Notch and the Survival of Regulatory T Cells: Location Is Everything!

Sci. Signal., 24 July 2012
Vol. 5, Issue 234, p. pe31
DOI: 10.1126/scisignal.2003358

Notch and the Survival of Regulatory T Cells: Location Is Everything!

  1. Lisa M. Minter1,2 and
  2. Barbara A. Osborne1,*
  1. 1Department of Veterinary and Animal Sciences, Program in Molecular and Cellular Biology, University of Massachusetts, Amherst, MA 01003, USA.
  2. 2Department of Biomedical Sciences, University of Illinois College of Medicine, Rockford, IL 61107, USA.
  1. *Corresponding author. E-mail: osborne{at}vasci.umass.edu

Abstract

Signaling through the T cell receptor induces T lymphocytes to divide, differentiate, and perform numerous effector functions. Once activated, effector T cells are exquisitely sensitive to changes in available cytokines, particularly the survival cytokine interleukin-2 (IL-2). Removal of IL-2 rapidly initiates apoptosis in response to cytokine withdrawal. In contrast to effector T cells, regulatory T cells (Tregs) are resistant to apoptosis induced by cytokine withdrawal. A study exploring the differences between these two T cell subsets reveals a role for Notch1 in protecting Tregs from apoptosis. Protection from apoptosis induced by cytokine withdrawal correlated with Notch1 localization in the cytosol of Tregs and its association with phosphatidylinositol 3-kinase and Rictor, a component of the mammalian target of rapamycin complex. Notch1 localization in the nucleus in effector T cells, on the other hand, was correlated with susceptibility to apoptosis induced by cytokine withdrawal. This study highlights how Notch1 can deliver opposing signals in different cellular contexts and suggests that localization of Notch1 can have a substantial influence on life-and-death decisions in T lymphocytes.

Citation:

L. M. Minter and B. A. Osborne, Notch and the Survival of Regulatory T Cells: Location Is Everything!. Sci. Signal. 5, pe31 (2012).
Science Signaling. ISSN 1937-9145 (online), 1945-0877 (print). Pre-2008: Science's STKE. ISSN 1525-8882