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The Journal of Cell Biology, Vol 117, 1101-1107, Copyright © 1992 by The Rockefeller University Press


ARTICLES

Requirement of the integrin beta 3 subunit for carcinoma cell spreading or migration on vitronectin and fibrinogen

DI Leavesley, GD Ferguson, EA Wayner and DA Cheresh
Scripps Research Institute, La Jolla, California 92037.

FG human pancreatic carcinoma cells use integrin alpha v beta 5 as their primary vitronectin receptor since they fail to express integrin alpha v beta 3. These cells are unable to form focal contacts, spread, or migrate on vitronectin but readily do so on collagen in a beta 1 integrin-dependent manner. Transfection of FG cells with a cDNA encoding the integrin beta 3 subunit results in the surface expression of a functional integrin alpha v beta 3 heterodimer providing these cells with novel adhesive and biological properties. Specifically, FG cells expressing beta 3 acquire the capacity to attach and spread on vitronectin as well as fibrinogen with beta 3 localization to focal contacts. Moreover, these cells gain the capacity to migrate through a porous membrane in response to either vitronectin or fibrinogen. These results demonstrate that the beta 3 and beta 5 integrin subunits when associated with alpha v, promote distinct cellular responses to a vitronectin extracellular environment.
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