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Am J Physiol Cell Physiol 281: C1706-C1715, 2001;
0363-6143/01 $5.00
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Vol. 281, Issue 5, C1706-C1715, November 2001

A muscle precursor cell-dependent pathway contributes to muscle growth after atrophy

Patrick O. Mitchell1,2 and Grace K. Pavlath1

1 Department of Pharmacology and 2 Graduate Program in Biochemistry, Cell and Developmental Biology, Emory University, Atlanta, Georgia 30322

Slow-twitch skeletal muscle atrophies greatly in response to unloading conditions. The cellular mechanisms that contribute to the restoration of muscle mass after atrophy are largely unknown. Here, we show that atrophy of the mouse soleus is associated with a 36% decrease in myonuclear number after 2 wk of hindlimb suspension. Myonuclear number is restored to control values during the 2-wk recovery period in which muscle mass returns to normal, suggesting that muscle precursor cells proliferate and fuse with myofibers. Inhibition of muscle precursor cell proliferation by local gamma -irradiation of the hindlimb completely prevents this increase in myonuclear number. Muscle growth occurs normally during the first week in irradiated muscles, but growth during the second week is inhibited, leading to a 50% attenuation in the restoration of muscle mass. Thus early muscle growth occurs independently of an increase in myonuclear number, whereas later growth requires proliferating muscle precursor cells leading to myonuclear accretion. These results suggest that increasing the proliferative capacity of muscle precursor cells may enhance restoration of muscle mass after atrophy.

hindlimb suspension; gamma-irradiation; myonuclear number; satellite cells; soleus


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