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Membrane Progesterone Receptors in the Porcine Uterine Endometrium
Minjeong Kim,Inkyu Yoo,Jisoo Han,Hwanhee Jang,Hakhyun Ka 한국수정란이식학회 2016 한국수정란이식학회 학술대회 Vol.2016 No.10
Progesterone regulates endometrial functions to support implantation, placentation, and fetal/placental development in the uterus. It is known that actions of progesterone are mediated by nuclear progesterone receptor (PGR), using the signaling pathway referred to the genomic pathway. However, all physiological progesterone actions cannot be explained by the genomic pathway via PGR, and it is understood that there are non-genomic actions of progesterone though membrane progesterone receptors, progesterone receptor membrane components (PGRMCs) and progestin and adipoQ receptors (PAQRs). The expression and localization of PGRMCs and PAQRs has been reported in female reproductive tissues of several species such as human, mouse and cattle. Previously, we have shown that PGRMCs and PAQRs are expressed in the porcine uterine endometrium during the estrous cycle and pregnancy. However, the regulatory mechanism for expression of PGRMCs and PAQRs in the uterine endometrium has not been studied in pigs. Thus, to understand the regulatory mechanism of PGRMC1, PGRMC2, PAQR5, PAQR6, PAQR7, PAQR8, and PAQR9 expression in the uterine endometrium during the estrous cycle and pregnancy in pigs, we determined the effect of steroid hormones estrogen and progesterone on expression of PGRMCs and PAQRs using the endometrial tissue explants for immature pigs. Levels of PGRMC1, PGRMC2, PAQR5, PAQR6, PAQR7, PAQR8, and PAQR9 mRNAs were increased by increasing doses of progesterone, but not by estradiol in the uterine endometrium. Blocking PGR by treatment of RU486, a progesterone receptor antagonist, increased levels of endometrial PGRMCs and PAQRs mRNA. These data showed that membrane progesterone receptors were induced by progesterone in the uterine endometrium, suggesting that these membrane progesterone receptors may play an important role in mediating progesterone actions in the uterine endometrium for regulation of the estrous cyclicity and pregnancy. [Supported by the Next Generation Biogreen 21 Program (# PJ01119103), Rural Development Administration, Republic of Korea]
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