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Direct helper T cell-induced B cell differentiation involves interaction between T cell antigen CD28 and B cell activation antigen B7.

Abstract：

:Cognate interactions between major histocompatibility complex class II antigen (Ag)-reactive CD4+ T helper (Th) and Ag-presenting B cells induce first the activation of B cells and their subsequent differentiation into Ig-secreting cells (IgSC). The Th cell-associated homodimeric glycoprotein CD28 has been implicated as an important regulator of Th activation. Recently, B cell-associated early activation Ag B7 has been identified as a ligand for the CD28 molecule. In this study, we have examined using monoclonal antibodies (mAb) the roles of CD28 and B7 molecules during the Th-B cell cognate interactions leading to the differentiation of B7+ B cells. Anti-CD28 mAb 9.3 specifically inhibited proliferative responses of CD4+ T cells to both allogeneic B cells and soluble Ag-presenting autologous non-T cells. In addition, anti-CD28 mAb 9.3 inhibited Th-induced differentiation of alloantigen-presenting B cells into ISC. Similar inhibition of both Ag-induced Th activation and B cell differentiation into ISC was observed using mAb BB1 which recognizes a B cell-associated molecule B7. In contrast, non-cognate Th-independent exogenous interleukin 6-induced differentiation of B7+ B cells into ISC was not inhibited by mAb to either molecule. These results clearly demonstrate the involvement of CD28 on Th and its ligand B7 on B cells during cognate Th-B interactions leading to the differentiation of B cells. Furthermore, these results also suggest the development of new mAb-based therapeutic approaches for exaggerated B cell activation associated with certain autoimmune diseases such as systemic lupus erythematosus.

journal_name

Eur J Immunol

journal_title

European journal of immunology

authors

Damle NK,Linsley PS,Ledbetter JA

doi

10.1002/eji.1830210527

keywords:

subject

Has Abstract

pub_date

1991-05-01 00:00:00

pages

1277-82

issue

5

eissn

0014-2980

issn

1521-4141

journal_volume

21

pub_type

杂志文章

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