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Published 14 October 2002. doi:10.1083/jcb.200202092
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© The Rockefeller University Press, 0021-9525/2002/10/123 $5.00
The Journal of Cell Biology, Volume 159, Number 1, 123-134


Article

Myogenic specification of side population cells in skeletal muscle



Atsushi Asakura1, Patrick Seale1,2, Adele Girgis-Gabardo2 and Michael A. Rudnicki1,2

1 Molecular Medicine Program, Ottawa Health Research Institute, Ottawa, Ontario, K1H 8L6 Canada
2 Department of Biology, McMaster University, Hamilton, Ontario, L8S 4K1 Canada

Address correspondence to Michael A. Rudnicki, Molecular Medicine Program, Ottawa Health Research Institute, 501 Smyth Rd., Ottawa, Ontario, K1H 8L6 Canada. Tel.: (613) 739-6740. Fax: (613) 737-8803. E-mail: mrudnicki{at}ohri.ca

Skeletal muscle contains myogenic progenitors called satellite cells and muscle-derived stem cells that have been suggested to be pluripotent. We further investigated the differentiation potential of muscle-derived stem cells and satellite cells to elucidate relationships between these two populations of cells. FACS® analysis of muscle side population (SP) cells, a fraction of muscle-derived stem cells, revealed expression of hematopoietic stem cell marker Sca-1 but did not reveal expression of any satellite cell markers. Muscle SP cells were greatly enriched for cells competent to form hematopoietic colonies. Moreover, muscle SP cells with hematopoietic potential were CD45 positive. However, muscle SP cells did not differentiate into myocytes in vitro. By contrast, satellite cells gave rise to myocytes but did not express Sca-1 or CD45 and never formed hematopoietic colonies. Importantly, muscle SP cells exhibited the potential to give rise to both myocytes and satellite cells after intramuscular transplantation. In addition, muscle SP cells underwent myogenic specification after co-culture with myoblasts. Co-culture with myoblasts or forced expression of MyoD also induced muscle differentiation of muscle SP cells prepared from mice lacking Pax7 gene, an essential gene for satellite cell development. Therefore, these data document that satellite cells and muscle-derived stem cells represent distinct populations and demonstrate that muscle-derived stem cells have the potential to give rise to myogenic cells via a myocyte-mediated inductive interaction.

Key Words: stem cell; satellite cell; Pax7; hematopoiesis; Sca-1


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