title: Prostaglandins and cannabis--XVI. Antagonism of delta 1-tetrahydrocannabinol action by its metabolites.
abstract: 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.
mesh_terms: D000818:Animals; D000893:Anti-Inflammatory Agents / Q000494:pharmacology; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000378:metabolism; D016861:Cyclooxygenase Inhibitors; D015232:Dinoprostone; D013759:Dronabinol / Q000031:analogs & derivatives* / Q000037:antagonists & inhibitors* / Q000378:metabolism / Q000494:pharmacology; D006801:Humans; D051379:Mice; D008815:Mice, Inbred Strains; D011458:Prostaglandins E / Q000096:biosynthesis; D013931:Thromboxanes / Q000096:biosynthesis
chemical_list: D000893:Anti-Inflammatory Agents; D001095:Arachidonic Acids; D016861:Cyclooxygenase Inhibitors; D011458:Prostaglandins E; D013931:Thromboxanes; D016718:Arachidonic Acid; C016780:11-nor-delta(9)-tetrahydrocannabinol-9-carboxylic acid; D013759:Dronabinol; D015232:Dinoprostone