Title

Estrogen interconversions in the induced cycle in female rhesus monkeys

UMMS Affiliation

Department of Obstetrics & Gynecology; Department of Physiology

Publication Date

5-1-1989

Document Type

Article

Subjects

17-Hydroxysteroid Dehydrogenases; Animals; Estradiol; Estrogens; Estrone; Female; Macaca mulatta; *Menstrual Cycle; Ovariectomy; Progesterone; Uterus

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

To determine the extractions and interconversions of estrone and estradiol across and within the uterus, [3H]estradiol and [14C]estrone were infused at a constant rate in six ovariectomized female rhesus (Macaca mulatta) monkeys. Studies were done on Days 9, 14, and 23 of artificial menstrual cycles induced by the timed insertion and removal of Silastic capsules of estradiol and progesterone. Measurements of estrogen radioactivity were made from peripheral arterial blood and uterine venous blood as well as from endometrial biopsy samples. A significant increase occurred in the conversion of estradiol to estrone measured within the uterus on Day 23 compared to Days 9 and 14. The conversion of estrone to estradiol, measured within the uterus, fell progressively from Day 9 to Day 23, but this decrease was not significant. The extractions and interconversions across the uterus, and the overall interconversions of estrone and estradiol were not significantly different on Days 9, 14, or 23 of the cycle. Thus, we have been able to confirm in vivo the increase in the activity of the 17 beta-hydroxysteroid dehydrogenase, the enzyme responsible for estradiol to estrone interconversions, shown earlier by studies done in vitro. However, the increase in 17 beta-hydroxysteroid activity in the uterus is not reflected in the overall interconversions of estrone and estradiol as reflected by measurements in peripheral arterial blood.

Rights and Permissions

Citation: Biol Reprod. 1989 May;40(5):949-52.

Related Resources

Link to article in PubMed

Journal/Book/Conference Title

Biology of reproduction

PubMed ID

2548632