期刊
METABOLISM-CLINICAL AND EXPERIMENTAL
卷 62, 期 1, 页码 144-151出版社
W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1016/j.metabol.2012.07.003
关键词
mTOR; Autophagy; FSR
资金
- NIH/National Institute of Arthritis and Musculoskeletal and Skin Diseases [R01 AR049877]
- NIH/National Institute on Aging [P30 AG024832]
- NIH [T32-HD07539]
- NIH/National Center for Research Resources [1UL1RR029876]
- NIDRR/National Institute on Disability and Rehabilitation Research [H133P110012]
Administration of the mTORC1 inhibitor, rapamycin, to humans blocks the increase in skeletal muscle protein synthesis in response to resistance exercise or amino acid ingestion. Objective. To determine whether rapamycin administration influences basal post-absorptive protein synthesis or breakdown in human skeletal muscle. Materials/Methods. Six young (26 +/- 2 years) subjects were studied during two separate trials, in which each trial was divided into two consecutive 2h basal periods. The trials were identical except during one trial a single oral dose (16 mg) of rapamycin was administered immediately prior to the second basal period. Muscle biopsies were obtained from the vastus lateralis at 0, 2, and 4h to examine protein synthesis, mTORC1 signaling, and markers of autophagy (LC3B-I and LC3B-II protein) associated with each 2h basal period. Results. During the Control trial, muscle protein synthesis, whole body protein breakdown (phenylalanine Ra), mTORC1 signaling, and markers of autophagy were similar between both basal periods (p>0.05). During the Rapamycin trial, these variables were similar to the Control trial (p>0.05) and were unaltered by rapamycin administration (p>0.05). Thus, post-absorptive muscle protein metabolism and mTORC1 signaling were not affected by rapamycin administration. Conclusions. Short-term rapamycin administration may only impair protein synthesis in human skeletal muscle when combined with a stimulus such as resistance exercise or increased amino acid availability. (C) 013 Elsevier Inc. All rights reserved.
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