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Progestogen metabolism by ovaries of the roach (Rutilus rutilus L.) and the rudd (Scardinius erythrophthalmus L.)

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Abstract

Roach ovaries converted 17-hydroxyprogesterone to 17,20α-dihydroxy-4-pregnen-3-one (17,20αP) and to glucuronides of testosterone and 17,20αP. Small amounts of 5α-pregnane-3α- and -3β, 17, 20α-triols, 7α-hydroxy-5α-reduced metabolites and 17,20β-dihydroxy-4-pregnen-3-one (17,20βP) were also formed. Rudd ovaries converted this substrate mainly to 17,20αP, 5α-pregnane-3α- and -3β,17,20α-triols, 17,20α-dihydroxy-5α-pregnan-3-one and testosterone glucuronide. The main metabolites of progesterone with both species were 17,20αP, 5α-pregnane-3β,17,20α-triol and 7α-hydroxy-5α-reduced steroids. Rudd ovaries formed, in addition, 17,20α-dihydroxy-5α-pregnan-3-one from progesterone. The pattern of metabolites was markedly altered when the concentration of substrate was increased from 42ng to 1 µg or 100 µg. At the highest concentration, glucuronides and polar steroids were not detectable, while at low concentrations they accounted for over 50% of the metabolites. 20α-Hydroxysteroid dehydrogenase was shown to have a very high capacity, producing 21–47 µg 17,20αP from 100 µg 17-hydroxyprogesterone substrate with 200 mg ovarian tissue in 5h.

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  1. Department of Animal and Plant Sciences, The University, S10 2UQ, Sheffield, United Kingdom

    David E. Kime

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Kime, D.E. Progestogen metabolism by ovaries of the roach (Rutilus rutilus L.) and the rudd (Scardinius erythrophthalmus L.). Fish Physiol Biochem 9, 497–504 (1992). https://doi.org/10.1007/BF02274230

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  • DOI: https://doi.org/10.1007/BF02274230

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