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Molecular and Cellular Biology, March 2004, p. 2573-2583, Vol. 24, No. 6
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.6.2573-2583.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Bidirectional Signaling Links the Abelson Kinases to the Platelet-Derived Growth Factor Receptor

Rina Plattner,1,{dagger} Anthony J. Koleske,2 Andrius Kazlauskas,3 and Ann Marie Pendergast1*

Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina 27710,1 Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520,2 Schepens Eye Research Institute, Harvard Medical School, Boston, Massachusetts 021143

Received 15 September 2003/ Returned for modification 11 November 2003/ Accepted 16 December 2003

The c-Abl nonreceptor tyrosine kinase is activated by growth factor signals such as the platelet-derived growth factor (PDGF) and functions downstream of the PDGF-ß receptor (PDGFR) to mediate biological processes such as membrane ruffling, mitogenesis, and chemotaxis. Here, we show that the related kinase Arg is activated downstream of PDGFRs in a manner dependent on Src family kinases and phospholipase C {gamma}1 (PLC-{gamma}1)-mediated phosphatidylinositol 4,5-bisphosphate (PIP2) hydrolysis, as we showed previously for c-Abl. PIP2, a highly abundant phosphoinositide known to regulate cytoskeletal and membrane proteins, inhibits the tyrosine kinase activities of both Arg and c-Abl in vitro and in cells. We now demonstrate that c-Abl and Arg form inducible complexes with and are phosphorylated by the PDGFR tyrosine kinase in vitro and in vivo. Moreover, c-Abl and Arg, in turn, phosphorylate the PDGFR. We show that c-Abl and Arg exhibit nonredundant functions downstream of the activated PDGFR. Reintroduction of c-Abl into Arg-Abl double-null fibroblasts rescues the ability of PLC-{gamma}1 to increase PDGF-mediated chemotaxis, while reexpression of Arg fails to rescue the chemotaxis defect. These data show that, although both kinases are activated and form complexes with proteins in the PDGFR signaling pathway, only c-Abl functions downstream of PLC-{gamma}1 to mediate chemotaxis.

* Corresponding author. Mailing address: Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC 27710. Phone: (919) 681-8086. Fax: (919) 681-7148. E-mail: pende014{at}mc.duke.edu.

{dagger} Present address: Department of Molecular and Biomedical Pharmacology, University of Kentucky School of Medicine, Lexington, KY 40536-0298.

Molecular and Cellular Biology, March 2004, p. 2573-2583, Vol. 24, No. 6
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.6.2573-2583.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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