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Activation of the G-protein-coupled muscarinic (M3) receptor in human neuroblastoma SH-SY5Y cells is known to lead to phosphoinositol hydrolysis and noradrenaline release. In this study, the effect of carbachol on tyrosine phosphorylation and mitogen-activated protein (MAP) kinase activity in SH-SY5Y cells was examined. Carbachol concentration-dependently induced tyrosine phosphorylation of several proteins, including one of 42 kDa. This tyrosine-phosphorylated 42 kDa protein co-eluted from a Mono Q anion-exchange column with MAP kinase activity and with immunologically detected MAP kinase. Stimulation of tyrosine phosphorylation and activation of MAP kinase were also observed after incubation of cells with phorbol 12-myristate 13-acetate (PMA) and epidermal growth factor (EGF). Down-regulation or inhibition of protein kinase C (PKC) abolished the stimulatory effects of both carbachol and PMA on MAP kinase activity, whereas EGF-stimulated MAP kinase activity remained unaffected. Thus carbachol acting through the muscarinic (M3) receptor PKC-dependently induced tyrosine phosphorylation and activation of a 42 kDa MAP kinase in SH-SY5Y cells, whereas EGF-induced MAP kinase activation occurred independently of PKC.

Stimulation of tyrosine phosphorylation and mitogen-activated-protein (MAP) kinase activity in human SH-SY5Y neuroblastoma cells by carbachol