Progesterone membrane receptor component 1 expression in the immature rat ovary and its role in mediating progesterone's antiapoptotic action

Endocrinology
John J PelusoMartin Wehling

Abstract

Progesterone receptor membrane component-1 (PGRMC1) interacts with plasminogen activator inhibitor RNA binding protein-1 (PAIRBP1), a membrane-associated protein involved in the antiapoptotic action of progesterone (P4). In this paper, the first studies were designed to assess the ovarian expression pattern of PGRMC1 and PAIRBP1. Western blot analysis revealed that spontaneously immortalized granulosa cells (SIGCs) as well as granulosa and luteal cells express both proteins. Luteal cells were shown to express more PGRMC1 than granulosa cells. Immunohistochemical studies confirmed this and demonstrated that PGRMC1 was present in thecal/stromal cells, ovarian surface epithelial cells, and oocytes. PAIRBP1 was also expressed in thecal/stromal cells and ovarian surface epithelial cells but not oocytes. Furthermore, PAIRBP1 and PGRMC1 were detected among the biotinylated surface proteins that were isolated by avidin affinity purification, indicating that they localized to the extracellular surface of the plasma membrane. Confocal microscopy revealed that both of these proteins colocalize to the plasma membrane as well as the cytoplasm. The second studies were designed to assess PGRMC1's role in P4's antiapoptotic actions. These stud...Continue Reading

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