期刊
MUSCLE & NERVE
卷 55, 期 2, 页码 254-261出版社
WILEY
DOI: 10.1002/mus.25220
关键词
castration; force; knockout; myostatin; orchidectomy; postnatal growth; power; skeletal muscle
资金
- Universite Pierre et Marie Curie (UPMC)
- CNRS
- INSERM
- University Paris Descartes
- Association Francaise contre les Myopathies
Introduction: The effect of constitutive inactivation of the gene encoding myostatin on the gain in muscle performance during postnatal growth has not been well characterized. Methods: We analyzed 2 murine myostatin knockout (KO) models, (i) the Lee model (KOLee) and (ii) the Grobet model (KOGrobet), and measured the contraction of tibialis anterior muscle in situ. Results: Absolute maximal isometric force was increased in 6-month-old KOLee and KOGrobet mice, as compared to wild-type mice. Similarly, absolute maximal power was increased in 6-month-old KOLee mice. In contrast, specific maximal force (relative maximal force per unit of muscle mass was decreased in all 6-month-old male and female KO mice, except in 6-month-old female KOGrobet mice, whereas specific maximal power was reduced only in male KOLee mice. Conclusions: Genetic inactivation of myostatin increases maximal force and power, but in return it reduces muscle quality, particularly in male mice. Muscle Nerve55: 254-261, 2017
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