Molecular mechanisms of avian neural crest cell migration on fibronectin and laminin

Developmental Biology
R PerrisM Bronner-Fraser

Abstract

We have examined the molecular interactions of avian neural crest cells with fibronectin and laminin in vitro during their initial migration from the neural tube. A 105-kDa proteolytic fragment of fibronectin encompassing the defined cell-binding domain (65 kDa) promoted migration of neural crest cells to the same extent as the intact molecule. Neural crest cell migration on both intact fibronectin and the 105-kDa fragment was reversibly inhibited by RGD-containing peptides. The 11.5-kDa fragment containing the RGDS cell attachment site was also able to support migration, whereas a 50-kDa fragment corresponding to the adjacent N-terminal portion of the defined cell-binding domain was unfavorable for neural crest cell movement. In addition to the putative "cell-binding domain," neural crest cells were able to migrate on a 31-kDa fragment corresponding to the C-terminal heparin-binding (II) region of fibronectin, and were inhibited in their migration by exogenous heparin, but not by RGDS peptides. Heparin potentiated the inhibitory effect of RGDS peptides on intact fibronectin, but not on the 105-kDa fragment. On substrates of purified laminin, the extent of avian neural crest cell migration was maximal at relatively low substrat...Continue Reading

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