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The effects of cholera toxin, pertussis toxin, sodium fluoride and alpha-interferon on prostaglandin production by the guinea-pig endometrium.

The outputs of prostaglandin (PG) F-2 alpha, 6-keto-PGF-1 alpha and PGE-2 from Day-7 and Day-15 guinea-pig endometrium were neither stimulated nor inhibited by cholera toxin and pertussis toxin. This indicates that PG synthesis by guinea-pig endometrium is not controlled by toxin-sensitive G-proteins. Short-term treatment of guinea-pig endometrium in culture with sodium fluoride stimulated PG output, suggesting that endometrial PG synthesis may be regulated by a fluoride-sensitive G-protein. Long-term treatment of guinea-pig endometrium in culture with sodium fluoride inhibited endometrial PG synthesis, and this was due to an inhibition of endometrial protein synthesis. Human alpha-interferon had no inhibitory effect on the outputs of PGF-2 alpha, 6-keto-PGF-1 alpha and PGE-2 from Day-15 guinea-pig endometrium in culture. It appears that the anti-luteolytic factor secreted by guinea-pig conceptus is not an alpha-interferon and is therefore probably different from ovine trophoblast protein-1.