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Am J Physiol Cell Physiol 282: C899-C906, 2002. First published November 14, 2001; doi:10.1152/ajpcell.00341.2001
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Vol. 282, Issue 4, C899-C906, April 2002

Satellite cell proliferation and differentiation during postnatal growth of porcine skeletal muscle

N. T Mesires1 and M. E. Doumit1,2

1 Department of Food Science and Human Nutrition and 2 Department of Animal Science, Michigan State University, East Lansing, Michigan 48824

Age-related changes in satellite cell proliferation and differentiation during rapid growth of porcine skeletal muscle were examined. Satellite cells were isolated from hindlimb muscles of pigs at 1, 7, 14, and 21 wk of age (4 animals/age group). Satellite cells were separated from cellular debris by using Percoll gradient centrifugation and were adsorbed to glass coverslips for fluorescent immunostaining. Positive staining for neural cell adhesion molecule (NCAM) distinguished satellite cells from nonmyogenic cells. The proportion of NCAM-positive cells (satellite cells) in isolates decreased from 1 to 7 wk of age. Greater than 77% of NCAM-positive cells were proliferating cell nuclear antigen positive at all ages studied. Myogenin-positive satellite cells decreased from 30% at 1 wk to 14% at 7 wk of age and remained at constant levels thereafter. These data indicate that a high percentage of satellite cells remain proliferative during rapid postnatal muscle growth. The reduced proportion of myogenin-positive cells during growth may reflect a decrease in the proportion of differentiating satellite cells or accelerated incorporation of myogenin-positive cells into myofibers.

proliferating cell nuclear antigen; myogenin; DNA accretion


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