Adhesion to fibronectin's EDbdomain induces tyrosine phosphorylation of focal adhesion proteins in Balb/c 3T3 cells

Balb/c 3T3 cell adhesion on substrata coated with fibronectin's (FN) alternatively-spliced ED_b, implicated in some tumor cell systems, and its neighboring type III repeats (III7 and III8) induced intracellular signaling coincident with morphological responses. These events were analysed using minigene-expressed proteins containing various permutations of type III repeats of FN. Cells adherent to the tri-repeat protein 7-ED_b-8 were compared to those attached to the tri-repeat 8-9-10 which can interact with integrins through RGD and its synergistic sequences. Cell adhesion to 7-ED_b-8 generated rapid tyrosine phosphorylation of several intra-cellular proteins (particularly the complex at 120-130 kD), with the overall phosphorylation level and its sensitivity to tyrosine kinase inhibitors similar to responses on the 8-9-10 tri-repeat. This similarity contrasted with the differential morphological responses of cells mediated by these proteins. Further analysis of the kinetics of pho sphorylation through immunoblotting of two focal adhesion proteins, p125FAK and p130cas, revealed a profile for Balb/c 3T3 adhesion to 7-ED_b-8 distinct from that on 8-9-10. ED_b mono-repeat was also more potent for inducing both limited cell spreading and FAK tyrosine phosphorylation than its neigh-boring repeats III7 or III8. Examination of cellular localization of FAK and vinculin showed that cells spread on the 7-ED_b-8 substratum displayed vinculin-positive focal complex-like structures at the cell periphery, in contrast to the classical focal adhesions seen in 8-9-10-adherent cells. These results suggest that ED_b induces cell signaling events, leading to tyrosine phosphorylation of focal adhesion proteins, through a mechanism different from that mediated by integrins recognizing sequences in III8-9-10. ED_b-dependent signaling may have special significance in some tumor systems. © Rapid Science 1998