NR5A2 and potential regulatory miRNAs in the bovine CL during early pregnancy

in Reproduction
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C H K Hughes Center for Reproductive Biology & Health, Department of Animal Science, Pennsylvania State University, University Park, Pennsylvania, USA

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A Rogus Center for Reproductive Biology & Health, Department of Animal Science, Pennsylvania State University, University Park, Pennsylvania, USA

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E K Inskeep Division of Animal & Nutritional Sciences, West Virginia University, Morgantown, West Virginia, USA

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J L Pate Center for Reproductive Biology & Health, Department of Animal Science, Pennsylvania State University, University Park, Pennsylvania, USA

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Correspondence should be addressed to J L Pate; Email: jlp36@psu.edu

(C H K Hughes is now at Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada)

(A Rogus is now at College of Veterinary Medicine, Cornell University, Ithaca, NY, USA)

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Progesterone, which is secreted from the corpus luteum, is indispensable for the establishment and maintenance of pregnancy. The orphan nuclear receptor subfamily 5 group A member 2 (NR5A2) is a regulator of murine luteinization, but neither its regulation nor its role in the fully differentiated, mature corpus luteum (CL) have been described. Therefore, the goal of this study was to profile abundance and investigate the regulation and functions of NR5A2 in the bovine CL. Treatment of cultured luteal steroidogenic cells with a pharmacological inhibitor of NR5A2 decreased progesterone production and tended to decrease abundance of HSD3B1 mRNA. Luteal NR5A2 mRNA increased and NR5A2 protein tended to increase between days 4 and 6 of the estrous cycle, coincident with increased steroidogenic capacity of the CL. Luteal NR5A2 mRNA decreased by 8 h after prostaglandin (PG) F2A injection. During early pregnancy, luteal NR5A2 mRNA was less on days 20 and 23 compared to day 14, but protein abundance did not change. Neither 1 nor 10 ng/mL interferon tau (IFNT) altered NR5A2 abundance in cultured luteal steroidogenic cells, but 10 ng/mL PGF2A decreased NR5A2. Because of discrepancies between mRNA and protein abundance of NR5A2, regulation by miRNA that changed during early pregnancy was investigated. miR-27b-3p, miR-432-5p, and miR-369-3p mimics decreased NR5A2 protein abundance and miR-369-3p also inhibited progesterone production. Overall, the results of this study show that NR5A2 may be maintained by miRNA during early pregnancy and may be an important regulator of luteal progesterone production.

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