Age-associated repression of type 1 inositol 1, 4, 5-triphosphate receptor impairs muscle regeneration.

Abstract:

:Skeletal muscle mass and power decrease with age, leading to impairment of mobility and metabolism in the elderly. Ca2+ signaling is crucial for myoblast differentiation as well as muscle contraction through activation of transcription factors and Ca2+-dependent kinases and phosphatases. Ca2+ channels, such as dihydropyridine receptor (DHPR), two-pore channel (TPC) and inositol 1,4,5-triphosphate receptor (ITPR), function to maintain Ca2+ homeostasis in myoblasts. Here, we observed a significant decrease in expression of type 1 IP3 receptor (ITPR1), but not types 2 and 3, in aged mice skeletal muscle and isolated myoblasts, compared with those of young mice. ITPR1 knockdown using shRNA-expressing viruses in C2C12 myoblasts and tibialis anterior muscle of mice inhibited myotube formation and muscle regeneration after injury, respectively, a typical phenotype of aged muscle. This aging phenotype was associated with repression of muscle-specific genes and activation of the epidermal growth factor receptor (EGFR)-Ras-extracellular signal-regulated kinase (ERK) pathway. ERK inhibition by U0126 not only induced recovery of myotube formation in old myoblasts but also facilitated muscle regeneration after injury in aged muscle. The conserved decline in ITPR1 expression in aged human skeletal muscle suggests utility as a potential therapeutic target for sarcopenia, which can be treated using ERK inhibition strategies.

journal_name

Aging (Albany NY)

journal_title

Aging

authors

Choi JY,Hwang CY,Lee B,Lee SM,Bahn YJ,Lee KP,Kang M,Kim YS,Woo SH,Lim JY,Kim E,Kwon KS

doi

10.18632/aging.101039

subject

Has Abstract

pub_date

2016-09-21 00:00:00

pages

2062-2080

issue

9

issn

1945-4589

pii

101039

journal_volume

8

pub_type

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