کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1919272 1535623 2012 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reduced AMPK-ACC and mTOR signaling in muscle from older men, and effect of resistance exercise
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی سالمندی
پیش نمایش صفحه اول مقاله
Reduced AMPK-ACC and mTOR signaling in muscle from older men, and effect of resistance exercise
چکیده انگلیسی

AMP-activated protein kinase (AMPK) is a key energy-sensitive enzyme that controls numerous metabolic and cellular processes. Mammalian target of rapamycin (mTOR) is another energy/nutrient-sensitive kinase that controls protein synthesis and cell growth. In this study we determined whether older versus younger men have alterations in the AMPK and mTOR pathways in skeletal muscle, and examined the effect of a long term resistance type exercise training program on these signaling intermediaries. Older men had decreased AMPKα2 activity and lower phosphorylation of AMPK and its downstream signaling substrate acetyl-CoA carboxylase (ACC). mTOR phosphylation also was reduced in muscle from older men. Exercise training increased AMPKα1 activity in older men, however, AMPKα2 activity, and the phosphorylation of AMPK, ACC and mTOR, were not affected. In conclusion, older men have alterations in the AMPK-ACC and mTOR pathways in muscle. In addition, prolonged resistance type exercise training induces an isoform-selective up regulation of AMPK activity.


► We compared AMPK-ACC and mTOR pathways in muscle from younger versus older subjects.
► We examined resistance exercise training effects on the AMPK and mTOR pathways.
► AMPKα2 activity, ACC and mTOR phosphorylation were down regulated in older men.
► Resistance exercise training increased AMPKα1 activity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanisms of Ageing and Development - Volume 133, Issues 11–12, November–December 2012, Pages 655–664
نویسندگان
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