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Vecchio G, Parascandolo A, Allocca C, Ugolini C, Basolo F, Moracci M, Strazzulli A, Cobucci-Ponzano B, Laukkanen MO, Castellone MD, Tsuchida N. Human a-L-fucosidase-1 attenuates the invasive properties of thyroid cancer. Oncotarget 2018; 8:27075-27092. [PMID: 28404918 PMCID: PMC5432319 DOI: 10.18632/oncotarget.15635] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 01/24/2017] [Indexed: 12/19/2022] Open
Abstract
Glycans containing α-L-fucose participate in diverse interactions between cells and extracellular matrix. High glycan expression on cell surface is often associated with neoplastic progression. The lysosomal exoenzyme, α-L-fucosidase-1 (FUCA-1) removes fucose residues from glycans. The FUCA-1 gene is down-regulated in highly aggressive and metastatic human tumors. However, the role of FUCA-1 in tumor progression remains unclear. It is speculated that its inactivation perturbs glycosylation of proteins involved in cell adhesion and promotes cancer. FUCA-1 expression of various thyroid normal and cancer tissues assayed by immunohistochemical (IHC) staining was high in normal thyroids and papillary thyroid carcinomas (PTC), whereas it progressively decreased in poorly differentiated, metastatic and anaplastic thyroid carcinomas (ATC). FUCA-1 mRNA expression from tissue samples and cell lines and protein expression levels and enzyme activity in thyroid cancer cell lines paralleled those of IHC staining. Furthermore, ATC-derived 8505C cells adhesion to human E-selectin and HUVEC cells was inhibited by bovine α-L-fucosidase or Lewis antigens, thus pointing to an essential role of fucose residues in the adhesive phenotype of this cancer cell line. Finally, 8505C cells transfected with a FUCA-1 containing plasmid displayed a less invasive phenotype versus the parental 8505C. These results demonstrate that FUCA-1 is down-regulated in ATC compared to PTC and normal thyroid tissues and cell lines. As shown for other human cancers, the down-regulation of FUCA-1 correlates with increased aggressiveness of the cancer type. This is the first report indicating that the down-regulation of FUCA-1 is related to the increased aggressiveness of thyroid cancer.
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Affiliation(s)
- Giancarlo Vecchio
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università di Napoli Federico II, Via Sergio Pansini, 5, Naples, Italy.,Istituto Superiore di Oncologia, Via Sergio Pansini, 5, Naples and Via Balbi 5, Genoa, Italy
| | | | - Chiara Allocca
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università di Napoli Federico II, Via Sergio Pansini, 5, Naples, Italy
| | - Clara Ugolini
- Dipartimento di Medicina di Laboratorio, Azienda Ospedaliero-Universitaria Pisana, Pisa, Italy
| | - Fulvio Basolo
- Dipartimento di Patologia Chirurgica, Medica, Molecolare e dell'Area Critica, University of Pisa, Italy
| | - Marco Moracci
- Institute of Biosciences and Bioresources (IBBR), National Research Council of Italy (CNR), Via P. Castellino, 111, Naples, Italy.,Department of Biology, University of Naples "Federico II", Complesso Universitario di Monte S. Angelo, Naples, Italy
| | - Andrea Strazzulli
- Institute of Biosciences and Bioresources (IBBR), National Research Council of Italy (CNR), Via P. Castellino, 111, Naples, Italy.,Department of Biology, University of Naples "Federico II", Complesso Universitario di Monte S. Angelo, Naples, Italy
| | - Beatrice Cobucci-Ponzano
- Institute of Biosciences and Bioresources (IBBR), National Research Council of Italy (CNR), Via P. Castellino, 111, Naples, Italy
| | | | | | - Nobuo Tsuchida
- Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University, Tokyo, Japan
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2
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Immunosuppressive drugs affect high-mannose/hybrid N-glycans on human allostimulated leukocytes. Anal Cell Pathol (Amst) 2015; 2015:324980. [PMID: 26339568 PMCID: PMC4538311 DOI: 10.1155/2015/324980] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 07/21/2015] [Indexed: 02/04/2023] Open
Abstract
N-glycosylation plays an important role in the majority of physiological and pathological processes occurring in the immune system. Alteration of the type and abundance of glycans is an element of lymphocyte differentiation; it is also common in the development of immune-mediated inflammatory diseases. The N-glycosylation process is very sensitive to different environmental agents, among them the pharmacological environment of immunosuppressive drugs. Some results show that high-mannose oligosaccharides have the ability to suppress different stages of the immune response. We evaluated the effects of cyclosporin A (CsA) and rapamycin (Rapa) on high-mannose/hybrid-type glycosylation in human leukocytes activated in a two-way mixed leukocyte reaction (MLR). CsA significantly reduced the number of leukocytes covered by high-mannose/hybrid N-glycans, and the synergistic action of CsA and Rapa led to an increase of these structures on the remaining leukocytes. This is the first study indicating that β1 and β3 integrins bearing high-mannose/hybrid structures are affected by Rapa and CsA. Rapa taken separately and together with CsA changed the expression of β1 and β3 integrins and, by regulating the protein amount, increased the oligomannose/hybrid-type N-glycosylation on the leukocyte surface. We suggest that the changes in the glycosylation profile of leukocytes may promote the development of tolerance in transplantation.
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Wang L, Liang Y, Li Z, Cai X, Zhang W, Wu G, Jin J, Fang Z, Yang Y, Zha X. Increase in β1-6 GlcNAc branching caused byN-acetylglucosaminyltransferase V directs integrin β1 stability in human hepatocellular carcinoma cell line SMMC-7721. J Cell Biochem 2007; 100:230-41. [PMID: 16924681 DOI: 10.1002/jcb.21071] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In this study, an enzymatic inactive mutant of GnT-V (delta cGnT-V) was constructed and transfected in SMMC 7721 cell line. Integrin beta1 in delta cGnT-V transfectants (delta c-7721) showed attenuation of the number of beta1-6 GlcNAc branching, whereas those in wtGnT-V transfectants (wt-7721) presented a beta1-6 GlcNAc-rich pattern. High integrin beta1 expression was observed in wt-7721 compared with mock cells (7721 cell transfected with the vector pcDNA3), while transfection of delta cGnT-V decreased the integrin beta1 expression, despite of no significant changes on integrin beta1 mRNA level in these cell lines. Pulse-chase experiment showed that Integrin beta1 in delta c-7721 was prone to quick degradation and its half-life was less than 3 h, on the contrary, the alleviating degradation of beta1 subunit was observed in wt-7721 where the beta1 subunit half-life was about 16 h, meanwhile, the degradation rate of beta1 subunit in mock cells was in between, about 10 h. More effective in promoting cell migration toward fibronectin and invasion through Matrigel was observed in wt-7721 while this was almost suppressed in delta c-7721. Our results suggest that the addition of beta1-6 GlcNAc branching caused more fully glycosylated mature form on integrin beta1 and inhibited beta1 protein degradation. Glycosylation caused by GnT-V directs integrin beta1 stability and more delivery to plasma membrane, subsequently promotes Fn-based cell migration and invasion.
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Affiliation(s)
- Liying Wang
- Department of Biochemistry and Molecular Biology, Shanghai Medical College, Fudan University, Shanghai 200032, China
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4
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Reyes FJ, Centelles JJ, Lupiáñez JA, Cascante M. (2α,3β)-2,3-Dihydroxyolean-12-en-28-oic acid, a new natural triterpene fromOlea europea, induces caspase dependent apoptosis selectively in colon adenocarcinoma cells. FEBS Lett 2006; 580:6302-10. [PMID: 17083937 DOI: 10.1016/j.febslet.2006.10.038] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2006] [Revised: 10/09/2006] [Accepted: 10/17/2006] [Indexed: 11/21/2022]
Abstract
Triterpenoids are known to induce apoptosis and to be anti-tumoural. Maslinic acid, a pentacyclic triterpene, is present in high concentrations in olive pomace. This study examines the response of HT29 and Caco-2 colon-cancer cell lines to maslinic-acid treatment. At concentrations inhibiting cell growth by 50-80% (IC50HT29=61+/-1 microM, IC80HT29=76+/-1 microM and IC50Caco-2=85+/-5 microM, IC80Caco-2=116+/-5 microM), maslinic acid induced strong G0/G1 cell-cycle arrest and DNA fragmentation, and increased caspase-3 activity. However, maslinic acid did not alter the cell cycle or induce apoptosis in the non-tumoural intestine cell lines IEC-6 and IEC-18. Moreover, maslinic acid induced cell differentiation in colon adenocarcinoma cells. These findings support a role for maslinic acid as a tumour suppressant and as a possible new therapeutic tool for aberrant cell proliferation in the colon. In this report, we demonstrate for the first time that, in tumoural cancer cells, maslinic acid exerts a significant anti-proliferation effect by inducing an apoptotic process characterized by caspase-3 activation by a p53-independent mechanism, which occurs via mitochondrial disturbances and cytochrome c release.
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Affiliation(s)
- Fernando J Reyes
- Department of Biochemistry and Molecular Biology, University of Granada, Granada, Spain
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5
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Przybyło M, Lityńska A, Pocheć E. Different adhesion and migration properties of human HCV29 non-malignant urothelial and T24 bladder cancer cells: role of glycosylation. Biochimie 2005; 87:133-42. [PMID: 15760705 DOI: 10.1016/j.biochi.2004.12.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2004] [Accepted: 12/14/2004] [Indexed: 11/22/2022]
Abstract
In tumour cells, alterations in cellular glycosylation may play a key role in their metastatic behaviour. This study used cell lines having very different behaviour in vivo: HCV29 non-malignant transitional epithelium and T24 bladder transitional cell carcinoma. These differences in behaviour might be due in part to differences in cellular glycosylation patterns. Glycan chain analysis of their glycoproteins was performed with the use of specific lectins. The functional role of carbohydrates was studied by treating these cells with swainsonine, an inhibitor of Golgi alpha-mannosidase II, and in vitro adhesion and migration assays. The adhesion of swainsonine-treated HCV29 and T24 cells was increased on fibronectin and type IV collagen by 1.5- and 2-fold, respectively, whereas adhesion on laminin was virtually unchanged after swainsonine-treatment in HCV29 cells and was increased in T24 cells. Swainsonine treatment reduced the rate of T24 cell migration by 20%. We concluded that beta1-6 branched tri- and tetraantennary complex-type glycans have an important function in adhesion and migration in the studied cell lines. These data support the view that oligosaccharides are involved in several steps of the metastatic process.
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Affiliation(s)
- M Przybyło
- Department of Animal Physiology, Institute of Zoology, Jagiellonian University, Ingardena 6, 30-060 Kraków, Poland.
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Clément M, Rocher J, Loirand G, Le Pendu J. Expression of sialyl-Tn epitopes on beta1 integrin alters epithelial cell phenotype, proliferation and haptotaxis. J Cell Sci 2004; 117:5059-69. [PMID: 15383613 DOI: 10.1242/jcs.01350] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Sialyl-Tn (STn) is a tumor-associated carbohydrate antigen overexpressed in various carcinomas. To obtain its expression, murine carcinoma cells were transfected with the cDNA encoding ST6GalNAc I, a glycosyltransferase that acts exclusively on O-glycans. Overexpression of this enzyme led to the expected expression of cell surface STn epitopes. Surprisingly, the transfectants (STn+ cells) presented dramatic morphological changes and altered behavior. These STn+ cells lost the epithelial appearance of parental cells, became larger, more elongated and presented disorganized actin stress fibers. Additionally, their proliferation was impaired and their ability to migrate on fibronectin and hyaluronic acid was severely reduced. By contrast their adhesion on fibronectin remained unchanged. The major glycoprotein carrying the STn epitope was shown to be the integrin beta1 subunit. Anti-STn antibodies could restore migration of STn+ cells on fibronectin. A constitutively active permeant form of RhoA (TAT-RhoA(Val-14)) also restored motility on fibronectin of STn+ cells as well as a parental STn-cellular phenotype. These observations indicate that overexpression of ST6GalNAc I leads to a major change of the O-glycosylation of the integrin beta1 chain which in turn impairs the integrin-mediated signalling and leads to major alterations in morphology and cell behavior.
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Affiliation(s)
- Monique Clément
- INSERM U601, Institut de Biologie, 9 quai Moncousu, 44093 Nantes CEDEX, France.
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7
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Thirkill TL, Hendren SR, Soghomonians A, Mariano NF, Barakat AI, Douglas GC. Regulation of trophoblast beta1-integrin expression by contact with endothelial cells. Cell Commun Signal 2004; 2:4. [PMID: 15189562 PMCID: PMC434534 DOI: 10.1186/1478-811x-2-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2004] [Accepted: 06/09/2004] [Indexed: 11/15/2022] Open
Abstract
Background In human and non-human primates, migratory trophoblasts penetrate the uterine epithelium, invade uterine matrix, and enter the uterine vasculature. Invasive trophoblasts show increased expression of β1 integrin. Since trophoblast migration within the uterine vasculature involves trophoblast attachment to endothelial cells lining the vessel walls, this raises the possibility that cell-cell contact and/or factors released by endothelial cells could regulate trophoblast integrin expression. To test this, we used an in vitro system consisting of early gestation macaque trophoblasts co-cultured on top of uterine microvascular endothelial cells. Results When cultured alone, trophoblasts expressed low levels of β1 integrin as determined by quantitative immunofluorescence microscopy. When trophoblasts were cultured on top of endothelial cells for 24 h, the expression of trophoblast β1 integrin was significantly increased as determined by image analysis. β1 Integrin expression was not increased when trophoblasts were cultured with endothelial cell-conditioned medium, suggesting that upregulation requires direct contact between trophoblasts and endothelial cells. To identify endothelial cell surface molecules responsible for induction of trophoblast integrin expression, trophoblasts were cultured in dishes coated with recombinant platelet endothelial cell adhesion molecule-1 (PECAM-1), intercellular adhesion molecule-1 (ICAM-1), or αVβ3 integrin. Trophoblast β1 integrin expression (assessed by immunofluorescence microscopy and Western blotting) was increased when PECAM-1 or αVβ3 integrin, but not ICAM-1, was used as substrate. Conclusions Direct contact between trophoblasts and endothelial cells increases the expression of trophoblast β1 integrin.
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Affiliation(s)
- Twanda L Thirkill
- Department of Cell Biology and Human Anatomy, School of Medicine, University of California, Davis CA 95616, USA
| | - Sonia R Hendren
- Department of Cell Biology and Human Anatomy, School of Medicine, University of California, Davis CA 95616, USA
| | - Arlen Soghomonians
- Department of Mechanical and Aeronautical Engineering, University of California, Davis CA 95616, USA
| | - Natalie F Mariano
- Department of Cell Biology and Human Anatomy, School of Medicine, University of California, Davis CA 95616, USA
| | - Abdul I Barakat
- Department of Mechanical and Aeronautical Engineering, University of California, Davis CA 95616, USA
| | - Gordon C Douglas
- Department of Cell Biology and Human Anatomy, School of Medicine, University of California, Davis CA 95616, USA
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8
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Bellis SL. Variant glycosylation: an underappreciated regulatory mechanism for β1 integrins. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2004; 1663:52-60. [PMID: 15157607 DOI: 10.1016/j.bbamem.2004.03.012] [Citation(s) in RCA: 125] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2004] [Revised: 03/24/2004] [Accepted: 03/31/2004] [Indexed: 01/07/2023]
Abstract
Although it has been known for many years that beta1 integrins undergo differential glycosylation in accordance with changes in cell phenotype, the potential role of N-glycosylation as a modulator of integrin function has received little attention. One reason for the relatively limited interest in this topic likely relates to the fact that much of the prior research was correlative in nature. However, new results now bolster the hypothesis that there is a causal relationship between variant glycosylation and altered integrin activity. In this review, the evidence for variant glycosylation as a regulatory mechanism for beta1 integrins are summarized, with particular emphasis on: (1). outlining the instances in which cell phenotypic variation is associated with differential beta1 glycosylation, (2). describing the specific alterations in glycan structure that accompany phenotypic changes and (3). presenting potential mechanisms by which variant glycosylation might regulate integrin function.
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Affiliation(s)
- Susan L Bellis
- Department of Physiology and Biophysics, University of Alabama at Birmingham, MCLM 982A, 1918 University Boulevard, Birmingham, AL 35294, USA.
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9
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Pocheć E, Lityńska A, Amoresano A, Casbarra A. Glycosylation profile of integrin α3β1 changes with melanoma progression. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2003; 1643:113-23. [PMID: 14654234 DOI: 10.1016/j.bbamcr.2003.10.004] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Glycosylation of integrins has been implicated in the modulation of their function. Characterisation of carbohydrate moieties of alpha(3) and beta(1) subunits from non-metastatic (WM35) and metastatic (A375) human melanoma cell lines was carried out on peptide-N-glycosidase F-released glycans using matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS). beta(1) integrin subunit from both cell lines displayed tri- and tetraantennary oligosaccharides complex type glycans, but only in A375 cell line was the sialylated tetraantennary complex type glycan (Hex(7)HexNAc(6)FucSia(4)) present. In contrast, only alpha(3) subunit from metastatic cells possessed beta1-6 branched structures. Our data indicate that the beta(1) and alpha(3) subunits expressed by the metastatic A375 cell line carry beta1-6 branched structures, suggesting that these cancer-associated glycan chains may modulate tumor cell adhesion by affecting the ligand binding properties of alpha(3)beta(1) integrin. In direct ligand binding assays, alpha(3)beta(1) integrin from both cell lines binds strongly to fibronectin and to much lesser degree to placental laminin. No binding to collagen IV was observed. Enzymatic removal of sialic acid residues from purified alpha(3)beta(1) integrin stimulates its adhesion to all examined ECM proteins. Our data suggest that the glycosylation profile of alpha(3)beta(1) integrin in human melanoma cells correlates with the acquisition of invasive capacity during melanoma progression.
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Affiliation(s)
- Ewa Pocheć
- Institute of Zoology, Jagiellonian University, R. Ingardena 6, 30-060 Cracow, Poland
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10
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Lourenço A, Máximo P, Ferreira L, Pereira M. Indolizidine and quinolizidine alkaloids structure and bioactivity. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1572-5995(02)80038-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2023]
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11
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Pretzlaff RK, Xue VW, Rowin ME. Sialidase treatment exposes the beta1-integrin active ligand binding site on HL60 cells and increases binding to fibronectin. CELL ADHESION AND COMMUNICATION 2001; 7:491-500. [PMID: 11051459 DOI: 10.3109/15419060009040306] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The migration of neutrophils from the circulation to areas of inflammation is the result of the sequential activation of multiple cellular adhesion molecules. beta1-Integrins are cell surface glycoproteins and the class of adhesion molecules responsible for binding to the extracellular matrix. The goal of this study was to determine the contribution of glycosylation, specifically the presence of sialic acid, to beta1-integrin adhesion in a neutrophil model. beta1-Integrins on differentiated HL60 cells were remodeled by treatment with the exoglycosidases, sialidase and beta-galactosidase. beta1-Integrin activity was determined by measuring adherence to the extracellular matrix protein fibronectin. The expression of beta1-integrins, beta2-integrins and activated beta1-integrins was determined by flow cytometry. Remodeling of beta1-integrins by treatment with sialidase increased adhesion by greater than 1,000%. Flow cytometric analysis of remodeled beta1-integrins demonstrated an increased expression of the activated beta1-integrin, but only minor increases in the expression of total beta1- and beta2-integrins. We postulate that glycosidase treatment increases adhesion and expression of activated beta1-integrins by exposure of the normally hidden ligand-binding site. The glycosylation of beta1-integrins on neutrophils may act to hide the ligand-binding site in unstimulated cells thereby contributing to the affinity modulation observed in neutrophil beta1-integrin function.
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Affiliation(s)
- R K Pretzlaff
- Division of Critical Care Medicine, Children's Hospital Medical Center, Cincinnati, OH 45229, USA.
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12
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Braut-Boucher F, Font J, Pichon J, Paulin Y, Boukhélifa M, Aubery M, Derappe C. T lymphocytes from Sézary syndrome patients express beta1 integrins whose beta(1-6)-branched N-linked oligosaccharides reflect their adhesive capacity. Leuk Res 1998; 22:947-52. [PMID: 9766755 DOI: 10.1016/s0145-2126(98)00094-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sézary syndrome (Sz), characterized by slowly progressing clonal proliferation of CD4+, CD45 RO+ T cells, has several forms that are distinguished according to the epidermotropic properties of the pathological cells. In a recent paper (Derappe C, Haentjens G, Lemaire S, Feugeas JP, Lebbe C, Pasqualetto V, Bussel A, Aubery M, Néel D. Leukemia 1996;10:138), we observed that T lymphocytes from most of the Sézary patients [Szbeta(1-6)+] expressed high levels of beta(1-6)-GlcNAc-branched N-linked oligosaccharides while T lymphocytes from other patients [Szbeta(1-6)-] did not. Because this observation suggests the possibility of two forms of Sz, distinguished according to the expression rate of these glycans, we looked for a possible relationship between this expression rate and T-cell adhesiveness. Using an original protocol (Braut-Boucher F, Pichon J, Rat P, Adolphe M, Aubery M, Font J. J Immunol Methods 1995;178:41), we observed that T lymphocytes obtained from the Szbeta(1-6)+ patients adhered less to normal keratinocyte monolayers than T lymphocytes from Szbeta(1-6)- patients and normal donors. As assessed by FACS analysis, all the integrin-subunits studied were more expressed on Szbeta(1-6)-, especially alpha4, alpha5, beta1 and beta2, than on Szbeta(1-6)+ and normal lymphocytes. Although these results suggest that beta1- and beta2-integrin expression is involved in the adhesive properties of these T-cells, other factors, such as glycosylation, may also contribute. To demonstrate this possibility, we sought the presence of beta(1-6)-GlcNAc-branched N-linked oligosaccharides on beta1 integrins expressed by T lymphocytes from Sz patients. Immunoblot experiments, performed using the specific lectin from Phaseolus vulgaris (Leukoagglutinin form), showed that only the beta1 integrin subunit expressed by T lymphocytes from Szbeta(1-6)+ patients carried these glycans, supporting the concept of the involvement of T-cell glycosylation in the evolution of Sz.
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Affiliation(s)
- F Braut-Boucher
- Laboratoire de Glycobiologie et Cancérologie Cellulaires, Université René-Descartes-Paris V, UFR Biomédicale, France
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Richard C, Thibaudeau K, Charreau B, Loirat MJ, Naulet J, Blanchard D, Soulillou JP, Bouhours JF. Characterization of a murine monoclonal antibody specific for swine beta1 integrin. Xenotransplantation 1998; 5:75-83. [PMID: 9507737 DOI: 10.1111/j.1399-3089.1998.tb00012.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Murine monoclonal antibodies were raised against porcine platelets in order to provide tools for investigating interactions of human blood cells and natural antibodies with porcine tissues. Hybridomas were screened by cellular ELISA on porcine platelets and endothelial cells. Positive clones were tested by flow cytometry for reactivity with isolated endothelial cells. One clone, NaM160-1A3, produced an antibody that stained porcine but not human endothelial cells and lymphocytes. The antibody bound to a 116 kDa glycoprotein on Western blot of both platelets and endothelial cells. The antigen was purified from a platelet lysate by affinity chromatography, first on a ConA column and then on a column presenting the immobilized NaM160-1A3 antibody. Two glycoproteins were obtained: one (116 kDa) was recognized by the antibody and one (150 kDa) was not. The 116 kDa protein had an internal decapeptide identical with human beta 1 integrin, and the 150 kDa protein had an internal amino acid sequence belonging to porcine alpha 2 integrin. Therefore, the NaM160-1A3 antibody was directed against porcine beta 1 integrin and allowed the purification of the complex alpha 2 beta 1, also termed Very Late Antigen 2 (VLA-2). It did not recognize human beta 1 integrin.
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Affiliation(s)
- C Richard
- Institut de Transplantation et de Recherche en Transplantation, Institut National de la Santé et de la Recherche Médicale, Unité 437, Nantes, France
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