IL‐6 Triggers IL‐21 production by human CD4+ T cells to drive STAT3‐dependent plasma cell differentiation in B cells
Open Access
- 10 April 2012
- journal article
- Published by Wiley in Immunology & Cell Biology
- Vol. 90 (8), 802-811
- https://doi.org/10.1038/icb.2012.17
Abstract
Interleukin (IL)‐21‐producing CD4+T cells are central to humoral immunity. Deciphering the signals that induce IL‐21 production in CD4+ T cells and those triggered by IL‐21 in B cells are, therefore, of importance for understanding the generation of antibody (Ab) responses. Here, we show that IL‐6 increased IL‐21 production by human CD4+ T cells, particularly in those that express the transcriptional regulator B cell lymphoma (BCL)6, which is required in mice for the development of C‐X‐C chemokine receptor type 5 (CXCR5+) IL‐21‐producing T follicular helper (TFH) cells. However, retroviral overexpression of BCL6 in total human CD4+ T cells only transiently increased CXCR5, the canonical TFH‐defining surface marker. We show here that IL‐21 was required for the induction of Ab production by IL‐6. In IL‐21‐treated B cells, signal transducer and activator of transcription (STAT)3 was required for optimal immunoglobulin production and upregulation of PR domain containing 1 (PRDM1+), the master plasma cell factor. These results, therefore, demonstrate the critical importance of STAT3 activation in B cells during IL‐21‐driven humoral immunity and suggest that BCL6 expression, although not sufficient, may serve as a platform for the acquisition of a TFH‐like phenotype by human CD4+ T cells.Keywords
Funding Information
- National Institutes of Health (AI063846)
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