Attenuation of P38α MAPK Stress Response Signaling Delays the in Vivo Aging of Skeletal Muscle Myofibers and Progenitor Cells

Overview

Journal Aging (Albany NY)

Specialty Geriatrics

Date 2015 Oct 2

PMID 26423835

Citations 11

Authors

John Papaconstantinou

Chen Z Wang

Min Zhang

San Yang

James Deford

Dmitry V Bulavin

Naseem H Ansari

Affiliations

Soon will be listed here.

Abstract

Functional competence and self-renewal of mammalian skeletal muscle myofibers and progenitor cells declines with age. Progression of the muscle aging phenotype involves the decline of juvenile protective factorsi.e., proteins whose beneficial functions translate directly to the quality of life, and self-renewal of progenitor cells. These characteristics occur simultaneously with the age-associated increase of p38α stress response signaling. This suggests that the maintenance of low levels of p38α activity of juvenile tissues may delay or attenuate aging. We used the dominant negative haploinsufficient p38α mouse (DN-p38α(AF/+)) to demonstrate that in vivo attenuation of p38α activity in the gastrocnemius of the aged mutant delays age-associated processes that include: a) the decline of the juvenile protective factors, BubR1, aldehyde dehydrogenase 1A (ALDH1A1), and aldehyde dehydrogenase 2 (ALDH2); b) attenuated expression of p16(Ink4a) and p19(Arf) tumor suppressor genes of the Cdkn2a locus; c) decreased levels of hydroxynonenal protein adducts, expression of COX2 and iNOS; d) decline of the senescent progenitor cell pool level and d) the loss of gastrocnemius muscle mass. We propose that elevated P-p38α activity promotes skeletal muscle aging and that the homeostasis of p38α impacts the maintenance of a beneficial healthspan.

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