The kinase p38 activated by the metabolic regulator AMPK and scaffold TAB1 drives the senescence of human T cells : Nature Immunology : Nature Publishing Group

The kinase p38 activated by the metabolic regulator AMPK and scaffold TAB1 drives the senescence of human T cells : Nature Immunology : Nature Publishing Group

The kinase p38 activated by the metabolic regulator AMPK and scaffold TAB1 drives the senescence of human T cells

• Alessio Lanna,
• Sian M Henson,
• David Escors
• & Arne N Akbar

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Nature Immunology

 

(2014)

 

doi:10.1038/ni.2981

Received

 

21 February 2014 

Accepted

 

29 July 2014 

Published online

 

24 August 2014

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Abstract

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In T lymphocytes, the mitogen-activated protein kinase (MAPK) p38 regulates pleiotropic functions and is activated by canonical MAPK signaling or the alternative activation pathway downstream of the T cell antigen receptor (TCR). Here we found that senescent human T cells lacked the canonical and alternative pathways for the activation of p38 but spontaneously engaged the metabolic master regulator AMPK to trigger recruitment of p38 to the scaffold protein TAB1, which caused autophosphorylation of p38. Signaling via this pathway inhibited telomerase activity, T cell proliferation and the expression of key components of the TCR signalosome. Our findings identify a previously unrecognized mode for the activation of p38 in T cells driven by intracellular changes such as low-nutrient and DNA-damage signaling (an 'intrasensory' pathway). The proliferative defect of senescent T cells was reversed by blockade of AMPK-TAB1–dependent activation of p38.