title: 9-Hydroxyprostaglandin dehydrogenase in rat kidney cortex converts prostaglandin I2 into 15-keto-13,14-dihydro 6-ketoprostaglandin E1.
abstract: 15-Keto-13,14-dihydro 6-ketoprostaglandin E1 was positively identified by gas chromatography-mass spectrometry with negative-ion chemical ionisation detection from samples of rat kidney high-speed supernatant incubated with prostaglandin I2 in the presence of NAD+. A decreased formation of this product was observed when NAD+ was substituted with NADP+ and none was observed in the absence of nucleotide or substrate prostaglandin I2. Experiments with [9 beta-3H]prostaglandin I2 showed a time- and concentration-dependent loss of tritium which appeared as tritiated water, typical of reaction of [9 beta-3H]prostaglandin substrates with the enzyme, 9-hydroxyprostaglandin dehydrogenase. Time-course measurements of the appearance of tritiated water showed similar rates with 6-keto[9 beta-3H]prostaglandin F1 alpha and 15-keto-13,14-dihydro 6-keto[9 beta-3H]prostaglandin F1 alpha as substrates. These experiments suggest that the transformation of prostaglandin I2 and 6-ketoprostaglandin F1 alpha into the 15-keto-13,14-dihydro 6-ketoprostaglandin E1 catabolite occurs in this in vitro preparation via the corresponding 15-keto-13,14-dihydro catabolite of 6-ketoprostaglandin F1 alpha.
mesh_terms: D000527:Alprostadil / Q000031:analogs & derivatives*; D000818:Animals; D011464:Epoprostenol / Q000378:metabolism*; D008401:Gas Chromatography-Mass Spectrometry; D006911:Hydroxyprostaglandin Dehydrogenases / Q000378:metabolism*; D007672:Kidney Cortex / Q000201:enzymology*; D007700:Kinetics; D008297:Male; D011453:Prostaglandins / Q000032:analysis; D011458:Prostaglandins E / Q000096:biosynthesis*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: C043488:15-keto-13,14-dihydro-6-ketoprostaglandin E1; D011453:Prostaglandins; D011458:Prostaglandins E; D011464:Epoprostenol; D006911:Hydroxyprostaglandin Dehydrogenases; C035858:prostaglandin-E2 9-reductase; D000527:Alprostadil