Abstract
The release of arachidonic acid from mouse peritoneal and S49 cells induced by Δ 1-tetrahydrocannabinol was found to be altered by prior exposure of the cells to either pertussis toxin or cholera toxin. The stable analogs of GTP and GDP, GTP-γ-S and GDP-β-S, were also effective in changing the extent of arachidonate release in saponin-treated cells. GDP- β-S essentially abolished the THC response, while GTP- γ-S showed effects mainly on vehicle-treated cells. The cataleptic action of THC in intact mice which is mediated by eicosanoids was also attenuated by pertussis toxin pretreatment. It is suggested that the THC receptor is coupled to phospholipases through one or more G-proteins and that adenylate cyclase probably does not have a role in this mechanism.
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