Abstract:
:Leukosialin (CD43) is a major glycoprotein of T lymphocytes which has an extracellular domain of 45 nm in length that is heavily O-glycosylated. Monoclonal antibodies (mAb) to the extracellular domain of human leukosialin induce aggregation of T lymphocytes, monocytes and some cell lines that express leukosialin. The aggregation was reported in one case to be inducible by Fab fragments. In the present study, nine mAb specific for rat leukosialin were tested as inducers of thymocyte aggregation and all were effective. The level of aggregation was reduced by metabolic and cytoskeletal inhibitors, by removal of divalent cations and by reducing the temperature from 37 degrees C to 4 degrees C. The aggregation produced by mAb specific for certain epitopes was less sensitive to these inhibitors than aggregation induced by mAb to other epitopes. To examine the requirement for cross-linking, Fab fragments of four of the antibodies were tested and found to be inactive except for those derived from the OX75 mAb. However, OX75 Fab showed a tendency to dimerize, and monomeric OX75 Fab obtained directly after gel filtration was unable to induce aggregation. Thus induction of rat thymocyte aggregation by anti-leukosialin antibodies requires bivalent cross-linking and maximal aggregation is dependent on energy and an intact cytoskeleton. Mechanisms of antibody-induced aggregation are considered and it is proposed that in the case of leukosialin the antibodies may cross-link cells to overcome inherent repulsion between them and that subsequently other adhesion molecules complete the clustering process.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Cyster JG,Williams AFdoi
10.1002/eji.1830221015keywords:
subject
Has Abstractpub_date
1992-10-01 00:00:00pages
2565-72issue
10eissn
0014-2980issn
1521-4141journal_volume
22pub_type
杂志文章abstract::In the present study, we examined whether anti-CD40+IL-4-mediated B cell proliferation and immunoglobulin synthesis is affected by vitamin D (VD) and its low-hypercalcemic analogue EB1089 in Bcells from healthy donors. Analysis of vitamin D receptor (VDR) expression showed that only anti-CD40+IL-4-stimulated, but not ...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/1521-4141(200212)32:12<3395::AID-IMMU3395>
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abstract::Mutations in PTEN-induced kinase 1 (PINK1), a serine/threonine kinase linked to familial early-onset Parkinsonism, compromise mitochondrial integrity and metabolism and impair AKT signaling. As the activation of a naïve T cell requires an AKT-dependent reorganization of a cell's metabolic machinery, we sought to deter...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.201343571
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journal_title:European journal of immunology
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更新日期:1994-12-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章,评审
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更新日期:2008-11-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830150205
更新日期:1985-02-01 00:00:00
abstract::Thymic nurse cells, cortical epithelial cells enclosing 20-200 lymphocytes, were prepared from mouse thymus by enzyme digestion and repetitive sedimentation. Individual nurse cells were then isolated free of any exogenous thymocytes by micromanipulation, and the endogeneous thymocytes released from inside the nurse ce...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830151016
更新日期:1985-10-01 00:00:00
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journal_title:European journal of immunology
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830220909
更新日期:1992-09-01 00:00:00
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journal_title:European journal of immunology
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更新日期:2006-11-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830190226
更新日期:1989-02-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830110605
更新日期:1981-06-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章,评审
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更新日期:2011-05-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830050810
更新日期:1975-08-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.201243109
更新日期:2014-02-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830230805
更新日期:1993-08-01 00:00:00
abstract::Two major histocompatibility complex (MHC) class I-reactive T cell clones derived from H-2b mice, generated against the allogeneic Ld molecule, were found to recognize the H-2b class II mutant Abm12 molecule as well. In addition, these clones also recognize the class II A(s) molecule, and display a class II-dependent ...
journal_title:European journal of immunology
pub_type: 杂志文章
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journal_title:European journal of immunology
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更新日期:1991-06-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
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更新日期:1997-10-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830130810
更新日期:1983-08-01 00:00:00
abstract::The human promyelocytic U937 cells express detectable levels of MHC class II (MHC-II) molecules. Treatment with 12-o--tetradecanoyl phorbol 13-acetate (TPA), inducing macrophage-like differentiation, produces a dramatic decrease of MHC-II expression as result of down-modulation of the activation of immune response gen...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.200425378
更新日期:2005-02-01 00:00:00
abstract::An abnormal protein, from a petient with mu-chain disease has been studied: protein BUR. It is devoid of the F (ab'')2 mu fragment; molecular weight determinations and immunological data identify the protein as a F(c) 5 mu fragment. Similarly, carbohydrate determinations and proteolysis experiments relate it to a Fcmu...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830050306
更新日期:1975-03-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830140910
更新日期:1984-09-01 00:00:00
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journal_title:European journal of immunology
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更新日期:2002-09-01 00:00:00
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journal_title:European journal of immunology
pub_type: 评论,杂志文章
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更新日期:2009-06-01 00:00:00
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journal_title:European journal of immunology
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更新日期:2018-10-01 00:00:00
abstract::We have shown previously that complement factor H (CFH) and complement factor B (CFB) are constitutively expressed by retinal pigment epithelial cells and their production is regulated by inflammatory cytokines, suggesting that the alternative pathway (AP) of complement activation might play a role in retinal inflamma...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.201040323
更新日期:2010-10-01 00:00:00
abstract::The contribution of the costimulatory molecules B7-1 and B7-2 to the in vivo differentiation of Th cells remains controversial. The infection of resistant and susceptible strains of mice with the parasite Leishmania major provides a well-established model for studying in vivo differentiation of CD4+ T cells. We have i...
journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/1521-4141(200206)32:6<1764::AID-IMMU1764>3
更新日期:2002-06-01 00:00:00