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Vol. 285, Issue 2, 844-852, May 1998

Inhibition of Platelet-Derived Growth Factor and Epidermal Growth Factor Receptor Signaling Events after Treatment of Cells with Specific Synthetic Inhibitors of Tyrosine Kinase Phosphorylation

Kenneth E. Lipson, Long Pang, L. Julie Huber, Hui Chen, Jian-Ming Tsai, Peter Hirth, Aviv Gazit, Alexander Levitzki and Gerald Mcmahon

SUGEN, Inc., Redwood City, California (K.E.L., L.P., H.C., J.-M.T., P.H., G.M.); Department of Biology, Whitehead Institute, Massachusetts Institute of Technology, Cambridge, Massachussetts (L.J.H.) and Department of Biological Chemistry, Hebrew University of Jerusalem, Jerusalem, Israel (A.G., A.L.)

The receptor kinase activity associated with the epidermal growth factor (EGF) receptor and platelet-derived growth factor (PDGF) receptor plays an important role in ligand-induced signaling events. The effect of specific, synthetic chemical inhibitors of PDGF- and EGF-mediated receptor tyrosine autophosphorylation on receptor signaling were examined in NIH 3T3 cells overexpressing PDGF or EGF receptors. Specific inhibition of ligand-dependent receptor autophosphorylation, PI3K activation, mitogen-activated protein kinase (MAPK) activation, cyclin E-associated kinase activity and cell proliferation was measured after treatment of cells with these inhibitors. A synthetic PDGF receptor kinase inhibitor exhibited specific inhibitory properties when tested for PDGF-induced receptor autophosphorylation, MAPK activity, PI3K activation, entry into S phase and cyclin E-associated kinase activity. A synthetic EGF receptor kinase inhibitor showed selective inhibitory properties when tested for EGF-induced receptor autophosphorylation, MAPK activation, PI3K activation, entry into S phase and cyclin E-associated kinase activity. In both cases, these compounds were found to be effective as inducers of growth arrest and accumulation of cells in the G1 phase of the cell cycle after ligand treatment. However, at high concentrations, the EGF receptor kinase inhibitor was observed to exhibit some nonspecific effects as demonstrated by attenuation of PDGF-induced receptor autophosphorylation and cell cycle progression. This demonstrates that it is critical to use the lowest concentration of such an inhibitor that will alter the response under investigation, to have confidence that the conclusions derived from the use of such inhibitor are valid. We conclude that these experimental parameters signify useful end points to measure the relative selectivity of tyrosine kinase inhibitors that affect receptor-mediated signal transduction.

0022-3565/98/2852-0844$03.00/0
THE JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS
Copyright © 1998 by The American Society for Pharmacology and Experimental Therapeutics


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