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- W2044192023 abstract "The capacity for skeletal muscle to recover its mass following periods of unloading (regrowth) has been reported to decline with age. Although the mechanisms responsible for the impaired regrowth are not known, it has been suggested that aged muscles have a diminished capacity to sense and subsequently respond to a given amount of mechanical stimuli (mechanosensitivity). To test this hypothesis, extensor digitorum longus muscles from young (2–3 mo) and old (26–27 mo) mice were subjected to intermittent 15% passive stretch (ex vivo) as a source of mechanical stimulation and analyzed for alterations in the phosphorylation of stress-activated protein kinase (p38), ribosomal S6 kinase (p70 S6k ), and the p54 jun N-terminal kinase (JNK2). The results indicated that the average magnitude of specific tension (mechanical stimuli) induced by 15% stretch was similar in muscles from young and old mice. Young and old muscles also revealed similar increases in the magnitude of mechanically induced p38, p70 S6k (threonine/serine 421/424 and threonine 389), and JNK2 phosphorylation. In addition, coincubation experiments demonstrated that the release of locally acting growth factors was not sufficient for the induction of JNK2 phosphorylation, suggesting that JNK2 was activated by a mechanical rather than a mechanical/growth factor-dependent mechanism. Taken together, the results of this study demonstrate that aging does not alter the mechanosensitivity of the p38, p70 S6k , and JNK2 signaling pathways in skeletal muscle." @default.
- W2044192023 created "2016-06-24" @default.
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- W2044192023 date "2005-04-01" @default.
- W2044192023 modified "2023-10-16" @default.
- W2044192023 title "Aging does not alter the mechanosensitivity of the p38, p70<sup>S6k</sup>, and JNK2 signaling pathways in skeletal muscle" @default.
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- W2044192023 doi "https://doi.org/10.1152/japplphysiol.00870.2004" @default.
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