Activation of mTORC1 by leucine is potentiated by branched-chain amino acids and even more so by essential amino acids following resistance exercise

被引:80
作者
Moberg, Marcus [1 ]
Apro, William [1 ]
Ekblom, Bjorn [1 ]
van Hall, Gerrit [2 ,3 ]
Holmberg, Hans-Christer [4 ]
Blomstrand, Eva [1 ,5 ]
机构
[1] Swedish Sch Sport & Hlth Sci, Astrand Lab, Stockholm, Sweden
[2] Univ Copenhagen, Rigshosp, Clin Metabol Core Facil, Copenhagen, Denmark
[3] Univ Copenhagen, Rigshosp, Dept Biomed Sci, Copenhagen, Denmark
[4] Mid Sweden Univ, Dept Hlth Sci, Swedish Winter Sports Res Ctr, Ostersund, Sweden
[5] Karolinska Inst, Dept Physiol & Pharmacol, Stockholm, Sweden
来源
AMERICAN JOURNAL OF PHYSIOLOGY-CELL PHYSIOLOGY | 2016年 / 310卷 / 11期
关键词
4E-BP1; S6K1; BCAA; skeletal muscle; MUSCLE PROTEIN-SYNTHESIS; HUMAN SKELETAL-MUSCLE; P70; S6; KINASE; PHAS-I; DEPENDENT PHOSPHORYLATION; TRANSLATION INITIATION; MAMMALIAN TARGET; MESSENGER-RNA; NEONATAL PIGS; (S/T)P SITES;
D O I
10.1152/ajpcell.00374.2015
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Protein synthesis is stimulated by resistance exercise and intake of amino acids, in particular leucine. Moreover, activation of mammalian target of rapamycin complex 1 (mTORC1) signaling by leucine is potentiated by the presence of other essential amino acids (EAA). However, the contribution of the branched-chain amino acids (BCAA) to this effect is yet unknown. Here we compare the stimulatory role of leucine, BCAA, and EAA ingestion on anabolic signaling following exercise. Accordingly, eight trained volunteers completed four sessions of resistance exercise during which they ingested either placebo, leucine, BCAA, or EAA (including the BCAA) in random order. Muscle biopsies were taken at rest, immediately after exercise, and following 90 and 180 min of recovery. Following 90 min of recovery the activity of S6 kinase 1 (S6K1) was greater than at rest in all four trials (Placebo < Leucine < BCAA < EAA; P < 0.05 time X supplement), with a ninefold increase in the EAA trial. At this same time point, phosphorylation of eukaryotic translation initiation factor 4E (eIF4E)-binding protein 1 (4E-BP1) at Thr(37/46) was unaffected by supplementation, while that of Thr(46) alone exhibited a pattern similar to that of S6K1, being 18% higher with EAA than BCAA. However, after 180 min of recovery this difference between EAA and BCAA had disappeared, although with both these supplements the increases were still higher than with leucine (40%, P < 0.05) and placebo (100%, P < 0.05). In summary, EAA ingestion appears to stimulate translation initiation more effectively than the other supplements, although the results also suggest that this effect is primarily attributable to the BCAA.
引用
收藏
页码:C874 / C884
页数:11
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