Abstract
The use of valproic acid during human pregnancy increases the risk of hypospadias in the offspring. Rats exposed in utero to valproic acid did not develop hypospadias and even had a slightly increased anogenital distance in males 3-4 days after birth. A classical antiandrogenic drug, flutamide, caused hypospadias as well as a reduction of the anogenital distance in males. At the age of 3 months, rats exposed in utero with either valproic acid or flutamide showed a reduced testicular weight and hypoplasia of tubules, which seemed not to be related to the antiandrogenic activity of flutamide as it did not correlate with the presence of hypospadias. The mechanism through which valproic acid causes hypospadias in man and affects testicular development in rat is unknown. Hypospadias caused by valproic acid in man is apparently not due to anti-androgenic properties of the drug.
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More From: Basic & Clinical Pharmacology & Toxicology
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