期刊
JOURNAL OF APPLIED PHYSIOLOGY
卷 110, 期 2, 页码 555-560出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/japplphysiol.00962.2010
关键词
limb immobilization; hind-limb suspension; myogenesis; akt signaling; muscle protein synthesis
资金
- Medical Research Council
- Biotechnology and Biological Sciences Research Council (BBSRC)
- Dunhill Medical Trust
- BBSRC [BB/G011435/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/G011435/1] Funding Source: researchfish
Marimuthu K, Murton AJ, Greenhaff PL. Mechanisms regulating muscle mass during disuse atrophy and rehabilitation in humans. J Appl Physiol 110: 555-560, 2011. First published October 28, 2010; doi: 10.1152/japplphysiol.00962.2010.-Muscle mass loss accompanies periods of bedrest and limb immobilization in humans and requires rehabilitation exercise to effectively restore mass and function. Although recent evidence points to an early and transient rise in muscle protein breakdown contributing to this decline in muscle mass, the driving factor seems to be a reduction in muscle protein synthesis, not least in part due to the development of anabolic resistance to amino acid provision. Although the AKT signaling pathway has been identified in small animals as central to the regulation of muscle protein synthesis, several studies in humans have now demonstrated a disassociation between AKT signaling and muscle protein synthesis during feeding, exercise, and immobilization, suggesting that the mechanisms regulating protein synthesis in human skeletal muscle are more complex than initially thought (at least in non-inflammatory states). During rehabilitation, exercise-induced myogenesis may in part be responsible for the recovery of muscle mass. Rapid and sustained exercise-induced suppression of myostatin mRNA expression, that precedes any gain in muscle mass, points to this, along with other myogenic proteins, as being potential regulators of muscle regeneration during exercise rehabilitation in humans.
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