Summary
Tritium-labelled 16,16-dimethyl-PGE2, 9-methylene-PGE2 (9-deoxo-16,16-dimethyl-9-methylene-prostaglandin E2) and tetranor-9-methylene-PGE2 were incubated with guinea pig liver microsomes. All three compounds were converted to ω-oxidized products in yields of a few per cent. In addition, from incubations with 9-methylene-PGE2 and tetranor-9-methylene-PGE2 were also obtained metabolites with the methylene group transformed into a dihydrodiol. In a comparative study with rat liver microsomes, it was found that these converted tetranor-9-methylene-PGE2 in a 50 per cent yield to ω-oxidized products. Finally, 20.000 × G supernatants from guinea pig and rat liver were compared with respect to ω-oxidation. The rat liver 20.000 × G supernatant was found to convert the substrate to the same extent as washed microsomes. By contrast, the guinea pig liver 20.000 × G supernatant was considerably more efficient than washed microsomes.
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Steffenrud, S. Metabolism of prostaglandin E analogs in guinea pig and rat liver microsomes. European Journal of Drug Metabolism and Pharmacokinetics 11, 39–50 (1986). https://doi.org/10.1007/BF03189774
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DOI: https://doi.org/10.1007/BF03189774