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Newborn female Albino Swiss rats received testosterone propionate, dihydrotestosterone benzoate or oestradiol benzoate for 4 days after birth. The neonatal administration of all three hormones maintained neurones of the spinal nucleus of bulbocavernosus (SNB) complex in adulthood at levels intermediate between those found in normal females (approximately 40 neurones) and those found in normal males (approximately 220 neurones). Dihydrotestosterone benzoate was the most effective treatment. Oestradiol benzoate, while as potent as testosterone propionate in maintaining SNB neurone numbers, could not maintain the perineal muscles which are their normal target. Dihydrotestosterone benzoate and testosterone propionate maintained both neurones and muscles. Newborn male Albino Swiss rats received either the aromatase inhibitor 4-OH-androstenedione, or the 5 alpha-reductase inhibitor aza-steroid 17 beta-N,N-diethylcarbamoyl-4-methyl-4-aza-5 alpha-androstan-3-one(4-MA). Only neonatal treatment with 4-MA led to reduced SNB neurone numbers in adulthood, but the reduction was modest (-16%). The results of the two experiments suggest that several hormones can maintain SNB neurone numbers in Albino Swiss rats, but that 5 alpha-reduced metabolites of testosterone may be particularly effective.

Neonatal hormone manipulations and the maintenance of perineal muscles and their motor neurones in Albino Swiss rats