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Published online 8 September 2003. doi:10.1083/jcb.200207056
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© The Rockefeller University Press, 0021-9525/2003/9/1135 $5.00
The Journal of Cell Biology, Volume 162, Number 6, 1135-1147


Article

Myostatin negatively regulates satellite cell activation and self-renewal



Seumas McCroskery1,2, Mark Thomas1, Linda Maxwell2, Mridula Sharma1 and Ravi Kambadur1

1 Animal Genomics, AgResearch, Hamilton 2015, New Zealand
2 Department of Pathology, University of Auckland, Auckland 1020, New Zealand

Address correspondence to Ravi Kambadur, Animal Genomics, AgResearch, East Street, Hamilton 2015, New Zealand. Tel.: 0064-7-838-5193. Fax: 0064-7-838-5536. email: Ravi.Kambadur{at}agresearch.co.nz

Satellite cells are quiescent muscle stem cells that promote postnatal muscle growth and repair. Here we show that myostatin, a TGF-ß member, signals satellite cell quiescence and also negatively regulates satellite cell self-renewal. BrdU labeling in vivo revealed that, among the Myostatin-deficient satellite cells, higher numbers of satellite cells are activated as compared with wild type. In contrast, addition of Myostatin to myofiber explant cultures inhibits satellite cell activation. Cell cycle analysis confirms that Myostatin up-regulated p21, a Cdk inhibitor, and decreased the levels and activity of Cdk2 protein in satellite cells. Hence, Myostatin negatively regulates the G1 to S progression and thus maintains the quiescent status of satellite cells. Immunohistochemical analysis with CD34 antibodies indicates that there is an increased number of satellite cells per unit length of freshly isolated Mstn-/- muscle fibers. Determination of proliferation rate suggests that this elevation in satellite cell number could be due to increased self-renewal and delayed expression of the differentiation gene (myogenin) in Mstn-/- adult myoblasts. Taken together, these results suggest that Myostatin is a potent negative regulator of satellite cell activation and thus signals the quiescence of satellite cells.

Key Words: myostatin; GDF-8; satellite cell; quiescence; MyoD


M. Sharma and R. Kambadur are co-senior authors.

Abbreviations used in this paper: DM, differentiation medium; E, embryonic day; FM, fiber medium; GM, growth medium.


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