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A p38 MAPK-MEF2C pathway regulates B-cell proliferation.


ABSTRACT: B lymphocytes are an integral part of the adaptive immune system. On antigen binding to the B-cell receptor (BCR), B cells rapidly proliferate and differentiate into antibody-secreting plasma cells. The p38 mitogen-activated protein kinase (MAPK) pathway functions downstream of the BCR to control cell proliferation, but the transcriptional effectors of this pathway in B cells have remained elusive. In the present study, we inactivated Mef2c exclusively in B cells by conditional gene targeting in mice. Loss of MEF2C function resulted in a reduced immune response to antigen, defective germinal center formation, and a severe defect in B-cell proliferation, and we show that MEF2C regulates proliferation in response to BCR stimulation via the p38 MAPK pathway. p38 directly phosphorylates MEF2C via three residues in the C-terminal transactivation domain, establishing MEF2C as a direct transcriptional effector of BCR signaling via p38 MAPK.

SUBMITTER: Khiem D 

PROVIDER: S-EPMC2579379 | biostudies-literature | 2008 Nov

REPOSITORIES: biostudies-literature

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A p38 MAPK-MEF2C pathway regulates B-cell proliferation.

Khiem Dustin D   Cyster Jason G JG   Schwarz John J JJ   Black Brian L BL  

Proceedings of the National Academy of Sciences of the United States of America 20081027 44


B lymphocytes are an integral part of the adaptive immune system. On antigen binding to the B-cell receptor (BCR), B cells rapidly proliferate and differentiate into antibody-secreting plasma cells. The p38 mitogen-activated protein kinase (MAPK) pathway functions downstream of the BCR to control cell proliferation, but the transcriptional effectors of this pathway in B cells have remained elusive. In the present study, we inactivated Mef2c exclusively in B cells by conditional gene targeting in  ...[more]

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