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A branched-chain amino acid (BCAA) is an amino acid having aliphatic side-chains with a branch (a central carbon atom bound to three or more carbon atoms). Among the proteinogenic amino acids, there are three BCAAs: leucine, isoleucine and valine. Non-proteinogenic BCAAs include norvaline and 2-aminoisobutyric acid. The three proteinogenic BCAAs are among the nine essential amino acids for humans, accounting for 35% of the essential amino acids in muscle proteins and 40% of the preformed amino acids required by mammals. ==Research== Dietary BCAA supplementation has been used clinically to aid in the recovery of burn victims. A 2006 paper suggests that the concept of nutrition supplemented with all BCAAs for burns, trauma, and sepsis should be abandoned for a more promising leucine-only-supplemented nutrition that requires further evaluation. Dietary BCAAs have been used in an attempt to treat some cases of hepatic encephalopathy, but BCAA provides no benefit for this condition. Cota et al.〔(Abstract on sciencemag.org )〕 demonstrated in 2006 that BCAAs, particularly leucine, also affect the mTOR pathway in rats, signaling regions of their brains. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Branched-chain amino acid」の詳細全文を読む スポンサード リンク
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