Inhibition by gossypol of tumor promoter-induced arachidonic acid metabolism in rat peritoneal macrophages.
Rat peritoneal macrophages were prelabeled with [3H]arachidonic acid. The release of radioactivity into the medium was increased by treatment with TPA-type tumor promoters, such as TPA, teleocidin and aplysiatoxin, and the non-TPA-type tumor promoter, thapsigargin. Gossypol, at concentrations of 3 and 10 microM, inhibited the release of radioactivity stimulated by both types of tumor promoter, although the mechanism of stimulation of arachidonic acid metabolism is different in the two types of tumor promoter. Stimulation of prostaglandin E2 production by these tumor promoters was also inhibited by treatment with gossypol. Calcium ionophore A23187-stimulated release of radioactivity and prostaglandin E2 production were also inhibited by gossypol treatment. The mechanism of inhibition by gossypol of prostaglandin E2 production is discussed.
D000818:Animals; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000378:metabolism*; D000001:Calcimycin; D015232:Dinoprostone; D006072:Gossypol / Q000494:pharmacology*; D008264:Macrophages / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D010529:Peritoneal Cavity / Q000166:cytology; D010936:Plant Extracts; D011458:Prostaglandins E / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D051381:Rats; D011919:Rats, Inbred Strains; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*; D019284:Thapsigargin
D001095:Arachidonic Acids; D010936:Plant Extracts; D011458:Prostaglandins E; D016718:Arachidonic Acid; D000001:Calcimycin; D019284:Thapsigargin; D015232:Dinoprostone; D006072:Gossypol; D013755:Tetradecanoylphorbol Acetate