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J. Biol. Chem., Vol. 266, Issue 35, 23856-23862, 12, 1991

The aminosteroid U-73122 inhibits muscarinic receptor sequestration and phosphoinositide hydrolysis in SK-N-SH neuroblastoma cells. A role for Gp in receptor compartmentation

AK Thompson, SP Mostafapour, LC Denlinger, JE Bleasdale and SK Fisher
Neuroscience Laboratory, University of Michigan, Ann Arbor 48104-1687.

The relationship between muscarinic receptor activation of phosphoinositide hydrolysis and the sequestration of cell surface muscarinic receptors has been examined for both intact and digitonin- permeabilized human SK-N-SH neuroblastoma cells. Addition of the aminosteroid 1-[6-[[17 beta-3-methoxyestra-1,3,5(10)-trien-17-yl]amino] hexyl]-1H-pyrrole-2,5-dione (U-73122) to intact cells resulted in the inhibition of oxotremorine-M-stimulated inositol phosphate release and of Ca2+ signaling by greater than 75%. In contrast, when phospholipase C was directly activated by the addition of the calcium ionophore ionomycin, inclusion of U-73122 had little inhibitory effect. Addition of U-73122 to intact cells also inhibited the agonist-induced sequestration of cell surface muscarinic receptors and their subsequent down-regulation with an IC50 value (4.1 microM) similar to that observed for inhibition of inositol phosphate release (3.7 microM). In contrast, when oxotremorine-M-stimulated phosphoinositide hydrolysis was inhibited by depletion of extracellular Ca2+, no reduction in the extent of receptor sequestration was observed. When introduced into digitonin-permeabilized cells, U-73122 more markedly inhibited inositol phosphate release elicited by either oxotremorine-M or guanosine-5'-O- (3-thiotriphosphate) than that induced by added Ca2+. Addition of oxotremorine-M to permeabilized cells resulted in muscarinic receptor sequestration and down-regulation. Both the loss of muscarinic acetylcholine receptors and activation of phosphoinositide hydrolysis in permeabilized cells were inhibited by the inclusion of guanosine-5'- O-(2-thiodiphosphate). The results indicate that the agonist-induced sequestration of muscarinic acetylcholine receptor in SK-N-SH cells requires the involvement of a GTP-binding protein but not the production of phosphoinositide-derived second messenger molecules.
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