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Muscarinic receptors transform NIH 3T3 cells through a Ras-dependent signalling pathway inhibited by the Ras-GTPase-activating protein SH3 domain.

Department of Microbiology and Molecular Genetics, University of Vermont College of Medicine, Burlington 05405-0068.

ABSTRACT

Expression of certain subtypes of human muscarinic receptors in NIH 3T3 cells provides an agonist-dependent model of cellular transformation by formation of foci in response to carbachol. Although focus formation correlates with the ability of the muscarinic receptors to activate phospholipase C, the actual mitogenic signal transduction pathway is unknown. Through cotransfection experiments and measurement of the activation state of native and epitope-tagged Ras proteins, the contributions of Ras and Ras GTPase-activating protein (Ras-GAP) to muscarinic receptor-dependent transformation were defined. Transforming muscarinic receptors were able to activate Ras, and such activation was required for transformation because focus formation was inhibited by coexpression of either Ras with a dominant-negative mutation or constructs of Ras-GAP that include the catalytic domain. Coexpression of the N-terminal region of GAP or of its isolated SH3 (Src homology 3) domain, but not its SH2 domain, was also sufficient to suppress muscarinic receptor-dependent focus formation. Point mutations at conserved residues in the Ras-GAP SH3 domain reversed its action, leading to an increase in carbachol-dependent transformation. The inhibitory effect of expression of the Ras-GAP SH3 domain occurs proximal to Ras activation and is selective for the mitogenic pathway activated by carbachol, as cellular transformation by either v-Ras or trkA/nerve growth factor is unaffected.

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