title: Production of prostaglandins by the pseudopregnant rat uterus, in vitro, and the effect of tamoxifen with the identification of 6-keto-prostaglandin F1alpha as a major product.
abstract: 1 Prostaglandin production by rat uterus homogenates has been studied, in vitro, on days 2 to 13 of pseudopregnancy. 2 The highest production of prostaglandins occurred on day 5. 3 The amounts of prostaglandins F and D formed were higher than the amounts of prostaglandin E on every day studied. 4 The ratios of prostglandins F and D to prostaglandin E produced steadily decreased up to day 6. It then increased with the highest values occurring between days 10 and 13, 5 Progesterone levels in peripheral plasma increased rapidly from days 2 to 5, remained high up to day 9, then steadily decreased between days 10 and 13. 6 The anti-oestrogenic drug, tamoxifen administered on day 2, significantly inhibited the increase of prostaglandin production which occurred on day 5. Prostaglandin E production was inhibited more than the production of prostaglandins F and D. 7 Analysis of the uterine extracts by gas chromatography and mass spectrometry showed prostaglandin F2alpha, F1alpha (in trace amounts), E2 and D2 to be present. 8 The major product detected was 6-keto-prostaglandin F1alpha. Its identification forms an addendum to the paper. 9 Also present as a major product was 6(9)-oxy-11,15-dihydroxyprosta-7,13-dienoic acid.
mesh_terms: D000818:Animals; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D066298:In Vitro Techniques; D007700:Kinetics; D011374:Progesterone / Q000378:metabolism; D011453:Prostaglandins / Q000096:biosynthesis*; D011460:Prostaglandins F / Q000096:biosynthesis*; D011555:Pseudopregnancy / Q000187:drug effects; D051381:Rats; D013267:Stilbenes / Q000494:pharmacology*; D013629:Tamoxifen / Q000494:pharmacology*; D013997:Time Factors; D014599:Uterus / Q000187:drug effects / Q000378:metabolism*
chemical_list: D011453:Prostaglandins; D011460:Prostaglandins F; D013267:Stilbenes; D013629:Tamoxifen; D011374:Progesterone