Regulation
Little is known of the regulation of satellite cells. Whilst together PAX3 and PAX7 currently form the definitive satellite markers, Pax genes are notoriously poor transcriptional activators. The dynamics of activation and quiesence and the induction of the myogenic program through the myogenic regulatory factors, Myf5, MyoD, myogenin, and MRF4 remains to be determined.
There is some research indicating that satellite cells are negatively regulated by a protein called myostatin. Increased levels of myostatin up-regulate a cyclin-dependent kinase inhibitor called p21 and thereby induce the differentiation of satellite cells.
Read more about this topic: Myosatellite Cell
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