Title |
Branched-chain amino acids administration suppresses endurance exercise-related activation of ubiquitin proteasome signaling in trained human skeletal muscle
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Published in |
The Journal of Physiological Sciences, December 2016
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DOI | 10.1007/s12576-016-0506-8 |
Pubmed ID | |
Authors |
Evgeny A. Lysenko, Tatiana F. Vepkhvadze, Egor M. Lednev, Olga L. Vinogradova, Daniil V. Popov |
Abstract |
We tested whether post exercise ingestion of branched-chain amino acids (BCAA < 10 g) is sufficient to activate signaling associated with muscle protein synthesis and suppress exercise-induced activation of mechanisms associated with proteolysis in endurance-trained human skeletal muscle. Nine endurance-trained athletes performed a cycling bout with and without BCAA ingestion (0.1 g/kg). Post exercise ACC(Ser79/222) phosphorylation (endogenous marker of AMPK activity) was increased (~3-fold, P < 0.05) in both sessions. No changes were observed in IGF1 mRNA isoform expression or phosphorylation of the key anabolic markers - p70S6K1(Thr389) and eEF2(Thr56) - between the sessions. BCAA administration suppressed exercise-induced expression of mTORC1 inhibitor DDIT4 mRNA, eliminated activation of the ubiquitin proteasome system, detected in the control session as decreased FOXO1(Ser256) phosphorylation (0.83-fold change, P < 0.05) and increased TRIM63 (MURF1) expression (2.4-fold, P < 0.05). Therefore, in endurance-trained human skeletal muscle, post exercise BCAA ingestion partially suppresses exercise-induced expression of PGC-1a mRNA, activation of ubiquitin proteasome signaling, and suppresses DDIT4 mRNA expression. |
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Congo | 1 | 9% |
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Unknown | 5 | 45% |
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Scientists | 1 | 9% |
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Geographical breakdown
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Student > Bachelor | 10 | 16% |
Researcher | 9 | 14% |
Student > Master | 6 | 9% |
Other | 3 | 5% |
Other | 6 | 9% |
Unknown | 20 | 31% |
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Nursing and Health Professions | 2 | 3% |
Other | 9 | 14% |
Unknown | 20 | 31% |