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2016 ; 6
(ä): 26802
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Alpha-ketoglutarate promotes skeletal muscle hypertrophy and protein synthesis
through Akt/mTOR signaling pathways
#MMPMID27225984
Cai X
; Zhu C
; Xu Y
; Jing Y
; Yuan Y
; Wang L
; Wang S
; Zhu X
; Gao P
; Zhang Y
; Jiang Q
; Shu G
Sci Rep
2016[May]; 6
(ä): 26802
PMID27225984
show ga
Skeletal muscle weight loss is accompanied by small fiber size and low protein
content. Alpha-ketoglutarate (AKG) participates in protein and nitrogen
metabolism. The effect of AKG on skeletal muscle hypertrophy has not yet been
tested, and its underlying mechanism is yet to be determined. In this study, we
demonstrated that AKG (2%) increased the gastrocnemius muscle weight and fiber
diameter in mice. Our in vitro study also confirmed that AKG dose increased
protein synthesis in C2C12 myotubes, which could be effectively blocked by the
antagonists of Akt and mTOR. The effects of AKG on skeletal muscle protein
synthesis were independent of glutamate, its metabolite. We tested the expression
of GPR91 and GPR99. The result demonstrated that C2C12 cells expressed GPR91,
which could be upregulated by AKG. GPR91 knockdown abolished the effect of AKG on
protein synthesis but failed to inhibit protein degradation. These findings
demonstrated that AKG promoted skeletal muscle hypertrophy via Akt/mTOR signaling
pathway. In addition, GPR91 might be partially attributed to AKG-induced skeletal
muscle protein synthesis.