SAP-controlled T-B cell interactions underlie germinal centre formation.

SAP-controlled T-B cell interactions underlie germinal centre formation.
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DOI:
10.1038/nature07345
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发表时间:
2008-10-09
期刊:
影响因子:
64.8
通讯作者:
Germain, Ronald N.
Germain, Ronald N.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Qi, Hai;Cannons, Jennifer L.;Klauschen, Frederick;Schwartzberg, Pamela L.;Germain, Ronald N.

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长期抗体介导的免疫的产生依赖于生发中心(GC)反应,这需要抗原特异性T淋巴细胞和B淋巴细胞之间的协作。在人类X连锁淋巴增殖性疾病及其基因靶向小鼠模型中,信号淋巴细胞激活分子相关蛋白(SAP,由SH2D1a编码)的功能缺失突变通过一种尚不明确的机制导致生发中心形成的严重缺陷。利用双光子活体成像技术,我们在此表明SAP缺陷选择性地损害了CD4 + T细胞与同源B细胞稳定相互作用的能力,但不影响其与抗原呈递树突状细胞的相互作用。这种选择性缺陷导致抗原特异性B细胞无法接收到足够水平的依赖接触的T细胞辅助以正常扩增,尽管sap - / - T细胞表现出在其他方面有能力的辅助性T细胞的已知特征。此外,由于缺乏与B细胞的稳定相互作用,sap - / - T细胞无法被有效地招募到新生的生发中心并在其中留存以维持生发中心反应。这些结果为SAP缺陷导致的生发中心缺陷提供了一个令人信服的解释,并为体内同源T细胞和B细胞之间的双向通讯提供了新的见解。
Generation of long-term antibody-mediated immunity depends on the germinal centre (GC) reaction, which requires cooperation between antigen-specific T and B lymphocytes. In the human X-linked lymphoproliferative disease and its gene-targeted mouse model, loss-of-function mutations in signalling lymphocyte activation molecule-associated protein (SAP, encoded by SH2D1a) cause a profound defect in GC formation by an as yet unknown mechanism. Using two-photon intravital imaging, here we show that SAP deficiency selectively impairs the ability of CD4+ T cells to stably interact with cognate B cells but not antigen-presenting dendritic cells. This selective defect results in a failure of antigen-specific B cells to receive adequate levels of contact-dependent T cell help to expand normally, despite sap−/− T cells exhibiting the known characteristics of otherwise competent helper T cells. Furthermore, lack of stable interactions with B cells renders sap−/− T cells unable to be efficiently recruited to and retained in a nascent GC to sustain the GC reaction. These results offer a compelling explanation for the GC defect due to SAP deficiency and provide novel insights into the bi-directional communication between cognate T and B cells in vivo.
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