期刊
NATURE IMMUNOLOGY
卷 11, 期 12, 页码 1110-U132出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ni.1954
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资金
- German Academic Exchange Service
- German Research Foundation
- Canadian Institutes of Health Research [MFE-98574]
- US National Institutes of Health [AI047231, AI040215, AI071182]
B lymphocytes differentiate into antibody-secreting cells under the antigen-specific control of follicular helper T cells (T-FH cells). Here we demonstrate that isotype-switched plasma cells expressed major histocompatibility complex (MHC) class II, the costimulatory molecules CD80 and CD86, and the intracellular machinery required for antigen presentation. Antigen-specific plasma cells accessed, processed and presented sufficient antigen in vivo to induce multiple helper T cell functions. Notably, antigen-primed plasma cells failed to induce interleukin 21 (IL-21) or the transcriptional repressor Bcl-6 in naive helper T cells and actively decreased these key molecules in antigen-activated T-FH cells. Mice lacking plasma cells showed altered T-FH cell activity, which provided evidence of this negative feedback loop. Hence, antigen presentation by plasma cells defines a previously unknown layer of cognate regulation that limits the antigen-specific T-FH cell program that controls ongoing B cell immunity.
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