAG. The effect of traumatic lumbar SCI on the parietal (sensorimotor) cortex of the rat was also examined, as loss of inputs following SCI have been shown to result in a profound reorganisation of the cortex. Results indicated that SCI results in a virtual cessation of neuronal activity in areas 1 and 2 of the parietal cortex, likely as a result of lost afferent drive. Theories of cortical plasticity suggest that while the primary inputs via the lumbar spinal cord may be lost following SCI, other less dominants input will remain and become more dominant. It has been proposed previously that cortical reorganisation involves a rapid reorganisation of the entire sensory system. It was interpreted that a similar process may explain the system-wide reduction in neuronal activity observed in the present series of studies.
Rivero, Dolores Helena Rodriguez Ferreira. "Alterações eletrocardiográficas, hematológicas e histológicas induzidas pelo material particulado fino na cidade de São Paulo." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/5/5160/tde-07102014-090749/.
Full textThe mechanisms involved in the association between air pollution and increased cardiovascular mortality are not fully understood. The objective of this study was to test the acute effects of Sao Paulo PM2.5 on heart rate, heart rate variability, systemic inflammation and vasoconstriction of arterioles of healthy Wistar rats. PM2.5 was collected in glass fiber filters using a high volume sampler. Forty-seven rats were submitted to tracheal instillation with: saline, blank filter, 50 ?g and 100 ?g of PM2.5 to ECG analysis. Heart rate (HR) and standard deviation of the intervals between normal beats (SDNN) were assessed immediately before, 30 and 60 minutes after instillation. Another thirty-eight rats were submitted to tracheal instillation with: blank filter, 100 ?g and 500 ?g of PM2.5 to hematological and histopathological analysis. These animals were sacrificed 24 hours after instillation when blood, heart and lung samples were collected for morphological and wet-to-dry weight ratio analysis. HR decreased significantly (p< 0.001) with time, but no significant effect of treatment or interaction between time and treatment was observed. SDNN decreased 60 minutes after instillation in groups PM2.5 50 ?g and 100 ?g (p=0.025). Reticulocytes significantly increased at both PM2.5 doses (p<0.05) while hematocrit levels increased in the 500 ?g group (p<0.05). Segmented, neutrophils and fibrinogen levels significantly decreased, while lymphocytes increaseded with 100 ?g of PM2.5 (p<0.05). A significant dose-dependent decrease of intra-acinar pulmonary arterioles Lumen/Wall ratio (L/W) was observed in PM groups (p<0.001). Peribronchiolar arterioles L/W showed a significant decrease in the 500?g group (p<0.001). A significant increase in heart wet-to-dry weight ratio was observed in the 500 ?g group (p<0.001). In conclusion, fine particles in the city of Sao Paulo induces a reduction of SDNN and promote pulmonary and cardiac histological alterations, resulting in significant vasoconstriction. In addition, we observed that the bone marrow also participated in the acute response to particles reaching the lungs
Flannery, Tiffany L. "Enhanced Neurogenesis In Subventricular Zone Of Rats That Voluntarily Ingest Fluoxetine And Simavastatin Combination Treatment." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1484566200182717.
Full textPiette, Etienne. "Scanning electron microscopic studies of the rat mandibular joint : angioarchitecture and surface morphology /." Thesis, Click to view the E-thesis via HKUTO, 1993. http://sunzi.lib.hku.hk/HKUTO/record/B38627978.
Full textHitier, Martin. "Relation du système vestibulaire avec l'hippocampe." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMC426.
Full textThe vestibular system is the only sense that lake a primary cortex but project to several cortical areas known as the "vestibular cortex". The roles and functioning of the vestibular cortex remain poorly known, neither in the physiological state, nor in pathologies involving the vestibular system. Among these cortices, the hippocampus plays a fundamental role in vestibular cognition and in particular in spatial orientation and cognitive map formation. The purpose of this work was to study the distribution of vestibular inputs within the rat’s hippocampus, which represents the species where hippocampus is best known. For this purpose we have developed a method of surgical labyrinthectomy and a method of selective electrical stimulation of each vestibular sensor (3 canals ampullae, utricular and saccular maculae). This method was then applied to study the vestibulo-ocular reflex specific of each sensor in the rat. This vestibulo-ocular reflex was further used during electrical stimulation of each sensor to control the effectiveness and selectiveness of the stimulation. Finally, we studied the vestibular imputs in the hippocampus by immunohistochemical analysis of the cFOS protein, which is considered as a marker of neuronal activity. The results show a predominance of cFOS labelling in the dorsal hippocampus, in the CA2-CA3 region. These results are consistent with the role of the dorsal hippocampus in cognition and the role of CA3 encoding of new spatial information within short-term memory and in processing the geometry of the environment
Kulkarni, Praveen P. "Functional MRI Data Analysis Techniques and Strategies to Map the Olfactory System of a Rat Brain." Digital WPI, 2006. https://digitalcommons.wpi.edu/etd-dissertations/37.
Full textKannan, Ashok. "Combining electrospun polydioxanone scaffolds, Schwann cells, and Matrigel to improve functional recovery after a complete spinal cord transection in rats." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/2737.
Full textPatullo, Ive Maria Falcone. "Efeito da hipofunção mastigatória na massa óssea da mandíbula de ratas Wistar submetidas ou não a ovariectomia." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/5/5166/tde-24092009-150336/.
Full textObjectives: This study was designed to examine the effect of masticatory hypofunction and estrogen deficiency on mandible bone mass and compare this site with spine and femoral bone. Methods: Twenty-four rats were ovariectomized (OVX) or Sham-operated (Sham) and analyzed after feeding with hard-diet (Hard) or soft-diet (Soft). They were divided into 4 groups: (GI) Sham-Hard; (GII) OVX-Hard; (GIII) Sham-Soft and (GIV) OVX-Soft. Bone mineral density (BMD) was measured in the spine and femur in the baseline and at the end of the study, and BMD (final BMD baseline BMD) was calculated. In mandible bone, BMD and histomorphometry were analyzed at the end of the experiment. Results: Sham rats showed higher spine (GI: 13.5% vs. GII:0.74%, p<0.01; GIII:10.67% vs. GIV: - 4.36%, p<0.001) and femur BMD (GI:14.43% vs. GII:4.42%, p<0.01; GIII:10.58% vs. GIV:0.49%, p<0.001) than OVX but no difference was observed in mandible BMD among these groups (p>0.05). Soft-diet groups showed decreased mandible BMD compared with hard-diet groups (GIV vs. GII, p<0.01; GIII vs. GI, p<0.01). Similarly, mandibular condyle histomorphometry showed that soft-diet groups presented a significant decrease in trabecular thickness and volume (GIV vs. GII, p<0.05; GIII vs. GI, p<0.01) compared to hard-diet. Conclusions: Our results suggest that mandibular bone loss resulted from decreased mechanical loading during mastication, and was not affect by estrogen depletion
Page, Benedict J. (Benedict John). "A histological and morphometric assessment of endocrine and ductular proliferation in the adult rat pancreas using an occlusive pancreatic duct ligation model." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51573.
Full textENGLISH ABSTRACT: Diabetes Mellitus (DM) is synonymous with "B-cell failure". Ligation of the pancreatic duct distally to its confluence into the bile duct has been shown to induce endocrine tissue regeneration from a number of probable sources. The cells responsible for regeneration are supposed to possess either dormant pluripotent stem cell ability and/or the plasticity to undergo metaplasia to form new and surplus endocrine tissue able to replace pathologically and/or experimentally compromised pancreas. The sequence of events (cell lineage) during this process of neogenesis, has been the source of controversy for quite some time as various studies suggest that the cell lineage differs from in vivo and in vitro studies, according to experimental model and species of laboratory animal. The object of this study was to utilise an established experimental laboratory animal model to study islet morphological changes, neogenesis and or both in vivo. Further aims of the study were to determine the extent, sequence and magnitude of pancreatic duct ligation (PDL) induced endocrine neogenesis/morphogenesis in a laboratory rat model using occlusive pancreatic duct ligation. PDL's were performed on six groups of 25 normal adult Sprague-Dawley (SD) rats (300g+) according to the method of Hultquist and Jonsson (1965). Experimental animals were sacrificed at 12 hr intervals from day one post-PDL to day 10 and every 24 hrs thereafter to day 14 as described by Wang, Klëppel, Bouwens (1995). Animals received BrdU (a thymidine marker and cell proliferation indicator) 50mglkg intraperitoneally as described by Wang et al. (1995), one hour prior to removal of the pancreas after which it was fixed in Bouin's solution and histologically processed. Seven consecutive 3-6 urn thick serial sections were sequentially stained with H & E, insulin (I), glucagon (G), somatostatin (ST), pancreatic polypeptide (PP), neuropeptide tyrosine (NPY) and peptide tyrosine tyrosine (PYY). Immunolabeling was done according to the method of Guesdon, Temynck , Avrameas (1979). Double immunolabeling for BrdU and each pancreatic peptide was performed on the sections on days 3,5, 7, 9 and 11 as described by Wang et al (1994). Cellular transformation between one and 3Yz days was characterised by simultaneous total deletion and/or transdifferentiation of the acinar compartment and the appearance of immunoreactive cells for I (11.53 ±1.5%), G (1.85 ±0.8%), pp (1.50 ±0.09%), and ST (1.96 ±0.24%). Changes in the endocrine composition in existing islets, occurred along a pathway that saw PP- and ST-cells invading the islet core, islet mantle glucagon deletion and random appearance of all endocrine cell types within the inter-islet interstitium on day 3Yz. Days 4 to 6Yz saw further endocrine expansion while days 7 to 14 were distinguished by islet reconstitution and consolidation. NPY immunoreactivity appeared on day 4Y2 and persisted intermittently throughout while PVV first appeared on day 4 and disappeared after day 7Yz. The results suggest that PDL firstly induced the development of endocrine tissue distributed haphazardly throughout the space previously occupied by acinar parenchyma. Secondly, the appearance of insulin is preceded by the appearance of PP, glucagon and somatostatin by 24-hours. A still to be determined proportion of the ligation induced endocrine formation appeared to be associated with existing islets, resulting in a number of very large islets, some of which might have secretory access through the glomerularlike capillary network known to occupy the islet core. The remainder appeared to form separate "new" islets, which have a dubious access to the blood stream. In conclusion, if it is true that the pancreas can regenerate some of its endocrine tissue then it has potential clinical implication for the stabilising of diabetes mellitus. Ligated exocrine pancreatic tissue, devoid of its acinar component, has been shown to contain notable quantities of insulin positive cells. This presents intriguing possibilities as an alternative for donor tissue, usually obtained from rat foetuses, during foetal rat pancreas transplantation studies. Pancreas tissue harvested from duct ligated rats could replace the foetal tissue currently used in the treatment of experimental diabetes mellitus in laboratory animals in this laboratory.
AFRIKAANSE OPSOMMING: Diabetes Mellitus is sinoniem met B-sel disfunksie. Endokriene regenerasie kan segmenteel bewerkstellig word deur eksperimentele afbinding van die pankreasbuis distaal tot sy samesmelting met die gemene galbuis. 'n Verskeidenheid van selle word vermoedelik by hierdie proses betrek. Dormante stamselle besit die vermoë en/of plastisiteit om 'n aantal vorms van metaplasie te ondergaan om nuwe en/of oortollige endokriene weefsel te vorm wat patologiese en/of eksperimenteel gekompromiseerde weefsel vervang. Die selontwikkelings volgorde wat tydens hierdie proses plaasvind is al vir 'n geruime tyd die middelpunt van 'n meningsverskil. Sommige studies dui daarop dat die in vivo selontwikkelingsvolgorde verskil van in vitro, volgens eksperimentele model en tipe proefdier gebruik. Die doel van die studie was die gebruik van 'n bestaande eksperimentele laboratorium proefdier model om pankreas eiland morfologiese verandering en/ofneogenese of beide in vivo te evalueer. Die oogmerk van die studie was om die omvang en volgorde van veranderings in die endokriene kompartement (neogenese/morfogenese) te bepaal deur gebruik te maak van 'n pankreas buis afbindings (PBA) model wat totale afsnyding van die buis tot gevolg het. PBA's is uitgevoer op ses groepe van 25 volwasse normale Sprague-Dawley (SD) laboratorium rotte (±300g) soos beskryf deur Hultquist en Jonsson (1965). Proefdiere is elke 12 uur geoffer vanaf dag een post-PBA tot dag tien en elke 24 uur daarna tot dag 14 soos beskryf deur Wang, Bouwens, Kloppel (1995) na die toediening van 50 mg/kg 5-Bromo-2-deoksi-uridien intraperitoneaal ('n selprolifererings aanduider) soos beskryf deur Wang et al. (1995). Die pankreas is werwyder, in Bouin se oplossing gefikseer en histologies geprosesseer. Sewe openvolgende seriesnitte (3-6 urn) is alternatiewelik gekleur met H & E, en immunositochemies, soos beskryf deur Guesdon, Terugnek, Avrameas (1979), vir insulien (I), glukagon (G), somatostatien (ST), pankreatiesepolipeptied (PP), neuropeptied tirosien (NPY) en peptied tirosien-tirosien (PYY). BrdU dubbel-immuunkleuring is ingesluit op dae 3,5, 7, 9 en 11 soos beskryf deur Wang et al. (1994). Sellulêre transformasie tussen dae een en 3~ dae is gekenmerk deur gelyktydige en totale uitwissing en/ofmetaplasie van die asinêre kompartement en die verskyning van selle immunorektiefvir I(11.53 ±1.5%), G (1.85 ±0.8%), PP (1.50 ±0.09%), ST (1.96 ±0.24%). Metaplasie was verantwoordelik vir merkbare veranderings in bestaande endokriene weefsel langs In transformasie weg waar eiland insulien kemselle vervang is deur PP- en ST-selle, glukagon buitelaag uitwissing en die toevallige verskyning van alle endokriene seltipes in the inter-eiland interstitium teen dag 3Y2. Dae 4Y2deur 6~ is gekenmerk deur verdere endokrinetoename terwyl dag 7 deur 14 gekenmerk is deur eiland hersamestelling en konsolidering. NPY immunoreaktiwiteit was vanaf dag 4~, met afwisseling, te bespeur terwyl PVV slegs tussen dae 4 en 7 In verskyning gemaak het. . Die resultate suggereer eerstens, PBA induseer die ontwikkeling van oortollige endokriene weefsel op In lukrake wyse versprei deur die ruimte voorheen deur asinêre parenchiem beset. Tweedens, dat die verskyning van insulien deur dié van PP, glukagon en somatostatien met minstens 24-uur voorafgegaan is. Die verhouding, van nuutgevormde endokriene weefsel wat met bestaande eilande assosieer om In aantal baie groot eilande te vorm, moet nog vasgestel word. Sulke strukture mag moontlik afskeidings toegang hê tot die bloedstroom, deur die glomerulusagtige kapillêre netwerk, in die eilandkern teenwoordig terwyl die oorblywende nuutgevormde endokrine weefsel "nuwe" apparte eilande vorm wat wel of gladnie toegang tot die bloedstroom mag hê nie. As gevolgtrekking, indien dit waar is dat volwasse pankreas eilandweefsel wel regenerasie kan ondergaan, dan het dit kliniese implikasie vir die stabilisering van diabetes mellitus. Weefsel verkry uit PBA bevat geen asinêre weefsel nie maar wel merkbare hoeveelhede endokriene weefsel, veral insulin positief. Dit bied dan interessante alternatiewe as skenker weefsel by fetal rot pankreas oorplantings. PBA en/of die oorplanting van pankreasbuis afgebinde weefsel, na in vitro weefsel kultuur, bied moontlikhede vir die behandeling van diabetes mellitus.
Carvalho, Marcio Oliveira Penna de. "Estudo da recuperação da função locomotora e histomorfométrica da lesão medular em ratos: efeitos da metilprednisolona e do gangliosídeo G(M1)." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/5/5140/tde-14042008-110025/.
Full textThe methylprednisolone and the GM-1 ganglioside are drugs with established clinical usage for the treatment of spinal cord injury in human; however its efficiency and its active mechanisms are not completely understood yet. The objective of the present paper has been to evaluate the results from the neurological function recovering and to compare these with the histomorphometric alterations in rats with spinal cord injury, prescribed with methylprednisolone; GM-1 and its association. The spinal cord injury has been done by the New York University system® in 24 Wistar rats which were assigned to one of four groups: control (n=6), MP (n=6), GM1 (n=6) and MP+GM1 (n=6). The evaluation of the neurological function outcome has been carried out using BBB locomotor rating scale on the second, seventh and fourteenth days after the injury and sacrificed on the fourteenth day for histological and morphometric analyses of total cross-sectional area, spared area and percentage of spared area. We concluded that the methylprednisolone and its association with the GM-1 revealed themselves effective concerning to the locomotor function recover and that every medicated rat demonstrated an improvement in the preserved area percentage superior to the control group. The MP and GM1 Groups were superior in the white matter preservation and the GM-1 demonstrated beneficial effects regarding the gray matter preservation at the injury epicenter. The gray matter has been more sensitive for damaged than the white matter and there has not been correlation between the histological findings and the locomotor function recovering.
Said, Marcelo Manzano. "Efeitos da azatioprina e da transecção brônquica no aparelho mucociliar: estudo experimental em ratos." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/5/5156/tde-09102014-112003/.
Full textAt the Experimental Thoracic Surgery Laboratory, Department of Cardio-Pneumology , Department of Pathology, Experimental Air Pollution Laboratory, in the Medical School, São Paulo University, research in lung transplantation, administration of imunossupression drugs and their effects on the mucociliary system are carried out. We develop models of bronchial transeccion and reanastomosis, unilateral lung transplantation, mucociliary transport velocity and mucus transportability in rats, which allow us to observe the resulting alterations. The mechanisms involved in the impairment of the mucociliary function after lung transplantation and immunosuppression therapy are not yet completely understood. The purpose of the present study was to evaluate the effects of azathioprine on the mucociliary system in a model of bronchial transeccion and reanastomosis in rats. We used 36 rats, submitted to general anesthesia, tracheal tube, mechanical ventilation and left thoracotomy, followed by a left main stem bronchus transeccion and reanastomosis. The animals were separated into 2 groups that received or not azathioprine (AZA), and being sacrificed at 7, 15 and 30 days after the surgical procedure. In situ bronchial mucociliary transport (MCT) was determined distal to the anastomosis of the left main stem transected bronchus (LTB) and in the right intact bronchus (RIB). We also studied the surface properties of mucus by using in vitro mucus transportability with a frog palate preparation and mucus contact angle (mucus adhesively) collecting mucus from LTB and RIB. The measures obtained were submitted to statistical analysis. The results showed that the MCT velocity (mm/min) was significantly lower (p<0.01) in the LTB without the AZA administration compared with the RIB with or without AZA. At the LTB with AZA administration there was significant difference (p<0.05) at 7 days compared with the RIB with and without AZA and no significant difference at 15 and 30 days (p>0.05). Mucus in vitro transportability and adhesiveness showed the worst result at the LTB without AZA (p<0.05). In the group that received AZA on 30 days of LTB there was no significantly difference in mucus properties (p>0.05) compared with the RIB groups (with and without AZA). We concluded that AZA led to a temporary marked impairment of MCT, while this occurrence was maintained up to 30 days in the transected bronchus. In addition, AZA contributes to preventing alterations in the mucus surface properties
Oliveira, Arnóbio Rocha. "Efeitos do tempo da descompressão medular no traumatismo raquimedular: estudo experimental em ratos." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/5/5140/tde-14102014-161625/.
Full textWith the objective of evaluating the effects of medullary decompression time in 50 male Wistar rats, an experimental model of medullary compression was created, through the insertion of a satin tape, which reduces in 30% the diameter of the vertebral canal at the region of the thoracic column after laminectomy (TIX and TX). The animals were distributed in five groups with 10 rats each, as follows: group A: control of the technique of atraumatic medullary exposure, with no lesion; group B, submitted to medullary compression, followed by decompression five minutes after the lesion; groups C and D underwent the same procedure, but decompression was performed 24 and 72 hours after compression, respectively; and finally, rats from group E underwent compression without decompression up to the end of the experiment on the 4th week, when all 50 rats were euthanized. All animals submitted to compression (groups B, C, D and E) presented paraplegia in the immediate post-operative period. The neurological recovery was evaluated through the motor-evoked potential of the BBB scale of locomotor capacity and anatomopathological examination of the lesion site. A direct correlation between the neurological recovery potential and time of medullary decompression was observed at the three evaluation methods
Monteiro, Rosangela. ""Avaliação das alterações anatômicas cardíacas secundárias ao enfisema pulmonar: estudo experimental em ratos"." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/5/5156/tde-09082005-111153/.
Full textCardiac alterations post-induction emphysema by instillation of papain were analyzed. Seventy-five rats (groups papain and control), sacrificed 30, 60, 90, 120 or 180 days post-instillation were evaluated. Arterial blood gases, cardiac and pulmonary morphometrical analysis were performed. Papain administration produced alveolar destruction compatible with emphysema, without arterial blood gases changes. Right ventricle and interventricular septum didn't show alterations. There were left ventricular area decrease (90 days post-induction) and light thickness increase of its wall.
Verret, Laure. "Étude anatomo-fonctionnelle des réseaux neuronaux du sommeil paradoxal chez le rat." Lyon 1, 2004. http://www.theses.fr/2004LYO10272.
Full textRoux, Candice Rene. "β-cell response to high fat diet induced metabolic demands in the obese Wistar rat." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6454.
Full textENGLISH ABSTRACT: Introduction: A westernized diet rich in saturated fats and sugars, together with a sedentary lifestyle, has contributed to the dramatic increase in obesity during the last decade (Zimmett et al, 2001; Wild et al, 2004). Obesity is associated with dyslipidemia and insulin resistance which are major risk factors for the development of type 2 diabetes (T2D) (Zimmet et al, 2001, Kahn et al, 2006; Schröder et al, 2007). High-fat feeding in rodents induces symptoms similar to the human metabolic syndrome without progression to T2D (Woods et al, 2002; Weir and Bonner-Weir, 2007). The addition of fructose to a high-fat diet exacerbates the insulin resistance and leads to impaired pancreatic function of insulin secretion and glucose intolerance (Basciano et al, 2005; Stanhope et al, 2009). Aims: The aim of this study was to establish the effect of a high-fat and sucrose/fructose diet on glucose metabolism, the development of insulin resistance and β-cell dynamics. Methods: Weanling Wistar rats were randomized into two study groups; study one over an experimental period for three months and study two for twelve months. Each study consisted of a control group that received standard rat chow and water; and two experimental groups receiving either a high-fat diet and water (HFD) or a café diet consisting of HFD with the addition of 15% sucrose/fructose (CFD). Fasting glucose and insulin concentrations, intravenous glucose tolerance test (IVGTT), glucose stimulated insulin secretion rates and 2-deoxy-[3H]-D-glucose uptake in muscle, liver and fat were measured. The pancreata were harvested for immunohistochemical labeling of β-cells (insulin), α-cells (glucagon), GLUT2 (glucose transport) and MIB5 (proliferation). Samples of the pancreata were also collected for electron microscopy. Results and discussion: Feeding Wistar rats a CFD induced obesity, insulin resistance and glucose intolerance. By twelve months the rats had an impaired glucose response with increased IVGTT peak values, area under the curve (AUC) values and glucose clearance rates. Concomitantly, the glucose stimulated insulin secretion rate (GS-ISR) was attenuated. Stimulated glucose disposal as measured by 2-deoxy-[3H]-D-glucose uptake was reduced in muscle and adipose tissue at three months. By twelve months, due to the age of the rats, stimulated glucose uptake declined compared to three months with no difference between groups. After three months the diets had no observable effect on the islets using light microscopy. However, by twelve months morphological changes were observed in both the HFD and CFD groups. In the HFD group large hypertrophied irregular islets with fibrous changes were observed. In the CFD group these morphological changes were more prominent with fibrous segregation and disruption of the normal endocrine arrangement. In addition, the presence of inflammatory cells within the affected islets is consistent with T2D. Conclusion: High-fat diet fed to Wistar rats induced obesity, abdominal adiposity and insulin resistance. The addition of sucrose/fructose to a high-fat diet exacerbated the insulin resistance and resulted in glucose intolerance and mild hyperglycemia. Morphological changes in the large islets were observed which are consistent with the development of T2D.
AFRIKAANSE OPSOMMING: Inleiding: ‘n Verwesterde dieët, ryk aan versadigde vette en suikers tesame met 'n passiewe lewenstyl, het bygedra tot die dramatiese verhoging in vetsug gedurende die laaste dekade (Zimmett et al, 2001; Wild et al, 2004). Vetsug word met dislipidemie en insulienweerstandigheid geassosieer wat hoof risikofaktore is vir die ontwikkeling van tipe 2 diabetes (T2D) (Zimmet et al, 2001; Kahn et al, 2006; Schröder et al, 2007). Hoë-vet voeding in knaagdiere induseer simptome soortgelyk aan menslike metaboliese sindroom sonder die ontwikkeling van T2D (Woods et al, 2002; Weir and Bonner-Weir, 2007). Die byvoeging van fruktose tot 'n hoë-vet dieët vererger insulienweerstandigheid en lei tot verswakte pankreas funksie, insuliensekresie en glukoseintoleransie (Basciano et al, 2005; Stanhope et al, 2009). Doelwitte: Die doelwitte van die studie was om die effek van hoë-vet en sukrose/fruktose voeding op glukosemetabolisme, die ontwikkeling van insulienweerstandigheid en β-sel dinamika te bepaal. Metodes: Gespeende Wistar rotte was in twee groepe gerandomiseer; studie een oor ʼn tydperk van drie maande en studie twee oor ʼn tydperk van twaalf maande onderskeidelik. Elke studie het 'n kontrole groep met standaard rot kos en water (control); en twee experimentele diëte wat of ʼn hoë-vet dieët en water (HFD) of 'n kafeedieët groep wat die HFD met die byvoeging van 15% sukrose/fruktose in hul drink water (CFD) ontvang. Fastende glukose en insulien, binneaarse glukose toleransie toets (IVGTT), glukose gestimuleerde insulien sekresie tempo en 2-deoxi-[3H]-D-glukose opname in spier, lewer en vet is gebruik om die effek van die dieët op glukosemetabolisme te bepaal. Die pankreata is uitgehaal vir immunohistochemiese identifisering van β-selle (insulien), α-selle (glukagoon), GLUT2 (glukose transport) en MIB5 (proliferasie). Monsters van die pankreata was ook vir elektronmikroskopie versamel. Resultate en bespreking: Voeding van ʼn CFD aan Wistar rotte induseer vetsug, insulienweerstandigheid en glukose-intoleransie Teen twaalf maande toon die rotte 'n verswakte respons tot glukose met verhoogde IVGTT piekwaardes, AUC waardes en glukose opruimingswaardes. Terselfdetyd is die glukose gestimuleerde insuliensekresie tempo (GS-ISR) ook verswak. Gestimuleerde glukose opruiming, soos deur 2-deoxi-[3H]-D-glukose opname bepaal, was verlaag in spier en vetweefsel teen drie maande. Teen twaalf maande, weens die ouderdom van die rotte, is die gestimuleerde glukose opname verlaag in vergelyking met drie maande sonder 'n verskil tussen groepe. Na drie maande kon geen sigbare morfologiese verskille met ligmikroskopie tussen die diëte waargeneem word nie. Teen twaalf maande is morfologiese verskille waargeneem in beide die HFD en die CFD groepe. In die HFD groep is groot hipertrofiese onreëlmatige eilande met fibrotiese verandering waargeneem. In die CFD groep was die morfologiese verandering meer gevorder met fibrotiese onderverdeling en ontwrigting van die normale endokriene rangskikking. Die teenwoordigheid van inflammatoriese selle in die geaffekteerde eilande is verenigbaar met T2D. Afleiding: Die voer van 'n hoë-vet dieët aan Wistar rotte veroorsaak vetsug, abdominale adipositeit en insulienweerstandigheid. Die byvoeging van sukrose/ fruktose tot die hoë-vet dieët vererger die insulienweerstandigheid en veroorsaak glukoseintoleransie en matige hiperglukemie. Morfologiese veranderings in die groter eilande was verenigbaar met T2D.
Guerra, Flavia Da Ré 1984. "Avaliação morfologica e bioquimica do disco articular da ATM de ratos submetidos a terapia com laser de baixa potencia : estudo experimental em animais portadores de disfuncão temporomandibular." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/317511.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biololgia
Made available in DSpace on 2018-08-13T18:19:09Z (GMT). No. of bitstreams: 1 Guerra_FlaviaDaRe_M.pdf: 13476510 bytes, checksum: 41684c5bae381807e8d6aada80e83eee (MD5) Previous issue date: 2009
Resumo: Desordens decorrentes de danos ou doencas relacionadas a ATM afetam o aparelho mastigador como um todo e sao caracterizadas como desordens temporomandibulares (DTM). Sabe-se que cerca de sete por cento da populacao mundial requer tratamento para as DTM. Tecidos cartilaginosos, como os que constituem o disco articular da ATM, possuem uma capacidade limitada de regeneracao, e ainda nao existem tecnicas e metodos fidedignos que estimulem o crescimento de um novo tecido, capaz de auxiliar o tratamento de traumas e doencas degenerativas. O tratamento com laser de baixa potencia e uma das terapias utilizadas e, por isto, torna-se imprescindivel o conhecimento de suas acoes sob o ponto de vista celular e tecidual. Para tal, foram utilizados 24 ratos Lewis machos divididos em quatro grupos: GC, grupo controle; grupo GD, animais em que foi administrada a toxina botulinica; grupo GL, animais que receberam o tratamento com o laser de baixa potencia; grupo GDL, animais em que foi administrada a toxina botulinica e em seguida, submetidos a terapia com o laser de baixa potencia. Foi realizada analise morfologica por meio de cortes histologicos corados por HE, AT e picrosirius e; analise bioquimica por meio de eletroforese em gel SDS-poliacrilamida e dosagem de proteinas. Com base nos resultados morfologicos e bioquimicos, conclui-se que o modelo de DTM proposto mostrou-se satisfatorio para estudos desta doenca. Por outro lado, a terapia com o laser deve submeter seus protocolos clinicos a uma reavaliacao, visto que a mesma apresentou resultados controversos do ponto de vista tecidual por ter promovido a sintese de alguns componentes da matriz extracelular e a desestruturacao de outros essenciais ao bom funcionamento da articulacao envolvida.
Abstract: Disorders resulting from injury or disease related to TMJ affect the masticatory apparatus as a whole and are characterized as temporomandibular joint disorder (TMJD). It is known that about seven percent of world population requires treatment for the TMJD. Cartilaginous tissues, such as those that constitute the articular disc of the ATM, have a limited capacity for regeneration, and yet there are no reliable techniques and methods that encourage the growth of a new tissue, capable of assisting the treatment of trauma and degenerative diseases. Treatment with low power laser is one of the therapies used and, therefore, it is essential knowledge of their actions in terms of cellular and tissue. To this end, we used 24 male Lewis rats divided into four groups: GC control group GD animals in that group was given the botulinum toxin; GL group animals that received treatment with low-power laser; GDL animals in that group was given the botulinum toxin and then submitted to the low power laser therapy. Morphological analysis was performed by means of histological sections and stained by HE, and AT and picrosirius; biochemical analysis by electrophoresis in SDSpolyacrylamide gel and determination of proteins. It can be concluded based on morphological and biochemical results, the proposed model of TMD was shown satisfactory for studies of this disease, while treatment with the laser must submit their clinical protocols to a revaluation because it showed controversial results of point of tissue for promoting the synthesis of some components of the extracellular matrix and destruction of other essential for the proper functioning of the joint involved.
Mestrado
Anatomia
Mestre em Biologia Celular e Estrutural
Williams, Elizabeth Jane Bulkeley. "The evolution of genomic anatomy : linkage, expression and rates of evolution." Thesis, University of Bath, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268398.
Full textGiannetti, Nathalie. "Etude anatomo-fonctionnelle de l'organe olfactif septal chez le rat." Lyon 1, 1994. http://www.theses.fr/1994LYO10013.
Full textFragoso, Mariana Franco [UNESP]. "Efeito protetor do açaí (Euterpeoleracea Martius) na promoção da carcinogênese de cólon em ratos Wistar." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/95895.
Full textAçaí, fruto da Euterpe oleraceae Martius, é consumido in natura e em uma variedade de bebidas e alimentos. Esse fruto tem sido bastante consumido e produzido no Brazil, devido à alta popularidade como alimento funcional com capacidade antioxidante e antiinflamatória. Este trabalho investigou o efeito protetor potencial do consumo da polpa de açaí (PA) seca por pulverização na carcinogênese de cólon induzida pela 1,2-dimetilhidrazina (DMH) em ratos Wistar adultos (peso médio de 200g). Após 4 semanas de administração de DMH, os grupos passaram a receber dieta padrão, dieta contendo 2.5% ou 5.0% de PA e 0.2% de N-acetilcisteína (NAC) durante 10 semanas de tratamento para análise de focos de criptas aberrantes (FCA). Adicionalmente, dois grupos receberam dieta padrão e dieta contendo 5.0% de PA durante 20 semanas de tratamento para análise de tumores de cólon. No experimento de 14 semanas, foi observada redução significante no número de criptas aberrantes (CA) e em FCA (1-3 CA) nos grupos que receberam 5.0% de PA e 0.2% de NAC (37% e 47% de inibição, p = 0.036; 37% e 41% de inibição, p = 0.042), respectivamente, quando comparados ao grupo não tratado. No experimento de 24 semanas, foi observada redução no número de adenocarcinomas invasivos e multiplicidade de tumores no grupo que recebeu 5.0% de PA na dieta (p < 0.005 e p = 0.001, respectivamente) quando comparados ao grupo não tratado. Além disso, redução significante na proliferação celular de tumores marcados com Ki-67 e na taxa de crescimento tumoral foi observada no grupo que recebeu 5.0% de PA (p = 0.003 e p = 0.001). Portanto, os resultados desse trabalho indicam que uma dieta acrescida de 5.0% da polpa de açaí seca por pulverização pode reduzir o desenvolvimento de FCA e de tumores de colón induzidos em ratos, indicando seu uso como um potencial alimento funcional
Acai, fruit from Euterpe oleraceae Martius, is consumed in natura and in a variety of beverages and food preparations. This fruit has been widely consumed and produced in Brazil, due to the high popularity as a functional food with antioxidant and anti-inflammatory capacities. This study investigated the potential protective effect of spray-dried açai pulp (AP) intake on colon carcinogenesis induced by 1,2-dimethylhydrazine (DMH) in male adult Wistar rats (mean weight of 200g). After 4 weeks of DMH administration, groups were fed standard diet, diet containing AP at 2.5% or 5.0% or 0.2% N-acetylcysteine (NAC) during 10 weeks for analysis of aberrant crypt foci (ACF) as endpoint. Additionally, two groups were fed standard diet or diet containing AP at 5.0% during 20 weeks for analysis of colon tumor as endpoint. In 14-week ACF assay, a significant reduction in number of aberrant crypt (AC) and in ACF (1-3 AC) were observed in groups fed 5.0% AP and 0.2% NAC (37% and 47% inhibition, p = 0.036; 37% and 41% inhibition, p = 0.042), respectively, when compared to the untreated group. In 24-week tumor assay, a significant reduction in number of invasive adenocarcinomas and tumor multiplicity were observed in group fed 5.0% AP (p < 0.005 and p = 0.001, respectively) when compared to untreated group. Also, significant reduction in tumor Ki-67 cell proliferation and growth index was observed in group fed 5.0% AP (p = 0.003 and p = 0.001). Therefore, the findings of this study indicate that spray-dried açai pulp feeding at 5.0% may reduce the development of chemically-induced ACF and colon tumor in male rats, indicating their use as a potential functional food
Fragoso, Mariana Franco. "Efeito protetor do açaí (Euterpeoleracea Martius) na promoção da carcinogênese de cólon em ratos Wistar /." Botucatu, 2013. http://hdl.handle.net/11449/95895.
Full textBanca: Camila Renata Correa
Banca: Sérgio Britto Garcia
Resumo: Açaí, fruto da Euterpe oleraceae Martius, é consumido in natura e em uma variedade de bebidas e alimentos. Esse fruto tem sido bastante consumido e produzido no Brazil, devido à alta popularidade como alimento funcional com capacidade antioxidante e antiinflamatória. Este trabalho investigou o efeito protetor potencial do consumo da polpa de açaí (PA) seca por pulverização na carcinogênese de cólon induzida pela 1,2-dimetilhidrazina (DMH) em ratos Wistar adultos (peso médio de 200g). Após 4 semanas de administração de DMH, os grupos passaram a receber dieta padrão, dieta contendo 2.5% ou 5.0% de PA e 0.2% de N-acetilcisteína (NAC) durante 10 semanas de tratamento para análise de focos de criptas aberrantes (FCA). Adicionalmente, dois grupos receberam dieta padrão e dieta contendo 5.0% de PA durante 20 semanas de tratamento para análise de tumores de cólon. No experimento de 14 semanas, foi observada redução significante no número de criptas aberrantes (CA) e em FCA (1-3 CA) nos grupos que receberam 5.0% de PA e 0.2% de NAC (37% e 47% de inibição, p = 0.036; 37% e 41% de inibição, p = 0.042), respectivamente, quando comparados ao grupo não tratado. No experimento de 24 semanas, foi observada redução no número de adenocarcinomas invasivos e multiplicidade de tumores no grupo que recebeu 5.0% de PA na dieta (p < 0.005 e p = 0.001, respectivamente) quando comparados ao grupo não tratado. Além disso, redução significante na proliferação celular de tumores marcados com Ki-67 e na taxa de crescimento tumoral foi observada no grupo que recebeu 5.0% de PA (p = 0.003 e p = 0.001). Portanto, os resultados desse trabalho indicam que uma dieta acrescida de 5.0% da polpa de açaí seca por pulverização pode reduzir o desenvolvimento de FCA e de tumores de colón induzidos em ratos, indicando seu uso como um potencial alimento funcional
Abstract: Acai, fruit from Euterpe oleraceae Martius, is consumed in natura and in a variety of beverages and food preparations. This fruit has been widely consumed and produced in Brazil, due to the high popularity as a functional food with antioxidant and anti-inflammatory capacities. This study investigated the potential protective effect of spray-dried açai pulp (AP) intake on colon carcinogenesis induced by 1,2-dimethylhydrazine (DMH) in male adult Wistar rats (mean weight of 200g). After 4 weeks of DMH administration, groups were fed standard diet, diet containing AP at 2.5% or 5.0% or 0.2% N-acetylcysteine (NAC) during 10 weeks for analysis of aberrant crypt foci (ACF) as endpoint. Additionally, two groups were fed standard diet or diet containing AP at 5.0% during 20 weeks for analysis of colon tumor as endpoint. In 14-week ACF assay, a significant reduction in number of aberrant crypt (AC) and in ACF (1-3 AC) were observed in groups fed 5.0% AP and 0.2% NAC (37% and 47% inhibition, p = 0.036; 37% and 41% inhibition, p = 0.042), respectively, when compared to the untreated group. In 24-week tumor assay, a significant reduction in number of invasive adenocarcinomas and tumor multiplicity were observed in group fed 5.0% AP (p < 0.005 and p = 0.001, respectively) when compared to untreated group. Also, significant reduction in tumor Ki-67 cell proliferation and growth index was observed in group fed 5.0% AP (p = 0.003 and p = 0.001). Therefore, the findings of this study indicate that spray-dried açai pulp feeding at 5.0% may reduce the development of chemically-induced ACF and colon tumor in male rats, indicating their use as a potential functional food
Mestre
Normand, Elisabeth. "Les Neurones producteurs d'encéphalines chez l'Escargot et le Rat. Etude anatomo-fonctionnelle par immunocytochimie et hybridation "In situ"." Université de Franche-Comté. UFR des sciences et techniques, 1987. http://www.theses.fr/1987BESA2034.
Full textMoura, Nelci Antunes de [UNESP]. "Efeitos da ingestão de Yacon (Smallanthus sonchifolius) sobre o processo de carcinogênese de cólon induzido pela 1, 2-dimetilhidrazina em ratos wistar." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/87766.
Full textConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Yacon (Smallanthus sonchifolius) é uma raiz originária da região dos Andes que tem se destacado pelos seus compostos bioativos principalmente frutanos como futooligossacarídeos e inulina. O presente projeto teve como objetivo determinar a atividade quimioprotetora da ingestão de Yacon sobre o desenvolvimento de lesões pré-neoplásicas (focos de criptas aberrantes-FCA) induzidas pela dimetilhidrazina (DMH) em ratos Wistar machos. Os animais foram divididos em seis grupos com 5 a 12 animais cada. Os animais dos Grupos 1 a 4 e Grupos 5 e 6 receberam respectivamente, quatro injeções subcutâneas de DMH (40 mg/Kg) e solução de EDTA (veículo da DMH) nas duas semanas iniciais do experimento respectivamente. Os animais receberam ração basal até a sexta semana do experimento e a partir desta os animais dos grupos 2, 3, 4, 5 receberam ração acrescida de extrato de Yacon a 0,5%, 1%, 1% e 1%, respectivamente. Os animais do grupo 4 receberam Lactobacilus casei (2,5 x 1010 de UFC por Kg de ração). O sacrifício ocorreu na vigésima semana de experimento para análise de focos de criptas aberrantes (FCA) e tumores. Nossos resultados mostraram uma redução no número, multiplicidade de FCA e no número de adenocarcinomas invasivos nos grupos tratados com 1% yacon (G3) e na combinação simbiótica (G4), (0,05 < p < 0, 001). A multiplicidade de tumores (invasivos e não invasivos) foi significativamente menor no grupo tratado com a combinação simbiótica (p < 0,02). Observou-se também uma redução significativa nas taxas de proliferação celular tanto em criptas colônicas como em tumores nos grupos tratados com 1% yacon (G3) e na combinação simbiótica (G4), p < 0.001. Os resultados sugerem que a ingestão de extrato de yacon exerce atividade quimiopreventiva contra carcinogênese de cólon
Yacon (Smallanthus sonchifolius) is a tuberous root native to the Andean region of South America which contains high amounts of inulin-type fructans. The present study investigated the beneficial potential of yacon root intake on development of colon carcinogenesis induced by 1,2-dimethylhydrazine (DMH) in male Wistar rats. Six groups were studied: Groups 1–4 were given four s.c. injections of DMH (40 mg/kg b.w.) twice a week, during two weeks, whereas Groups 4 and 5 received similar injections of EDTA solution (DMH vehicle). After 6 weeks of DMH-initiation, groups were fed with basal diet (G1 and G6) or basal diet containing dried extract of yacon root at 0.5% (G2), 1.0% (G3 and G5) or a synbiotic formulation (G4) (1.0% yacon root plus Lactobacillus casei at 2.5 x 1010 CFU per g diet) for 13 weeks. At 20 week, all animals were killed and the colons were analyzed for development of aberrant crypt foci (ACF) and tumor. A significant reduction in number and multiplicity of ACF and in number of invasive adenocarcinomas was observed in the groups orally treated with 1.0% yacon root (G3) or their synbiotic formulation (G4) (0.05 < p < 0.001). Tumor multiplicity (noninvasive plus invasive) was significantly lower solely in group fed with symbiotic formulation (p < 0.02). Also, a reduction in cell proliferation indexes in colonic crypt and tumor were observed in groups orally treated with 1.0% yacon root (G3) or their synbiotic formulation (G4) (p < 0.001). The findings this study suggest that yacon root intake may have potential as chemopreventive agent against colon carcinogenesis
Cunha, Carlo Magenta da. "Anatomia comparada dos músculos extraoculares em raias da ordem Myliobatiformes (Chondrichthyes, Batoidea)." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/10/10132/tde-24042012-104230/.
Full textThe extraocular muscles, responsible for the eye movements in all vertebrates, are classically grouped as four rectus muscles: rectus dorsal muscle, rectus ventral muscle, rectus lateral muscle and rectus medial muscle; and two oblique: oblique dorsal muscle and oblique ventral muscle; however, the description of these groups and their possible association with several species habits is very limited. Hence the objective of this study is to demonstrate the differences and singularities of the extraocular muscles in rays of diverse habitats and habits. This study used four species of rays of the Myliobatiformes order: Mobula thurstoni, pelagic stingray and planktofoga. Pteroplatytrygon violacea, pelagic stingray, predator of fish and squid; Dasyatis hypostigma and Gymnura altavela, both benthonic, predators of small fish and invertebrates. Ten heads of each species were decalcified and dissected to characterize and describe the extraocular muscles. The final results followed, qualitatively and quantitatively, the pattern of extraocular muscles found in vertebrate animals, for P. violacea, D. hypostigma e G. altavela species. But this pattern could not be established for M. thurstoni species because of, instead of two oblique muscles, only one muscle with two origins (biceps) was observed. There were also significant differences of the eye disposition in the chondrocranium; fibers narrowing down and on the place of insertion of oblique muscles near to the insertion point; the crossing position of the rectus medial and ventral muscles with the optical pedicle and the insertion position of the rectus dorsal muscle. Furthermore, this study shows that, distinctively from what has been known so far, the extraocular muscles are not the same for all species and present important anatomical differences that allow grouping the studied species according to their feeding behavior. In face of the obtained results, it is safe to conclude that the extraocular muscles are not \"extraordinarily uniform\" in all vertebrates and provide a range of options to comparative studies to various species that, until now, have had their study of extraocular muscles neglected.
Moura, Nelci Antunes de. "Efeitos da ingestão de Yacon (Smallanthus sonchifolius) sobre o processo de carcinogênese de cólon induzido pela 1, 2-dimetilhidrazina em ratos wistar /." Botucatu, 2012. http://hdl.handle.net/11449/87766.
Full textBanca: Luís Antônio Justulim Júnior
Banca: Carlos Eduardo Andrade Chagas
Resumo: Yacon (Smallanthus sonchifolius) é uma raiz originária da região dos Andes que tem se destacado pelos seus compostos bioativos principalmente frutanos como futooligossacarídeos e inulina. O presente projeto teve como objetivo determinar a atividade quimioprotetora da ingestão de Yacon sobre o desenvolvimento de lesões pré-neoplásicas (focos de criptas aberrantes-FCA) induzidas pela dimetilhidrazina (DMH) em ratos Wistar machos. Os animais foram divididos em seis grupos com 5 a 12 animais cada. Os animais dos Grupos 1 a 4 e Grupos 5 e 6 receberam respectivamente, quatro injeções subcutâneas de DMH (40 mg/Kg) e solução de EDTA (veículo da DMH) nas duas semanas iniciais do experimento respectivamente. Os animais receberam ração basal até a sexta semana do experimento e a partir desta os animais dos grupos 2, 3, 4, 5 receberam ração acrescida de extrato de Yacon a 0,5%, 1%, 1% e 1%, respectivamente. Os animais do grupo 4 receberam Lactobacilus casei (2,5 x 1010 de UFC por Kg de ração). O sacrifício ocorreu na vigésima semana de experimento para análise de focos de criptas aberrantes (FCA) e tumores. Nossos resultados mostraram uma redução no número, multiplicidade de FCA e no número de adenocarcinomas invasivos nos grupos tratados com 1% yacon (G3) e na combinação simbiótica (G4), (0,05 < p < 0, 001). A multiplicidade de tumores (invasivos e não invasivos) foi significativamente menor no grupo tratado com a combinação simbiótica (p < 0,02). Observou-se também uma redução significativa nas taxas de proliferação celular tanto em criptas colônicas como em tumores nos grupos tratados com 1% yacon (G3) e na combinação simbiótica (G4), p < 0.001. Os resultados sugerem que a ingestão de extrato de yacon exerce atividade quimiopreventiva contra carcinogênese de cólon
Abstract: Yacon (Smallanthus sonchifolius) is a tuberous root native to the Andean region of South America which contains high amounts of inulin-type fructans. The present study investigated the beneficial potential of yacon root intake on development of colon carcinogenesis induced by 1,2-dimethylhydrazine (DMH) in male Wistar rats. Six groups were studied: Groups 1-4 were given four s.c. injections of DMH (40 mg/kg b.w.) twice a week, during two weeks, whereas Groups 4 and 5 received similar injections of EDTA solution (DMH vehicle). After 6 weeks of DMH-initiation, groups were fed with basal diet (G1 and G6) or basal diet containing dried extract of yacon root at 0.5% (G2), 1.0% (G3 and G5) or a synbiotic formulation (G4) (1.0% yacon root plus Lactobacillus casei at 2.5 x 1010 CFU per g diet) for 13 weeks. At 20 week, all animals were killed and the colons were analyzed for development of aberrant crypt foci (ACF) and tumor. A significant reduction in number and multiplicity of ACF and in number of invasive adenocarcinomas was observed in the groups orally treated with 1.0% yacon root (G3) or their synbiotic formulation (G4) (0.05 < p < 0.001). Tumor multiplicity (noninvasive plus invasive) was significantly lower solely in group fed with symbiotic formulation (p < 0.02). Also, a reduction in cell proliferation indexes in colonic crypt and tumor were observed in groups orally treated with 1.0% yacon root (G3) or their synbiotic formulation (G4) (p < 0.001). The findings this study suggest that yacon root intake may have potential as chemopreventive agent against colon carcinogenesis
Mestre
Figueiredo, Cairo Faleiros de. "Anatomia e identificação macroscópica das lianas da Reserva Florestal do Instituto de Biociências da Universidade de São Paulo, São Paulo-SP, Brasil." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-23012012-110851/.
Full textThere is a need for techniques for accurate identification of species of lianas in forest formations of São Paulo, to allow the implementation of conservation and ecosystem management. This study aimed at creating mechanisms for efficient and rapid anatomical identification of the wood of vines. For this pupouse it was collected and described anatomically 54 lianas species belonging to 19 families that occurs in the Reserva do Instituto de Biociências da USP forest. With the anatomical descriptions, organoleptic characteristics and variations in the formation of tissues (cambial variants), it was possible to create multiple entry keys and electronic keys that enable the identification of individuals to the species level. These keys have targeted the use of simple tools such as hand lens of 10 increases. Thus were created products that allow a quick and easy identification of vines using only parts of the stem.These products can be used both in field and laboratory and also in dry or fresh. The work presented here has also developed a GUI Identification of Lianas occurring in the forest reserve of the Institute of Biosciences of USP with boards that show detailed iconographic aspects of the anatomy of lianas. It was concluded that using large groups of the above features together can create tools extremely useful in areas with previously inventoried the flora.
Pazos, López Marta. "Rat optic nerve head anatomy within three- dimensional histomorphometric reconstructions of normal and early experimental glaucoma eyes." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/381080.
Full textObjetivo: Reconstruir en 3D cabezas del nervio óptico (CNOs) de rata con glaucoma experimental (GExp) precoz unilateral, para proporcionar la primera descripción histomorfométrica de la CNO de controles normales y GExp precoz en esta especie. Métodos: Se inyectó suero salino hipertónico unilaterlamente en las venas epiesclerales de 8 ratas noruegas que se sacrificaron 4 semanas después (fijación-perfusión). Cinco observadores enmascarados graduaron el daño de secciones del nervio óptico (NO) orbitario (1 Normal-5 Extenso). Se reconstruyeron en 3D, se visualizaron, delinearon y parametrizaron las CNOs junto con la esclera peripapilar. Los parámetros globales y específicos por ojo fueron evaluados conjuntamente y regionalmente con un modelo de efectos lineares mixtos con criterios de significación ajustados para comparaciones múltiples. Resultados: La CNO de la rata consiste en 2 aperturas esclerales (una superior neurovascular y otra inferior arterial) separados por una cincha escleral. Dentro de la apertura superior, el nervio se apoya en una prominente extensión de la Membrana de Bruch’s (MB) superiormente y está rodeado de un plexo vascular. El NO y la Apertura Anterior del Canal Escleral (ASCO) se expandieron significativamente en 7 de 8 ojos con GExp. En al menos 5 ojos con GExp se detectaron expansiones significativas de la apertura de la MB (BMO) (3-10%), de la ASCO y de la Apertura Posterior del Canal Escleral (PSCO) (8-21% y 8-41% resp.). La expansión del NO se correlacionó significativamente con el grado de daño (R2=0.668, p<0.05). Conclusiones: La complejidad 3D de la CNO de rata y el grado en el que se diferencia de la del primate han sido infravalorados en los estudios previos en 2D. En la CNO de rata, el NO, el BMO que lo rodea y el canal neurovascular se expanden de manera temprana en respuesta a la elevación experimental crónica de PIO. Estos hallazgos proporcionan nuevos puntos de referencia y objetivos de imagen para detectar el desarrollo de la neuropatía glaucomatosa experimental en ojos de rata.
Purpose: To Three-Dimensionally (3D) reconstruct rat optic nerve heads (ONHs) with varying stages of unilateral early experimental glaucoma (EG), so as to provide the first histomorphometrical description of nomal controls and early EG ONH anatomy in this species. Methods: Hypertonic saline was unilaterally injected into the episcleral veins of 8 Brown Norway rats and animals were sacrificed 4 weeks later by perfusion fixation. Orbital optic nerve (ON) crosssections from were graded (1 normal, 5 extensive injury) by 5 masked observers. ONH’s with peripapillary ONH sclera were 3D reconstructed, visualized, delineated, and parameterized. Overall and animal-especific EG versus control eye ONH parameters differences were assessed globally and regionally by linear mixed effect models with significance criteria adjusted for multiple comparisons. Results: The rat ONH consists of 2 scleral openings (a superior neurovascular and inferior arterial) separated by a scleral sling. Within the superior opening, the nerve abuts a prominent extension of Bruch’s Membrane (BM) superiorly and is surrounded by a vascular plexus. Expansions of the ON and anterior scleral canal opening (ASCO) achieved statistical significance overall and in 7 of 8 EG eyes. In at least 5 EG eyes, significant expansions in Bruch’s Membrane Opening (BMO) (3-10%), the ASCO and Posterior Scleral Canal Openings (PSCOs) (8-21% and 8-41%, respectively) were detected. ON expansion was significantly correlated to ON damage (R2=0.668, p<0.05). Conclusions: The 3D complexity of the rat ONH and the extent to which it differs from the primate have been under-appreciated within previous 2D studies. In the rat ONH, the ON ansd surrounding BMO and neurovascular canal expand early in their response to chronic experimental IOP elevation. These findings provide phenotypic landmarks and imaging targets for detecting the development of EG optic neuropathy in the rat eye.
Jornada, Daniela Hartmann. "Efeito da associação da taurina e do 5-fluorouracil em câncer de cólon induzido por DMH. Planejamento e síntese de pró-fármacos derivados /." Araraquara, 2018. http://hdl.handle.net/11449/157230.
Full textCoorientador: Cleverton Roberto de Andrade
Banca: Luiz Fernando Takase
Banca: Cíntia Duarte de Freitas Milagre
Banca: Renato Farina Menegon
Banca: Jean Leandro dos Santos
Resumo: O câncer colorretal (CCR) é um dos 10 tipos de câncer mais incidentes no Brasil. A terapia consiste na remoção cirúrgica e em alguns casos, a quimioterapia adjuvante, composta de 5-fluorouracil e outros fármacos associados. O 5-FU, apesar de amplamente utilizado, provoca uma série de efeitos adversos, relacionados à toxicidade renal, cardíaca, hepática e mucosite. Nesse contexto, a ferramenta do planejamento de pró fármacos é uma alternativa para a redução das propriedades indesejadas dos fármacos. Assim, o objetivo deste trabalho foi comprovar a hipótese da diminuição da toxicidade do 5-FU pela taurina, aminoácido com propriedades anti-inflamatórias e antioxidante, para a obtenção de pró-fármacos derivados. Para isso, ratos Wistar foram submetidos ao modelo de carcinogênese de cólon induzida por1,2-dimetilhidrazina (DMH), e tratados com a associação (5-FU+TAU) por 8 dias, na 20° semana pós indução. Os resultados demonstraram que a taurina inibe a formação de criptas aberrantes e atua sinergicamente com 5-FU reduzindo a quantidade das mesmas. Além disso, o grupo tratado com 5-FU isolado apresentou aumento de 28% no número de tumores, enquanto a TAU isolada promoveu 64% menos neoplasias que o controle. Na associação a redução na incidência alcança 86%, sendo nenhuma das neoplasias classificados como adenocarcinomas (tumor invasivo), enquanto TAU isolada apresenta 50%, e 5-FU 70% de adenocarcinomas entre as neoplasias. Os resultados demonstram que a TAU e o 5-FU apresentam efei... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Colorectal cancer is one of the ten most incident types of cancer in Brazil. Its treatment consists of surgical intervention and, in some cases, adjuvant chemotherapy, using 5-fluorouracil (5-FU) associated with other drugs. Although extensively used, 5-FU presents several adverse effects, related to renal, cardiac and hepatic toxicity and mucositis. In this context, the search of new drugs is an alternative to reduce some undesired properties of the drug. Thus, the objective of this work was to prove the hypothesis of the reduction of toxicity of 5-FU by taurine, amino acid with anti-inflammatory and antioxidant properties, to obtain derivative prodrugs. For this, Wistar rats were submitted to the colon carcinogenesis model induced by 1,2-dimethylhydrazine (DMH) and treated with the combination (5-FU + TAU) for 8 days at the 19th week post induction. The results have demonstrated that taurine inhibits the formation of aberrant crypts foci and acts synergistically with 5-FU. In addition, the group treated with 5-FU alone showed a 28% increase in the number of tumors, whereas the isolated TAU promoted 64% fewer neoplasms than the control. In the association, the reduction in incidence reaches 86%, none of the neoplasms classified as adenocarcinomas (invasive tumor), while isolated TAU presents 50%, and 5-FU 70% of adenocarcinomas between neoplasms. Thus, the association results have demonstrated that the two substances presented a chemotherapic effect and can be used to obtent... (Complete abstract click electronic access below)
Doutor
Poulat, Philippe. "Innervation sérotonergique et peptidergique de la colonne intermédiolatérale de la moe͏̈lle épinière du rat : anatomie et plasticité." Montpellier 2, 1991. http://www.theses.fr/1991MON20166.
Full textRavel, Nadine. "Le système cholinergique afférent au bulbe olfactif : approche anatomo-fonctionnelle chez le rat." Lyon 1, 1988. http://www.theses.fr/1988LYO10039.
Full text