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Post partum patterns of circulating follicle stimulating hormone luteinizing hormone prolactin estradiol and progesterone in nonsuckling cynomolgus monkeys


Steroids 31(5): 731-744
Post partum patterns of circulating follicle stimulating hormone luteinizing hormone prolactin estradiol and progesterone in nonsuckling cynomolgus monkeys
Circulating levels of FSH [follicle stimulating hormone], LH [luteinizing hormone], prolactin (Prl), estradiol (E) and progesterone (P) were determined in RIA [radioimmunoassay] in 4 intact and 4 monkeys luteectomized (CLX) at parturition in order to characterize the patterns of these hormones during the puerperium, and examine a possible inhibitory role of the rejuvenated corpus luteum (CL) on the resumption of follicle growth post partum. In both groups during the 1st 4 wk, FSH and LH were at tonic levels typical of ovulatory cycles. Recurrent puerperal surges of FSH, but not LH, unaccompanied by increments in serum E, were observed in both intact and CLX monkeys. No consistent pattern of serum Prl was apparent. CLX was followed by a prompt fall in serum P levels, which were elevated above typical follicular phase levels into the 2nd wk post partum in intact monkeys. Menstrual cycles resumed 2-4 mo. after delivery. Hormonal patterns during the 1st menstrual cycle post partum were indistinguishable from those observed in pregravidic ovulatory cycles. In nonsuckling cynomolgus monkeys although it secretes progesterone, the puerperal CL does not inhibit the resumption of the ovarian cycle post partum, the puerperal ovary is not absolutely refractory to gonadotropins, since initial trials with Pergonal + hCG [human chorionic gonadotropin] stimulated ovarian function, and ovarian activity during the puerperium may be limited by factors other than the tonic supply of gonadotropins.


Accession: 006153028



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