THE INDUCTION OF CYCLIC UTERINE BLEEDING IN NORMAL AND SPAYED RHESUS MONKEYS BY PROGESTERONE

Author:

KROHN P. L.

Abstract

SUMMARY Short periods of treatment with progesterone precipitate uterine bleeding in a spayed monkey which is receiving constant daily doses of oestrogen. The amount of progesterone required is proportional to the dose of oestrogen given. Treatment with progesterone (5 mg daily for 5 days) also precipitates uterine bleeding in untreated spayed monkeys at regular intervals of about 8 days. The first course of injections must be started immediately a menstrual bleeding has been induced, either by the surgical removal of the ovaries or by the withdrawal of an adequate oestrogenic stimulus. Treatment is usually ineffective if it is delayed for as little as 6 days. The number of cycles obtained in spayed animals, pretreated with oestrogen, seems to be related to the size of the initial dose of oestrogen used to induce withdrawal bleeding. Such cycles can be obtained not only after an oestrogen-withdrawal bleeding but also after a progesterone-withdrawal bleeding has occurred in monkeys which have neither received oestrogen nor menstruated for several months before treatment with progesterone was begun. Conditioning of the subsequent responses of the uterus for many months to come depends, therefore, on the occurrence of a single menstrual bleeding but not on the particular hormone used to obtain the bleeding. These effects of progesterone in spayed monkeys cannot be simulated by injections of deoxycorticosterone acetate (DCA). The intermenstrual bleeding that can be induced in normal female rhesus monkeys by injecting 5 mg progesterone daily for 5 days does not occur if the injections are continued at a constant lower threshold dose, which varies for different monkeys between 0·25 and 1·0 mg daily.

Publisher

Bioscientifica

Subject

Endocrinology,Endocrinology, Diabetes and Metabolism

Cited by 8 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

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2. Pharmakologie;Naunyn-Schmiedebergs Archiv für Experimentelle Pathologie und Pharmakologie;1961-03

3. A Review of the Endocrine Induction of Human Ovulation;Fertility and Sterility;1961-03

4. The effect of estrone and progesterone on the growth of experimental endometriosis in rhesus monkeys;American Journal of Obstetrics and Gynecology;1957-10

5. Progesterone in Anovulatory Uterine Bleeding;Fertility and Sterility;1957-03

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