Abstract
Beta-lipotropin (beta-LPH) and beta-endorphin (beta-EP) plasma levels were characterized by a significant decrease in postmenopausal females (22 subjects aged from 56 to 70 yr) when compared to fertile women (22 subjects from 31 to 45 yr). On the contrary, ACTH plasma levels determined in 10 of the premenopausal and 13 of the postmenopausal subjects reported above showed constant levels in both groups. A significant increase in the beta-LPH/beta-EP molar ratio was observed in postmenopausal females. The plasma beta-LPH and beta-EP levels studied before and 6 months after ovariectomy, showed a significant decrease in 8 out of 10 patients, while they remained constant in the other 2. Two subjects, in whom postsurgical samples were taken during a flushing episode, showed beta-LPH and beta EP plasma levels which were both higher than the corresponding preovariectomy values. The results suggest that these changes may be important in explaining modifications in behavior and mood frequently found in postmenopausal females and in patients undergoing surgical castration in the fertile age.
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