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Regular Article |
Knockout Mouse1
a Departments of Anatomy and
b Urology, University of California, San Francisco, California 94143
c Department of Veterinary Biosciences, University of Illinois, Urbana, Illinois 61802
d MRC Reproductive Biology Unit, Edinburgh, EH3 9ET, United Kingdom
e Departments of Biochemistry and Child Health, University of Missouri, Columbia, Missouri 65211
f Department of Medical Nutrition and Biosciences, Karolinska Institute, NOVUM, S-141 86 Huddinge, Sweden
ABSTRACT
Regulation of progesterone receptor (PR) in uterine stroma (endometrial stroma plus myometrium) by estrogen was investigated in estrogen receptor-
(ER
) knockout (
ERKO) mice. 17ß-Estradiol (E2) increased PR levels in uterine stroma of ovariectomized
ERKO mice, and ICI 182 780 (ICI) inhibited this E2-induced PR expression. Estrogen receptor-ß (ERß) was detected in both uterine epithelium and stroma of wild-type and
ERKO mice by immunohistochemistry. In organ cultures of
ERKO uterus, both E2 and diethylstilbestrol induced stromal PR, and ICI inhibited this induction. These findings suggest that estrogen induces stromal PR via ERß in
ERKO uterus. However, this process is not mediated exclusively by ERß, because in ERß knockout mice, which express ER
, PR was up-regulated by E2 in uterine stroma. In both wild-type and
ERKO mice, progesterone and mechanical traumatization were essential and sufficient to induce decidual cells, even though E2 and ER
were also required for increase in uterine weight. Progesterone receptor was strongly expressed in decidual cells in
ERKO mice, and ICI did not inhibit decidualization or PR expression. This study suggests that up-regulation of PR in endometrial stroma is mediated through at least three mechanisms: 1) classical estrogen signaling through ER
, 2) estrogen signaling through ERß, and 3) as a result of mechanical stimulation plus progesterone, which induces stromal cells to differentiate into decidual cells. Each of these pathways can function independently of the others.
First decision: 22 March 2000.
1 Supported by National Institutes of Health grants AG-13784 and DK47517 to G.R.C., AG-15500 to P.S.C., R01-ES08272 to D.B.L., AG-16870 to R.D., and U.S. Army grant DAMD17-97-1-7171 to D.B.L.
2 Correspondence: Gerald R. Cunha, P.O. Box 0452, Department of Anatomy, University of California-San Francisco, San Francisco, CA 94143. FAX: 415 502 2270; gcunha{at}itsa.ucsf.edu
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