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1 September 2000 Modulation of the Action of Chorionic Gonadotropin in the Baboon (Papio anubis) Uterus by a Progesterone Receptor Antagonist (ZK 137.316)
Stephanie Banaszak, Allison Brudney, Kathleen Donnelly, Daniel Chai, Kristof Chwalisz, Asgerally T. Fazleabas
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Abstract

Signals from the developing mammalian blastocyst rescue the corpus luteum (CL) and modulate the uterine environment in preparation for implantation and early pregnancy. Our previous studies demonstrated that both short- and long-term administration of chorionic gonadotropin (CG) markedly alters the morphology and the biochemical activity of the receptive endometrium. Because the effects of CG were superimposed on a progesterone-primed endometrium, this study was undertaken to determine if the inhibition of progesterone action by progesterone receptor antagonists (PRa) in intact and ovariectomized baboons would alter the action of CG on the endometrium at the time of uterine receptivity. In the short-term hCG-treated baboons, the PRa reduced the epithelial plaque reaction, completely inhibited α-smooth muscle actin (αSMA) expression in stromal fibroblasts, and induced the reappearance of the progesterone (PR) and estrogen (ERα) receptors in epithelial cells. However, this treatment protocol had no effect on the expression of glycodelin in the glandular epithelium. In contrast, glycodelin expression in addition to αSMA was suppressed in the ovariectomized animals. In the long-term hCG-treated baboons, the PRa had a similar effect on both αSMA, PR, and ER. In addition, this treatment also resulted in an inhibition of glycodelin expression in the glandular epithelium. These results indicate that blocking the action of progesterone on the endometrium even for a short period of time has a profound effect on the hCG-induced response in stromal fibroblasts. In contrast, for the diminution of glandular epithelial function in the presence of an ovary requires prolonged inhibition of progesterone action, suggesting a potential paracrine effect on the endometrium from the CL in response to hCG.

Stephanie Banaszak, Allison Brudney, Kathleen Donnelly, Daniel Chai, Kristof Chwalisz, and Asgerally T. Fazleabas "Modulation of the Action of Chorionic Gonadotropin in the Baboon (Papio anubis) Uterus by a Progesterone Receptor Antagonist (ZK 137.316)," Biology of Reproduction 63(3), 820-825, (1 September 2000). https://doi.org/10.1095/biolreprod63.3.820
Received: 17 February 2000; Accepted: 1 April 2000; Published: 1 September 2000
JOURNAL ARTICLE
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KEYWORDS
estradiol
estradiol receptor
hCG
implantation/early development
progesterone
uterus
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