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The primary site of action of estrogens and androgens in the regulation of hepatic prolactin receptors


, : The primary site of action of estrogens and androgens in the regulation of hepatic prolactin receptors. Endocrinology 111(2): 645-649

The primary sites of action of estrogens and androgens in the regulation of hepatic PRL receptors in the rat were identified. Implantation of estradiol benzoate in the pituitary region of male rats caused a feminization (i.e. an increase) of PRL receptors to a concentration typical of that found in female rats. Estrogen implanted in the paraventricular region of male rats was less effective in causing such a feminization. S.c. implantation of estrogen did not affect the PRL receptor concentration. Estrogen apparently induces PRL receptors via an action at the hypothalamo-pituitary level, possibly directly on the pituitary. The PRL receptor-suppressive action of s.c. injected testosterone was also excreted by the synthetic androgen R1881 (17.beta.-hydroxy-17.alpha.-methylestra-4,9,11-trien-3-one, methyltrienolone). Anterior hypothalamic deafferentation rendered both male and female rats insensitive to this action of R1881. An intact hypothalamo-pituitary unit is required for the PRL receptor-suppressive action of R1881. It is possible that the site of action of androgens is in the rostral hypothalamus or in adjacent areas of the brain.

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