Abstract
Clonal, fusing, mouse skeletal muscle cells (C2) were grown to the myotube stage (90% confluence) before they were subjected to isotope-containing serum-free media (3H-proline or 35S-methionine). C2 myotubes secrete and organize a biosynthetically labeled matrix which adheres to the plastic after removal of myotubes with detergent and ammonium hydroxide. When these homotypic-labeled myotube matrices were incubated with myoblast-conditioned media containing high specific activity urokinase-type plasminogen activator, slow, but clearly detectable, release of label occurred. However, degradation of matrix, with solubilization of label, was accelerated sixfold by addition of human plasminogen to diluted myoblast-conditioned media. If protease nexin I, a cellular serine protease inhibitor purified from human fibroblast-conditioned media, was added (0.2 microgram/ml) with plasminogen, inhibition of matrix hydrolysis by 52% occurred. Higher concentrations (0.8 microgram/ml or above) of protease nexin 1 completely inhibited the degradation of extracellular matrix components. A similar protease inhibitor was purified from C2 myotube-conditioned media, and this molecule also inhibited the plasminogen-dependent release of extracellular ma...Continue Reading
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