Abstract
The steroid hormones act by binding to their receptors and subsequently interacting with coactivators. Several classes of coactivators have been identified and shown to be essential in estradiol (E2) responsiveness. The major coregulators are the p160 steroid receptor coactivator (SRC) family. Although the function of SRCs in other organs has been well studied, it has not been thoroughly studied in the placenta. In addition, the correlation between preeclampsia (PE) and SRCs has not been examined previously. Therefore, we compared the expression patterns of SRCs in normal and PE placentas. In human PE placental tissues, SRC-1 mRNA, and protein levels were downregulated in the PE group. In addition, to assess the expression of SRCs in a PE environment, we used Reduced Uterine Perfusion Pressure (RUPP) model and placental cells were cultured in hypoxia condition. SRC-1 proteins were reduced in the placenta of PE-like rat RUPP model. Furthermore, SRCs proteins were significantly downregulated in hypoxia-grown placental cells. To examine the interaction between estrogen receptors (ERs) and SRC-1 protein, we performed co-immunoprecipitation. The interaction of SRC-1 with ERα was significantly stronger than that with ERβ. In PE placenta, the interaction of both ERα and ERβ with SRC-1 was stronger than that in normal placenta. In summary, our results demonstrate that expression levels of SRC-1, not SRC-2 and SRC-3, were decreased in hypoxia-induced PE placenta, which may further reduce the signaling of sex steroid hormones such as E2. The dysregulated signaling of E2 by SRC-1 expression could be associated with the PE placental symptoms of patients.
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Acknowledgments
This study was supported by Research institute for Convergence of biomedical science and technology (30-2016-014), Pusan National University Yangsan Hospital. The biospecimens and data used for this study were provided by the Biobank of Pusan National University Hospital, a member of the Korea Biobank Network.
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Jeong, J.S., Lee, D.H., Lee, JE. et al. The Expression and Contribution of SRCs with Preeclampsia Placenta. Reprod. Sci. 27, 1513–1521 (2020). https://doi.org/10.1007/s43032-020-00142-5
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DOI: https://doi.org/10.1007/s43032-020-00142-5