In airway smooth muscle cells ligand binding to the seven-transmembrane endothelin and thrombin receptors stimulates cell growth. Rapid activation of the extracellular regulated kinase 2 and c-Jun NH-terminal kinase groups of mitogen-activated protein kinases was also observed. The results demonstrate a novel mechanism of seven-transmembrane receptor signaling involving activation of the Jun kinase pathway. Receptor coupling to Jun kinase activation may involve heterotrimeric G proteins since the kinase was enzymatically activated in cells treated with aluminum fluoride. The activity of Raf-1, measured by immune complex kinase assay, revealed that platelet-derived growth factor and phorbol 12-myristate 13-acetate both stimulated Raf-1 activity, while thrombin and endothelin did not appreciably stimulate Raf-1. The data suggest that endothelin and thrombin stimulate Raf-1-independent mechanisms of mitogen-activated protein kinase activation. Endothelin- or thrombin-induced activation of mitogen-activated protein kinases was significantly inhibited by activation of cyclic AMP-dependent protein kinase by forskolin. Proliferation of airway smooth muscle cells, measured by incorporation of [H]thymidine into DNA, was also greatly attenuated by forskolin.

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