The complement system and adaptive immunity

被引:93
作者
Fearon, DT [1 ]
机构
[1] Univ Cambridge, Sch Clin Med, Wellcome Trust Immunol Unit, Cambridge CB2 2SP, England
关键词
B lymphocyte; CD19; CD21; CD22; complement;
D O I
10.1006/smim.1998.0137
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
The complement system covalently attaches C3d to microbial antigens which binds to CR2 on B lymphocytes, leading to a markedly enhanced adaptive immune response to that antigen. The enhancement is mediated by the cross-linking of the CR2-CD19 complex to mIg which augments the activation of several intracellular signalling pathways. Two additional receptors of the B lymphocyte, Fc gamma RIIB and CD22, have opposing effects when cross-linked to mIg, the former suppressing signalling by recruiting the inositol phosphatase, SHIP, and the latter by activating the phosphotyrosine phosphatase, SHP-1. Two principles emerge from these studies: innate immunity guides the adaptive immune response, and activation of the B lymphocyte is determined by co-receptors which evaluate the biological characteristics of antigen.
引用
收藏
页码:355 / 361
页数:7
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