Abstract
Primary cultures of human myogenic stem cells (satellite cells) mimic myogenic differentiation. During this process, the expression of the components of the plasminogen activation system underwent modulation. Activities and mRNA levels of tissue-type and urokinase-type plasminogen activator were increased in a reproducible pattern during differentiation. A modulation of the mRNA level of PAI-2 was also observed. Human satellite cells expressed a urokinase receptor and also the mRNA level of this component underwent modulation. With the exception of PAI-1 mRNA, the level of all mRNAs increased from Day 4 to Day 8, i.e., just before myoblasts fusion, and then remained high at later stages. The modulation of the plasminogen activating activity indicates that this system is directly involved in the fusion process of myogenic differentiation.
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