The MicroRNA miR-191 Supports T Cell Survival Following Common γ Chain Signaling.

Journal Article (Journal Article)

To ensure lifelong immunocompetency, naïve and memory T cells must be adequately maintained in the peripheral lymphoid tissues. Homeostatic maintenance of T cells is controlled by tonic signaling through T cell antigen receptors and common γ chain cytokine receptors. In this study, we identify the highly expressed microRNA miR-191 as a key regulator of naïve, memory, and regulatory T cell homeostasis. Conditional deletion of miR-191 using LckCre resulted in preferential loss of peripheral CD4+ regulatory T cells as well as naïve and memory CD8+ T cells. This preferential loss stemmed from reduced survival following deficient cytokine signaling and STAT5 activation. Mechanistically, insulin receptor substrate 1 (Irs1) is a direct target of miR-191, and dysregulated IRS1 expression antagonizes STAT5 activation. Our study identifies a novel role for microRNAs in fine-tuning immune homeostasis and thereby maintaining the lymphocyte reservoir necessary to mount productive immune responses.

Full Text

Duke Authors

Cited Authors

  • Lykken, EA; Li, Q-J

Published Date

  • November 4, 2016

Published In

Volume / Issue

  • 291 / 45

Start / End Page

  • 23532 - 23544

PubMed ID

  • 27634043

Pubmed Central ID

  • PMC5095408

Electronic International Standard Serial Number (EISSN)

  • 1083-351X

Digital Object Identifier (DOI)

  • 10.1074/jbc.M116.741264


  • eng

Conference Location

  • United States