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Endocrinology, Vol 136, 1537-1543, Copyright © 1995 by Endocrine Society

ARTICLES

Does the rat corpus luteum express the progesterone receptor gene?

OK Park-Sarge, TG Parmer, Y Gu and G Gibori
Department of Physiology, University of Kentucky, Lexington 40536.

To determine whether the progesterone receptor (PR) gene is expressed in rat corpora lutea (CL), PR messenger RNA (mRNA) and protein levels were examined in CL of both cycling and pregnant rats using in situ hybridization, reverse transcription-polymerase chain reaction, and Western blotting analyses. During the estrous cycle, levels of luteal PR mRNA were below the sensitivity of in situ hybridization. Although no signal could be detected in luteal cells, granulosa cells of preovulatory follicles of the same ovary expressed PR mRNA at high levels during the evening of proestrus. Likewise, CL of pregnant rats expressed undetectable levels of PR mRNA, which remained unchanged throughout pregnancy, as determined by in situ hybridization and reverse transcription-polymerase chain reaction. In addition, no PR protein could be detected in rat CL by Western analysis, indicating that luteal expression of the PR gene, if any, is negligible. To determine whether the lack of PR mRNA in the rat CL is due to progesterone-induced down-regulation of PR mRNA or to low levels of estrogen, aminoglutethimide was used to block the synthesis of progesterone in the presence and absence of exogenous estrogen, and PR mRNA levels were examined in the CL as well as the placenta. Inhibition of progesterone synthesis did increase PR mRNA levels in the placenta, and additional estrogen treatment further increased PR mRNA levels in this tissue. In contrast, neither aminoglutethimide alone nor aminoglutethimide plus estrogen induced PR mRNA expression in CL of the same rats. The temperature-sensitive luteal cell line derived from the rat CL, which produces very low levels of progesterone, also did not express PR mRNA. These results indicate that the rat corpus luteum expresses undetectable levels of PR mRNA and protein, which is not attributable to progesterone-induced down-regulation of PR mRNA or to a lack of estrogen-induced up-regulation of PR mRNA in this tissue.


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