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Biosynthesis of 3 beta-hydroxy-5,7-pregnadien-20-one by the horse fetal gonad.

The production of equilin and the other ring B-unsaturated estrogens by the pregnant mare is anomalous in that they are biosynthesised by a cholesterol-independent pathway. Fetal horse gonads were incubated with tritiated sodium acetate and radiochemically pure 3 beta-hydroxy-5,7-pregnadien-20-one and 3 beta-hydroxy-5,7-androstadien-17-one were isolated. A fetal gonad--placental system is proposed for equilin production, 3 beta-hydroxy-5,7-pregnadien-20-one being a precursor for 3 beta-hydroxy-5,7-androstadien-17-one in the fetal gonad and the latter being the precursor of equilin in the placenta. The nature of the possible precursor of 3 beta-hydroxy-5,7-pregnadien-20-one is discussed.[1]

References

  1. Biosynthesis of 3 beta-hydroxy-5,7-pregnadien-20-one by the horse fetal gonad. Tait, A.D., Hodge, L.C., Allen, W.R. FEBS Lett. (1983) [Pubmed]
 
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