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Cell Growth & Differentiation Vol. 12, 551-561, November 2001
© 2001 American Association for Cancer Research

Regulation of Extracellular Signal-regulated Kinase Activity by p120 RasGAP Does Not Involve Its Pleckstrin Homology or Calcium-dependent Lipid Binding Domains but Does Require These Domains to Regulate Cell Proliferation1

Jackie A. Koehler and Michael F. Moran2

Banting and Best Department of Medical Research, Medical Genetics, University of Toronto [J. A. K.], and MDS Proteomics, Inc. [M. F. M.], Toronto, Ontario M9W 7H4, Canada

The gene encoding for p120 RasGAP, has been disrupted in mice (M. Henkemeyer et al., Nature (Lond.), 377: 695–701, 1995).In this study, using fibroblasts derived from these mouse embryos (Gap-/-; P. van der Geer et al., Mol. Cell Biol., 17: 1840–1847, 1997), we demonstrate that mitogen-activated protein kinase (MAPK) activation is prolonged after epidermal growth factor (EGF), but not lysophosphatidic acid, stimulation as compared with wild-type cells. Furthermore, these cells exhibited a moderate increase in their proliferative rate and saturation density, as well as a limited ability to form colonies in soft agar. Stable cell lines expressing full-length p120GAP not only restored the ability to down-regulate MAPK after EGF stimulation but also lowered their saturation densities. Similarly, expression of p120GAP, missing either its pleckstrin homology (PH) or its calcium-dependent lipid binding (CaLB)/C2 domain, restored MAPK down-regulation and retained the ability to associate with p190 RhoGAP and to be phosphorylated by v-src but exhibited higher saturation densities similar to Gap-/- cells. Our results, therefore, suggest that p120GAP functions not only by down-regulating the Ras/MAPK pathway after growth factor stimulation but is also important in regulating cell proliferation that involves its PH and CaLB domains.




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Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 2001 by the American Association of Cancer Research.