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First published online 18 March 2008
doi: 10.1242/jcs.018713

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Transforming signals resulting from sustained activation of the PDGFβ receptor in mortal human fibroblasts

Center for Immunology and Microbial Disease, Albany Medical College, MC-151, 47 New Scotland Avenue, Albany, NY 12208, USA

^* Author for correspondence (e-mail: pettil{at}mail.amc.edu)

Accepted 14 January 2008

The platelet-derived growth factor β receptor (PDGFβR) plays an important role in proliferation and motility of fibroblasts. We have been investigating the effects of sustained PDGFβR activation in mortal human diploid fibroblasts (HDFs), which are typically difficult to transform. We have previously shown that the bovine papillomavirus E5 protein, through its ability to crosslink and constitutively activate the PDGFβR, induces morphological transformation, enhanced growth and loss of contact inhibition (focus formation) in HDFs. Here, we characterized two E5 mutants as being severely defective for focus formation but still competent for enhanced growth, suggesting that proliferation is insufficient for loss of contact inhibition. These E5 mutants were then used in a comparative study to distinguish the PDGFβR signaling intermediates required for the enhanced growth phenotype from those required for focus formation. Our data suggested that a PI 3-kinase (PI3K)-AKT-cyclin D3 pathway, a Grb2-Gab1-SHP2 complex and JNK played a role in the enhanced growth phenotype. However, a SHP2-p66Shc-p190BRhoGAP complex and ROCK were implicated exclusively in focus formation. We speculate that a SHP2-p66Shc-p190BRhoGAP signaling complex recruited to the activated PDGFβR promotes a distinct Rho-dependent process required for focus formation but not growth of HDFs.

Key words: PDGF receptor, Signaling, Transformation

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