PMID: 2503526Aug 1, 1989Paper

The E8 subfragment of laminin promotes locomotion of myoblasts over extracellular matrix

The Journal of Cell Biology
S L GoodmanK von der Mark

Abstract

The locomotion of murine myoblasts over the extracellular matrix components laminin and fibronectin was analyzed using quantitative videomicroscopy, and the organization of the cytoskeleton was observed in parallel immunofluorescence studies. Cells plated on the laminin-nidogen complex locomoted twice as fast as on laminin alone. The main form of translocation on laminin was a jerky cycle of prolonged lamellipod extension followed by rapid (approximately 200- less than 500 microh h-1) movement of the cell body into the extended lamellipod. The locomotion-stimulating activity of laminin resides in the elastase digestion fragment E8, part of the laminin long arm, while the E1-4 fragment containing the three short arms is inactive. Myoblasts moved poorly over fibronectin irrespective of whether high, intermediate, or low coating concentrations were used (approximately 5,000- approximately 10 fmol cm-2). In contrast, the locomotory responses both to laminin and to E8 peaked sharply at coating concentrations approximately 20-50 fmol cm-2 and decreased at higher concentrations. This response corresponds to that expected for a haptotactic stimulant. When cells locomoted over a mixed substrate of laminin and fibronectin, the fibronecti...Continue Reading

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