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Hypertrophy of Rat Skeletal Muscle Is Associated with Increased SIRT1/Akt/mTOR/S6 and Suppressed Sestrin2/SIRT3/FOXO1 Levels. | LitMetric

AI Article Synopsis

Article Abstract

Despite the intensive investigation of the molecular mechanism of skeletal muscle hypertrophy, the underlying signaling processes are not completely understood. Therefore, we used an overload model, in which the main synergist muscles (gastrocnemius, soleus) of the plantaris muscle were surgically removed, to cause a significant overload in the remaining plantaris muscle of 8-month-old Wistar male rats. SIRT1-associated pro-anabolic, pro-catabolic molecular signaling pathways, NAD and HS levels of this overload-induced hypertrophy were studied. Fourteen days of overload resulted in a significant 43% ( < 0.01) increase in the mass of plantaris muscle compared to sham operated animals. Cystathionine-β-synthase (CBS) activities and bioavailable HS levels were not modified by overload. On the other hand, overload-induced hypertrophy of skeletal muscle was associated with increased SIRT1 ( < 0.01), Akt ( < 0.01), mTOR, S6 ( < 0.01) and suppressed sestrin 2 levels ( < 0.01), which are mostly responsible for anabolic signaling. Decreased FOXO1 and SIRT3 signaling ( < 0.01) suggest downregulation of protein breakdown and mitophagy. Decreased levels of NAD, sestrin2, OGG1 ( < 0.01) indicate that the redox milieu of skeletal muscle after 14 days of overloading is reduced. The present investigation revealed novel cellular interactions that regulate anabolic and catabolic processes in the hypertrophy of skeletal muscle.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8305659PMC
http://dx.doi.org/10.3390/ijms22147588DOI Listing

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