?(Fig
?(Fig.11 a) often enriched at substrate contact sites (Fig. mouse 3T3 fibroblasts were transfected with MT1-MMP they acquired the ability to spread and migrate on the nonpermissive myelin substrate and to infiltrate into adult rat optic nerve explants. MT1-MMPCtransfected fibroblasts and C6 glioma cells were able to digest bNI-220, one of Biotin-PEG3-amine the most potent CNS myelin inhibitory proteins. Plasma membranes of both MT1-MMPCtransfected fibroblasts and C6 glioma cells inactivated inhibitory myelin Biotin-PEG3-amine extracts, and this activity was sensitive to the same protease inhibitors. Interestingly, pretreatment of CNS myelin with gelatinase A/MMP-2 could not inactivate its inhibitory property. These data imply an important role of MT1-MMP in spreading and migration of glioma cells on white matter constituents in vitro and point to a function of MT1-MMP in the invasive behavior…