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Regulation of T-independent B-cell responses by microRNA-146a.


ABSTRACT: The microRNA, miR-146a, is a negative feedback regulator of the central immune transcription factor, nuclear factor kappa B (NFkB). MiR-146a plays important roles in the immune system, and miR-146a deficient mice show a complex phenotype with features of chronic inflammation and autoimmune disease. In this study, we examined the role of miR-146a in extrafollicular B-cell responses, finding that miR-146a suppresses cellular responses in vivo and in vitro. Gene expression profiling revealed that miR-146a-deficient B-cells showed upregulation of interferon pathway genes, including Traf6, a known miR-146a target. We next interrogated the role of TRAF6 in these B-cell responses, finding that TRAF6 is required for proliferation by genetic and pharmacologic inhibition. Together, our findings demonstrate a novel role for miR-146a and TRAF6 in the extrafollicular B-cell responses, which have recently been tied to autoimmune disease pathogenesis. Our work highlights the pathogenetic role of miR-146a and the potential of pharmacologic inhibition of TRAF6 in autoimmune diseases in which miR-146a is deregulated.

SUBMITTER: King JK 

PROVIDER: S-EPMC9511149 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature

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Regulation of T-independent B-cell responses by microRNA-146a.

King Jennifer K JK   Tran Tiffany M TM   Paing May H MH   Yin Yuxin Y   Jaiswal Amit K AK   Tso Ching-Hsuan CH   Roy Koushik K   Casero David D   Rao Dinesh S DS  

Frontiers in immunology 20220912


The microRNA, miR-146a, is a negative feedback regulator of the central immune transcription factor, nuclear factor kappa B (NFkB). MiR-146a plays important roles in the immune system, and miR-146a deficient mice show a complex phenotype with features of chronic inflammation and autoimmune disease. In this study, we examined the role of miR-146a in extrafollicular B-cell responses, finding that miR-146a suppresses cellular responses <i>in vivo</i> and <i>in vitro</i>. Gene expression profiling r  ...[more]

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