Published 14 April 2003. doi:10.1083/jcb.200210176
© The Rockefeller University Press,
0021-9525/2003/4/155 $5.00
The Journal of Cell Biology, Volume 161, Number 1, 155-167
Integrin-specific signaling pathways controlling focal adhesion formation and cell migration
Zohreh Mostafavi-Pour1,
Janet A. Askari1,
Scott J. Parkinson2,
Peter J. Parker2,
Tony T.C. Ng3,4 and
Martin J. Humphries1
1 Wellcome Trust Centre for Cell Matrix Research, School of Biological Sciences, University of Manchester, Manchester M13 9PT, UK
2 Protein Phosphorylation Laboratory, Cancer Research UK Laboratories, London WC2A 3PX, UK
3 Randall Centre, New Hunt's House, Guy's Medical School Campus, King's College London, London SE1 1UL, UK
4 Richard Dimbleby/Cancer Research UK Department of Cancer Research, St. Thomas' Hospital, London SE1 7EH, UK
Address correspondence to Martin J. Humphries, School of Biological Sciences, University of Manchester, 2.205 Stopford Building, Oxford Rd., Manchester M13 9PT, UK. Tel.: 44 (0) 161-275-5071. Fax: 44 (0) 161-275-1505. E-mail: martin.humphries{at}man.ac.uk
The fibronectin (FN)-binding integrins
4ß1 and
5ß1 confer different cell adhesive properties, particularly with respect to focal adhesion formation and migration. After analyses of
4+/
5+ A375-SM melanoma cell adhesion to fragments of FN that interact selectively with
4ß1 and
5ß1, we now report two differences in the signals transduced by each receptor that underpin their specific adhesive properties. First,
5ß1 and
4ß1 have a differential requirement for cell surface proteoglycan engagement for focal adhesion formation and migration;
5ß1 requires a proteoglycan coreceptor (syndecan-4), and
4ß1 does not. Second, adhesion via
5ß1 caused an eightfold increase in protein kinase C
(PKC
) activation, but only basal PKC
activity was observed after adhesion via
4ß1. Pharmacological inhibition of PKC
and transient expression of dominant-negative PKC
, but not dominant-negative PKC
or PKC
constructs, suppressed focal adhesion formation and cell migration mediated by
5ß1, but had no effect on
4ß1. These findings demonstrate that different integrins can signal to induce focal adhesion formation and migration by different mechanisms, and they identify PKC
signaling as central to the functional differences between
4ß1 and
5ß1.
Key Words: fibronectin; syndecan; PKC; cytoskeleton; vinculin
The online version of this article includes supplemental material.
* Abbreviations used in this paper: BIM, bisindolylmaleimide; CCBD, central cellbinding domain; FN, fibronectin; HBD, heparin-binding domain; HepII, COOH-terminal heparin binding domain of fibronectin; IIICS, type III connecting segment; PIP2, phosphatidylinositol-4,5-bisphosphate.

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