Abstract

The effects of short-term steroid treatment on the blood and pituitary LH and FSH levels of previously castrated adult male and female rats were examined, using ovarian ascorbic acid depletion (OAAD) and HCG-augmentation bioassays for LH and FSH activities. Pituitary and plasma FSH activities, 3 days after an injection of 1) testosterone propionate (TP) or 2) estradiol benzoate plus progesterone (E + P), were compared in 5 experiments. Concomitant changes in plasma and pituitary LH levels were studied in 3 of these experiments and 2 others. In 2 further studies in spayed rats, both stored and circulating LH and FSH were examined after 7 days of TP treatment. In addition, pituitary FSH and plasma LH were studied 24 hr after single injections of TP. Both steroid treatments (TP and E + P) decreased plasma LH levels without altering pituitary LH concentrations detectably. The TP effect on plasma LH was evident after only 24 hr. Thus, both treatments apparently reduced the rate of LH release. Because of the re...

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