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1
Eguchi, M., T. Ozawa, J. Suda, K. Sugita i T. Furukawa. "Lectins for electron microscopic distinction of eosinophils from other blood cells." Journal of Histochemistry & Cytochemistry 37, nr 5 (maj 1989): 743–49. http://dx.doi.org/10.1177/37.5.2703708.
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Colloidal gold-labeled soybean agglutinin (SBA), Helix pomatia agglutinin (HPA), Dolichos biflorus agglutinin (DBA), and Griffonia simplicifolia lectin (GS-1) were used for electron microscopic observation of blood cells. Colloidal gold-labeled SBA, HPA, and DBA showed marked deposition on eosinophil granules at all stages of maturation. Gold particles were not deposited on basophils, neutrophils, monocytes, lymphocytes, or other blood cells. Only a few colloidal gold-labeled GS-1 were deposited on eosinophil granules. Eosinophil granules are rich in N-acetyl-D-galactosamine compounds, and the colloidal gold-labeled SBA, HPA, and DBA are useful for electron microscopic detection of eosinophil granules.
2
Ebell, W., H. Castro-Malaspina, MA Moore i RJ O'Reilly. "Depletion of stromal cell elements in human marrow grafts separated by soybean agglutinin". Blood 65, nr 5 (1.05.1985): 1105–11. http://dx.doi.org/10.1182/blood.v65.5.1105.bloodjournal6551105.
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We report studies demonstrating the presence on human marrow stromal cells of binding sites for the soybean lectin (SBA). Marrow cells were separated by agglutination with SBA into an agglutinated cell (SBA+) fraction containing most mature hemic cells including T lymphocytes, and an unagglutinated cell (SBA-) fraction containing the hematopoietic stem cells. The vast majority of fibroblast colony-forming units (CFU- F) (97.2% +/- 1.1%) were in the SBA+ fraction. Mixing experiments using SBA+ and SBA- cells excluded the possibility that these results were caused by an unequal distribution of accessory cells having a regulatory effect on CFU-F growth. In the heterogeneous adherent layers of long-term marrow cultures derived from SBA+ and SBA- cells, endothelial cells, and adipocytes were found almost exclusively in cultures of SBA+ marrow cells. Immunofluorescence studies with fluorescein-labeled SBA revealed the staining of cultured marrow fibroblasts. This staining was inhibited by D-galactose, which is the sugar that specifically binds to SBA. Staining of marrow-derived heterogeneous adherent layers with fluorescein-labeled SBA demonstrated that cultured endothelial cells (identified by rhodamine-labeled antibodies against factor VIII-associated protein) and early adipocytes also had surface glycoproteins binding SBA, although its density on the latter cells was much less important. Thus, our data indicate that human marrow grafts processed with soybean lectin to remove T cells are also depleted of the cellular components of the marrow stroma.
3
Ebell, W., H. Castro-Malaspina, MA Moore i RJ O'Reilly. "Depletion of stromal cell elements in human marrow grafts separated by soybean agglutinin". Blood 65, nr 5 (1.05.1985): 1105–11. http://dx.doi.org/10.1182/blood.v65.5.1105.1105.
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Abstract We report studies demonstrating the presence on human marrow stromal cells of binding sites for the soybean lectin (SBA). Marrow cells were separated by agglutination with SBA into an agglutinated cell (SBA+) fraction containing most mature hemic cells including T lymphocytes, and an unagglutinated cell (SBA-) fraction containing the hematopoietic stem cells. The vast majority of fibroblast colony-forming units (CFU- F) (97.2% +/- 1.1%) were in the SBA+ fraction. Mixing experiments using SBA+ and SBA- cells excluded the possibility that these results were caused by an unequal distribution of accessory cells having a regulatory effect on CFU-F growth. In the heterogeneous adherent layers of long-term marrow cultures derived from SBA+ and SBA- cells, endothelial cells, and adipocytes were found almost exclusively in cultures of SBA+ marrow cells. Immunofluorescence studies with fluorescein-labeled SBA revealed the staining of cultured marrow fibroblasts. This staining was inhibited by D-galactose, which is the sugar that specifically binds to SBA. Staining of marrow-derived heterogeneous adherent layers with fluorescein-labeled SBA demonstrated that cultured endothelial cells (identified by rhodamine-labeled antibodies against factor VIII-associated protein) and early adipocytes also had surface glycoproteins binding SBA, although its density on the latter cells was much less important. Thus, our data indicate that human marrow grafts processed with soybean lectin to remove T cells are also depleted of the cellular components of the marrow stroma.
4
Abrosimov, Yu Yu. "FEATURES OF DISTRIBUTION OF SOYBEAN AGGLUTININ (SBA) RECEPTORS IN THE EXTRACELLULAR MATRIX OF THE MENISCI OF RAT KNEE JOINT AFTER INTRAFETAL INJECTION OF ANTIGENS". Biological Markers in Fundamental and Clinical Medicine (collection of abstracts) 3, nr 1 (7.11.2019): 61–63. http://dx.doi.org/10.29256/v.03.01.2019.escbm40.
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Ito, N., K. Nishi, M. Nakajima, A. Ishitani, Y. Okamura, Y. Matsuda i T. Hirota. "Histochemical reactivity of soybean agglutinin with blood group antigens and their precursor substances in acinar cells of human pancreas." Journal of Histochemistry & Cytochemistry 35, nr 8 (sierpień 1987): 881–90. http://dx.doi.org/10.1177/35.8.2955034.
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In human pancreas, soybean agglutinin (SBA) conjugated to horseradish peroxidase reacted with the acinar cells secreting blood group A and/or H antigen, but not with those secreting only B antigen. For detailed histochemical characterization of SBA staining, the effects of treatment with unlabeled lectins and of digestion of certain enzymes on SBA staining were investigated in formalin-fixed, paraffin-embedded pancreatic tissue from individuals of different blood groups. Pre-incubation of sections with unlabeled Dolichos biflorus agglutinin to block A antigen eliminated subsequent SBA staining in the cells secreting A antigen, although failing to induce any effects in those secreting H antigen. In contrast, pre-incubation with unlabeled Ulex europaeus agglutinin-I (UEA-I) to block H antigen abolished SBA staining in cells secreting H antigen but not in those secreting A antigen. Treatment with galactose oxidase yielded the same results as those with unlabeled UEA-I, i.e., SBA reactivity was significantly diminished in cells secreting H antigen but not in those secreting A antigen. Digestion with beta-galactosidase resulted in a slight decrease of SBA staining in the cells secreting H antigen. Accompanying the decrease of SBA staining, reactivity with Griffonia simplicifolia agglutinin-II (GSA-II) appeared for the first time in the enzyme-susceptible, SBA-reactive cells secreting H antigen. Pre-treatment with galactose oxidase abolished this effect of beta-galactosidase. The GSA-II reactivity disclosed by treatment with galactosidase was completely eliminated by digestion with beta-N-acetylhexosaminidase, indicating that GSA-II staining after digestion with galactosidase is due to exposed penultimate beta-N-acetyl-D-glucosamine residues. These results demonstrate that at least two substances react with SBA in acinar cells of human pancreas, one being terminal beta-N-acetyl-D-galactosamine residues of A antigen, and the other being terminal beta-D-galactose-(1----3 or 1----4)-beta-N-acetyl-D-glucosamine dimers in the precursor of blood group H antigen. Such dimers may exist in close proximity to L-fucose residues of H antigen, since unlabeled UEA-I blocked SBA staining.
6
Sawyer, J. T., i R. A. Akeson. "Differential redistribution of lectin receptor classes on clonal rat myotubes and myoblasts". Journal of Cell Science 83, nr 1 (1.07.1986): 181–96. http://dx.doi.org/10.1242/jcs.83.1.181.
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To evaluate the relative mobilities of cell surface glycoconjugates during myogenesis we have studied the redistribution of fluorescein-conjugated plant lectins on L6 rat myogenic cells. Previous experiments had demonstrated that the receptors for the lectins soybean agglutinin (SBA), wheat germ agglutinin, concanavalin A and Lens culinaris agglutinin all were relatively uniformly distributed on both myoblasts and myotubes, and that SBA receptors were capable of rapid redistribution on myotubes but not myoblasts at 4 degrees C (Sawyer & Akeson, 1983). Here we show that when SBA-labelled myoblasts are incubated at 37 degrees C, or for extended times at 4 degrees C, the lectin aggregates as on myotubes. So it appears that SBA-binding components show a quantitative rather than qualitative change in their mobility during L6 differentiation. In addition, the redistribution of the three other lectins on myoblasts and myotubes was either less prominent (i.e. showing fewer apparent surface clusters) or occurred less rapidly than with SBA. None of these three lectins showed striking differences in mobility between myoblasts and myotubes. Thus, it appears that SBA binds to a subset of surface glycoconjugates that is relatively highly mobile, and that this mobility is specifically enhanced with differentiation.
7
Suzaki, E., i K. Kataoka. "Lectin cytochemistry in the gastrointestinal tract with special reference to glycosylation in the Golgi apparatus of Brunner's gland cells." Journal of Histochemistry & Cytochemistry 40, nr 3 (marzec 1992): 379–85. http://dx.doi.org/10.1177/40.3.1552177.
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Two hydrophilic, low temperature-embedding resins, Lowicryl K4M and LR White, were compared in lectin cytochemistry. Post-embedding staining of colloidal gold-labeled Griffonia symplicifolia agglutinin II (GSA-II) resulted in staining of the Golgi apparatus and mucous granules of mucous neck cells in the gastric fundic gland, pylorocytes, and Brunner's gland cells embedded in either resin, although it was much easier to make ultra-thin sections with LR White-embedded material than with the other. Post-fixation with uranyl acetate followed by LR White embedding improved general ultrastructure so that lectin binding sites were identified precisely. All examined lectins, soybean agglutinin (SBA), Maclura pomifera agglutinin (MPA), GSA-II, and Ulex europaeus agglutinin I (UEA-I), stained mucous granules and the Golgi apparatus, in which the staining pattern was characteristic of each lectin: cis cisternae were labeled with SBA and MPA, intermediate cisternae with GSA-II, and trans cisternae and mucous granules with SBA, GSA-II, UEA-I, and lightly with MPA. No labeling was observed in the rough endoplasmic reticulum with any lectin. These findings suggest that the Golgi apparatus is the site of O-linked glycosylation and can be divided into at least three distinct compartments with regard to the glycosylation.
8
Gallagher, Betty C. "Basal laminar thinning in branching morphogenesis of the chick lung as demonstrated by lectin probes". Development 94, nr 1 (1.06.1986): 173–88. http://dx.doi.org/10.1242/dev.94.1.173.
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Three lectins, wheat germ agglutinin (WGA), soybean agglutinin (SBA) and Ricinis communis agglutinin I (RCA), were used to study the basement membrane of developing chick lungs. Thinning of the basement membrane at the tips of newly formed bronchi was visualized with all three lectins, but was particularly evident using SBA. Control sections established the ability of the lectins to stain hyaluronic acid and chondroitin sulphate. Neuraminidase, bovine testes hyaluronidase and Streptomyces hyaluronidase removed some of the staining, but none were able to affect the staining of the basement membrane. Possible explanations for this are discussed in the text. Incorporation of [3H]thymidine is enhanced at the tips relative to the interbud area in stage-30 lungs, extending previous studies on stage-26 lungs. Evidence has been presented here which demonstrates that mechanisms of morphogenesis used in avian embryos are similar to those already elucidated in work on mammalian embryos.
9
Swamy, Musti Joginadha, i Avadhesha Surolia. "Studies on the tryptophan residues of soybean agglutinin. Involvement in saccharide binding". Bioscience Reports 9, nr 2 (1.04.1989): 189–98. http://dx.doi.org/10.1007/bf01115995.
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Modification of tryptophan side chains of soybean agglutinin (SBA) with N-bromosuccinimide results in a loss of the hemagglutinating and carbohydrate binding activities of the protein. One residue/subunit is probably essential for the binding activity. Modification leads to a large decrease in the fluorescene of the protein accompained by a blue shift. Iodide ion quenching of the protein fluorescence shows that saccharide binding results in a decreased accessibility of some of the tryptophan side chains. These results strongly point towards the involvement of tryptophan residues in the active site of SBA.
10
Knowles, B. H., i D. J. Ellar. "Characterization and partial purification of a plasma membrane receptor for Bacillus thuringiensis var. kurstaki lepidopteran-specific delta-endotoxin". Journal of Cell Science 83, nr 1 (1.07.1986): 89–101. http://dx.doi.org/10.1242/jcs.83.1.89.
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The lepidopteran-specific P1 delta-endotoxin of Bacillus thuringiensis var. kurstaki HD-1 was activated in vitro using insect gut proteases and found to be highly specific for the lepidopteran cell line Choristoneura fumiferana CF1 among a wide range of lepidopteran and dipteran cell lines tested. The toxicity of P1 against CF1 cells is inhibited by N-acetylgalactosamine (GalNAc), and the lectins soybean agglutinin (SBA) and wheat-germ agglutinin. Protein blotting was used to identify a glycoprotein of 146 X 10(3) Mr in the plasma membrane of CF1 cells, capable of binding both the toxin and SBA, which is specific for GalNAc. This glycoprotein was labelled using galactose oxidase and sodium boro-[3H]hydride and solubilized in Triton X-100 before partial purification by affinity chromatography on SBA-agarose. We propose that this glycoprotein is a good candidate for the cellular receptor of the lepidopteran-specific P1 delta-endotoxin of B. thuringiensis var. kurstaki HD-1.
11
Fàbrega, Anna, Marta Puigmulé, Jean-Louis Dacheux, Sergi Bonet i Elisabeth Pinart. "Glycocalyx characterisation and glycoprotein expression of Sus domesticus epididymal sperm surface samples". Reproduction, Fertility and Development 24, nr 4 (2012): 619. http://dx.doi.org/10.1071/rd11064.
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The sperm surface is covered with a dense coating of carbohydrate-rich molecules. Many of these molecules are involved in the acquisition of fertilising ability. In the present study, eight lectins (i.e. Arachis hypogae (peanut) agglutinin (PNA), Lens culimaris (lentil) agglutinin-A (LCA), Pisum sativum (pea) agglutin (PSA), Triticum vulgari (wheat) germ agglutinin (WGA), Helix pomatia agglutinin (HPA), Phaseolus vulgaris (red kidney bean) leucoagglutinin (PHA-L), Glycine max (soybean) agglutinin (SBA) and Ulex europaeus agglutinin I (UEA-I)) were investigated to identify changes in the nature and localisation of glycoproteins in boar spermatozoa migrating along the epididymal duct. Complementary procedures included measurement of global lectin binding over the surface of the viable sperm population by flow cytometry, analysis of lectin localisation on the membrane of individual spermatozoa using fluorescence microscopy and the electrophoretic characterisation of the major sperm surface glycoprotein receptors involved in lectin binding. A significant increase was found in sperm galactose, glucose/mannose and N-acetyl-d-glucosamine residues distally in the epididymis. Moreover, the sperm head, cytoplasmic droplet and midpiece were recognised by most of the lectins tested, whereas only HPA and WGA bound to the principal piece and end piece of the sperm tail. Fourteen sperm surface proteins were observed with different patterns of lectin expression between epididymal regions. The sperm glycocalyx modifications observed in the present study provide an insight into the molecular modifications associated with epididymal maturation, which may be correlated with the degree of maturation of ejaculated spermatozoa.
12
Metcalf, T. N., M. A. Villanueva, M. Schindler i J. L. Wang. "Monoclonal antibodies directed against protoplasts of soybean cells: analysis of the lateral mobility of plasma membrane-bound antibody MVS-1." Journal of Cell Biology 102, nr 4 (1.04.1986): 1350–57. http://dx.doi.org/10.1083/jcb.102.4.1350.
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A monoclonal antibody (MVS-1) was used to monitor the lateral mobility of a defined component (Mr approximately 400,000) of the plasma membrane of soybean protoplasts prepared from suspension cultures of Glycine max (SB-1 cell line). The diffusion coefficient (D) of antibody MVS-1 bound to its target was determined (D = 3.2 X 10(-10) cm2/s) by fluorescence redistribution after photobleaching. Pretreatment of the protoplasts with soybean agglutinin (SBA) resulted in a 10-fold reduction of the lateral mobility of antibody MVS-1 (D = 4.1 X 10(-11) cm2/s). This lectin-induced modulation could be partially reversed by prior treatment of the protoplasts with either colchicine or cytochalasin B. When used together, these drugs completely reversed the modulation effect induced by SBA. These results have refined our previous analysis of the effect of SBA on receptor mobility to the level of a defined receptor and suggest that the binding of SBA to the plasma membrane results in alterations in the plasma membrane such that the lateral diffusion of other receptors is restricted. These effects are most likely mediated by the cytoskeletal components of the plant cell.
13
Fujino, T., i B. Fried. "Echinostoma caproni and E. trivolvis alter the binding of glycoconjugates in the intestinal mucosa of C3H mice as determined by lectin histochemistry". Journal of Helminthology 67, nr 3 (wrzesień 1993): 179–88. http://dx.doi.org/10.1017/s0022149x00013110.
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AbstractMouse (C3H) mucosal glycoconjugates were examined in normal small intestines and intestines infected with Echinostoma caproni, or E. trivolvis using six different fluorescein-conjugated lectins: Triticum, vulgaris agglutinin (WGA), Ulex europaeus agglutinin I (UEA-I), Ricinus communis agglutinin I (RCA-I). Glycine max soybean agglutinin (SBA), Dolichos biflorus agglutinin (DBA), and Arachis hypogaeu peanut agglutinin (PNA). The expression of lectin-binding sites and the intensity of the binding of lectins in the mouse small intestines were changed by infection with the echinostomes. Specific differences in the reaction to glycoproteins were clearly observed between the mouse intestines infected with E. caproni and those infected with E. trivolvis. In E. caproni infection, binding of most of the lectins to the villi was remarkably reduced in accord with the villous atrophy and loss of goblet cells. In contrast, in E. trivolvis infection, the binding of WGA, RCA-I and DBA was reduced in the microvillar surfaces, but binding of UEA-I and SBA were unchanged compared to the control intestines. The lectin binding to goblet cells in E. trivolvis-infected mice mostly increased. These observations may reflect the marked increase in goblet cells and the less severe damage in the villi of E. trivolvis infection compared to E. caproni infection. Most of the glycoconjugates were slightly reduced in the hyperplastic crypts except for N-acetyl glucosamine. It is possible that glucose metabolism in the host intestines infected with E. trivolvis was activated. resulting in an increase in the rate of mucin synthesis as well as qualitative changes in mucus, thereby mediating the expulsion of the worms.
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Menco, Bert Ph M. "Lectins bind differentially to rat olfactory and nasal respiratory cilia and microvilli: A rapid-freeze freeze-substitution lowicryl K11M embedding and deep-etch study". Proceedings, annual meeting, Electron Microscopy Society of America 48, nr 3 (12.08.1990): 542–43. http://dx.doi.org/10.1017/s0424820100160261.
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Olfactory cilia have membranes that contain odorant receptors and an apparatus to transduce the odorous message into a code comprehensible to the rest of the cell and the brain. Membranes of these cilia have a variety of cellsurface proteins to do this. Ultrastructural freeze-fracture and freeze-etch studies have implied that this is really true. Biochemical and electrophysiological studies on olfactory epithelia with lectins have suggested that a major part of these proteins are glycoproteins. Therefore, binding of colloidal-gold conjugated lectins was studied in cilia and microvilli of rat olfactory with cilia and microvilli of nasal respiratory epithelial surfaces as comparison. This was done in sections of rapidly-frozen, freeze-substituted specimens embedded in Lowicryl K11M or, for wheat germ agglutinin ( WGA) alone, in deep-etched replicas. Olfactory dendritic endings and cilia labeled with WGA and, faintly, with soybean agglutinin (SBA); olfactory supporting-celi microvilli bound only Dolichos biflorus agglutinin (DBA). Microvilli of an infrequent cell bound peanut agglutinin (PNA), SBA, and WGA. Relative to olfactory cilia these microvilli labeled more strongly with the last two lectins. The cell resembles a presumptive sensory oneR. Cilia of nasal respiratory cells bound WGA and, somewhat more weakly, PNA; microvilli of respiratory cells bound all four lectins. In respiratory ciliated cells cilia and microvilli of the same cell type showed a quite different pattern of labeling.
15
Shang, Kun, Siyu Song, Yaping Cheng, Lili Guo, Yuxin Pei, Xiaomeng Lv, Teodor Aastrup i Zhichao Pei. "Fabrication of Carbohydrate Chips Based on Polydopamine for Real-Time Determination of Carbohydrate–Lectin Interactions by QCM Biosensor". Polymers 10, nr 11 (16.11.2018): 1275. http://dx.doi.org/10.3390/polym10111275.
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A novel approach for preparing carbohydrate chips based on polydopamine (PDA) surface to study carbohydrate–lectin interactions by quartz crystal microbalance (QCM) biosensor instrument has been developed. The amino-carbohydrates were immobilized on PDA-coated quartz crystals via Schiff base reaction and/or Michael addition reaction. The resulting carbohydrate-chips were applied to QCM biosensor instrument with flow-through system for real-time detection of lectin–carbohydrate interactions. A series of plant lectins, including wheat germ agglutinin (WGA), concanavalin A (Con A), Ulex europaeus agglutinin I (UEA-I), soybean agglutinin (SBA), and peanut agglutinin (PNA), were evaluated for the binding to different kinds of carbohydrate chips. Clearly, the results show that the predicted lectin selectively binds to the carbohydrates, which demonstrates the applicability of the approach. Furthermore, the kinetics of the interactions between Con A and mannose, WGA and N-Acetylglucosamine were studied, respectively. This study provides an efficient approach to preparing carbohydrate chips based on PDA for the lectin–carbohydrate interactions study.
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Asaga, H., i K. Yoshizato. "Recognition of collagen by fibroblasts through cell surface glycoproteins reactive with Phaseolus vulgaris agglutinin". Journal of Cell Science 101, nr 3 (1.03.1992): 625–33. http://dx.doi.org/10.1242/jcs.101.3.625.
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The role of glycochains of cell surface glycoproteins in the cell to collagen interaction was examined by studying the effect of lectins on the fibroblast-mediated collagen gel contraction. Lectins of Phaseolus vulgaris agglutinin (PHA), concanavalin A (ConA), lentil seed agglutinin (LCA), pea agglutinin (PSA), Ricinus communis agglutinin-60 (RCA), and wheat germ agglutinin (WGA) dose-dependently inhibited gel contraction, while lectins of mushroom agglutinin (ABA), peanut agglutinin (PNA), pokeweed mitogen (PWM), and soybean agglutinin (SBA) did not. Of these lectins, PHA seemed to be worthy of further analysis, because PHA, but not other lectins, inhibited spreading of fibroblasts on collagen fibrils but not on plastic or gelatin, suggesting that cell-surface glycoproteins responsive to the lectin are involved in the specific binding of fibroblasts to native collagen fibrils. The inhibitory effect of PHA-E4, an isolectin of PHA, was more intense than that of PHA-L4, another isolectin of PHA. The collagen gel contraction was also inhibited by tunicamycin and monensin in a concentration-dependent and reversible manner. These results strongly suggest that PHA-E4-reactive glycoproteins of the fibroblast surface play an important role in cell to collagen binding during the gel contraction. Five membrane proteins including beta 1 subunits of the integrin family were obtained by affinity chromatography with PHA-E4.
17
Alroy, J., A. A. Ucci, V. Goyal i W. Woods. "Lectin histochemistry of glycolipid storage diseases on frozen and paraffin-embedded tissue sections." Journal of Histochemistry & Cytochemistry 34, nr 4 (kwiecień 1986): 501–5. http://dx.doi.org/10.1177/34.4.3081625.
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Lectin histochemical studies were performed on frozen and paraffin-embedded brain tissue sections from six cases of galactosylceramide lipidosis (i.e., globoid cell leukodystrophy, or Krabbe's disease) in Twitcher mice and one case of canine infantile GM1-gangliosidosis. The globoid cells in Krabbe's disease stained with Ricinus communis agglutinin-I (RCA-I), peanut agglutinin (PNA), and Bandeirea simplicifolia agglutinin-I (BS-I) in frozen sections. However, paraffin sections and frozen sections pretreated with chloroform-methanol or xylene, from the same animals, stained with Concanavlia ensiformis agglutinin (ConA), wheat germ agglutinin (WGA), and succinylated-WGA (S-WGA), in addition to staining with RCA-I, PNA, and BS-I. The affected neurons of canine infantile GM1-gangliosidosis stained only with RCA-I in frozen sections. In paraffin sections, however, these cells were negative with RCA-I but positive with BS-I, ConA, Dolichos biflorus agglutinin (DBA), soybean agglutinin (SBA) and Ulex europaeus agglutinin (UEA-I) in paraffin sections. These results indicate that in paraffin processing of glycolipid storage disease tissue, some lectin receptors are lost and others are unmasked. The retained receptors can be stained with specific lectins and could serve as markers to characterize and differentiate among the various glycolipid storage diseases.
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Vernygorodskyi, S., V. Shkolnikov i D. Suhan. "LECTIN BINDING PATTERNS IN NORMAL, DYSPLASTIC AND HELICOBACTER PYLORI INFECTED GASTRIC MUCOSA". Experimental Oncology 39, nr 2 (22.06.2017): 138–40. http://dx.doi.org/10.31768/2312-8852.2017.39(2):138-140.
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Aim: To analyze the glycoprotein binding sites of the gastric mucosa and its secreted mucus using lectin histochemistry in patients with chronic non-atrophic gastritis (CNAG) associated or not-associated with Helicobacter pylori infection with or without dysplasia. Materials and Methods: In order to identify the areas with glycoconjugates expression in gastric mucosa, 6 lectins (Canavalia ensiformis agglutinin — Con A, Sambucus nigra agglutinin — SNA, wheat germ agglutinin — WGA, soybean agglutinin — SBA, Helix pomatia agglutinin — HPA, peanut agglutinin — PNA) were used. Carbohydrate determinants were visualized according to the lectin-peroxidase-diaminobenzidine staining protocol. Biopsy material was obtained and processed by conventional histological methods. The samples from 84 patients (54 with CNAG) with low (n = 34) and high grade (n = 20) dysplasia, 38 patients were H. pylori-infected and 26 patients — H. pylori-noninfected) were used. The comparison group included 30 persons with CNAG without dysplasia (16 patients H. pylori-infected and 14 — noninfected). Results: In comparison to normal gastric mucosa, a low affinity of Con A was shown in 80% of patients with non-infected CNAG and 90% of H. pylori associated CNAG. In 70% of H. pylori-infected patients with CNAG and low grade dysplasia there was an increase of SNA expression compared with noninfected patients (p < 0.05). Regarding SBA labeling no differences were detected in the studied groups (p < 0.05). In H. pylori infected patients with CNAG and low grade dysplasia, WGA, HPA and PNA showed a strong reactivity with the gastric mucosa cells in 80; 75%, and 60% of patients, respectively. Conclusion: We suggest that a set of lectins in reaction with gastric epithelial and glandular cells can be used as a tool to obtain information about the dysplastic changes of the gastric mucosa and may offer new insight into gastric carcinogenesis and precancerous lesions treatment.
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Bordignon, C., CA Keever, TN Small, N. Flomenberg, B. Dupont, RJ O'Reilly i NA Kernan. "Graft failure after T-cell-depleted human leukocyte antigen identical marrow transplants for leukemia: II. In vitro analyses of host effector mechanisms". Blood 74, nr 6 (1.11.1989): 2237–43. http://dx.doi.org/10.1182/blood.v74.6.2237.2237.
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Abstract To identify mechanisms potentially contributing to graft failure, 19 leukemic recipients of T-cell-depleted marrow transplants who failed to engraft following a transplant of HLA identical sibling marrow depleted of T cells by soybean agglutinin (SBA) and sheep erythrocytes (E) were evaluated. Peripheral blood mononuclear cells isolated at the time of failure were consistently of host origin, bearing the phenotype of suppressor T cells (CD3+, CD8+, Leu 7+). A direct cytolytic effect on 51Cr-labeled donor-derived target cells was not detected, a finding that contrasts with the donor-specific cytotoxic host T lymphocytes that have been regularly observed in patients rejecting HLA nonidentical SBA -E- BMTs. However, these host T cells did exhibit a strong and specific suppressive activity against the donor marrow CFU- GM in vitro. Furthermore, in contrast to prior findings in durably engrafted recipients of SBA -E- BMTs, the lymphocytes isolated prior to or at the time of graft failure lacked natural killer surface antigen expression and effector function.
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Bordignon, C., CA Keever, TN Small, N. Flomenberg, B. Dupont, RJ O'Reilly i NA Kernan. "Graft failure after T-cell-depleted human leukocyte antigen identical marrow transplants for leukemia: II. In vitro analyses of host effector mechanisms". Blood 74, nr 6 (1.11.1989): 2237–43. http://dx.doi.org/10.1182/blood.v74.6.2237.bloodjournal7462237.
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To identify mechanisms potentially contributing to graft failure, 19 leukemic recipients of T-cell-depleted marrow transplants who failed to engraft following a transplant of HLA identical sibling marrow depleted of T cells by soybean agglutinin (SBA) and sheep erythrocytes (E) were evaluated. Peripheral blood mononuclear cells isolated at the time of failure were consistently of host origin, bearing the phenotype of suppressor T cells (CD3+, CD8+, Leu 7+). A direct cytolytic effect on 51Cr-labeled donor-derived target cells was not detected, a finding that contrasts with the donor-specific cytotoxic host T lymphocytes that have been regularly observed in patients rejecting HLA nonidentical SBA -E- BMTs. However, these host T cells did exhibit a strong and specific suppressive activity against the donor marrow CFU- GM in vitro. Furthermore, in contrast to prior findings in durably engrafted recipients of SBA -E- BMTs, the lymphocytes isolated prior to or at the time of graft failure lacked natural killer surface antigen expression and effector function.
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Ito, N., K. Nishi, M. Nakajima, Y. Okamura i T. Hirota. "Effects of alpha-L-fucosidase digestion on lectin staining in human pancreas." Journal of Histochemistry & Cytochemistry 36, nr 5 (maj 1988): 503–9. http://dx.doi.org/10.1177/36.5.2451690.
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We examined the effects of alpha-L-fucosidase digestion on lectin staining in formalin-fixed, paraffin-embedded human pancreatic tissue from individuals of different blood groups. Digestion with the enzyme resulted in apparent diminished intensity of Ulex europaeus agglutinin-I (UEA-I) staining in the acinar cells. In addition to the decreased intensity of UEA-I staining, reactivity with soybean agglutinin (SBA) was increased in the enzyme-susceptible, UEA-I-reactive cells. The intensity of Griffonia simplicifolia agglutinin-II (GSA-II) staining performed after beta-galactosidase digestion in UEA-I-reactive acinar cells was markedly increased by prior treatment with fucosidase. GSA-II staining following sequential digestion with fucosidase and galactosidase was completely abolished by subsequent digestion with beta-N-acetylhexosaminidase. These results therefore substantiate the previous assumption that SBA-reactive D-galactose-(beta 1-3,4)-N-acetyl-D-glucosamine and GSA-II reactive beta-N-acetyl-D-glucosamine imparted following galactosidase digestion represent precursors of H antigen. The present study further demonstrated that intense peanut agglutinin (PNA) staining was imparted after digestion with fucosidase in UEA-I-reactive sites in secretors. In contrast, nonsecretors showed vivid PNA staining that was usually detected throughout the pancreas without prior enzyme digestion. Here, fucosidase digestion had if any little effect on PNA staining. These results suggest that in secretors a terminal trisaccharide, fucosylated D-galactose-(beta 1-3)-N-acetyl-D-galactosamine exhibiting positive PNA reaction after fucosidase digestion, exists in UEA-I-reactive acinar cells. It is assumed that the secretor gene could control the step of final fucosylation of D-galactose-(beta 1-3)-N-acetyl-D-galactosamine in human pancreas.
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Bacic, A., M. L. Williams i A. E. Clarke. "Studies on the cell surface of zoospores and cysts of the fungus Phytophthora cinnamomi: nature of the surface saccharides as determined by quantitative lectin binding studies." Journal of Histochemistry & Cytochemistry 33, nr 5 (maj 1985): 384–88. http://dx.doi.org/10.1177/33.5.3838761.
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The nature of the surface saccharides of zoospores, "partially encysted zoospores" and cysts of the root-rotting fungus Phytophthora cinnamomi, has been examined by quantitative lectin binding studies. Zoospores bound concanavalin A (Con A), but did not bind any of a variety of other lectins tested. In contrast, both cysts and "partially encysted zoospores" bound soybean agglutinin (SBA) as well as Con A. This indicates that accessible alpha-D-glucosyl/alpha-D-mannosyl-containing glycoconjugates predominate at the zoospore surface, whereas both alpha-D-glucosyl/alpha-D-mannosyl and galactosyl and/or N-acetyl-D-galactosaminosyl residues are accessible at the surface of cysts and "partially encysted zoospores." Neither Ulex europeus lectin nor wheat germ agglutinin (WGA) bound to any of the three cell preparations, indicating the absence of accessible alpha-L-fucosyl and N-acetyl-D-glucosaminosyl residues.
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KO, SANG-MU, JONG-OH KIM, MYUNG-JOO OH i DUWOON KIM. "Effects of an Oxidative Agent and Lectins on the Binding Inhibition of Recombinant Hepatitis A Virus Proteins to Oyster Digestive Tissues". Journal of Food Protection 74, nr 1 (1.01.2011): 157–60. http://dx.doi.org/10.4315/0362-028x.jfp-10-211.
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While the exact mechanism of hepatitis A virus (HAV) accumulation remains unclear, it has been demonstrated that viruses related to shellfish-borne gastroenteritis can bind to carbohydrates of oyster tissues. We investigated carbohydrate-binding sites to determine if they were related to the binding of HAV to carbohydrate moieties on oyster digestive tissues (DTs) using recombinant HAV proteins (rHAVPs). In addition, we evaluated lectins to determine if they influenced the inhibition of binding of rHAVPs to carbohydrates present in DT. DT that was treated with 0.5% potassium periodate allowed only 23% ± 3.6% and 33% ± 7.8% binding of VP1-P2A and VP1 rHAVPs, respectively, when compared with a control group (100%) treated with distilled water, indicating that carbohydrate-binding sites are strongly related to the binding of HAV. Soybean agglutinin (SBA) led to the greatest decrease in the binding affinity among six lectins (Helix pomatia, Dolichos biflorus, Ulex europaeus, SBA, Triticum vulgaris, and Arachis hypogaea) tested for inhibition of the binding of rHAVPs to DT, indicating that exposing the virus-contaminated DT to SBA might have the potential to depurate viral contaminants found in shellfish food products by high-affinity binding between SBA and rHAVPs, thus improving food safety.
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Watson, L. P., Y. H. Kang i M. C. Falk. "Cytochemical properties of osteoblast cell membrane domains." Journal of Histochemistry & Cytochemistry 37, nr 8 (sierpień 1989): 1235–46. http://dx.doi.org/10.1177/37.8.2526836.
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The interactions of osteoblasts with one another and with the extracellular milieu are of vital importance for cell function. These interactions are mediated by cell membrane-associated components. In the present work, we studied the distribution of several mediators known to be associated with the cell surface, using ultrastructural cytochemistry, to characterize the three cell membrane domains (osteoid, lateral, and vascular) of osteoblasts. Osteoblasts in neonatal rat calvariae were studied for cell surface distribution of alkaline phosphatase (APase), calcium-activated adenosine triphosphatase (Ca2+-ATPase), calcium, soybean agglutinin (SBA)-reactive sites, and peanut agglutinin (PNA)-reactive sites. APase was absent in the osteoid domain but was evenly distributed in the other domains. Ca2+-ATPase was found to be concentrated mainly in the lateral domains. In contrast, calcium was present in all cell membrane domains. Using lectins conjugated to horseradish peroxidase, we demonstrated that SBA binding sites were evenly distributed along the osteoblast cell membrane, whereas PNA binding sites were absent or minimally present in the osteoid and lateral domains but were evenly distributed in the vascular domain. These results suggest that the various functions of osteoblasts may be facilitated by specialized cell membrane domains which are cytochemically distinct. Previous reports have failed to demonstrate the cytochemical differences between the three domains of the osteoblast cell membrane.
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Wahyuni, Sri, Hamny Sofyan, Hafizuddin Hafizuddin, I. Ketut Mudite Adnyane, Gholib Gholib, Muhammad Jalaluddin, Fadli A. Gani, Mulyadi Adam, Tongku Nizwan Siregar i Srihadi Agungpriyono. "CHARACTERIZATION OF GLYCOCUNJUGATE DISTRIBUTION IN THE EPIDIDYMIS OF THE JAVAN MUNTJACS (Muntiacus muntjak muntjak)". Jurnal Kedokteran Hewan - Indonesian Journal of Veterinary Sciences 16, nr 1 (14.04.2022): 12–17. http://dx.doi.org/10.21157/j.ked.hewan.v16i1.24418.
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The presence of glycoconjugates in caput, corpus, and cauda epididymis of the Javan muntjacs was performed using lectin histochemical method. The epididymis organs were obtained from two adult male Javan muntjacs in hard antler stage and then immediately fixed in Bouin’s solution and processed in histological manner. Six types of biotinylated lectins namely Peanut agglutinin (PNA), Soybean agglutinin (SBA), Wheat germ agglutinin (WGA), Ricinus communis agglutinin (RCA), Concanavalin A (Con A), and Ulex europaeus agglutinin I (UEA I) were applied to detect the specific glycoconjugates in the epididymal tissue of muntjacs. The result showed the presence of glycoconjugates were detected by five types of lectins except UEA I in caput, corpus, and cauda epididymis with specific distribution and also the intensity of lectins binding. Glycoconjugates β-galactose, β-glucose, mannose, N-acetyl-galactosamine, N-acetyl-glucosamine, and sialic acid were stained with various intensity in epithelial cells, basal cells, stereocilia, spermatozoa, and stroma of caput, corpus, and cauda epididymis. The presence of sialic acid on the surface of spermatozoa detected by WGA are thought to be play a role on sperm protection during their maturation and transit along epididymal lumen. In conclusion, the difference of glycoconjugates distribution pattern and lectin binding in the epididymal caput, corpus, and cauda of the Javan muntjac indicates the regional differences in epididymal function in spermatozoa maturation.
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Link, C. D., M. A. Silverman, M. Breen, K. E. Watt i S. A. Dames. "Characterization of Caenorhabditis elegans lectin-binding mutants." Genetics 131, nr 4 (1.08.1992): 867–81. http://dx.doi.org/10.1093/genetics/131.4.867.
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Abstract We have identified 45 mutants of Caenorhabditis elegans that show ectopic surface binding of the lectins wheat germ agglutinin (WGA) and soybean agglutinin (SBA). These mutations are all recessive and define six genes: srf-2, srf-3, srf-4, srf-5, srf-8 and srf-9. Mutations in these genes fall into two phenotypic classes: srf-2, -3, -5 mutants are grossly wild-type, except for their lectin-binding phenotype; srf-4, -8, -9 mutants have a suite of defects, including uncoordinated movement, abnormal egg laying, and defective copulatory bursae morphogenesis. Characterization of these pleiotropic mutants at the cellular level reveals defects in the migration of the gonadal distal tip cell and in axon morphology. Unexpectedly, the pleiotropic mutations also interact with mutations in the lin-12 gene, which encodes a putative cell surface receptor involved in the control of cell fate. We propose that the underlying defect in the pleiotropic mutations may be in the general processing or secretion of extracellular proteins.
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Wu, Ting-Ying, Chendi Gao, Man-Chen Huang, Zhi Zhang, Peng-Yuan Wang, Hsun-Yi Chen, Guosong Chen i Hsien-Yeh Chen. "Vapor-Stripping and Encapsulating to Construct Particles with Time-Controlled Asymmetry and Anisotropy". Coatings 10, nr 12 (18.12.2020): 1248. http://dx.doi.org/10.3390/coatings10121248.
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An innovative chemical vapor sublimation and deposition (CVSD) process was shown to produce nanoscale anisotropic hybrid materials. Taking advantage of controlled thermodynamic properties and the mass transfer of molecules, this process allowed for water vapor sublimation from an iced template/substrate and stagewise vapor deposition of poly-p-xylylene onto the sublimating ice substrate. In this study, the use of sensitive soybean agglutinin (SBA) protein tubes was demonstrated as an example to prepare the anisotropic hybrid material based on the CVSD process. The rationale of a timing parameter, Δt, was controlled to program the sublimation of the SBA-ice templates and the deposition of poly-p-xylylene during the CVSD process. As a result of this control, a stripping stage occurred, during which SBA tubes were exposed on the particle surface, and a subsequent encapsulation stage enabled the transformation of the ice templates into a nanometer-sized anisotropic hybrid material of poly-p-xylylene as the matrix with encapsulated SBA tubes. The timing parameter Δt and the controlled stripping and encapsulating stages during CVSD represent a straightforward and intriguing mechanism stemming from physical chemistry fundamentals for the fabrication of hybrid materials from sensitive molecules and with predetermined sizes and asymmetrical shapes. A simulation analysis showed consistency with the experimental results and controllability of the timing mechanism with predictable particle sizes.
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Baldus, Stephan E., Thomas K. Zirbes, Ion-Corin Weidner, Uta Flucke, Elke Dittmar, Juergen Thiele i Hans P. Dienes. "Comparative Quantitative Analysis of Macrophage Populations Defined by CD68 and Carbohydrate Antigens in Normal and Pathologically Altered Human Liver Tissue". Analytical Cellular Pathology 16, nr 3 (1998): 141–50. http://dx.doi.org/10.1155/1998/192975.
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Liver macrophages, which are involved in the different types of hepatitis, may indirectly induce hepatic fibrogenesis, since they have the possibility to activate hepatic stellate cells and fibroblasts by secretion of TGF-β , TNF-α and IL-1. To evaluate variations of the number of liver macrophages and their subpopulations, a quantification was carried out in normal human liver tissue, fatty liver, fatty liver hepatitis and hepatitis B. Identification was performed by the mab PG-M1 (anti-CD68) and, comparatively, four lectins,Griffonia simplicifoliaagglutinin I (GSA-I),Erythrina cristagalliagglutinin (ECA), peanut agglutinin (PNA) and soybean agglutinin (SBA). A slight decrease in the frequency of macrophages in pericentral fields was observable in fatty liver and fatty liver hepatitis as compared to normal liver tissue. On the other hand, the number of CD68+cells was significantly enhanced in hepatitis B with moderate and severe inflammatory activity. The highest incidence of macrophages was found in portal tracts of liver with fatty liver hepatitis and, particularly, hepatitis B. The fraction of cells stained by ECA, PNA or SBA did not increase significantly under pathological conditions. In contrast, the percentage of GSA-I binding macrophages was higher in liver parenchyma of hepatitis B and in portal tract macrophages in fatty liver hepatitis and also hepatitis B. In conclusion, our results indicate that GSA-I may aid in the detection of the subpopulation of activated macrophages which are assumed to play a pivotal role in liver pathology.
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VanWinkle, W. B. "Lectinocytochemical specificity in human eosinophils and neutrophils: a reexamination." Journal of Histochemistry & Cytochemistry 39, nr 9 (wrzesień 1991): 1157–66. http://dx.doi.org/10.1177/39.9.1918935.
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As with secretory granules in other cell types, many of the protein components that make up the cytoplasmic granules of human leukocytes are glycoproteins. It is not unexpected, therefore, that lectins specific for various carbohydrate moieties can be localized in these granules following appropriate protocols for specimen preparation and thin-section labeling. In this study, isolated human eosinophils and neutrophils were prepared for lectin-gold electron microscopic localization by procedures that involve no exposure to aqueous fixatives, buffers, or solvents (rapid cryofixation and molecular distillation drying), thus removing the potential problem of constituent extraction or translocation during so-called "wet chemical" processing. In contrast to other reports, data presented illustrate the specific binding of soybean agglutinin (SBA) to eosinophil granule matrices (not the crystalline cores), as well as to a population of granules in neutrophils. A similar labeling pattern for wheat germ agglutinin (WGA) was also seen, confirming the presence of N-acetyl-D-galactosamine and N-acetyl-D-glucosamine residues in eosinophil and neutrophil granule matrices. These studies emphasize the need for carefully designed specimen preparation as well as subsequent thin-section labeling procedures in lectinocytochemical studies.
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Simmons, PJ, i B. Torok-Storb. "CD34 expression by stromal precursors in normal human adult bone marrow". Blood 78, nr 11 (1.12.1991): 2848–53. http://dx.doi.org/10.1182/blood.v78.11.2848.2848.
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Abstract Normal bone marrow cells were isolated by fluorescence-activated cell sorting (FACS) on the basis of CD34 antigen expression and then assayed in vitro for colonies of fibroblastic cells (fibroblast colony-forming units [CFU-F]). Greater than 95% of detectable CFU-F were recovered in the CD34+ population, while their numbers were markedly depleted in the CD34- population. Additional experiments showed that the majority of CFU-F exhibited high forward and perpendicular light scatter and low- density CD34 antigen. Growth of sorted cells in medium optimized for long-term marrow culture (LTMC) produced a complex mixture of adherent stromal elements including fibroblasts, adipocytes, smooth muscle cells, and macrophages. Monoclonal antibody STRO-1, which identifies bone marrow stromal cells, reacted with approximately 5% of CD34+ cells, which included all CFU-F and stromal precursors in LTMC. Experiments using soybean agglutinin (SBA) further showed that these stromal elements were restricted to a population of bone marrow cells with the phenotype CD34+/SBA+. These properties of stromal precursors are quite distinct from those of primitive hematopoietic progenitors, showing that although the precursors of the hematopoietic and stromal systems share expression of CD34, they are otherwise phenotypically distinct cell types.
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Simmons, PJ, i B. Torok-Storb. "CD34 expression by stromal precursors in normal human adult bone marrow". Blood 78, nr 11 (1.12.1991): 2848–53. http://dx.doi.org/10.1182/blood.v78.11.2848.bloodjournal78112848.
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Normal bone marrow cells were isolated by fluorescence-activated cell sorting (FACS) on the basis of CD34 antigen expression and then assayed in vitro for colonies of fibroblastic cells (fibroblast colony-forming units [CFU-F]). Greater than 95% of detectable CFU-F were recovered in the CD34+ population, while their numbers were markedly depleted in the CD34- population. Additional experiments showed that the majority of CFU-F exhibited high forward and perpendicular light scatter and low- density CD34 antigen. Growth of sorted cells in medium optimized for long-term marrow culture (LTMC) produced a complex mixture of adherent stromal elements including fibroblasts, adipocytes, smooth muscle cells, and macrophages. Monoclonal antibody STRO-1, which identifies bone marrow stromal cells, reacted with approximately 5% of CD34+ cells, which included all CFU-F and stromal precursors in LTMC. Experiments using soybean agglutinin (SBA) further showed that these stromal elements were restricted to a population of bone marrow cells with the phenotype CD34+/SBA+. These properties of stromal precursors are quite distinct from those of primitive hematopoietic progenitors, showing that although the precursors of the hematopoietic and stromal systems share expression of CD34, they are otherwise phenotypically distinct cell types.
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Li, Siting, Jingjing Meng, Fang Xu, Qian Wang, Xinping Tian, Mengtao Li, Xiaofeng Zeng, Chaojun Hu i Yuehong Zheng. "IgG Glycosylation Profiling of Peripheral Artery Diseases with Lectin Microarray". Journal of Clinical Medicine 11, nr 19 (27.09.2022): 5727. http://dx.doi.org/10.3390/jcm11195727.
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Background: Inflammation plays a key role in the progression of atherosclerotic plaque for peripheral artery disease (PAD). Immunoglobulin G (IgG) glycosylation could modulate immunological effector functions and has been explored as biomarkers for various diseases. Methods: Lectin microarray was applied to analyze the expression profile of serum IgG glycosylation in patients with lower-extremity peripheral artery disease (LEPAD), carotid artery stenosis (CAS), abdominal aortic aneurysm (AAA), and healthy controls. Lectin blot was performed to validate the differences. Results: SNA (Sambucus nigra agglutinin) binding (preferred sialic acid) was significantly higher in the LEPAD (3.21 ± 2.06) and AAA (3.34 ± 2.42) groups compared to the CAS (2.47 ± 1.45) group. Significantly higher binding levels of ConA (Concanavalin A) (preferred mannose) and PSA (Pisum sativum agglutinin) (preferred fucose) were also observed in LEPAD compared to CAS patients. Among LEPAD patients, a significant lower binding level of Black bean crude (preferred GalNAc) was present for dyslipidemia patients. A higher binding level of MNA-M (Morniga M agglutinin) (preferred Mannose) and Jacalin-AIA (Artocarpus integrifolia agglutinin) (preferred Galβ3GalNAc) was observed for Fontaine severe patients. Higher binding levels of PHA-E (Phaseolus vulgaris Erythroagglutinin) and PHA-L (Phaseolus vulgaris Leucoagglutinin) (preferred Galβ4GlcNAc) were observed for diabetic patients, and higher binding of ASA (Allium sativum agglutinin) (preferred Mannose) was present in patients with hypertension. The level of high-sensitivity C-reactive protein (hsCRP) was positively associated with LTL (Lotus tetragonolobus lectin) (r = 0.44), PSA (r = 0.44), LCA (Lens Culinaris agglutinin) (r = 0.39), SNA (r = 0.57), and CSA (Cytisus sscoparius agglutinin) (r = 0.56). For CAS, symptomatic patients had lower binding levels of AAL (Aleuria aurantia lectin) (preferred fucose) and IAA (Iberis amara agglutinin) (preferred GalNAc). Blood total cholesterol level was positively associated with SNA-I (r = 0.36) and SBA (Soybean agglutinin) (r = 0.35). Creatinine levels were positively associated with lectins including, but not limited to, MNA-M (r = 0.42), CSA (r = 0.45), GHA (Glechoma hederacea agglutinin) (r = 0.42), and MNA-G (Morniga G agglutinin) (r = 0.45). Conclusion: LEPAD patients had increased IgG binding levels of SNA and ConA compared to CAS, which could provide potential diagnostic value. Fontaine severity was associated with Mannose-rich IgG N-glycan, while diabetic LEPAD correlated with bisecting GlcNAc. The levels of hsCRP and creatinine were positively associated with IgG fucosylation and galactosylation. Changes in IgG glycosylation may play important roles in PAD pathogenesis and progression.
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Halder, Swagata, Avadhesha Surolia i Chaitali Mukhopadhyay. "Dynamics simulation of soybean agglutinin (SBA) dimer reveals the impact of glycosylation on its enhanced structural stability". Carbohydrate Research 428 (czerwiec 2016): 8–17. http://dx.doi.org/10.1016/j.carres.2016.04.009.
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Jordinson, M., I. El-Hariry, D. Calnan, J. Calam i M. Pignatelli. "Vicia faba agglutinin, the lectin present in broad beans, stimulates differentiation of undifferentiated colon cancer cells". Gut 44, nr 5 (1.05.1999): 709–14. http://dx.doi.org/10.1136/gut.44.5.709.
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BACKGROUNDDietary lectins can alter the proliferation of colonic cells. Differentiation is regulated by adhesion molecules which, being glycosylated, are targets for lectin binding.AIMSTo examine the effects of dietary lectins on differentiation, adhesion, and proliferation of colorectal cancer cells. METHODSDifferentiation was assessed in three dimensional gels, adhesion by aggregation assay, and proliferation by 3H thymidine incorporation. The role of the epithelial cell adhesion molecule (epCAM) was studied using a specific monoclonal antibody in blocking studies and Western blots. The human colon cancer cell lines LS174T, SW1222, and HT29 were studied.RESULTSThe cell line LS174T differentiated in the presence of Vicia fabaagglutinin (VFA) into gland like structures. This was inhibited by anti-epCAM monoclonal antibody. Expression of epCAM itself was unaffected. VFA as well as wheat germ agglutinin (WGA) and the edible mushroom lectin (Agaricus bisporus lectin, ABL) significantly aggregated LS174T cells but peanut agglutinin (PNA) and soybean agglutinin (SBA) did not. All lectins aggregated SW1222 and HT29 cells. Aggregation was blocked by the corresponding sugars. Aggregation of cells by VFA was also inhibited by anti-epCAM. VFA, ABL, and WGL inhibited proliferation of all the cell lines; PNA stimulated proliferation of HT29 and SW1222 cells. In competition studies all sugars blocked aggregation and proliferation of all cell lines, except that the addition of mannose alone inhibited proliferation.CONCLUSIONVFA stimulated an undifferentiated colon cancer cell line to differentiate into gland like structures. The adhesion molecule epCAM is involved in this. Dietary or therapeutic VFA may slow progression of colon cancer.
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Virtanen, I., A. L. Kariniemi, H. Holthöfer i V. P. Lehto. "Fluorochrome-coupled lectins reveal distinct cellular domains in human epidermis." Journal of Histochemistry & Cytochemistry 34, nr 3 (marzec 1986): 307–15. http://dx.doi.org/10.1177/34.3.3512692.
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The distribution of saccharide moieties in human interfollicular epidermis was studied with fluorochrome-coupled lectins. In frozen sections Concanavalin A (Con A), Lens culinaris agglutinin (LCA), Ricinus communis agglutinin I (RCAI), and wheat germ agglutinin (WGA) stained intensively both dermis and viable epidermal cell layers, whereas peanut agglutinin (PNA) bound only to living epidermal cell layers. Ulex europaeus agglutinin I (UEAI) bound to dermal endothelial cells and upper cell layers of the epidermis but left the basal cell layer unstained. Dolichos biflorus agglutinin (DBA) bound only to basal epidermal cells, whereas both soybean agglutinin (SBA) and Helix pomatia agglutinin (HPA) showed strong binding to the spinous and granular cell layers. On routinely processed paraffin sections, a distinctly different staining pattern was seen with many lectins, and to reveal the binding of some lectins a pretreatment with protease was required. All keratin-positive cells in human epidermal cell suspensions, obtained with the suction blister method, bound PNA, whereas only a fraction of the keratinocytes bound either DBA or UEAI. Such a difference in lectin binding pattern was also seen in epidermal cell cultures both immediately after attachment and in organized cell colonies. This suggests that in addition to basal cells, more differentiated epidermal cells from the spinous cell layer are also able to adhere and spread in culture conditions. Gel electrophoretic analysis of the lectin-binding glycoproteins in detergent extracts of metabolically labeled primary keratinocyte cultures revealed that the lectins recognized both distinct and shared glycoproteins. A much different lectin binding pattern was seen in embryonic human skin: fetal epidermis did not show any binding of DBA, whereas UEAI showed diffuse binding to all cell layers but gave a bright staining of dermal endothelial cells. This was in contrast to staining results obtained with a monoclonal cytokeratin antibody, which showed the presence of a distinct basal cell layer in fetal epidermis also. The results indicate that expression of saccharide moieties in human epidermal keratinocytes is related to the stage of cellular differentiation, different cell layers expressing different terminal saccharide moieties. The results also suggest that the emergence of a mature cell surface glycoconjugate pattern in human epidermis is preceded by the acquisition of cell layer-specific, differential keratin expression.
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Minuth, Will, Lucia Denk, Kanghong Hu, Hayo Castrop i Celso Gomez-Sanchez. "The tubulogenic effect of aldosterone is attributed to intact binding and intracellular response of the mineralocorticoid receptor". Open Life Sciences 2, nr 3 (1.09.2007): 307–25. http://dx.doi.org/10.2478/s11535-007-0030-1.
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AbstractLittle is known about the extra- and intracellular stimuli inducing renal stem/progenitor cells to develop into three-dimensionally structured tubules. To study this specific development in a controlled environment, we used an advanced culture technique. Embryonic tissue derived from neonatal rabbit kidney was placed in a perfusion culture container at the interface of an artificial interstitium made of a polyester fleece. Culture was carried out in chemically defined Iscove’s Modified Dulbecco’s Medium (IMDM) for 13 days. Development of tubules was histochemically detected on cryosections labeled with Soybean Agglutinin (SBA). The experiments showed that aldosterone exerts a specific tubulogenic effect. Application of aldosterone (1 × 10−7 M) raised numerous SBA-labeled tubules, while in the absence of the steroid hormone the development of tubules was lacking. Specificity of hormone action was analyzed by the use of aldosterone antagonists. Administration of spironolactone (1 × 10−4 M) and canrenoate (1 × 10−5 M) completely inhibited the development of tubules. Finally, disrupting the intracellular molecular complex of the mineralocorticoid receptor (MR) and heat shock proteins by geldanamycin (2 μg/ml) prevented the development of tubules. Our results suggest that the tubulogenic effect induced by aldosterone is attributed to both hormone binding and an undisturbed intracellular response of the MR.
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Dam, Tarun K., Thomas A. Gerken, Benildo S. Cavada, Kyria S. Nascimento, Tales R. Moura i C. Fred Brewer. "Binding Studies of α-GalNAc-specific Lectins to the α-GalNAc (Tn-antigen) Form of Porcine Submaxillary Mucin and Its Smaller Fragments". Journal of Biological Chemistry 282, nr 38 (25.07.2007): 28256–63. http://dx.doi.org/10.1074/jbc.m704677200.
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Isothermal titration microcalorimetry (ITC) and hemagglutination inhibition measurements demonstrate that a chemically and enzymatically prepared form of porcine submaxillary mucin that possesses a molecular mass of ∼106 daltons and ∼2300 α-GalNAc residues (Tn-PSM) binds to the soybean agglutinin (SBA) with a Kd of 0.2 nm, which is ∼106-fold enhanced affinity relative to GalNAcα1-O-Ser (Tn), the pancarcinoma carbohydrate antigen. The enzymatically derived 81 amino acid tandem repeat domain of Tn-PSM containing ∼23 α-GalNAc residues binds with ∼103-fold enhanced affinity, while the enzymatically derived 38/40 amino acid cleavage product(s) of Tn-PSM containing ∼11-12 α-GalNAc residues shows ∼102-fold enhanced affinity. A natural carbohydrate decorated form of PSM (Fd-PSM) containing 40% of the core 1 blood group type A tetrasaccharide, and 58% peptide-linked GalNAcα1-O-Ser/Thr residues, with 45% of the peptide-linked α-GalNAc residues linked α-(2,6) to N-glycolylneuraminic acid, shows ∼104 enhanced affinity for SBA. Vatairea macrocarpa lectin (VML), which is also a GalNAc binding lectin, displays a similar pattern of binding to the four forms of PSM, although there are quantitative differences in its affinities as compared with SBA. The higher affinities of SBA and VML for Tn-PSM relative to Fd-PSM indicate the importance of carbohydrate composition and epitope density of mucins on their affinities for lectins. The higher affinities of SBA and VML for Tn-PSM relative to its two shorter chain analogs demonstrate that the length of a mucin polypeptide and hence total carbohydrate valence determines the affinities of the three Tn-PSM analogs. The results suggest a binding model in which lectin molecules “bind and jump” from α-GalNAc residue to α-GalNAc residue along the polypeptide chain of Tn-PSM before dissociating. The complete thermodynamic binding parameters for these mucins including their binding stoichiometries are presented. The results have important implications for the biological activities of mucins including those expressing the Tn cancer antigen.
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Keever, CA, K. Welte, T. Small, J. Levick, M. Sullivan, M. Hauch, RL Evans i RJ O'Reilly. "Interleukin 2-activated killer cells in patients following transplants of soybean lectin-separated and E rosette-depleted bone marrow". Blood 70, nr 6 (1.12.1987): 1893–903. http://dx.doi.org/10.1182/blood.v70.6.1893.1893.
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Abstract During the early period following bone marrow transplantation before the immune system has reached full functional maturity, unprimed, nonspecific lytic systems may play a critical role as antiviral or antitumor effectors. The reconstitution of cells with this potential is of particular importance in recipients of bone marrow that has been depleted of mature T lymphocytes to prevent graft v host disease (GVHD). We examined the recovery of natural killer (NK) cells and interleukin 2 (IL 2)-augmented lymphokine-activated killer cells (LAK) in 48 patients at various intervals following transplantation of bone marrow depleted of mature cellular elements by treatment with soybean agglutinin and sheep RBCs (SBA-E- BMT). We found normal levels of both NK and LAK activity as early as 3 weeks following SBA-E- BMT. When compared with cells from controls, NK and LAK precursors from transplant recipients appeared to be activated in vivo in that freshly isolated peripheral blood mononuclear cells (PBMCs) from patients had an elevated cytolytic activity toward NK-insensitive targets and a more rapid response to activation by IL 2. In patients as well as controls, both LAK precursors and LAK effectors lacked antigens present on mature T lymphocytes (CD3, CD4, or CD8) but expressed antigens present on NK cells (CD2, CD16, and NKH1A). The LAK cells did not lyse either donor or host peripheral blood T cell targets. The activity of NK effectors but not LAK precursors survived the in vivo total body irradiation used for pretransplant conditioning in three patients studied. LAK precursors could be demonstrated as early as 18 days following transplant at a time when the bone marrow contained primarily donor- derived cells. Little or no LAK activity could be generated from cells of the SBA-E- BM graft itself, suggesting that LAK precursors differentiate rapidly from more primitive progenitors in the marrow graft. Thus, our data indicate that the NK and LAK lytic systems are among the earliest activities to recover during immune reconstitution following T cell-depleted BMTs.
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Keever, CA, K. Welte, T. Small, J. Levick, M. Sullivan, M. Hauch, RL Evans i RJ O'Reilly. "Interleukin 2-activated killer cells in patients following transplants of soybean lectin-separated and E rosette-depleted bone marrow". Blood 70, nr 6 (1.12.1987): 1893–903. http://dx.doi.org/10.1182/blood.v70.6.1893.bloodjournal7061893.
Pełny tekst źródłaStreszczenie:
During the early period following bone marrow transplantation before the immune system has reached full functional maturity, unprimed, nonspecific lytic systems may play a critical role as antiviral or antitumor effectors. The reconstitution of cells with this potential is of particular importance in recipients of bone marrow that has been depleted of mature T lymphocytes to prevent graft v host disease (GVHD). We examined the recovery of natural killer (NK) cells and interleukin 2 (IL 2)-augmented lymphokine-activated killer cells (LAK) in 48 patients at various intervals following transplantation of bone marrow depleted of mature cellular elements by treatment with soybean agglutinin and sheep RBCs (SBA-E- BMT). We found normal levels of both NK and LAK activity as early as 3 weeks following SBA-E- BMT. When compared with cells from controls, NK and LAK precursors from transplant recipients appeared to be activated in vivo in that freshly isolated peripheral blood mononuclear cells (PBMCs) from patients had an elevated cytolytic activity toward NK-insensitive targets and a more rapid response to activation by IL 2. In patients as well as controls, both LAK precursors and LAK effectors lacked antigens present on mature T lymphocytes (CD3, CD4, or CD8) but expressed antigens present on NK cells (CD2, CD16, and NKH1A). The LAK cells did not lyse either donor or host peripheral blood T cell targets. The activity of NK effectors but not LAK precursors survived the in vivo total body irradiation used for pretransplant conditioning in three patients studied. LAK precursors could be demonstrated as early as 18 days following transplant at a time when the bone marrow contained primarily donor- derived cells. Little or no LAK activity could be generated from cells of the SBA-E- BM graft itself, suggesting that LAK precursors differentiate rapidly from more primitive progenitors in the marrow graft. Thus, our data indicate that the NK and LAK lytic systems are among the earliest activities to recover during immune reconstitution following T cell-depleted BMTs.
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Halder, Swagata, Avadhesha Surolia i Chaitali Mukhopadhyay. "Impact of glycosylation on stability, structure and unfolding of soybean agglutinin (SBA): an insight from thermal perturbation molecular dynamics simulations". Glycoconjugate Journal 32, nr 6 (16.06.2015): 371–84. http://dx.doi.org/10.1007/s10719-015-9601-y.
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Buttle, L. G., A. C. Burrells, J. E. Good, P. D. Williams, P. J. Southgate i C. Burrells. "The binding of soybean agglutinin (SBA) to the intestinal epithelium of Atlantic salmon, Salmo salar and Rainbow trout, Oncorhynchus mykiss, fed high levels of soybean meal". Veterinary Immunology and Immunopathology 80, nr 3-4 (sierpień 2001): 237–44. http://dx.doi.org/10.1016/s0165-2427(01)00269-0.
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Jurat-Fuentes, Juan Luis, Fred L. Gould i Michael J. Adang. "Altered Glycosylation of 63- and 68-Kilodalton Microvillar Proteins in Heliothis virescens Correlates with Reduced Cry1 Toxin Binding, Decreased Pore Formation, and Increased Resistance to Bacillus thuringiensis Cry1 Toxins". Applied and Environmental Microbiology 68, nr 11 (listopad 2002): 5711–17. http://dx.doi.org/10.1128/aem.68.11.5711-5717.2002.
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ABSTRACT The binding and pore formation abilities of Cry1A and Cry1Fa Bacillus thuringiensis toxins were analyzed by using brush border membrane vesicles (BBMV) prepared from sensitive (YDK) and resistant (YHD2) strains of Heliothis virescens. 125I-labeled Cry1Aa, Cry1Ab, and Cry1Ac toxins did not bind to BBMV from the resistant YHD2 strain, while specific binding to sensitive YDK vesicles was observed. Binding assays revealed a reduction in Cry1Fa binding to BBMV from resistant larvae compared to Cry1Fa binding to BBMV from sensitive larvae. In agreement with this reduction in binding, neither Cry1A nor Cry1Fa toxin altered the permeability of membrane vesicles from resistant larvae, as measured by a light-scattering assay. Ligand blotting experiments performed with BBMV and 125I-Cry1Ac did not differentiate sensitive larvae from resistant larvae. Iodination of BBMV surface proteins suggested that putative toxin-binding proteins were exposed on the surface of the BBMV from resistant insects. BBMV protein blots probed with the N-acetylgalactosamine-specific lectin soybean agglutinin (SBA) revealed altered glycosylation of 63- and 68-kDa glycoproteins but not altered glycosylation of known Cry1 toxin-binding proteins in YHD2 BBMV. The F1 progeny of crosses between sensitive and resistant insects were similar to the sensitive strain when they were tested by toxin-binding assays, light-scattering assays, and lectin blotting with SBA. These results are evidence that a dramatic reduction in toxin binding is responsible for the increased resistance and cross-resistance to Cry1 toxins observed in the YHD2 strain of H. virescens and that this trait correlates with altered glycosylation of specific brush border membrane glycoproteins.
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Arnon, Nagler, Morecki Shoshana i Slavin Shimon. "The use of Soybean Agglutinin (SBA) for Bone Marrow (BM) purging and hematopoietic progenitor cell enrichment in clinical bone-marrow transplantation". Molecular Biotechnology 11, nr 2 (kwiecień 1999): 181–94. http://dx.doi.org/10.1007/bf02915811.
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Kim, M., R. Herberman i E. Gorelik. "Increased sensitivity to TNF-mediated cytotoxicity of BL6 melanoma cells after H-2Kb gene transfection." Journal of Immunology 151, nr 7 (1.10.1993): 3467–77. http://dx.doi.org/10.4049/jimmunol.151.7.3467.
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Abstract Transfection of the H-2Kb and neor genes into BL6-8 (H-2Kb-, H-2Db+) melanoma clone resulted in various phenotypic changes with appearance of soybean agglutinin (SBA) and Grifonia Simplicifolia 1-B4 (GS1B4) lectin binding carbohydrates and loss of melanoma-associated antigen (MAA). In parallel H-2Kb gene-transfected melanoma cells showed increased sensitivity to TNF lysis. To further delineate the ability of H-2Kb gene to induce the phenotypic changes and TNF sensitivity, BL6-8 melanoma clone was transfected with the H-2Kb gene alone without cotransfection with neor gene and transfected cells were selected for adherence to SBA lectin-conjugated agarose beads. Analysis of isolated clones revealed that 38 of 47 tested clones have been found to be expressing the H-2Kb Ag, SBA, and GS1B4 lectin binding carbohydrates but lost MAA, e.g., H-2Kb+, lectin+, MAA-, and in parallel these cells became sensitive to TNF lysis. Although all clones with high expression of H-2Kb Ag were sensitive to TNF lysis, it seems unlikely that H-2K molecules are directly required for or involved in TNF-induced melanoma cell lysis. This conclusion is based on findings that four H-2Kb-transfected clones selected on SBA-agarose beads did not expressed H-2Kb Ag but manifested increase in SBA and GS1B4 lectin binding and loss of MAA and also became sensitive to TNF lysis. It seems that increase in TNF sensitivity is a part of the broad phenotypic changes induced by the H-2K gene that remained stable even in the clones in which the transfected H-2Kb gene was lost or down-regulated. We believe that the effects of the H-2Kb gene on melanoma cell phenotype and TNF sensitivity are indirect and are probably mediated via its inhibition of the melanoma-associated ecotropic retrovirus production and activation of some repressed cellular genes. Study of the mechanisms responsible for TNF sensitivity of BL6 melanoma cells revealed that the H-2Kb gene transfection resulted in an increase in p55 TNF receptor expression. TNF-induced activation of phospholipase A2 and release of arachidonic acid metabolites was observed only in the H-2Kb transfected, but not in BL6-8 melanoma cells transfected with neor or class II H-21Ak genes. TNF resistance of BL6 melanoma cells appeared to be due to a block in transduction of the lytic signal that was reversed after transfection with H-2Kb gene.
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Migliaccio, G., AR Migliaccio, ML Druzin, PJ Giardina, KM Zsebo i JW Adamson. "Long-term generation of colony-forming cells in liquid culture of CD34+ cord blood cells in the presence of recombinant human stem cell factor". Blood 79, nr 10 (15.05.1992): 2620–27. http://dx.doi.org/10.1182/blood.v79.10.2620.2620.
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Abstract Human cord blood was used as a source of progenitor and stem cells to evaluate the effect of recombinant human stem-cell factor (SCF) on colony formation and the generation of colony-forming cells (CFC) under highly defined, serum-deprived conditions. SCF interacted with a number of hematopoietic growth factors to stimulate colony growth and was particularly effective in stimulating the formation of mixed-cell colonies from CD34+ soybean agglutinin negative (SBA-) cells. In suspension culture of CD34+, SBA- cells, SCF alone was unable to maintain cell numbers or CFC but, in combination with interleukin-3 (IL- 3), increased input numbers of cells by 10-fold and increased CFC of all kinds by nearly 20-fold. This included erythroid burst-forming cells (BFU-E), granulocyte/macrophage (GM) CFC, and mixed-cell CFC. In contrast, CD34- SBA- cells neither gave rise to CFC nor were maintained by combinations of growth factors including SCF. SCF interacted with erythropoietin (Epo) and granulocyte colony-stimulating factor (G-CSF) to maintain large numbers of cells as well as to generate a twofold to threefold increase in CFC in the case of Epo, and a 10-fold increase in CFC in the case of G-CSF. With Epo, the predominant CFC generated were BFU-E and erythroid CFC and many of the cells in suspension were erythroblasts. In contrast, SCF plus G-CSF resulted in large numbers of granulocytes at various stages of maturation and the CFC generated were almost exclusively granulocytic-CFC. IL-1 and IL-6, alone or in combination with SCF, showed little or no ability to increase cell numbers or generate CFC. In summary, SCF interacts with a variety of hematopoietic growth factors to promote colony formation, particularly mixed-cell colony formation, and also, in suspension culture, SCF interacts with IL-3, G-CSF, and Epo to generate large numbers of differentiated cells as well as a variety of CFC for up to 1 month.
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Migliaccio, G., AR Migliaccio, ML Druzin, PJ Giardina, KM Zsebo i JW Adamson. "Long-term generation of colony-forming cells in liquid culture of CD34+ cord blood cells in the presence of recombinant human stem cell factor". Blood 79, nr 10 (15.05.1992): 2620–27. http://dx.doi.org/10.1182/blood.v79.10.2620.bloodjournal79102620.
Pełny tekst źródłaStreszczenie:
Human cord blood was used as a source of progenitor and stem cells to evaluate the effect of recombinant human stem-cell factor (SCF) on colony formation and the generation of colony-forming cells (CFC) under highly defined, serum-deprived conditions. SCF interacted with a number of hematopoietic growth factors to stimulate colony growth and was particularly effective in stimulating the formation of mixed-cell colonies from CD34+ soybean agglutinin negative (SBA-) cells. In suspension culture of CD34+, SBA- cells, SCF alone was unable to maintain cell numbers or CFC but, in combination with interleukin-3 (IL- 3), increased input numbers of cells by 10-fold and increased CFC of all kinds by nearly 20-fold. This included erythroid burst-forming cells (BFU-E), granulocyte/macrophage (GM) CFC, and mixed-cell CFC. In contrast, CD34- SBA- cells neither gave rise to CFC nor were maintained by combinations of growth factors including SCF. SCF interacted with erythropoietin (Epo) and granulocyte colony-stimulating factor (G-CSF) to maintain large numbers of cells as well as to generate a twofold to threefold increase in CFC in the case of Epo, and a 10-fold increase in CFC in the case of G-CSF. With Epo, the predominant CFC generated were BFU-E and erythroid CFC and many of the cells in suspension were erythroblasts. In contrast, SCF plus G-CSF resulted in large numbers of granulocytes at various stages of maturation and the CFC generated were almost exclusively granulocytic-CFC. IL-1 and IL-6, alone or in combination with SCF, showed little or no ability to increase cell numbers or generate CFC. In summary, SCF interacts with a variety of hematopoietic growth factors to promote colony formation, particularly mixed-cell colony formation, and also, in suspension culture, SCF interacts with IL-3, G-CSF, and Epo to generate large numbers of differentiated cells as well as a variety of CFC for up to 1 month.
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Kaspera, Michael, Gunter Haroske i Martin Müller. "Species differences in lectin binding to pulmonary cells: Soybean agglutinin (SBA) as a marker of type I alveolar epithelial cells and alveolar macrophages in mini pigs". Acta Histochemica 96, nr 1 (marzec 1994): 63–73. http://dx.doi.org/10.1016/s0065-1281(11)80010-3.
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Boulad, Farid, Arleen D. Auerbach, Nancy A. Kernan, Trudy N. Small, Susan E. Prockop, Sonali Chaudhury, Joanne Castanza i in. "Fludarabine (Flu) Based Cytoreductive Regimen and T-Cell Depleted Grafts from Unrelated or Mismatched Related Donors for the Treatment of High Risk Patients with Fanconi Anemia (FA)." Blood 104, nr 11 (16.11.2004): 2152. http://dx.doi.org/10.1182/blood.v104.11.2152.2152.
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Abstract Between 05/98 and 06/04, 15 consecutive patients with FA received hematopoietic stem cell transplants (SCT) from alternative donors at our Center. There were 7 males and 8 females aged 5 to 24 years (median 11.5). Hematologic diagnoses included aplastic anemia (AA) (N=5), myelodysplastic syndrome (MDS) in RAEB (N=4), RAEBT (N=1) or acute myelogenous leukemia (AML) (N=5). High risk features included: Age > 20 years (n=4), prior multiple transfusions (n=11), prior androgen treatment (n=12), prior infections (n=10), or advanced MDS or AML (n=9). Eight pts had related mismatched donors transplants with respective matching at 3/6 (6/10), 4/6 (6/10), 4/6 (7/10) (n=2)), 5/6 (8/10) (n=3) and 5/6 (9/10) HLA-antigens. Seven pts had unrelated donors transplants with respective matching at 5/6 (7/10), 5/6 (8/10) (n=2), 5/6 (9/10) and 6/6 (10/10) (n=3) HLA-antigens. Cytoreduction included single dose total body irradiation (SDTBI) (450 cGy), fludarabine (Flu) (30 mg/m2 x 5) and cyclophosphamide (Cy) (10 mg/Kg x 4). Immunosuppression included rabbit anti-thymocyte globulin (Thymoglobulin) and tacrolimus for all patients. Grafts were G-CSF mobilized CD34+ and E-rosette negative (E-) peripheral blood stem cell transplants for 12 pts and soybean agglutinin negative (SBA-) and E-rosette negative marrow transplants for 3 pts. Cell doses of the grafts were 1.5 – 29.6 x 106 CD34 cells/Kg and 0 – 26 x 103 CD3 cells/Kg. As evidenced by RFLP or FISH, all 15 evaluable pts were fully engrafted and complete chimeras. Fourteen pts were evaluable for graft-versus-host disease (GvHD). GvHD of the skin and of the gut was suspected in two pts but resolved completely prior to immunosuppressive treatment. With a median follow-up of 2.5 years (range 0.2–6), 13 of 15 pts are alive and 11 of 15 are alive disease-free. There were two deaths: one pt died from sepsis/ARDS at 2 months post SCT and one pt from pneumonitis/ARDS and EBV-infection 6 months post SCT. Three pts relapsed (MDS-RAEB x 1 – AML x 2): One pt relapsed 7 months post transplant, received a 2nd transplant from the same donor following busulfan and Flu and is alive, disease-free 18 months post SCT, while the other two pts are awaiting a second SCT. In summary, this cytoreductive regimen used with T-cell depleted stem cell transplants from unrelated or HLA-mismatched related donors for the treatment of high risk patients with Fanconi anemia, results in rapid hematopoietic engraftment and lymphohematopoietic reconstitution with minimal GVHD and a high disease-free survival.
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Croucher, S. J., i C. Tickle. "Characterization of epithelial domains in the nasal passages of chick embryos: spatial and temporal mapping of a range of extracellular matrix and cell surface molecules during development of the nasal placode". Development 106, nr 3 (1.07.1989): 493–509. http://dx.doi.org/10.1242/dev.106.3.493.
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The formation of the nasal passages involves complex morphogenesis and their lining develops a spatially ordered pattern of differentiation, with distinct domains of olfactory and respiratory epithelium. Using antibodies to the neural cell adhesion molecule (N-CAM), keratan sulphate and heparan sulphate proteoglycan (HSPG) and a panel of lectins (agglutinins of Canavalia ensiformis (ConA), Dolichos biflorus (DBA), peanut (PNA), Ricinis communis (RCA1), soybean (SBA), Ulex europaeus (UEA1), and wheatgerm (WGA], we have documented cell surface characteristics of each epithelial domain. Binding of antibodies to N-CAM and to keratan sulphate, and the lectins ConA, PNA, RCA1, SBA and WGA marks the olfactory epithelial domain only. The restriction of N-CAM to the sensory region of the epithelium has also been reported in the developing ear. This striking similarity is consistent with the idea that N-CAM may be involved in the division of functionally and histologically distinct cell groups within an epithelium. We traced the olfactory-specific cell markers during development to gain insights into the origin of the epithelial lining of the nasal passages. All reagents bind at early stages to the thickened nasal placode and surrounding head ectoderm and then become progressively restricted to the olfactory domain. The expression of these characteristics appears to be modulated during development rather than being cell autonomous. The distribution of keratan sulphate was compared with collagen type II in relation to the specification of the chondrocranium. Keratan sulphate and collagen type II are only colocalized at the epithelial-mesenchymal interface during early nasal development. At later stages, only collagen type II is expressed at the interface throughout the nasal passages, whereas keratan sulphate is absent beneath the respiratory epithelium.
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Pan, Li, Yan Liu, Hainan Lan, Nan Bao, Yuan Zhao, Hui Sun, Guixin Qin i Mohammed Hamdy Farouk. "Biological Mechanisms Induced by Soybean Agglutinin Using an Intestinal Cell Model of Monogastric Animals". Frontiers in Veterinary Science 8 (2.06.2021). http://dx.doi.org/10.3389/fvets.2021.639792.
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Soybean agglutinin (SBA) has a toxic effect on most animals. The anti-nutritional mechanisms of SBA are not fully understood, in terms of cell survival activity and metabolism of intestinal cells. This study aims to investigate the effects of SBA on the cell cycle, apoptosis, and to verify the mechanism of SBA anti-nutritional characters based on proteomic-based analysis. The IPEC-J2 cell line was cultured with medium containing 0.0, 0.5, or 2.0 mg/mL SBA. With increasing SBA levels, the percentage of the cells at G0/G1 phase, cell apoptosis rates, expressions of Bax and p21, and the activities of Casp-3 and Casp-9 were increased, while cyclin D1 and Bcl-2 expressions were declined (p < 0.05). The proteomic analysis showed that the numbers of differentially expressed proteins, induced by SBA, were mainly enriched in different pathways including DNA replication, base excision repair, nucleus excision repair, mismatch repair, amide and peptide biosynthesis, ubiquitin-mediated proteolysis, as well as structures and functions of mitochondria and ribosome. In conclusion, the anti-nutritional mechanism of SBA is a complex cellular process. Such process including DNA related activities; protein synthesis and metabolism; signal-conducting relation; as well as subcellular structure and function. This study provides comprehensive information to understand the toxic mechanism of SBA in monogastrics.