Abstract
Studies were undertaken to evaluate the effects of cysteamine on serum and anterior pituitary concentrations of prolactin in hyperprolactinemic female rats. Serum prolactin was elevated in young (4 to 5 months old) rats by implantation of 17 beta-estradiol while 26- to 28-month-old rats were in constant estrus and exhibited an age-related hyperprolactinemia. At 4 h after treatment with cysteamine (90 mg/kg body wt) serum and anterior pituitary prolactin concentrations were reduced in young animals by 98 and 85%, respectively. In old constant-estrous rats, cysteamine reduced serum prolactin by 92% and anterior pituitary prolactin by 82%. In young pseudopregnant rats, cysteamine induced a prompt resumption of estrous cycles. These studies indicate that cysteamine is an effective depletor of serum and pituitary prolactin in hyperprolactinemic rats.
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