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• W2594759795 abstract "// Raghuveer Kavarthapu 1 , Maria L. Dufau 1 1 Section on Molecular Endocrinology, Eunice Kennedy Schriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-4510, USA Correspondence to: Maria L. Dufau, email: dufaum@mail.nih.gov Keywords: estrogen receptor, prolactin, prolactin receptor, estradiol, STAT5 Received: November 17, 2016      Accepted: February 18, 2017      Published: March 09, 2017 ABSTRACT Our early studies have shown that Estradiol (E 2 )/Estrogen Receptor α (ER) in a non-DNA dependent manner through complex formation with C/EBPβ/SP1 induced transcriptional activation of the generic hPIII promoter and expression of the Prolactin Receptor (PRLR) receptor in MCF-7 cells. Subsequent studies demonstrated effects of unliganded ERα with requisite participation of endogenous PRL on the activation of PRLR transcription. Also, EGF/ERBB1 in the absence of PRL and E 2 effectively induced upregulation of the PRLR. In this study we have delineated the transcriptional mechanism of upregulation of PRLR receptor induced by E 2 incorporating knowledge of the various transcriptional upregulation modalities from our previous studies. Here, we demonstrate an essential requirement of STAT5a induced by PRL via PRLR receptor which associates at the promoter and its interaction with phoshoERα S118. Knock-down of PRL by siRNA significantly reduced E 2 -induced PRLR promoter activity, mRNA and protein expression, recruitment of ERα to the complex at promoter, C/EBPβ association to its DNA site and productive complex formation at hPIII promoter. The specific CDK7 inhibitor (THZ1) that attenuates E 2 -induced ERα phosphorylation at S118 abrogated E 2 -induced PRLR promoter activation. Further studies demonstrated that E 2 induced cell migration was inhibited by PRL siRNA and THZ1 indicating its dependence on PRL/PRLR and CDK7, respectively. Our studies have demonstrated the essential role of endogenous PRL and CDK7 in the upregulation of PRLR by E 2 and provide insights for therapeutic approaches that will mitigate the transcription/expression of PRLR and its participation in breast cancer progression fueled by E 2 and PRL via their cognate receptors." @default.
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• W2594759795 date "2017-03-09" @default.
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• W2594759795 title "Essential role of endogenous prolactin and CDK7 in estrogen-induced upregulation of the prolactin receptor in breast cancer cells" @default.
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• W2594759795 doi "https://doi.org/10.18632/oncotarget.16040" @default.
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