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Meinsohn MC, Smith OE, Bertolin K, Murphy BD. The Orphan Nuclear Receptors Steroidogenic Factor-1 and Liver Receptor Homolog-1: Structure, Regulation, and Essential Roles in Mammalian Reproduction. Physiol Rev 2019; 99:1249-1279. [DOI: 10.1152/physrev.00019.2018] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Nuclear receptors are intracellular proteins that act as transcription factors. Proteins with classic nuclear receptor domain structure lacking identified signaling ligands are designated orphan nuclear receptors. Two of these, steroidogenic factor-1 (NR5A1, also known as SF-1) and liver receptor homolog-1 (NR5A2, also known as LRH-1), bind to the same DNA sequences, with different and nonoverlapping effects on targets. Endogenous regulation of both is achieved predominantly by cofactor interactions. SF-1 is expressed primarily in steroidogenic tissues, LRH-1 in tissues of endodermal origin and the gonads. Both receptors modulate cholesterol homeostasis, steroidogenesis, tissue-specific cell proliferation, and stem cell pluripotency. LRH-1 is essential for development beyond gastrulation and SF-1 for genesis of the adrenal, sexual differentiation, and Leydig cell function. Ovary-specific depletion of SF-1 disrupts follicle development, while LRH-1 depletion prevents ovulation, cumulus expansion, and luteinization. Uterine depletion of LRH-1 compromises decidualization and pregnancy. In humans, SF-1 is present in endometriotic tissue, where it regulates estrogen synthesis. SF-1 is underexpressed in ovarian cancer cells and overexpressed in Leydig cell tumors. In breast cancer cells, proliferation, migration and invasion, and chemotherapy resistance are regulated by LRH-1. In conclusion, the NR5A orphan nuclear receptors are nonredundant factors that are crucial regulators of a panoply of biological processes, across multiple reproductive tissues.
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Affiliation(s)
- Marie-Charlotte Meinsohn
- Centre de Recherche en Reproduction et Fertilité, Université de Montréal, St-Hyacinthe, Québec, Canada
| | - Olivia E. Smith
- Centre de Recherche en Reproduction et Fertilité, Université de Montréal, St-Hyacinthe, Québec, Canada
| | - Kalyne Bertolin
- Centre de Recherche en Reproduction et Fertilité, Université de Montréal, St-Hyacinthe, Québec, Canada
| | - Bruce D. Murphy
- Centre de Recherche en Reproduction et Fertilité, Université de Montréal, St-Hyacinthe, Québec, Canada
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Cystathionine beta synthase-hydrogen sulfide system in paraventricular nucleus reduced high fatty diet induced obesity and insulin resistance by brain-adipose axis. Biochim Biophys Acta Mol Basis Dis 2018; 1864:3281-3291. [DOI: 10.1016/j.bbadis.2018.07.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 07/10/2018] [Accepted: 07/11/2018] [Indexed: 12/28/2022]
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Natarajan K, Xie Y, Nakanishi T, Moreci RS, Jeyasuria P, Hussain A, Ross DD. Methods to Discover Alternative Promoter Usage and Transcriptional Regulation of Murine Bcrp1. J Vis Exp 2016. [PMID: 27286290 DOI: 10.3791/53827] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Gene expression in different tissues is often controlled by alternative promoters that result in the synthesis of mRNA with unique - usually untranslated - first exons. Bcrp1 (Abcg2), the murine orthologue of the ABC transporter Breast Cancer Resistance Protein (BCRP, ABCG2), has at least four alternative promoters that are designated by the corresponding four alternative first exons produced: E1U, E1A, E1B, and E1C. Herein, in-silico protocols are presented to predict alternative promoter usage for Bcrp1. Furthermore, reporter assay methods are described to produce reporter constructs for alternative promoters and to determine the functionality of putative promoters upstream of the alternative first exons that are identified.
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Affiliation(s)
- Karthika Natarajan
- Greenebaum Cancer Center, University of Maryland School of Medicine; Pharmaceutical Sciences, University of Maryland School of Pharmacy
| | - Yi Xie
- Greenebaum Cancer Center, University of Maryland School of Medicine; Baltimore VA Medical Center
| | - Takeo Nakanishi
- Membrane Transport and Biopharmaceutics, School of Pharmaceutical Sciences, Kanazawa University
| | - Rebecca S Moreci
- Obstetrics, Gynecology and Reproductive Science, University of Pittsburgh; Magee Women's Research Institute
| | - Pancharatnam Jeyasuria
- Obstetrics, Gynecology, Perinatal Research Branch (NICHD), Wayne State University School of Medicine
| | - Arif Hussain
- Greenebaum Cancer Center, University of Maryland School of Medicine; Baltimore VA Medical Center; Medicine, University of Maryland School of Medicine; Pathology, University of Maryland School of Medicine
| | - Douglas D Ross
- Greenebaum Cancer Center, University of Maryland School of Medicine; Baltimore VA Medical Center; Medicine, University of Maryland School of Medicine; Pathology, University of Maryland School of Medicine; Pharmacology, University of Maryland School of Medicine; Experimental Therapeutics, University of Maryland School of Medicine;
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Xie Y, Nakanishi T, Natarajan K, Safren L, Hamburger AW, Hussain A, Ross DD. Functional cyclic AMP response element in the breast cancer resistance protein (BCRP/ABCG2) promoter modulates epidermal growth factor receptor pathway- or androgen withdrawal-mediated BCRP/ABCG2 transcription in human cancer cells. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2015; 1849:317-27. [PMID: 25615818 DOI: 10.1016/j.bbagrm.2015.01.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 12/19/2014] [Accepted: 01/13/2015] [Indexed: 10/24/2022]
Abstract
Phosphorylated cyclic-AMP (cAMP) response element binding protein (p-CREB) is a downstream effector of a variety of important signaling pathways. We investigated whether the human BCRP promoter contains a functional cAMP response element (CRE). 8Br-cAMP, a cAMP analogue, increased the activity of a BCRP promoter reporter construct and BCRP mRNA in human carcinoma cells. Epidermal growth factor receptor (EGFR) pathway activation also led to an increase in p-CREB and in BCRP promoter reporter activity via two major downstream EGFR signaling pathways: the phosphotidylinositol-3-kinase (PI3K)/AKT pathway and the mitogen-activated protein kinase (MAPK) pathway. EGF treatment increased the phosphorylation of EGFR, AKT, ERK and CREB, while simultaneously enhancing BCRP mRNA and functional protein expression. EGF-stimulated CREB phosphorylation and BCRP induction were diminished by inhibition of EGFR, PI3K/AKT or RAS/MAPK signaling. CREB silencing using RNA interference reduced basal levels of BCRP mRNA and diminished the induction of BCRP by EGF. Chromatin immunoprecipitation assays confirmed that a putative CRE site on the BCRP promoter bound p-CREB by a point mutation of the CRE site abolished EGF-induced stimulation of BCRP promoter reporter activity. Furthermore, the CREB co-activator, cAMP-regulated transcriptional co-activator (CRTC2), is involved in CREB-mediated BCRP transcription: androgen depletion of LNCaP human prostate cancer cells increased both CREB phosphorylation and CRTC2 nuclear translocation, and enhanced BCRP expression. Silencing CREB or CRTC2 reduced basal BCRP expression and BCRP induction under androgen-depletion conditions. This novel CRE site plays a central role in mediating BCRP gene expression in several human cancer cell lines following activation of multiple cancer-relevant signaling pathways.
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Affiliation(s)
- Yi Xie
- Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Takeo Nakanishi
- Department of Membrane Transport and Biopharmaceutics, School of Pharmaceutical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Karthika Natarajan
- Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Lowell Safren
- Schnaper Summer Internship Program, University of Maryland Greenebaum Cancer Center, USA
| | - Anne W Hamburger
- Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Pathology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Arif Hussain
- Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Pathology, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Baltimore VA Medical Center, Baltimore, MD 21201, USA
| | - Douglas D Ross
- Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Pathology, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Baltimore VA Medical Center, Baltimore, MD 21201, USA; Department of Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
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Natarajan K, Baer MR, Ross DD. Role of Breast Cancer Resistance Protein (BCRP, ABCG2) in Cancer Outcomes and Drug Resistance. RESISTANCE TO TARGETED ANTI-CANCER THERAPEUTICS 2015. [DOI: 10.1007/978-3-319-09801-2_3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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