Increased Muscle Mass With Myostatin Deficiency Improves Gains in Bone Strength With Exercise

肌生成抑制素 内科学 内分泌学 肌肉肥大 骨量 瘦体质量 肌肉团 医学 化学 骨质疏松症 体重
作者
Mark W. Hamrick,Ted Samaddar,Catherine Pennington,John R. McCormick
出处
期刊:Journal of Bone and Mineral Research [Oxford University Press]
卷期号:21 (3): 477-483 被引量:101
标识
DOI:10.1359/jbmr.051203
摘要

We tested the hypothesis that increased muscle mass augments increases in bone strength normally observed with exercise. Myostatin-deficient mice, which show increased muscle mass, were exercised along with wildtype mice. Results indicate that increases in bone strength with exercise are greater in myostatin-deficient mice than in wildtype mice, suggesting that the combination of increased muscle mass and physical activity has a greater effect on bone strength than either increased muscle mass or intense exercise alone.Muscle (lean) mass is known to be a significant predictor of peak BMD in young people, and exercise is also found to increase bone mass in growing humans and laboratory animals. We sought to determine if increased muscle mass resulting from myostatin deficiency would enhance gains in bone strength that usually accompany exercise.Male mice lacking myostatin (GDF-8) were used as an animal model showing increased muscle mass. Wildtype and myostatin-deficient mice (n = 10-12 per genotype) were exercised on a treadmill for 30 minutes/day, 5 days/week, for 4 weeks starting at 12 weeks of age. Caged wildtype and myostatin-deficient mice (n = 10-12 per genotype) were included as sedentary controls. Structural and biomechanical parameters were measured from the radius.Ultimate force (F(u)), displacement (D(u)), toughness (energy-to-fracture; U), and ultimate strain (epsilon(u)) increased significantly with exercise in myostatin-deficient mice but not in normal mice. When F(u) is normalized by body mass, exercised myostatin-deficient mice show an increase in relative bone strength of 30% compared with caged controls, whereas exercised wildtype mice do not show a significant increase in ultimate force relative to caged controls. Relative to body weight, the radii of exercised myostatin-deficient mice are >25% stronger than those of exercised normal mice.Increased muscle mass resulting from inhibition of myostatin function improves the positive effects of exercise on bone strength.
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