Aborted germinal center reactions and B cell memory by follicular T cells specific for a B cell receptor V region peptide.

Aborted germinal center reactions and B cell memory by follicular T cells specific for a B cell receptor V region peptide.
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DOI:
10.4049/jimmunol.1002328
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发表时间:
2011-07-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Wysocki LJ
Wysocki LJ
中科院分区:
其他
文献类型:
--
作者:
Heiser RA;Snyder CM;St Clair J;Wysocki LJ

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A fundamental problem in immunoregulation is how CD4+ T cells react to immunogenic peptides derived from the V region of the BCR that are created by somatic mechanisms, presented in MHC II, and amplified to abundance by B cell clonal expansion during immunity. BCR neo Ags open a potentially dangerous avenue of T cell help in violation of the principle of linked Ag recognition. To analyze this issue, we developed a murine adoptive transfer model using paired donor B cells and CD4 T cells specific for a BCR-derived peptide. BCR peptide-specific T cells aborted ongoing germinal center reactions and impeded the secondary immune response. Instead, they induced the B cells to differentiate into short-lived extrafollicular plasmablasts that secreted modest quantities of Ig. These results uncover an immunoregulatory process that restricts the memory pathway to B cells that communicate with CD4 T cells via exogenous foreign Ag.
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