Expression of Progesterone Receptor Membrane Component 1, Serpine mRNA Binding Protein 1 and Nuclear Progesterone Receptor Isoforms A and B in the Bovine Myometrium During the Estrous Cycle and Early Pregnancy

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The aim of this study was to investigate the (1) expression of progesterone membrane component 1 (PGRMC1), serpine mRNA binding protein 1 (SERBP1) and progesterone receptor (PR) mRNA and (2) protein expression levels of PGRMC1, SERBP1 and PR isoforms A and B in the bovine myometrium during the estrous cycle and early pregnancy. Uteri from cows on days 1-5, 6-10, 11-16 and 17-21 of the estrous cycle and weeks 3-5, 6-8 and 9-12 of pregnancy were used (n=5-6 per period). There were no changes (P›0.05) in PGRMC1 mRNA expression during the estrous cycle, while expression of SERBP1 and PR mRNA was the lowest (P%lsaquo;0.05) on days 11-16 relative to other days of the cycle. The highest mRNA expression of PGRMC1, SERBP1 and PR was found during pregnancy. There were no changes (P›0.05) in SERBP1 protein expression in cycling and pregnant cows, while the highest (P‹0.05) PGRMC1 protein expression was found during weeks 3-5 of pregnancy. Similar protein expression profiles for PRA and PRB were found, and protein levels were highest on days 1-5 of the estrous cycle. From day 6 of the cycle, PRA and PRB protein expression decreased and were maintained at this lower level during pregnancy. In conclusion, our study assessed mRNA and protein expression levels of PGRMC1, SERBP1 and PR in the bovine myometrium during the estrous cycle and the first trimester of pregnancy. It is possible that progesterone (P4) affects myometrial function in a genomic and nongenomic manner.
2012-06-01

Expression of Progesterone Receptor Membrane Component 1, Serpine mRNA Binding Protein 1 and Nuclear Progesterone Receptor Isoforms A and B in the Bovine Myometrium During the Estrous Cycle and Early Pregnancy

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