Redirection of B cell responsiveness by transforming growth factor beta receptor

Proceedings of the National Academy of Sciences of the United States of America
Jurgen RoesBalthazar B Cazac

Abstract

The multifunctional transforming growth factor beta receptor (TbetaR) ligand pair plays a central role in the regulation of lymphocyte homeostasis and prevention of autoimmunity. Although the mechanisms underlying the induction of transcriptional modulators by TbetaR have been studied in considerable detail, relatively little is known about the regulatory pathways targeted. To shed light on the mechanisms involved in negative regulation of B cell responses we identified TbetaR-dependent transcriptome changes by comparative gene expression profiling of normal and TbetaR-deficient primary B cells. The data reveal TbetaR-mediated induction of inhibitors of antigen receptor signaling (Ship-1, CD72) as well as inhibitors of the Jak/Stat pathway and signaling by means of Toll-like receptors (SOCS1,3). These inhibitory effects are complemented by induction of antiproliferative transcription factors. In contrast to this inhibition, G protein-coupled receptors such as CXCR4 and agonists mediating Ca2+ flux (inositol trisphosphate receptor subtype 2) are induced by TbetaR, indicating enhancement of the Ca2+ storage/ release system and chemotactic responses. Suppression of proapoptotic genes suggests support of cell survival. Confirming t...Continue Reading

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