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IgD receptor-mediated signal transduction in T cells.

Abstract：

:Upregulation of immunoglobulin D-specific receptors (IgD-R) on CD4+ T cells may facilitate their interaction with specific carbohydrate moieties uniquely associated with membrane IgD on B cells. Previous studies have shown that upregulation of IgD-R facilitates cognate T-B cell interactions by mediating bidirectional signaling resulting in increased antibody responses and clonal expansion of antigen-specific T cells. Murine T hybridoma cells, 7C5, constitutively express IgD-R, as has been confirmed by staining with biotinylated IgD. Earlier studies have shown that inhibitors of protein tyrosine kinase (PTK) completely prevented upregulation of IgD-R in response to oligomeric IgD, suggesting that cross-linking of IgD-R may induce signal transduction and functional consequences through one or more PTK activation pathways, leading to upregulation of IgD-R. In the present study we show that cross-linking of IgD-R by oligomeric IgD indeed results in (a) T cell activation as seen by tyrosine phosphorylation of several intracellular proteins, (b) tyrosine phosphorylation of p56 Lck and PLC-gamma in 7C5 T hybridoma cells, and (c) phosphorylation of an approximately 29-kDa band that exhibits strong affinity for IgD. We analyzed tyrosine phosphorylation of p56 Lck and PLC-gamma in BALB/c splenic T cells that were exposed to oligomeric IgD both in vivo and in vitro. In vitro cross-linking as well as in vivo followed by in vitro cross-linking of IgD-R resulted in enhanced phosphorylation of p56 Lck and moderate tyrosine phosphorylation of PLC-gamma. These results suggest that interactions between IgD-R and IgD mediate signal transduction and support our previous findings that IgD-R+ T cells enhance cognate T cell-B cell interactions and antibody production.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Lakshmi Tamma SM,Wu Y,Toporovsky I,Lima V,Coico RF

doi

10.1006/cimm.2000.1747

subject

Has Abstract

pub_date

2001-02-01 00:00:00

pages

110-7

issue

2

eissn

0008-8749

issn

1090-2163

pii

S0008-8749(00)91747-7

journal_volume

207

pub_type

杂志文章

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