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© The Rockefeller University Press, 0021-9525/1998//1749 $5.00
The Journal of Cell Biology, Volume 143, Number 6, , 1998 1749-1760


Article

Release of cAMP Gating by the {alpha}6β4 Integrin Stimulates Lamellae Formation and the Chemotactic Migration of Invasive Carcinoma Cells



Kathleen L. O'Connor, Leslie M. Shaw, and Arthur M. Mercurio

Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215

The {alpha}6β4 integrin promotes carcinoma in-vasion by its activation of a phosphoinositide 3-OH (PI3-K) signaling pathway (Shaw, L.M., I. Rabinovitz, H.H.-F. Wang, A. Toker, and A.M. Mercurio. Cell. 91: 949–960). We demonstrate here using MDA-MB-435 breast carcinoma cells that {alpha}6β4 stimulates chemotactic migration, a key component of invasion, but that it has no influence on haptotaxis. Stimulation of chemotaxis by {alpha}6β4 expression was observed in response to either lysophosphatidic acid (LPA) or fibroblast conditioned medium. Moreover, the LPA-dependent formation of lamellae in these cells is dependent upon {alpha}6β4 expression. Both lamellae formation and chemotactic migration are inhibited or "gated" by cAMP and our results reveal that a critical function of {alpha}6β4 is to suppress the intracellular cAMP concentration by increasing the activity of a rolipram-sensitive, cAMP-specific phosphodiesterase (PDE). This PDE activity is essential for lamellae formation, chemotactic migration and invasion based on data obtained with PDE inhibitors. Although PI3-K and cAMP-specific PDE activities are both required to promote lamellae formation and chemotactic migration, our data indicate that they are components of distinct signaling pathways. The essence of our findings is that {alpha}6β4 stimulates the chemotactic migration of carcinoma cells through its ability to influence key signaling events that underlie this critical component of carcinoma invasion.

Key Words: integrin • migration • cyclic AMP • phosphodiesterase • cytoskeleton



Abbreviations used in this paper: [cAMP]i, intracellular cyclic AMP concentration; DIC, differential–interference contrast; Gi, inhibitory type G protein; IBMX, isobutylmethylxanthine; LPA, lysophosphatidic acid; PDE, phosphodiesterase; PI3-K, phosphoinositide 3-OH kinase.

We would also like to thank M. Conti and S. Iona (Stanford University, Stanford, CA) for their generous contribution of the PDE 4 antibodies, as well as S. Akiyama for the β1 integrin antibody. We also thank R. Falcioni, (Regina Elena Cancer Institute, Rome, Italy), R. Bachelder, I. Rabinovitz, and D. Senger (all three from Beth Israel Deaconess Medical Center, Boston, MA) for their comments and discussions regarding the manuscript.



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