Identification of 5α-Androstane-3α, 17β-diol as a Principal Metabolite of Pregnenolone in Rat Ovary at Onset of Puberty

THE mechanism which initiates puberty in the female mammal is not yet understood. Donovan and van der Werff ten Bosch1 have suggested that gonadal steroids inhibit gonadotrophin secretion in

both young and adult animals and that this inhibition is mediated by the brain. Because the amount of steroid required to inhibit gonadotrophin secretion was lower in young than in adult

animals, it was assumed that the neural receptors of immature individuals are more sensitive to the negative feedback action of gonadal steroids. A fundamental step towards sexual maturity

would therefore be a reduction in the sensitivity of the hypothalamus to gonadal hormones. This hypothesis implies that the gonads are capable of adult activity before puberty, an assumption

which has yet to be proved.

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