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Biochem Pharmacol. 1986 Aug 1;35(15):2553-8.

Prostaglandins and cannabis--XVI. Antagonism of delta 1-tetrahydrocannabinol action by its metabolites.


Prior exposure of cells in vitro to delta 1-tetrahydrocannabinol-7-oic acid (delta 1-THC-7-oic acid) reduced the degree of stimulation of prostaglandin synthesis incurred by subsequent treatment with delta 1-THC. The site of action of this inhibitory effect seemed to be on cyclooxygenase and not at the earlier step involving the phospholipase-mediated release of arachidonic acid. delta 1-THC-7-oic acid is a major metabolite of delta 1-THC and has no psychoactivity in humans. Our findings raise the possibility, however, that it may influence the in vivo activities of delta 1-THC by antagonizing its stimulatory action on cellular prostaglandin synthesis.

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