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Bhakta-Yadav MS, Burra K, Alhamdan N, Allex-Buckner CP, Sulentic CEW. The aryl hydrocarbon receptor differentially modulates the expression profile of antibody isotypes in a human B-cell line. Toxicol Sci 2024; 199:276-288. [PMID: 38526216 DOI: 10.1093/toxsci/kfae035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/26/2024] Open
Abstract
2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is a persistent environmental contaminant and high affinity ligand for the aryl hydrocarbon receptor (AhR). In animal models, AhR activation by TCDD generally inhibits antibody secretion. However, it is less clear if this translates to human antibody production. Using a human Burkitt lymphoma B-cell line (CL-01) that can be stimulated to secrete Ig and undergo class switch recombination to other Ig isotypes, the current study evaluated the effects of AhR activation or antagonism on the human Ig isotypic expression profile with CD40L+IL-4 stimulation. Our results suggest that AhR agonists (TCDD and indirubin) have little to no effect on IgM or IgA secretion, which were also not induced with stimulation. However, AhR activation significantly inhibited stimulation-induced IgG secretion, an effect reversed by the AhR antagonist CH223191. Evaluation of Ig heavy chain (IgH) constant region gene expression (ie Cμ, Cγ1-4, Cα1-2, and Cε that encode for IgM, IgG1-4, IgA1-2, and IgE, respectively) demonstrated differential effects. While Cμ and Cα2 transcripts were unaffected by stimulation or AhR agonists, AhR activation significantly inhibited stimulation-induced Cγ2-4 and Cε mRNA transcripts, which was reversed by AhR antagonism. Notably, AhR antagonism in the absence of exogenous AhR ligands significantly increased IgG and IgA secretion as well as the expression of Cγ2-4 and Cε. These results suggest that modulation of AhR activity differentially alters the IgH isotypic expression profile and antibody secretion that may be partly dependent on cellular stimulation. Since a variety of chemicals from anthropogenic, industrial, pharmaceutical, dietary, and bacterial sources bind the AhR, the ability of environmental exposures to alter AhR activity (i.e. activate or inhibit) may have a direct influence on immune function and antibody-relevant disease conditions.
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Affiliation(s)
- Mili S Bhakta-Yadav
- Department of Pharmacology & Toxicology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio 45435, USA
| | - Kaulini Burra
- Department of Pharmacology & Toxicology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio 45435, USA
| | - Nasser Alhamdan
- Department of Pharmacology & Toxicology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio 45435, USA
| | - Clayton P Allex-Buckner
- Department of Pharmacology & Toxicology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio 45435, USA
| | - Courtney E W Sulentic
- Department of Pharmacology & Toxicology, Boonshoft School of Medicine, Wright State University, Dayton, Ohio 45435, USA
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2
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Chaudhry KA, Bianchi-Smiraglia A. The aryl hydrocarbon receptor as a tumor modulator: mechanisms to therapy. Front Oncol 2024; 14:1375905. [PMID: 38807762 PMCID: PMC11130384 DOI: 10.3389/fonc.2024.1375905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 05/03/2024] [Indexed: 05/30/2024] Open
Abstract
The aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor that is widely recognized to play important, but complex, modulatory roles in a variety of tumor types. In this review, we comprehensively summarize the increasingly controversial role of AhR as a tumor regulator and the mechanisms by which it alters tumor progression based on the cancer cell type. Finally, we discuss new and emerging strategies to therapeutically modulate AhR, focusing on novel agents that hold promise in current human clinical trials as well as existing FDA-approved drugs that could potentially be repurposed for cancer therapy.
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Affiliation(s)
| | - Anna Bianchi-Smiraglia
- Department of Cell Stress Biology, Roswell Park Comprehensive Cancer Center, Buffalo, New York, NY, United States
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3
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Stanic B, Sukur N, Milošević N, Markovic Filipovic J, Pogrmic-Majkic K, Andric N. Differential eigengene network analysis reveals benzo[a]pyrene and 2,3,7,8-tetrachlorodibenzo-p-dioxin consensus regulatory network in human liver cell line HepG2. Toxicology 2024; 502:153737. [PMID: 38311099 DOI: 10.1016/j.tox.2024.153737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 01/17/2024] [Accepted: 01/24/2024] [Indexed: 02/06/2024]
Abstract
Aryl hydrocarbon receptor (AHR) is one of the main mediators of the toxic effects of benzo[a]pyrene (BaP) and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). However, a vast number of BaP- and TCDD-affected genes may suggest a more complex transcriptional regulatory network driving common adverse effects of these two chemicals. Unlike TCDD, BaP is rapidly metabolized in the liver, yielding products with a questionable ability to bind and activate AHR. In this study, we used transcriptomics data from the BaP- and TCCD-exposed human liver cell line HepG2, and performed differential eigengene network analysis to understand the correlation among genes and to untangle the common regulatory mechanism in the action of BaP and TCDD. The genes were grouped into 11 meta-modules with an overall preservation of 0.72 and were also segregated into three consensus time clusters: 12, 24, and 48 h. The analysis showed that the consensus genes in each time cluster were either directly regulated by the AHR or the AHR-TF interactions. Some TFs form a direct physical interaction with AHR such as ESR1, FOXA1, and E2F1, whereas others, including CTCF, RXRA, FOXO1, CEBPA, CEBPB, and TP53 show an indirect interaction with AHR. The analysis of biological processes (BPs) identified unique and common BPs in BaP and TCDD samples, with DNA damage response detected in all three time points. In summary, we identified a consensus transcriptional regulatory network common for BaP and TCDD consisting of direct AHR targets and AHR-TF targets. This analysis sheds new light on the common mechanism of action of a genotoxic (BaP) and non-genotoxic (TCDD) chemical in liver cells.
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Affiliation(s)
- Bojana Stanic
- Department of Biology and Ecology, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 2, 21000 Novi Sad, Serbia
| | - Nataša Sukur
- Department of Mathematics and Informatics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 4, 21000 Novi Sad, Serbia
| | - Nemanja Milošević
- Department of Mathematics and Informatics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 4, 21000 Novi Sad, Serbia
| | - Jelena Markovic Filipovic
- Department of Biology and Ecology, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 2, 21000 Novi Sad, Serbia
| | - Kristina Pogrmic-Majkic
- Department of Biology and Ecology, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 2, 21000 Novi Sad, Serbia
| | - Nebojsa Andric
- Department of Biology and Ecology, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 2, 21000 Novi Sad, Serbia.
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4
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Jabłońska-Trypuć A, Wydro U, Wołejko E, Makuła M, Krętowski R, Naumowicz M, Sokołowska G, Serra-Majem L, Cechowska-Pasko M, Łozowicka B, Kaczyński P, Wiater J. Selected Fungicides as Potential EDC Estrogenic Micropollutants in the Environment. Molecules 2023; 28:7437. [PMID: 37959855 PMCID: PMC10648374 DOI: 10.3390/molecules28217437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 10/30/2023] [Accepted: 11/01/2023] [Indexed: 11/15/2023] Open
Abstract
An increasing level of pesticide exposition is being observed as a result of the consumption of large amounts of fruits, vegetables and grain products, which are key components of the vegetarian diet. Fungicides have been classified as endocrine-disrupting compounds, but their mechanisms of action have not yet been clarified. The effect of boscalid (B), cyprodinil (C) and iprodione (I) combined with Tamoxifen (T) and 17β-estradiol (E2) on cell viability, cell proliferation, reporter gene expression, ROS content, the cell membrane's function, cell morphology and antioxidant enzymes gene expression in MCF-7 and T47D-KBluc cell lines were investigated. The cell lines were chosen due to their response to 17β -estradiol. The selected fungicides are commonly used in Poland to protect crops against fungi. Our results revealed that the studied fungicides caused significant increases in cell viability and proliferation, and estrogenic activity was present in all studied compounds depending on their concentrations. Oxidative stress activated uncontrolled cancer cell proliferation by inducing ROS production and by inhibiting antioxidant defense. Our findings verify that the studied fungicides could possibly exhibit endocrine-disrupting properties and exposure should be avoided.
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Affiliation(s)
- Agata Jabłońska-Trypuć
- Department of Chemistry, Biology and Biotechnology, Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, Wiejska 45E Street, 15-351 Białystok, Poland; (U.W.); (E.W.); (G.S.)
| | - Urszula Wydro
- Department of Chemistry, Biology and Biotechnology, Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, Wiejska 45E Street, 15-351 Białystok, Poland; (U.W.); (E.W.); (G.S.)
| | - Elżbieta Wołejko
- Department of Chemistry, Biology and Biotechnology, Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, Wiejska 45E Street, 15-351 Białystok, Poland; (U.W.); (E.W.); (G.S.)
| | - Marcin Makuła
- Faculty of Medical Sciences in Zabrze, Medical University of Silesia, Traugutta sq.2, 41-800 Zabrze, Poland;
| | - Rafał Krętowski
- Department of Pharmaceutical Biochemistry, Medical University of Bialystok, Mickiewicza 2A Street, 15-222 Bialystok, Poland; (R.K.); (M.C.-P.)
| | - Monika Naumowicz
- Department of Physical Chemistry, Faculty of Chemistry, University of Bialystok, Ciolkowskiego 1K Street, 15-245 Bialystok, Poland;
| | - Gabriela Sokołowska
- Department of Chemistry, Biology and Biotechnology, Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, Wiejska 45E Street, 15-351 Białystok, Poland; (U.W.); (E.W.); (G.S.)
| | - Lluis Serra-Majem
- Research Institute of Biomedical and Health Sciences, University of Las Palmas de Gran Canaria, 35001 Las Palmas de Gran Canaria, Spain;
| | - Marzanna Cechowska-Pasko
- Department of Pharmaceutical Biochemistry, Medical University of Bialystok, Mickiewicza 2A Street, 15-222 Bialystok, Poland; (R.K.); (M.C.-P.)
| | - Bożena Łozowicka
- Institute of Plant Protection—National Research Institute, Chełmońskiego 22 Street, 15-195 Białystok, Poland; (B.Ł.); (P.K.)
| | - Piotr Kaczyński
- Institute of Plant Protection—National Research Institute, Chełmońskiego 22 Street, 15-195 Białystok, Poland; (B.Ł.); (P.K.)
| | - Józefa Wiater
- Department of Agri-Food Engineering and Environmental Management, Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, Wiejska 45E Street, 15-351 Białystok, Poland;
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5
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Pacheco JHL, Elizondo G. Interplay between Estrogen, Kynurenine, and AHR Pathways: An immunosuppressive axis with therapeutic potential for breast cancer treatment. Biochem Pharmacol 2023; 217:115804. [PMID: 37716620 DOI: 10.1016/j.bcp.2023.115804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 09/11/2023] [Accepted: 09/11/2023] [Indexed: 09/18/2023]
Abstract
Breast cancer is one of the most common malignancies among women worldwide. Estrogen exposure via endogenous and exogenous sources during a lifetime, together with environmental exposure to estrogenic compounds, represent the most significant risk factor for breast cancer development. As breast tumors establish, multiple pathways are deregulated. Among them is the aryl hydrocarbon receptor (AHR) signaling pathway. AHR, a ligand-activated transcription factor associated with the metabolism of polycyclic aromatic hydrocarbons and estrogens, is overexpressed in breast cancer. Furthermore, AHR and estrogen receptor (ER) cross-talk pathways have been observed. Additionally, the Tryptophan (Trp) catabolizing enzymes indolamine-2,3-dioxygenase (IDO) and tryptophan-2,3-dioxygenase (TDO) are overexpressed in breast cancer. IDO/TDO catalyzes the formation of Kynurenine (KYN) and other tryptophan-derived metabolites, which are ligands of AHR. Once KYN activates AHR, it stimulates the expression of the IDO enzyme, increases the level of KYN, and activates non-canonical pathways to control inflammation and immunosuppression in breast tumors. The interplay between E2, AHR, and IDO/TDO/KYN pathways and their impact on the immune system represents an immunosuppressive axis on breast cancer. The potential modulation of the immunosuppressive E2-AHR-IDO/TDO/KYN axis has aroused great expectations in oncotherapy. The present article will review the mechanisms implicated in generating the immunosuppressive axis E2-AHR-IDO/TDO/KYN in breast cancer and the current state of knowledge as a potential therapeutic target.
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Affiliation(s)
| | - Guillermo Elizondo
- Departamento de Biología Celular, CINVESTAV-IPN, Av. IPN 2508, C.P. 07360 Ciudad de México, México.
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6
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Opitz CA, Holfelder P, Prentzell MT, Trump S. The complex biology of aryl hydrocarbon receptor activation in cancer and beyond. Biochem Pharmacol 2023; 216:115798. [PMID: 37696456 PMCID: PMC10570930 DOI: 10.1016/j.bcp.2023.115798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/08/2023] [Accepted: 09/08/2023] [Indexed: 09/13/2023]
Abstract
The aryl hydrocarbon receptor (AHR) signaling pathway is a complex regulatory network that plays a critical role in various biological processes, including cellular metabolism, development, and immune responses. The complexity of AHR signaling arises from multiple factors, including the diverse ligands that activate the receptor, the expression level of AHR itself, and its interaction with the AHR nuclear translocator (ARNT). Additionally, the AHR crosstalks with the AHR repressor (AHRR) or other transcription factors and signaling pathways and it can also mediate non-genomic effects. Finally, posttranslational modifications of the AHR and its interaction partners, epigenetic regulation of AHR and its target genes, as well as AHR-mediated induction of enzymes that degrade AHR-activating ligands may contribute to the context-specificity of AHR activation. Understanding the complexity of AHR signaling is crucial for deciphering its physiological and pathological roles and developing therapeutic strategies targeting this pathway. Ongoing research continues to unravel the intricacies of AHR signaling, shedding light on the regulatory mechanisms controlling its diverse functions.
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Affiliation(s)
- Christiane A Opitz
- German Cancer Research Center (DKFZ), Heidelberg, Division of Metabolic Crosstalk in Cancer and the German Cancer Consortium (DKTK), DKFZ Core Center Heidelberg, 69120 Heidelberg, Germany; Neurology Clinic and National Center for Tumor Diseases, 69120 Heidelberg, Germany.
| | - Pauline Holfelder
- German Cancer Research Center (DKFZ), Heidelberg, Division of Metabolic Crosstalk in Cancer and the German Cancer Consortium (DKTK), DKFZ Core Center Heidelberg, 69120 Heidelberg, Germany; Faculty of Bioscience, Heidelberg University, 69120 Heidelberg, Germany
| | - Mirja Tamara Prentzell
- German Cancer Research Center (DKFZ), Heidelberg, Division of Metabolic Crosstalk in Cancer and the German Cancer Consortium (DKTK), DKFZ Core Center Heidelberg, 69120 Heidelberg, Germany; Faculty of Bioscience, Heidelberg University, 69120 Heidelberg, Germany
| | - Saskia Trump
- Molecular Epidemiology Unit, Berlin Institute of Health at Charité and the German Cancer Consortium (DKTK), Partner Site Berlin, a partnership between DKFZ and Charité -Universitätsmedizin Berlin, 10117 Berlin, Germany
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7
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Patel TD, Nakka M, Grimm SL, Coarfa C, Gorelick DA. Functional genomic analysis of non-canonical DNA regulatory elements of the aryl hydrocarbon receptor. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.01.538985. [PMID: 37205451 PMCID: PMC10187216 DOI: 10.1101/2023.05.01.538985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The aryl hydrocarbon receptor (AHR) is a ligand-dependent transcription factor that binds DNA and regulates genes in response to halogenated and polycyclic aromatic hydrocarbons. AHR also regulates the development and function of the liver and the immune system. In the canonical pathway, AHR binds a consensus DNA sequence, termed the xenobiotic response element (XRE), recruits protein coregulators, and regulates target gene expression. Emerging evidence suggests that AHR may regulate gene expression via an additional pathway, by binding to a non-consensus DNA sequence termed the non-consensus XRE (NC-XRE). The prevalence of NC-XRE motifs in the genome is not known. Studies using chromatin immunoprecipitation and reporter genes provide indirect evidence of AHR-NC-XRE interactions, but direct evidence for an AHR-NCXRE interaction that regulates transcription in a natural genomic context is lacking. Here, we analyzed AHR binding to NC-XRE DNA on a genome-wide scale in mouse liver. We integrated ChIP-seq and RNA-seq data and identified putative AHR target genes with NC-XRE motifs in regulatory regions. We also performed functional genomics at a single locus, the mouse Serpine1 gene. Deleting NC-XRE motifs from the Serpine1 promoter reduced the upregulation of Serpine1 by TCDD, an AHR ligand. We conclude that AHR upregulates Serpine1 via NC-XRE DNA. NC-XRE motifs are prevalent throughout regions of the genome where AHR binds. Taken together, our results suggest that AHR regulates genes via NC-XRE motifs. Our results will also improve our ability to identify AHR target genes and their physiologic relevance.
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Affiliation(s)
- Tajhal D Patel
- Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Manjula Nakka
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, USA
| | - Sandra L Grimm
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, USA
- Department of Molecular & Cellular Biology, Baylor College of Medicine, Houston, Texas, USA
- Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Cristian Coarfa
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, USA
- Department of Molecular & Cellular Biology, Baylor College of Medicine, Houston, Texas, USA
- Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, Texas, USA
| | - Daniel A Gorelick
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, USA
- Department of Molecular & Cellular Biology, Baylor College of Medicine, Houston, Texas, USA
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8
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Khazaal AQ, Haque N, Krager CR, Krager SL, Chambers C, Wilber A, Tischkau SA. Aryl hydrocarbon receptor affects circadian-regulated lipolysis through an E-Box-dependent mechanism. Mol Cell Endocrinol 2023; 559:111809. [PMID: 36283500 PMCID: PMC10509633 DOI: 10.1016/j.mce.2022.111809] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 10/17/2022] [Accepted: 10/19/2022] [Indexed: 11/06/2022]
Abstract
An internal circadian clock regulates timing of systemic energy homeostasis. The central clock in the hypothalamic suprachiasmatic nucleus (SCN) directs local clocks in peripheral tissues such as liver, muscle, and adipose tissue to synchronize metabolism with food intake and rest/activity cycles. Aryl hydrocarbon receptor (AhR) interacts with the molecular circadian clockworks. Activation of AhR dampens rhythmic expression of core clock genes, which may lead to metabolic dysfunction. Given the importance of appropriately-timed adipose tissue function to regulation of energy homeostasis, this study focused on mechanisms by which AhR may influence clock-controlled adipose tissue activity. We hypothesized that AhR activation in adipose tissue would impair lipolysis by dampening adipose rhythms, leading to a decreased lipolysis rate during fasting, and subsequently, altered serum glucose concentrations. Levels of clock gene and lipolysis gene transcripts in mouse mesenchymal stem cells (BMSCs) differentiated into mature adipocytes were suppressed by the AhR agonist β-napthoflavone (BNF), in an AhR dependent manner. BNF altered rhythms of core clock gene and lipolysis gene transcripts in C57bl6/J mice. BNF reduced serum free fatty acids, glycerol and liver glycogen. Chromatin immunoprecipitation indicated that BNF increased binding of AhR to E-Box elements in clock gene and lipolysis gene promoters. These data establish a link between AhR activation and impaired lipolysis, specifically by altering adipose tissue rhythmicity. In response to the decreased available energy from impaired lipolysis, the body increases glycogenolysis, thereby degrading more glycogen to provide necessary energy.
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Affiliation(s)
- Ali Qasim Khazaal
- Biotechnology Department, College of Science, University of Baghdad, Baghdad, Iraq; Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Nazmul Haque
- Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Callie R Krager
- Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Stacey L Krager
- Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Christopher Chambers
- Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Andrew Wilber
- Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Shelley A Tischkau
- Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, USA; Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, IL, USA.
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Malekinejad F, Fink-Gremmels J, Malekinejad H. Zearalenone and its metabolite exposure directs oestrogen metabolism towards potentially carcinogenic metabolites in human breast cancer MCF-7 cells. Mycotoxin Res 2022; 39:45-56. [PMID: 36517666 DOI: 10.1007/s12550-022-00472-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 11/20/2022] [Accepted: 11/22/2022] [Indexed: 12/23/2022]
Abstract
Zearalenone (ZEN) is produced by Fusarium species contaminating various agriculture crops. In this study, the effects of ZEN and its metabolites α-zearalenol (α-ZEL), and β-zearalenol (β-ZEL) on the formation of carcinogenic oestrogen-catechols in MCF-7 cells were investigated. To assess the effects of mycoestrogens on the activity of cytochrome P450 1A1 and CYP1B1, the rate of ethoxyresorufin O-deethylation (EROD-assay) was measured. The effects of mycoestrogens on the expression of CYP 1A1, CYP 1B1, aryl-hydrocarbon receptor (AhR), and oestrogen receptor alpha (ERα) were determined by qPCR. The catechol-O-methyltransferase (COMT) activity was measured as the ratio of the methoxy metabolites of oestradiol. Results show that mycoestrogens inhibited significantly the CYP1-dependent EROD activities. In the presence of selective inhibitors, mycoestrogens reduced CYP 1A1 and enhanced CYP 1B1 activity. Quantitative PCR analyses demonstrated the upregulation of AhR and confirmed the selective effect of mycoestrogens on CYP1 expression levels and the decline of the CYP 1A1/CYP 1B1 ratio. Mycoestrogens increased the ratio of 4-MeOE to 2-MeOE2 formation significantly (P < 0.05). Our results suggest that the tested mycoestrogens increase the production of CYP1B1-mediated oestrogen catechol metabolites, directing the biotransformation of E2 towards 4-OHE2, which has been identified earlier as a crucial factor in oestrogen-induced tumour initiation.
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10
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Morin SM, Majhi PD, Crisi GM, Gregory KJ, Franca R, Schalet B, Mason H, Casaubon JT, Cao QJ, Haddad S, Makari-Judson G, Jerry DJ, Schneider SS. Interindividual variation contributes to differential PCB 126 induced gene expression in primary breast epithelial cells and tissues. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 241:113722. [PMID: 35724515 DOI: 10.1016/j.ecoenv.2022.113722] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 05/27/2022] [Accepted: 05/29/2022] [Indexed: 06/15/2023]
Abstract
PCB 126 is a pervasive, dioxin-like chemical pollutant which can activate the aryl hydrocarbon receptor (AhR). Despite being banned from the market, PCB 126 can be detected in breast milk to this day. The extent to which interindividual variation impacts the adverse responses to this chemical in the breast tissue remains unclear. This study aimed to investigate the impact of 3 nM PCB 126 on gene expression in a panel of genetically diverse benign human breast epithelial cell (HBEC) cultures and patient derived breast tissues. Six patient derived HBEC cultures were treated with 3 nM PCB 126. RNAseq was used to interrogate the impact of exposure on differential gene expression. Gene expression changes from the top critical pathways were confirmed via qRT-PCR in a larger panel of benign patient derived HBEC cultures, as well as in patient-derived breast tissue explant cultures. RNAseq analysis of HBEC cultures revealed a signature of 144 genes significantly altered by 3 nM PCB 126 treatment. Confirmation of 8 targets using a panel of 12 HBEC cultures and commercially available breast cell lines demonstrated that while the induction of canonical downstream target gene, CYP1A1, was consistent across our primary HBECs, other genes including AREG, S100A8, IL1A, IL1B, MMP7, and CCL28 exhibited significant variability across individuals. The dependence on the activity of the aryl hydrocarbon receptor was confirmed using inhibitors. PCB 126 can induce significant and consistent changes in gene expression associated with xenobiotic metabolism in benign breast epithelial cells. Although the induction of most genes was reliant on the AhR, significant variability was noted between genes and individuals. These data suggest that there is a bifurcation of the pathway following AhR activation that contributes to the variation in interindividual responses.
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Affiliation(s)
- Stephanie M Morin
- Pioneer Valley Life Sciences Institute, Springfield, MA 01199, United States; Dept of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA 01003, United States
| | - Prabin Dhangada Majhi
- Dept of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA 01003, United States
| | - Giovanna M Crisi
- University of Massachusetts Chan Medical School-Baystate, Department of Pathology, Springfield, MA 01199, United States
| | - Kelly J Gregory
- Pioneer Valley Life Sciences Institute, Springfield, MA 01199, United States
| | - Renata Franca
- Pioneer Valley Life Sciences Institute, Springfield, MA 01199, United States
| | - Benjamin Schalet
- University of Massachusetts Chan Medical School-Baystate, Department of Surgery, Springfield, MA 01199, United States
| | - Holly Mason
- University of Massachusetts Chan Medical School-Baystate, Department of Surgery, Springfield, MA 01199, United States
| | - Jesse Thomas Casaubon
- University of Massachusetts Chan Medical School-Baystate, Department of Surgery, Springfield, MA 01199, United States
| | - Qing Jackie Cao
- University of Massachusetts Chan Medical School-Baystate, Department of Pathology, Springfield, MA 01199, United States
| | - Sandra Haddad
- Dept of Science, Bay Path University, Longmeadow, MA 01106, United States
| | - Grace Makari-Judson
- University of Massachusetts Chan Medical School-Baystate, Division of Hematology-Oncology, Springfield, MA, United States
| | - D Joseph Jerry
- Pioneer Valley Life Sciences Institute, Springfield, MA 01199, United States; Dept of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA 01003, United States
| | - Sallie S Schneider
- Pioneer Valley Life Sciences Institute, Springfield, MA 01199, United States; Dept of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA 01003, United States; University of Massachusetts Chan Medical School-Baystate, Department of Surgery, Springfield, MA 01199, United States.
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11
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Haque N, Tischkau SA. Sexual Dimorphism in Adipose-Hypothalamic Crosstalk and the Contribution of Aryl Hydrocarbon Receptor to Regulate Energy Homeostasis. Int J Mol Sci 2022; 23:ijms23147679. [PMID: 35887027 PMCID: PMC9322714 DOI: 10.3390/ijms23147679] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/08/2022] [Accepted: 07/09/2022] [Indexed: 11/16/2022] Open
Abstract
There are fundamental sex differences in the regulation of energy homeostasis. Better understanding of the underlying mechanisms of energy balance that account for this asymmetry will assist in developing sex-specific therapies for sexually dimorphic diseases such as obesity. Multiple organs, including the hypothalamus and adipose tissue, play vital roles in the regulation of energy homeostasis, which are regulated differently in males and females. Various neuronal populations, particularly within the hypothalamus, such as arcuate nucleus (ARC), can sense nutrient content of the body by the help of peripheral hormones such leptin, derived from adipocytes, to regulate energy homeostasis. This review summarizes how adipose tissue crosstalk with homeostatic network control systems in the brain, which includes energy regulatory regions and the hypothalamic–pituitary axis, contribute to energy regulation in a sex-specific manner. Moreover, development of obesity is contingent upon diet and environmental factors. Substances from diet and environmental contaminants can exert insidious effects on energy metabolism, acting peripherally through the aryl hydrocarbon receptor (AhR). Developmental AhR activation can impart permanent alterations of neuronal development that can manifest a number of sex-specific physiological changes, which sometimes become evident only in adulthood. AhR is currently being investigated as a potential target for treating obesity. The consensus is that impaired function of the receptor protects from obesity in mice. AhR also modulates sex steroid receptors, and hence, one of the objectives of this review is to explain why investigating sex differences while examining this receptor is crucial. Overall, this review summarizes sex differences in the regulation of energy homeostasis imparted by the adipose–hypothalamic axis and examines how this axis can be affected by xenobiotics that signal through AhR.
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Affiliation(s)
- Nazmul Haque
- Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, IL 62702, USA;
| | - Shelley A. Tischkau
- Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, IL 62702, USA;
- Department of Medical Microbiology, Immunology and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL 62702, USA
- Correspondence:
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12
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Wang J, Mijiti Y, Chen Y, Liu Z. Aryl hydrocarbon receptor is a prognostic biomarker and is correlated with immune responses in cervical cancer. Bioengineered 2021; 12:11922-11935. [PMID: 34784845 PMCID: PMC8810191 DOI: 10.1080/21655979.2021.2006953] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Aryl hydrocarbon receptor (AHR) plays an important role in tumor development. However, its function in cervical cancer has not been fully elucidated. We evaluated the ten genes that are predicted to associate with AHR protein interaction. The comprehensive scores were: CYP1A1, ARNT2, HSP90AA1, ARNT, AIP, PTGES3, HSP90AB1, CYP1B1, ESR1, MAF, respectively. In addition, we showed that levels of AHR and its related genes were correlated with the immune infiltration and expression of immuno-regulators (immunoinhibitors, immunostimulators, MHC molecules) levels in cervical cancer. High expression of AHR, CYP1A1, HSP90AA1, and HSP90AB1 and low expression of ESR1 were negatively correlated with the prognoses of cervical cancer patients. The Cox multivariate regression showed that high expression of AHR (HR = 1.874, 95% CI = 1.069–3.285, P= 0.028) and CYP1A1 (HR = 1.822, 95%CI = 1.077–3.080, P= 0.025) were risk factors for prognosis in patients with cervical cancer. IHC results indicated that AHR and CYP1A1 were widely expressed in cervical cancer. These findings suggest that AHR and CYP1A1 may serve as prognostic biomarkers for determining prognosis and immune infiltration in cervical cancer.
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Affiliation(s)
- Jiasui Wang
- School of Public Health, Xinjiang Medical University, Urumqi, China
| | - Yilidana Mijiti
- The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Yalin Chen
- The Sixth Division Hospital of Xinjiang Production and Construction Corps, China
| | - Zaoling Liu
- School of Public Health, Xinjiang Medical University, Urumqi, China
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13
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Słowikowski BK, Jankowski M, Jagodziński PP. The smoking estrogens - a potential synergy between estradiol and benzo(a)pyrene. Biomed Pharmacother 2021; 139:111658. [PMID: 34243627 DOI: 10.1016/j.biopha.2021.111658] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 04/20/2021] [Accepted: 04/21/2021] [Indexed: 02/04/2023] Open
Abstract
According to recent statistics, Lung Cancer (LC) is one of the most frequently diagnosed tumor types, representing nearly 12% of all global cancer cases. Moreover, in recent years, an increased mortality rate and incidence of this cancer were observed, especially among nonsmokers. Lung cancer patients are often characterized by poor prognosis and low survival rates, which encourages the scientific community to investigate the biochemical and molecular processes leading to the development of this malignancy. Furthermore, the mechanisms of LC formation and progression are not yet fully elucidated due to their high complexity, as well as a multitude of environmental, genetic, and molecular factors involved. Even though LC's association with exposure to cigarette smoke is indisputable, current research provides evidence that the development of this cancer can also be affected by the presence of estrogens and their interaction with several tobacco smoke components. Hence, the main goal of this brief review was to investigate reports of a possible synergy between 17β estradiol (E2), the most biologically active estrogen, and benzo(a)pyrene (BaP), a strongly carcinogenic compound produced as a result of incomplete tobacco combustion. The literature sources demonstrate a possible carcinogenic synergy between estrogens, especially E2, and BaP, a toxic tobacco smoke component. Therefeore, the combined effect of disturbed estrogen production in cancer cells, as well as the molecular influence exerted by BaP, could explain the increased aggressiveness and rate of LC development. Summarizing, the synergistic effect of these risk factors is an interesting area of further research.
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Affiliation(s)
- Bartosz Kazimierz Słowikowski
- Department of Biochemistry and Molecular Biology, Poznan University of Medical Sciences, Święcickiego 6 Street, 60-781 Poznan, Poland.
| | - Maurycy Jankowski
- Department of Anatomy, Poznan University of Medical Sciences, Święcickiego 6 Street, 60-781 Poznan, Poland
| | - Paweł Piotr Jagodziński
- Department of Biochemistry and Molecular Biology, Poznan University of Medical Sciences, Święcickiego 6 Street, 60-781 Poznan, Poland
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14
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E-waste management: A review of recycling process, environmental and occupational health hazards, and potential solutions. ACTA ACUST UNITED AC 2021. [DOI: 10.1016/j.enmm.2020.100409] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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The Landscape of AhR Regulators and Coregulators to Fine-Tune AhR Functions. Int J Mol Sci 2021; 22:ijms22020757. [PMID: 33451129 PMCID: PMC7828596 DOI: 10.3390/ijms22020757] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 01/09/2021] [Accepted: 01/11/2021] [Indexed: 01/04/2023] Open
Abstract
The aryl-hydrocarbon receptor (AhR) is a ligand-activated transcription factor that mediates numerous cellular responses. Originally investigated in toxicology because of its ability to bind environmental contaminants, AhR has attracted enormous attention in the field of immunology in the last 20 years. In addition, the discovery of endogenous and plant-derived ligands points to AhR also having a crucial role in normal cell physiology. Thus, AhR is emerging as a promiscuous receptor that can mediate either toxic or physiologic effects upon sensing multiple exogenous and endogenous molecules. Within this scenario, several factors appear to contribute to the outcome of gene transcriptional regulation by AhR, including the nature of the ligand as such and its further metabolism by AhR-induced enzymes, the local tissue microenvironment, and the presence of coregulators or specific transcription factors in the cell. Here, we review the current knowledge on the array of transcription factors and coregulators that, by interacting with AhR, tune its transcriptional activity in response to endogenous and exogenous ligands.
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16
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Sarin H. Pressure regulated basis for gene transcription by delta-cell micro-compliance modeled in silico: Biphenyl, bisphenol and small molecule ligand models of cell contraction-expansion. PLoS One 2020; 15:e0236446. [PMID: 33021979 PMCID: PMC7537880 DOI: 10.1371/journal.pone.0236446] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 07/06/2020] [Indexed: 12/19/2022] Open
Abstract
Molecular diameter, lipophilicity and hydrophilicity exclusion affinity limits exist for small molecule carrier-mediated diffusion or transport through channel pores or interaction with the cell surface glycocalyx. The molecular structure lipophilicity limit for non-specific carrier-mediated transmembrane diffusion through polarity-selective transport channels of the cell membrane is Lexternal structure ∙ Hpolar group-1 of ≥ 1.07. The cell membrane channel pore size is > 0.752 and < 0.758 nm based on a 3-D ellipsoid model (biphenyl), and within the molecular diameter size range 0.744 and 0.762 nm based on a 2-D elliptical model (alkanol). The adjusted van der Waals diameter (vdWD, adj; nm) for the subset of halogenated vapors is predictive of the required MAC for anesthetic potency at an initial (-) Δ Cmicro effect. The molecular structure L ∙ Hpolar group-1 for Neu5Ac is 0.080, and the L ∙ Hpolar group-1 interval range for the cell surface glycocalyx hydrophilicity barrier interaction is 0.101 (Saxitoxin, Stx; Linternal structure ∙ Hpolar group-1) - 0.092 (m-xylenediamine, Lexternal structure · Hpolar group). Differential predictive effective pressure mapping of gene activation or repression reveals that p-dioxin exposure results in activation of AhR-Erβ (Arnt)/Nrf-2, Pparδ, Errγ (LxRα), Dio3 (Dio2) and Trα limbs, and due to high affinity Dio2 and Dio3 (OH-TriCDD, Lext · H-1: 1.91–4.31) exothermy-antagonism (Δ contraction) with high affinity T4/rT3-TRα-mediated agonism (Δ expansion). co-planar PCB metabolite exposure (Lext · H-1: 1.95–3.91) results in activation of AhR (Erα/β)/Nrf2, Rev-Erbβ, Errα, Dio3 (Dio2) and Trα limbs with a Δ Cmicro contraction of 0.89 and Δ Cmicro expansion of 1.05 as compared to p-dioxin. co-, ortho-planar PCB metabolite exposure results in activation of Car/PxR, Pparα (Srebf1,—Lxrβ), Arnt (AhR-Erβ), AR, Dio1 (Dio2) and Trβ limbs with a Δ Cmicro contraction of 0.73 and Δ Cmicro expansion of 1.18 (as compared to p-dioxin). Bisphenol A exposure (Lext struct ∙ H-1: 1.08–1.12, BPA–BPE, Errγ; BPAF, Lext struct ∙ H-1: 1.23, CM Erα, β) results in increased duration at Peff for Timm8b (Peff 0.247) transcription and in indirect activation of the AhR/Nrf-2 hybrid pathway with decreased duration at Peff 0.200 (Nrf1) and increased duration at Peff 0.257 (Dffa). The Bpa/Bpaf convergent pathway Cmicro contraction-expansion response increase in the lower Peff interval is 0.040; in comparison, small molecule hormone Δ Cmicro contraction-expansion response increases in the lower Peff intervals for gene expression ≤ 0.168 (Dex· GR) ≥ 0.156 (Dht · AR), with grade of duration at Peff (min·count) of 1.33x105 (Dex/Cort) and 1.8–2.53x105 (Dht/R1881) as compared to the (-) coupled (+) Δ CmicroPeff to 0.136 (Wnt5a, Esr2) with applied DES (1.86x106). The subtype of trans-differentiated cell as a result of an applied toxin or toxicant is predictable by delta-Cmicro determined by Peff mapping. Study findings offer additional perspective on the basis for pressure regulated gene transcription by alterations in cell micro-compliance (Δ contraction-expansion, Cmicro), and are applicable for the further predictive modeling of gene to gene transcription interactions, and small molecule modulation of cell effective pressure (Peff) and its potential.
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Affiliation(s)
- Hemant Sarin
- Freelance Investigator in Translational Science and Medicine, Charleston, West Virginia, United States of America
- * E-mail:
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17
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Ishihara Y, Haarmann-Stemmann T, Kado NY, Vogel CFA. Interleukin 33 Expression Induced by Aryl Hydrocarbon Receptor in Macrophages. Toxicol Sci 2020; 170:404-414. [PMID: 31093659 DOI: 10.1093/toxsci/kfz114] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Polycyclic aromatic hydrocarbons (PAHs) contained in airborne particulate matter have been identified as a contributing factor for inflammation in the respiratory tract. Recently, interleukin-33 (IL-33) is strongly suggested to be associated with airway inflammation. Aryl hydrocarbon receptor (AhR) is a receptor for PAHs to regulate several metabolic enzymes, but the relationships between AhR and airway inflammation are still unclear. In this study, we examined the role of AhR in the expression of IL-33 in macrophages. THP-1 macrophages mainly expressed IL-33 variant 5, which in turn was strongly induced by the AhR agonists 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (TCDD) and kynurenine (KYN). AhR antagonist CH223191 suppressed the increase in IL-33 expression. Promoter analysis revealed that the IL-33 promoter has 2 dioxin response elements (DREs). AhR was recruited to both DREs after treatment with TCDD or KYN as assessed by gel shift and chromatin immunoprecipitation assays. A luciferase assay showed that one of the DREs was functional and involved in the expression of IL-33. Macrophages isolated from AhR-null mice expressed only low levels of IL-33 even in response to treatment with AhR ligands compared with wild-type cells. The treatment of THP-1 macrophages with diesel particulate matter and particle extracts increased the mRNA and protein expression of IL-33. Taken together, the results show that ligand-activated AhR mediates the induction of IL-33 in macrophages via a DRE located in the IL-33 promoter region. AhR-mediated IL-33 induction could be involved in the exacerbation and/or prolongation of airway inflammation elicited by toxic chemical substances.
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Affiliation(s)
- Yasuhiro Ishihara
- Center for Health and the Environment, University of California, Davis 95616, California.,Program of Biomedical Science, Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima 739-8521, Japan
| | | | - Norman Y Kado
- Center for Health and the Environment, University of California, Davis 95616, California.,Department of Environmental Toxicology, University of California, Davis 95616, California.,Air Resources Board, California Environmental Protection Agency, Sacramento 95812, California
| | - Christoph F A Vogel
- Center for Health and the Environment, University of California, Davis 95616, California.,Department of Environmental Toxicology, University of California, Davis 95616, California
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18
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Souder JP, Gorelick DA. ahr2, But Not ahr1a or ahr1b, Is Required for Craniofacial and Fin Development and TCDD-dependent Cardiotoxicity in Zebrafish. Toxicol Sci 2020; 170:25-44. [PMID: 30907958 DOI: 10.1093/toxsci/kfz075] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The aryl hydrocarbon receptor (AHR) is a ligand-activated transcription factor that binds environmental toxicants and regulates gene expression. AHR also regulates developmental processes, like craniofacial development and hematopoiesis, in the absence of environmental exposures. Zebrafish have 3 paralogs of AHR: ahr1a, ahr1b, and ahr2. Adult zebrafish with mutations in ahr2 exhibited craniofacial and fin defects. However, the degree to which ahr1a and ahr1b influence ahr2 signaling and contribute to fin and craniofacial development are not known. We compared morphology of adult ahr2 mutants and ahr1a;ahr1b single and double mutant zebrafish. We found that ahr1a;ahr1b single and double mutants were morphologically normal whereas ahr2 mutant zebrafish demonstrated fin and craniofacial malformations. At 5 days post fertilization, both ahr1a;ahr1b and ahr2 mutant larvae were normal, suggesting that adult phenotypes are due to defects in maturation or maintenance. Next, we analyzed the function of zebrafish AHRs activated by environmental ligands. The prototypical AHR ligand, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), induces toxicity in humans and rodents via AHR and causes cardiotoxicity in zebrafish embryos. It has been shown that embryos with mutations in ahr2 are resistant to TCDD toxicity, yet it is unclear whether ahr1 receptors are required. Furthermore, though AHR was shown to interact with estrogen receptor alpha following TCDD treatment, it is not known whether this interaction is constitutive or context-dependent. To determine whether estrogen receptors are constitutive cofactors for AHR signaling, we used genetic and pharmacologic techniques to analyze TCDD-dependent toxicity in estrogen receptor and ahr mutant embryos. We found that embryos with mutations in ahr1a;ahr1b or estrogen receptor genes are susceptible to TCDD toxicity whereas ahr2 mutant embryos are TCDD-resistant. Moreover, pharmacologic blockade of nuclear estrogen receptors failed to prevent TCDD toxicity. These findings suggest that ahr1 genes do not have overlapping functions with ahr2 in fin and craniofacial development or TCDD-dependent toxicity, and that estrogen receptors are not constitutive partners of ahr2.
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Affiliation(s)
- Jaclyn P Souder
- Medical Scientist Training Program & Department of Pharmacology and Toxicology, University of Alabama at Birmingham, Birmingham, Alabama, 35294.,Department of Molecular and Cellular Biology, Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, 77030
| | - Daniel A Gorelick
- Medical Scientist Training Program & Department of Pharmacology and Toxicology, University of Alabama at Birmingham, Birmingham, Alabama, 35294.,Department of Molecular and Cellular Biology, Center for Precision Environmental Health, Baylor College of Medicine, Houston, Texas, 77030
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19
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Giampaolino P, Della Corte L, Foreste V, Barra F, Ferrero S, Bifulco G. Dioxin and endometriosis: a new possible relation based on epigenetic theory. Gynecol Endocrinol 2020; 36:279-284. [PMID: 31805795 DOI: 10.1080/09513590.2019.1698024] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Endometriosis is a chronic disease characterized by the growth of endometrial-like glands and stroma outside the uterine cavity. Nowadays, the exact etiology of endometriosis is unclear and the interaction between a variety of environmental physical and chemical compounds may potentially promote the disease in women with an individual susceptibility. The first demonstration of a relation between an environmental factor and endometriosis was obtained with the chronic dietary exposure of a primate colony to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). Besides the well-known dioxin's pathway of action, several papers are focusing on the role of epigenetic mechanisms, a way through which the genome responds to the environment and can lead to permanent changes in gene expression until affecting the phenotypes or cause disease. In this review, we focus on the possible role of dioxin epigenetics modification in endometriosis.
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Affiliation(s)
| | - Luigi Della Corte
- Department of Neuroscience, Reproductive Sciences and Dentistry, School of Medicine, University of Naples Federico II, Naples, Italy
| | - Virginia Foreste
- Department of Neuroscience, Reproductive Sciences and Dentistry, School of Medicine, University of Naples Federico II, Naples, Italy
| | - Fabio Barra
- Academic Unit of Obstetrics and Gynecology, Ospedale Policlinico San Martino, Genoa, Italy
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DiNOGMI), University of Genoa, Genoa, Italy
| | - Simone Ferrero
- Academic Unit of Obstetrics and Gynecology, Ospedale Policlinico San Martino, Genoa, Italy
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health (DiNOGMI), University of Genoa, Genoa, Italy
| | - Giuseppe Bifulco
- Department of Neuroscience, Reproductive Sciences and Dentistry, School of Medicine, University of Naples Federico II, Naples, Italy
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20
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Tarnow P, Zordick C, Bottke A, Fischer B, Kühne F, Tralau T, Luch A. Characterization of Quinoline Yellow Dyes As Transient Aryl Hydrocarbon Receptor Agonists. Chem Res Toxicol 2020; 33:742-750. [PMID: 31957441 DOI: 10.1021/acs.chemrestox.9b00351] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aryl hydrocarbon receptor (AHR) and estrogen receptor alpha (ERα) are two ligand activated transcription factors that are targeted by a wide range of anthropogenic compounds. Crosstalk between both receptors is well established but little understood. We previously developed a dual color luciferase assay (i.e., XEER) which allows time dissolved monitoring of the activation of both receptors in situ. The system was now used in conjunction with HPLC-qTOF to identify several quinophthalone dyes as transient receptor agonists of the AHR. Altogether the approach identified three widely used dyes, that is the plastic colorant latyl yellow 3G (LY), the structurally related textile dye disperse yellow 64 (DY), and the cosmetic dye quinoline yellow (QY). The latter was the most potent agonist followed by LY and DY as confirmed by the XEER assay and CYP1A1 gene induction in MCF7 cells. In addition QY, LY, and DY also inhibited ER signaling in an AHR-dependent manner. This establishes some evidence for quinoline yellow dyes as potential disruptors of AHR/ER signaling, raising potential toxicological concern. Although none of the dyes featured any signs of genotoxicity in vitro, our data point to the need for a systematic approach when screening for substances of potential toxicological and endocrine relevance.
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Affiliation(s)
- Patrick Tarnow
- German Federal Institute for Risk Assessment, Department of Chemical and Product Safety, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany
| | - Catrin Zordick
- German Federal Institute for Risk Assessment, Department of Chemical and Product Safety, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany
| | - Alex Bottke
- German Federal Institute for Risk Assessment, Department of Chemical and Product Safety, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany
| | - Berit Fischer
- German Federal Institute for Risk Assessment, Department of Chemical and Product Safety, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany
| | - Friederike Kühne
- German Federal Institute for Risk Assessment, Department of Chemical and Product Safety, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany
| | - Tewes Tralau
- German Federal Institute for Risk Assessment, Department of Chemical and Product Safety, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany
| | - Andreas Luch
- German Federal Institute for Risk Assessment, Department of Chemical and Product Safety, Max-Dohrn-Strasse 8-10, 10589 Berlin, Germany
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21
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Dolciami D, Ballarotto M, Gargaro M, López-Cara LC, Fallarino F, Macchiarulo A. Targeting Aryl hydrocarbon receptor for next-generation immunotherapies: Selective modulators (SAhRMs) versus rapidly metabolized ligands (RMAhRLs). Eur J Med Chem 2019; 185:111842. [PMID: 31727470 DOI: 10.1016/j.ejmech.2019.111842] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 10/30/2019] [Accepted: 10/30/2019] [Indexed: 12/12/2022]
Abstract
Aryl Hydrocarbon Receptor (AhR) constitutes a major network hub of genomic and non-genomic signaling pathways, connecting host's immune cells to environmental factors. It shapes innate and adaptive immune processes to environmental stimuli with species-, cell- and tissue-type dependent specificity. Although an ever increasing number of studies has thrust AhR into the limelight as attractive target for the development of next-generation immunotherapies, concerns exist on potential safety issues associated with small molecule modulation of the receptor. Selective AhR modulators (SAhRMs) and rapidly metabolized AhR ligands (RMAhRLs) are two classes of receptor agonists that are emerging as interesting lead compounds to bypass AhR-related toxicity in favor of therapeutic effects. In this article, we discuss SAhRMs and RMAhRLs reported in literature, covering concepts underlying their definitions, specific binding modes, structure-activity relationships and AhR-mediated functions.
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Affiliation(s)
- Daniela Dolciami
- Department of Pharmaceutical Sciences, University of Perugia, Via del Liceo, 1, 06123, Perugia, Italy
| | - Marco Ballarotto
- Department of Pharmaceutical Sciences, University of Perugia, Via del Liceo, 1, 06123, Perugia, Italy
| | - Marco Gargaro
- Department of Experimental Medicine, University of Perugia, Piazz.le Gambuli, 1, 06132, Perugia, Italy
| | - Luisa Carlota López-Cara
- Department of Pharmaceutical & Organic Chemistry, Faculty of Pharmacy, University of Granada, 18010, Granada, Spain
| | - Francesca Fallarino
- Department of Experimental Medicine, University of Perugia, Piazz.le Gambuli, 1, 06132, Perugia, Italy
| | - Antonio Macchiarulo
- Department of Pharmaceutical Sciences, University of Perugia, Via del Liceo, 1, 06123, Perugia, Italy.
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22
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Yoshinouchi Y, Shimizu S, Lee JS, Hirano M, Suzuki KIT, Kim EY, Iwata H. In vitro assessment of effects of persistent organic pollutants on the transactivation of estrogen receptor α and β (ERα and ERβ) from the Baikal seal (Pusa sibirica). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 181:463-471. [PMID: 31228822 DOI: 10.1016/j.ecoenv.2019.06.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 06/06/2019] [Accepted: 06/11/2019] [Indexed: 06/09/2023]
Abstract
To assess the effect of exposure to persistent organic pollutants (POPs) on the estrogen receptor (ER) signaling pathway in Baikal seals (Pusa sibirica), we investigated the molecular characterizations and functions of two Baikal seal ER (bsER) isoforms, bsERα and bsERβ. The bsERα and bsERβ cDNA clones isolated have an open reading frame of 595 and 530 amino acid residues, respectively. The tissue distribution analyses of bsER mRNAs showed that bsERα transcripts were primarily found in the ovary and uterus, and bsERβ in the muscle in wild Baikal seals. The immunofluorescence staining assay showed that 17β-estradiol (E2) treatment promoted the nuclear translocation of in vitro-expressed bsERα. Transient transfection of bsERα in U2OS cells enhanced the transcription of pS2, an ER target gene of E2. We then measured bsER-mediated transactivation potencies of POPs in an in vitro reporter gene assay system, in which a bsERα or bsERβ expression vector was transfected into COS-1 cells. For comparison, transactivation potencies of POPs on mouse ERs (mERα and mERβ) were also evaluated in the same manner. Results showed significant dose-dependent responses of bsERs and mERs when treated with p,p'-dichlorodiphenyltrichloroethane (p,p'-DDT), and p,p'-dichlorodiphenyldichloroethylene (p,p'-DDE). bsERs and mERs showed no response when exposed to polychlorinated biphenyls (PCBs) or 2,3,7,8-tetrachlorodibenzo-p-dioxin. Comparison of the dose-response curves of DDTs across species (bsERs vs. mERs) showed that bsERα had a response similar to mERα, but bsERβ was less sensitive than mERβ. Comparing the lowest observable effective concentrations of p,p'-DDT (2.8 μM) and p,p'-DDE (10 μM) for in vitro bsERα-mediated transactivation with their hepatic concentrations in wild Baikal seals indicated that some individuals accumulated these compounds at levels comparable to the effective concentrations, suggesting the potential disruption of the bsERα signaling pathway in the wild population by these compounds. Co-transfection experiments with bsER and the aryl hydrocarbon receptor (AHR) suggested that high accumulation of estrogenic compounds exerts a synergistic effect with dioxin-like congeners on ER signaling through AHR activation in the wild seal population.
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Affiliation(s)
- Yuka Yoshinouchi
- Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho 2-5, Matsuyama, 790-8577, Japan
| | - Sachiko Shimizu
- Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho 2-5, Matsuyama, 790-8577, Japan
| | - Jin-Seon Lee
- Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho 2-5, Matsuyama, 790-8577, Japan
| | - Masashi Hirano
- Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho 2-5, Matsuyama, 790-8577, Japan
| | - Ken-Ichi T Suzuki
- Department of Mathematical and Life Sciences, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Eun-Young Kim
- Department of Life and Nanopharmaceutical Science and Department of Biology, Kyung Hee University, Hoegi-Dong, Dongdaemun-Gu, Seoul, 130-701, Republic of Korea
| | - Hisato Iwata
- Center for Marine Environmental Studies (CMES), Ehime University, Bunkyo-cho 2-5, Matsuyama, 790-8577, Japan.
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Hýžd'alová M, Pivnicka J, Zapletal O, Vázquez-Gómez G, Matthews J, Neca J, Pencíková K, Machala M, Vondrácek J. Aryl Hydrocarbon Receptor-Dependent Metabolism Plays a Significant Role in Estrogen-Like Effects of Polycyclic Aromatic Hydrocarbons on Cell Proliferation. Toxicol Sci 2019; 165:447-461. [PMID: 30137621 DOI: 10.1093/toxsci/kfy153] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are widespread environmental contaminants that interact in a complex manner with both the aryl hydrocarbon receptor (AhR) and estrogen receptors (ER). Their potential endocrine-disrupting activities may depend on both inhibitory AhR-ER cross-talk and on AhR-dependent metabolic production of estrogenic PAH metabolites. Here, we analyzed the impact of AhR on estrogen-like effects of PAHs, such as benzo[a]pyrene (BaP), in particular, on control of cell cycle progression/cell proliferation. Using AhR knockout variant of estrogen-sensitive human breast cancer MCF-7 cells (MCF-7 AhRKO cells), we observed that the AhR-dependent control of cytochrome P450 family 1 (CYP1) expression played a major role in formation of estrogenic BaP metabolites, most notably 3-OH-BaP, which contributed to the ER-dependent induction of cell cycle progression/cell proliferation. Both BaP metabolism and the BaP-induced S-phase transition/cell proliferation were inhibited in MCF-7 AhRKO cells, whereas these cells remained sensitive towards both endogenous estrogen 17β-estradiol or hydroxylated BaP metabolites. BaP was found to increase the activity of ER-dependent luciferase reporter gene in wild-type MCF-7 cells; however, unlike its hydroxylated metabolite, BaP failed to stimulate luciferase activity in MCF-7 AhRKO cells. Similarly, estrogen-like effects of other known estrogenic PAHs, such as benz[a]anthracene or 3-methylcholanthrene, were diminished in MCF-7 AhRKO cells. Ectopic expression of human CYP1A1 and CYP1B1 enzymes partly restored both BaP metabolism and its effects on cell proliferation. Taken together, our data suggest that the AhR-dependent metabolism of PAHs contributes significantly to the impact of PAHs on cell proliferation in estrogen-sensitive cells.
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Affiliation(s)
- Martina Hýžd'alová
- Department of Cytokinetics, Institute of Biophysics of the Czech Academy of Sciences, 61265 Brno, Czech Republic.,Department of Chemistry and Toxicology, Veterinary Research Institute, 62100 Brno, Czech Republic
| | - Jakub Pivnicka
- Department of Cytokinetics, Institute of Biophysics of the Czech Academy of Sciences, 61265 Brno, Czech Republic.,Department of Experimental Biology, Faculty of Science, Masaryk University, 61137 Brno, Czech Republic
| | - Ondrej Zapletal
- Department of Cytokinetics, Institute of Biophysics of the Czech Academy of Sciences, 61265 Brno, Czech Republic.,Department of Experimental Biology, Faculty of Science, Masaryk University, 61137 Brno, Czech Republic
| | - Gerardo Vázquez-Gómez
- Department of Cytokinetics, Institute of Biophysics of the Czech Academy of Sciences, 61265 Brno, Czech Republic.,Genomic Medicine and Environmental Toxicology Department, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México C.U, 04510 Mexico City, Mexico
| | - Jason Matthews
- Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, 0372 Oslo, Norway
| | - Jirí Neca
- Department of Chemistry and Toxicology, Veterinary Research Institute, 62100 Brno, Czech Republic
| | - Katerina Pencíková
- Department of Chemistry and Toxicology, Veterinary Research Institute, 62100 Brno, Czech Republic
| | - Miroslav Machala
- Department of Chemistry and Toxicology, Veterinary Research Institute, 62100 Brno, Czech Republic
| | - Jan Vondrácek
- Department of Cytokinetics, Institute of Biophysics of the Czech Academy of Sciences, 61265 Brno, Czech Republic
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Mobini K, Banakar E, Tamaddon G, Mohammadi-Bardbori A. 6-Formylindolo[3,2-b]carbazole (FICZ) Enhances The Expression of Tumor Suppressor miRNAs, miR-22, miR-515-5p, and miR-124-3p in MCF-7 Cells. CELL JOURNAL 2019; 22:115-120. [PMID: 31606975 PMCID: PMC6791069 DOI: 10.22074/cellj.2020.6549] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Accepted: 02/21/2019] [Indexed: 11/22/2022]
Abstract
Objective microRNAs (miRNAs) play bifunctional roles in the initiation and progression of cancer, and recent evidence
has confirmed that unusual expression of miRNAs is required for the progress of breast cancer. The regulatory role of
aryl hydrocarbon receptor (AhR) and its endogenous ligand, 6-formylindolo[3,2-b]carbazole (FICZ) on the expression
of tumor suppressor miRNAs, miR-22, miR-515-5p and miR-124-3p, as well as their association with the estrogen
receptor alpha (ERα) were the aims of this study.
Materials and Methods In this experimental study, the expression levels of miR-22, miR-515-5p, miR-124-3p and
miR-382-5p in MCF-7 cells were determined using the quantificational real time polymerase chain reaction (qRT-PCR)
assay.
Results Our results revealed that miR-22, miR-515-5p, and miR-124-3p expressions were significantly increased in
cells transfected with ERα siRNA. Our data also showed that miR-22, miR 515-5p, and miR-124-3p expression levels
were significantly increased following FICZ treatment. Here, we found that AhR/ERα cross-talk plays a critical role in
the expression of miR-22, miR-515-5p and miR-124-3p in MCF-7 cells.
Conclusion Overall, our data demonstrated that FICZ, as an AhR agonist could induce the expression of tumor
suppressor miRNAs, miR-22, miR-515-5p, and miR-124-3p; thus, FICZ might be regarded as a potential therapeutic
agent for breast cancer treatment.
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Affiliation(s)
- Keivan Mobini
- Department of Pharmacology and Toxicology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Elham Banakar
- Department of Pharmacology and Toxicology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Gholamhossein Tamaddon
- Diagnostic Laboratory Sciences and Technology Research Center, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Afshin Mohammadi-Bardbori
- Department of Pharmacology and Toxicology, School of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran.ElectronicAddress:
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Kettner NM, Vijayaraghavan S, Durak MG, Bui T, Kohansal M, Ha MJ, Liu B, Rao X, Wang J, Yi M, Carey JPW, Chen X, Eckols TK, Raghavendra AS, Ibrahim NK, Karuturi MS, Watowich SS, Sahin A, Tweardy DJ, Hunt KK, Tripathy D, Keyomarsi K. Combined Inhibition of STAT3 and DNA Repair in Palbociclib-Resistant ER-Positive Breast Cancer. Clin Cancer Res 2019; 25:3996-4013. [PMID: 30867218 PMCID: PMC6606366 DOI: 10.1158/1078-0432.ccr-18-3274] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 02/03/2019] [Accepted: 03/12/2019] [Indexed: 02/07/2023]
Abstract
PURPOSE Cyclin-dependent kinase 4/6 (CDK4/6) inhibitors are currently used in combination with endocrine therapy to treat advanced hormone receptor-positive, HER2-negative breast cancer. Although this treatment doubles time to progression compared with endocrine therapy alone, about 25%-35% of patients do not respond, and almost all patients eventually acquire resistance. Discerning the mechanisms of resistance to CDK4/6 inhibition is crucial in devising alternative treatment strategies. EXPERIMENTAL DESIGN Palbociclib-resistant cells (MCF-7 and T47D) were generated in a step-wise dose-escalading fashion. Whole-exome sequencing, genome-wide expression analysis, and proteomic analysis were performed in both resistant and parental (sensitive) cells. Pathway alteration was assessed mechanistically and pharmacologically. Biomarkers of altered pathways were examined in tumor samples from patients with palbociclib-treated breast cancer whose disease progressed while on treatment. RESULTS Palbociclib-resistant cells are cross-resistant to other CDK4/6 inhibitors and are also resistant to endocrine therapy (estrogen receptor downregulation). IL6/STAT3 pathway is induced, whereas DNA repair and estrogen receptor pathways are downregulated in the resistant cells. Combined inhibition of STAT3 and PARP significantly increased cell death in the resistant cells. Matched tumor samples from patients with breast cancer who progressed on palbociclib were examined for deregulation of estrogen receptor, DNA repair, and IL6/STAT3 signaling, and results revealed that these pathways are all altered as compared with the pretreatment tumor samples. CONCLUSIONS Palbociclib resistance induces endocrine resistance, estrogen receptor downregulation, and alteration of IL6/STAT3 and DNA damage response pathways in cell lines and patient samples. Targeting IL6/STAT3 activity and DNA repair deficiency using a specific STAT3 inhibitor combined with a PARP inhibitor could effectively treat acquired resistance to palbociclib.
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Affiliation(s)
- Nicole M Kettner
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
| | - Smruthi Vijayaraghavan
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Merih Guray Durak
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Tuyen Bui
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Mehrnoosh Kohansal
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Min Jin Ha
- Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Bin Liu
- Department of Human Genetics, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Xiayu Rao
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Jing Wang
- Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Min Yi
- Department of Breast Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Jason P W Carey
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Xian Chen
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - T Kris Eckols
- Department of Infectious Diseases, Infection Control & Employee Health, Division of Internal Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Akshara S Raghavendra
- Department of Breast Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Nuhad K Ibrahim
- Department of Breast Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Meghan Sri Karuturi
- Department of Breast Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Stephanie S Watowich
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Aysegul Sahin
- Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - David J Tweardy
- Department of Infectious Diseases, Infection Control & Employee Health, Division of Internal Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas
- Department of Molecular & Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Kelly K Hunt
- Department of Breast Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Debu Tripathy
- Department of Breast Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Khandan Keyomarsi
- Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
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Tischkau SA. Mechanisms of circadian clock interactions with aryl hydrocarbon receptor signalling. Eur J Neurosci 2019; 51:379-395. [DOI: 10.1111/ejn.14361] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 01/17/2019] [Accepted: 01/23/2019] [Indexed: 12/29/2022]
Affiliation(s)
- Shelley A. Tischkau
- Department of PharmacologySouthern Illinois University School of Medicine Springfield Illinois
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Tarnow P, Tralau T, Luch A. Chemical activation of estrogen and aryl hydrocarbon receptor signaling pathways and their interaction in toxicology and metabolism. Expert Opin Drug Metab Toxicol 2019; 15:219-229. [PMID: 30644759 DOI: 10.1080/17425255.2019.1569627] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
INTRODUCTION Estrogen receptors (ERs) and the arylhydrocarbon receptor (AHR) are ligand-activated transcription factors that regulate the expression of genes involved in many physiological processes. With both receptors binding a broad range of natural and anthropogenic ligands, they are molecular targets for many substances, raising concerns for possible health effects. Areas covered: This review shall give a brief overview on the physiological functions of both receptors including their underlying molecular mechanisms. It summarizes the interaction of the respective signaling pathways including impacts on metabolism of endogenous estrogens, transcriptional interference, inhibitory crosstalk, and proteasomal degradation. Also addressed are the AHR dependent formation of estrogenic metabolites from polycyclic aromatic hydrocarbons and the possible impact of the ER/AHR crosstalk in the context of drug metabolism. Expert opinion: Despite decade-long research, the physiological role of the AHR and ER as well as the implications of their complex mutual crosstalk remain to be determined as do resulting potential impacts on human health. With more and more endogenous AHR ligands being discovered, future research should hence systematically address the potential impact of such substances on estrogen signaling. The intimate link between these two pathways and the genes regulated therein bears the potential for impacts on drug metabolism and human health.
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Affiliation(s)
- Patrick Tarnow
- a Department of Chemical & Product Safety , German Federal Institute for Risk Assessment (BfR) , Berlin , Germany
| | - Tewes Tralau
- a Department of Chemical & Product Safety , German Federal Institute for Risk Assessment (BfR) , Berlin , Germany
| | - Andreas Luch
- a Department of Chemical & Product Safety , German Federal Institute for Risk Assessment (BfR) , Berlin , Germany
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28
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Asprodini E, Tsiokou V, Begas E, Kilindris T, Kouvaras E, Samara M, Messinis I. Alterations in Xenobiotic-Metabolizing Enzyme Activities across Menstrual Cycle in Healthy Volunteers. J Pharmacol Exp Ther 2018; 368:262-271. [PMID: 30591530 DOI: 10.1124/jpet.118.254284] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 12/06/2018] [Indexed: 11/22/2022] Open
Abstract
The purpose of the study was to determine whether the in vivo activities of drug-metabolizing enzymes CYP1A2 and CYP2A6, xanthine oxidase (XO), and N-acetyltransferase-2 (NAT2) vary across the menstrual cycle. Forty-two healthy women were studied at early follicular phase (EFP: 2nd to 4th days), late follicular phase (LFP: 10th to 12th days), and luteal phase (LP: 19th to 25th days) of a single menstrual cycle, and blood and urine samples were collected at each phase. Spot urine samples obtained 6 hours following 200-mg caffeine administration were used to determine caffeine metabolite ratios (CMRs); blood samples were used to determine CYP1A2*1F (rs762551) and CYP1A2*1C (rs2069514) polymorphisms and the hormonal profile (estradiol, progesterone, and luteinizing and follicle-stimulating hormones) at EFP, LFP, and LP. CMR and hormone variations were analyzed at three levels (EFP, LFP, LP) using one-way repeated-measures analysis of variance. CYP1A2 activity was lower and that of CYP2A6 and NAT2 were higher at LFP compared with EFP and LP. Enzyme alterations were significant in volunteers (n = 21) whose hormonal profiles at EFP, LFP, and LP corresponded to expected levels, but not in volunteers (n = 15) with presumed early or late sampling around LFP. No significant difference was detected in any enzyme activity in presumed anovulatory volunteers (n = 6). The reduction of CYP1A2 activity at LFP was not associated with smoking or CYP1A2*1F polymorphism. XO and NAT2 (fast acetylators) activities remained unaltered. It is suggested that drug-metabolizing enzyme activities are altered across the menstrual cycle. Selection of appropriate sampling periods verified by hormonal assessment and identification of anovulatory cycles are decisive factors in disclosing altered enzyme activity across the menstrual cycle.
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Affiliation(s)
- E Asprodini
- Laboratory of Pharmacology (E.A., V.T., E.B., E.K.), Medical Informatics (T.K.), Pathology (M.S.), and Department of Obstetrics and Gynecology (I.M.), Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - V Tsiokou
- Laboratory of Pharmacology (E.A., V.T., E.B., E.K.), Medical Informatics (T.K.), Pathology (M.S.), and Department of Obstetrics and Gynecology (I.M.), Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - E Begas
- Laboratory of Pharmacology (E.A., V.T., E.B., E.K.), Medical Informatics (T.K.), Pathology (M.S.), and Department of Obstetrics and Gynecology (I.M.), Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - T Kilindris
- Laboratory of Pharmacology (E.A., V.T., E.B., E.K.), Medical Informatics (T.K.), Pathology (M.S.), and Department of Obstetrics and Gynecology (I.M.), Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - E Kouvaras
- Laboratory of Pharmacology (E.A., V.T., E.B., E.K.), Medical Informatics (T.K.), Pathology (M.S.), and Department of Obstetrics and Gynecology (I.M.), Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - M Samara
- Laboratory of Pharmacology (E.A., V.T., E.B., E.K.), Medical Informatics (T.K.), Pathology (M.S.), and Department of Obstetrics and Gynecology (I.M.), Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - I Messinis
- Laboratory of Pharmacology (E.A., V.T., E.B., E.K.), Medical Informatics (T.K.), Pathology (M.S.), and Department of Obstetrics and Gynecology (I.M.), Faculty of Medicine, School of Health Sciences, University of Thessaly, Larissa, Greece
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29
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Vondráček J, Pivnička J, Machala M. Polycyclic aromatic hydrocarbons and disruption of steroid signaling. CURRENT OPINION IN TOXICOLOGY 2018. [DOI: 10.1016/j.cotox.2018.12.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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30
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Pilsner JR, Shershebnev A, Medvedeva YA, Suvorov A, Wu H, Goltsov A, Loukianov E, Andreeva T, Gusev F, Manakhov A, Smigulina L, Logacheva M, Shtratnikova V, Kuznetsova I, Speranskiy-Podobed P, Burns JS, Williams PL, Korrick S, Lee MM, Rogaev E, Hauser R, Sergeyev O. Peripubertal serum dioxin concentrations and subsequent sperm methylome profiles of young Russian adults. Reprod Toxicol 2018; 78:40-49. [PMID: 29550351 PMCID: PMC6130911 DOI: 10.1016/j.reprotox.2018.03.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Revised: 03/04/2018] [Accepted: 03/13/2018] [Indexed: 01/22/2023]
Abstract
BACKGROUND The association of exposure to endocrine disrupting chemicals in the peripubertal period with subsequent sperm DNA methylation is unknown. OBJECTIVE We examined the association of peripubertal serum 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) concentrations with whole-genome bisulfite sequencing (WGBS) of sperm collected in young adulthood. METHODS The Russian Children's Study is a prospective cohort of 516 boys who were enrolled at 8-9 years of age and provided semen samples at 18-19 years of age. WGBS of sperm was conducted to identify differentially methylated regions (DMR) between highest (n = 4) and lowest (n = 4) peripubertal TCDD groups. RESULTS We found 52 DMRs that distinguished lowest and highest peripubertal serum TCDD concentrations. One of the top scoring networks, "Cellular Assembly and Organization, Cellular Function and Maintenance, Carbohydrate Metabolism", identified estrogen receptor alpha as its central regulator. CONCLUSION Findings from our limited sample size suggest that peripubertal environmental exposures are associated with sperm DNA methylation in young adults.
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Affiliation(s)
- J Richard Pilsner
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts, 686 North Pleasant Street, Amherst, MA, 01003, USA.
| | - Alex Shershebnev
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts, 686 North Pleasant Street, Amherst, MA, 01003, USA.
| | - Yulia A Medvedeva
- Institute of Bioengineering, Research Center of Biotechnology Russian Academy of Sciences, 60 let Oktjabrja pr-t, 7, Bld. 1, 117312, Moscow, Russia; Department of Computational Biology, Vavilov Institute of General Genetics, Russian Academy of Sciences, 3 Gubkina St., 119991, Moscow, Russia.
| | - Alexander Suvorov
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts, 686 North Pleasant Street, Amherst, MA, 01003, USA.
| | - Haotian Wu
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts, 686 North Pleasant Street, Amherst, MA, 01003, USA.
| | - Andrey Goltsov
- Department of Molecular Genetics, Research Center for Obstetrics, Gynecology and Perinatology, 4 Oparin St., 117997, Moscow, Russia; Department of Genomics and Human Genetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, 3 Gubkina St., 119991, Moscow, Russia.
| | - Evgeny Loukianov
- Department of Genomics and Human Genetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, 3 Gubkina St., 119991, Moscow, Russia.
| | - Tatiana Andreeva
- Department of Genomics and Human Genetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, 3 Gubkina St., 119991, Moscow, Russia.
| | - Fedor Gusev
- Department of Genomics and Human Genetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, 3 Gubkina St., 119991, Moscow, Russia.
| | - Andrey Manakhov
- Department of Genomics and Human Genetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, 3 Gubkina St., 119991, Moscow, Russia.
| | - Luidmila Smigulina
- Chapaevsk Medical Association, 3a Meditsinskaya st., 446100, Chapaevsk, Samara region, Russia.
| | - Maria Logacheva
- A.N. Belozersky Research Institute of Physico-Chemical Biology, Moscow State University, Leninskye Gory, House 1, Building 40, 119992, Moscow, Russia; Center for Data-Intensive Biomedicine and Biotechnology, Skolkovo Institute of Science and Technology, 143028, Moscow, Russia.
| | - Victoria Shtratnikova
- A.N. Belozersky Research Institute of Physico-Chemical Biology, Moscow State University, Leninskye Gory, House 1, Building 40, 119992, Moscow, Russia; Center for Data-Intensive Biomedicine and Biotechnology, Skolkovo Institute of Science and Technology, 143028, Moscow, Russia.
| | - Irina Kuznetsova
- Department of Genomics and Human Genetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, 3 Gubkina St., 119991, Moscow, Russia.
| | - Peter Speranskiy-Podobed
- Department of Genomics and Human Genetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, 3 Gubkina St., 119991, Moscow, Russia.
| | - Jane S Burns
- Environmental and Occupational Medicine and Epidemiology Program, Department of Environmental Health, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Boston, MA, 02115, USA.
| | - Paige L Williams
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Boston, MA, 02115, USA; Department of Epidemiology, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Boston, MA, 02115, USA.
| | - Susan Korrick
- Environmental and Occupational Medicine and Epidemiology Program, Department of Environmental Health, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Boston, MA, 02115, USA; Channing Division of Network Medicine, Brigham and Women's Hospital, Harvard Medical School, 181 Longwood Avenue, Boston, MA, 02115, USA.
| | - Mary M Lee
- Pediatric Endocrine Division, Department of Pediatrics, University of Massachusetts Medical School, 55 N Lake Avenue, Worcester, MA, 01655, USA.
| | - Evgeny Rogaev
- Department of Genomics and Human Genetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, 3 Gubkina St., 119991, Moscow, Russia; Department of Psychiatry, Brudnick Neuropsychiatric Research Institute, University of Massachusetts Medical School, 303 Belmont Street, 01604 Worcester, MA, USA.
| | - Russ Hauser
- Environmental and Occupational Medicine and Epidemiology Program, Department of Environmental Health, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Boston, MA, 02115, USA; Department of Epidemiology, Harvard T.H. Chan School of Public Health, 665 Huntington Avenue, Boston, MA, 02115, USA.
| | - Oleg Sergeyev
- Department of Genomics and Human Genetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, 3 Gubkina St., 119991, Moscow, Russia; Chapaevsk Medical Association, 3a Meditsinskaya st., 446100, Chapaevsk, Samara region, Russia; A.N. Belozersky Research Institute of Physico-Chemical Biology, Moscow State University, Leninskye Gory, House 1, Building 40, 119992, Moscow, Russia.
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Towards Resolving the Pro- and Anti-Tumor Effects of the Aryl Hydrocarbon Receptor. Int J Mol Sci 2018; 19:ijms19051388. [PMID: 29735912 PMCID: PMC5983651 DOI: 10.3390/ijms19051388] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 04/27/2018] [Accepted: 04/30/2018] [Indexed: 12/11/2022] Open
Abstract
We have postulated that the aryl hydrocarbon receptor (AHR) drives the later, more lethal stages of some cancers when chronically activated by endogenous ligands. However, other studies have suggested that, under some circumstances, the AHR can oppose tumor aggression. Resolving this apparent contradiction is critical to the design of AHR-targeted cancer therapeutics. Molecular (siRNA, shRNA, AHR repressor, CRISPR-Cas9) and pharmacological (AHR inhibitors) approaches were used to confirm the hypothesis that AHR inhibition reduces human cancer cell invasion (irregular colony growth in 3D Matrigel cultures and Boyden chambers), migration (scratch wound assay) and metastasis (human cancer cell xenografts in zebrafish). Furthermore, these assays were used for a head-to-head comparison between AHR antagonists and agonists. AHR inhibition or knockdown/knockout consistently reduced human ER−/PR−/Her2− and inflammatory breast cancer cell invasion, migration, and metastasis. This was associated with a decrease in invasion-associated genes (e.g., Fibronectin, VCAM1, Thrombospondin, MMP1) and an increase in CDH1/E-cadherin, previously associated with decreased tumor aggression. Paradoxically, AHR agonists (2,3,7,8-tetrachlorodibenzo-p-dioxin and/or 3,3′-diindolylmethane) similarly inhibited irregular colony formation in Matrigel and blocked metastasis in vivo but accelerated migration. These data demonstrate the complexity of modulating AHR activity in cancer while suggesting that AHR inhibitors, and, under some circumstances, AHR agonists, may be useful as cancer therapeutics.
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Hoydal KS, Jenssen BM, Letcher RJ, Dam M, Arukwe A. Hepatic phase I and II biotransformation responses and contaminant exposure in long-finned pilot whales from the Northeastern Atlantic. MARINE ENVIRONMENTAL RESEARCH 2018; 134:44-54. [PMID: 29290385 DOI: 10.1016/j.marenvres.2017.12.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 12/14/2017] [Accepted: 12/16/2017] [Indexed: 06/07/2023]
Abstract
Faroe Island pilot whales have been documented to have high body burdens of organohalogen contaminants (OHCs), including polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs), but low burdens of their respective hydroxylated metabolites (OH-PCBs and OH-PBDEs). The present study investigated the hepatic expression and/or catalytic activities of phase I and II biotransformation enzymes in relation to hepatic concentrations of target OHCs, including OH-PCBs and OH-PBDEs, in long-finned pilot whales (Globicephala melas) from the Northeastern Atlantic. CYP1A, 2B, 2E and 3A protein expressions were identified in juveniles and adult males, but not in adult females. Ethoxyresorufin-O-deethylase (EROD) activity was significantly lower in adult females than in juveniles and adult males. Using multivariate analyses to investigate relationships between biological responses and OHC concentrations, a positive relationship was identified between EROD and OHCs. The activity levels of phase II conjugating enzymes (uridine 5'-diphospho-glucuronosyltransferase [UDPGT], and glutathione S-transferase [GST]) were low. The analyses of mRNA expression did not show correlative relationships with OHC concentrations, but cyp1a and ahr transcripts were positively correlated with EROD activity. We suggest that the low concentrations of OH-PCBs and OH-PBDEs reported in pilot whales is probably due to the identified low phase I biotransformation activities in the species.
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Affiliation(s)
- Katrin S Hoydal
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway; Environment Agency, Traðagøta 38, FO-165, Argir, Faroe Islands.
| | - Bjørn M Jenssen
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Robert J Letcher
- Ecotoxicology and Wildlife Health Division, Environment and Climate Change Canada, National Wildlife Research Centre, 1125 Colonel By Dr. (Raven Road), Carleton University, Ottawa, K1A 0H3, Canada
| | - Maria Dam
- Environment Agency, Traðagøta 38, FO-165, Argir, Faroe Islands
| | - Augustine Arukwe
- Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway
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Beischlag TV, Prefontaine GG, Hankinson O. ChIP-re-ChIP: Co-occupancy Analysis by Sequential Chromatin Immunoprecipitation. Methods Mol Biol 2018; 1689:103-112. [PMID: 29027168 DOI: 10.1007/978-1-4939-7380-4_9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Chromatin immunoprecipitation (ChIP) exploits the specific interactions between DNA and DNA-associated proteins. It can be used to examine a wide range of experimental parameters. A number of proteins bound at the same genomic location can identify a multi-protein chromatin complex where several proteins work together to regulate gene transcription or chromatin configuration. In many instances, this can be achieved using sequential ChIP; or simply, ChIP-re-ChIP. Whether it is for the examination of specific transcriptional or epigenetic regulators, or for the identification of cistromes, the ability to perform a sequential ChIP adds a higher level of power and definition to these analyses. In this chapter, we describe a simple and reliable method for the sequential ChIP assay.
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Affiliation(s)
- Timothy V Beischlag
- Faculty of Health Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada, V5A 1S6.
| | - Gratien G Prefontaine
- Faculty of Health Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada, V5A 1S6
| | - Oliver Hankinson
- Department of Pathology and Laboratory Medicine, University of California, Los Angeles, Los Angeles, CA, USA
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Taft JD, Colonnetta MM, Schafer RE, Plick N, Powell WH. Dioxin Exposure Alters Molecular and Morphological Responses to Thyroid Hormone in Xenopus laevis Cultured Cells and Prometamorphic Tadpoles. Toxicol Sci 2018; 161:196-206. [PMID: 29294139 PMCID: PMC5837452 DOI: 10.1093/toxsci/kfx213] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Amphibian metamorphosis is driven by thyroid hormone (TH). We used prometamorphic tadpoles and a cell line of the African clawed frog (Xenopus laevis) to examine immediate effects of dioxin exposure on TH. Gene expression patterns suggest cross-talk between the thyroid hormone receptor (TR) and aryl hydrocarbon receptor (AHR) signaling pathways. In XLK-WG cells, expression of Cytochrome P450 1A6 (cyp1A6), an AHR target, was induced 1000-fold by 100 nM TCDD (2, 3, 7, 8 tetrachlorodibenzo-p-dioxin). Krüppel-Like Factor 9 (klf9), the first gene induced in a cascade of TH responses tied to metamorphosis, was upregulated over 5-fold by 50 nM triiodothyronine (T3) and 2-fold by dioxin. Co-exposure to T3 and TCDD boosted both responses, further inducing cyp1A6 by 75% and klf9 about 60%. Additional canonical targets of each receptor, including trβa and trβb (TR) and udpgt1a (AHR) responded similarly. Induction of TH targets by TCDD in XLK-WG cells predicts that exposure could speed metamorphosis. We tested this hypothesis in two remodeling events: tail resorption and hind limb growth. Resorption of ex vivo cultured tails was accelerated by 10 nM T3, while a modest increase in resorption by 100 nM TCDD lacked statistical significance. Hind limbs doubled in length over four days following 1 nM T3 treatment, but limb length was unaffected by 100 nM TCDD. TCDD co-exposure reduced the T3 effect by nearly 40%, despite TCDD induction of klf9 in whole tadpoles, alone or with T3. These results suggest that tissue-specific TCDD effects limit or reverse the increased metamorphosis rate predicted by klf9 induction.
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Affiliation(s)
- Justin D Taft
- Biology Department, Kenyon College, Gambier, Ohio 43022
| | | | | | - Natalie Plick
- Biology Department, Kenyon College, Gambier, Ohio 43022
| | - Wade H Powell
- Biology Department, Kenyon College, Gambier, Ohio 43022
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Ligand-mediated cytoplasmic retention of the Ah receptor inhibits macrophage-mediated acute inflammatory responses. J Transl Med 2017; 97:1471-1487. [PMID: 28892097 PMCID: PMC5711556 DOI: 10.1038/labinvest.2017.92] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Revised: 07/12/2017] [Accepted: 07/18/2017] [Indexed: 12/25/2022] Open
Abstract
The Ah receptor (AHR) has been shown to exhibit both inflammatory and anti-inflammatory activity in a context-specific manner. In vivo macrophage-driven acute inflammation models were utilized here to test whether the selective Ah receptor modulator 1-allyl-7-trifluoromethyl-1H-indazol-3-yl]-4-methoxyphenol (SGA360) would reduce inflammation. Exposure to SGA360 was capable of significantly inhibiting lipopolysaccharide (LPS)-mediated endotoxic shock in a mouse model, both in terms of lethality and attenuating inflammatory signaling in tissues. Topical exposure to SGA360 was also able to mitigate joint edema in a monosodium urate (MSU) crystal gout mouse model. Inhibition was dependent on the expression of the high-affinity allelic AHR variant in both acute inflammation models. Upon peritoneal MSU crystal exposure SGA360 pretreatment inhibited neutrophil and macrophage migration into the peritoneum. RNA-seq analysis revealed that SGA360 attenuated the expression of numerous inflammatory genes and genes known to be directly regulated by AHR in thioglycolate-elicited primary peritoneal macrophages treated with LPS. In addition, expression of the high-affinity allelic AHR variant in cultured macrophages was necessary for SGA360-mediated repression of inflammatory gene expression. Mechanistic studies revealed that SGA360 failed to induce nuclear translocation of the AHR and actually enhanced cytoplasmic localization. LPS treatment of macrophages enhanced the occupancy of the AHR and p65 to the Ptgs2 promoter, whereas SGA360 attenuated occupancy. AHR ligand activity was detected in peritoneal exudates isolated from MSU-treated mice, thus suggesting that the anti-inflammatory activity of SGA360 is mediated at least in part through AHR antagonism of endogenous agonist activity. These results underscore an important role of the AHR in participating in acute inflammatory signaling and warrants further investigations into possible clinical applications.
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36
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Dunlap TL, Howell CE, Mukand N, Chen SN, Pauli GF, Dietz BM, Bolton JL. Red Clover Aryl Hydrocarbon Receptor (AhR) and Estrogen Receptor (ER) Agonists Enhance Genotoxic Estrogen Metabolism. Chem Res Toxicol 2017; 30:2084-2092. [PMID: 28985473 PMCID: PMC5698877 DOI: 10.1021/acs.chemrestox.7b00237] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
![]()
Many
women consider botanical dietary supplements (BDSs) as safe
alternatives to hormone therapy for menopausal symptoms. However,
the effect of BDSs on breast cancer risk is largely unknown. In the
estrogen chemical carcinogenesis pathway, P450 1B1 metabolizes estrogens
to 4-hydroxylated catechols, which are oxidized to genotoxic quinones
that initiate and promote breast cancer. In contrast, P450 1A1 catalyzed
2-hydroxylation represents a detoxification pathway. The current study
evaluated the effects of red clover, a popular BDS used for women’s
health, and its isoflavones, biochanin A (BA), formononetin (FN),
genistein (GN), and daidzein (DZ), on estrogen metabolism. The methoxy
estrogen metabolites (2-MeOE1, 4-MeOE1) were
measured by LC-MS/MS, and CYP1A1 and CYP1B1 gene expression was analyzed
by qPCR. Nonmalignant ER-negative breast epithelial cells (MCF-10A)
and ER-positive breast cancer cells (MCF-7) were derived from normal
breast epithelial tissue and ER+ breast cancer tissue. Red clover
extract (RCE, 10 μg/mL) and isoflavones had no effect on estrogen
metabolism in MCF-10A cells. However, in MCF-7 cells, RCE treatments
downregulated CYP1A1 expression and enhanced genotoxic metabolism
(4-MeOE1/CYP1B1 > 2-MeOE1/CYP1A1). Experiments
with the isoflavones showed that the AhR agonists (BA, FN) preferentially
induced CYP1B1 expression as well as 4-MeOE1. In contrast,
the ER agonists (GN, DZ) downregulated CYP1A1 expression likely through
an epigenetic mechanism. Finally, the ER antagonist ICI 182,780 potentiated
isoflavone-induced XRE-luciferase reporter activity and reversed GN
and DZ induced downregulation of CYP1A1 expression. Overall, these
studies show that red clover and its isoflavones have differential
effects on estrogen metabolism in “normal” vs breast
cancer cells. In breast cancer cells, the AhR agonists stimulate genotoxic
metabolism, and the ER agonists downregulate the detoxification pathway.
These data may suggest that especially breast cancer patients should
avoid red clover and isoflavone based BDSs when making choices for
menopausal symptom relief.
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Affiliation(s)
- Tareisha L Dunlap
- UIC/NIH Center for Botanical Dietary Supplements Research, Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Caitlin E Howell
- UIC/NIH Center for Botanical Dietary Supplements Research, Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Nita Mukand
- UIC/NIH Center for Botanical Dietary Supplements Research, Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Shao-Nong Chen
- UIC/NIH Center for Botanical Dietary Supplements Research, Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Guido F Pauli
- UIC/NIH Center for Botanical Dietary Supplements Research, Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Birgit M Dietz
- UIC/NIH Center for Botanical Dietary Supplements Research, Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
| | - Judy L Bolton
- UIC/NIH Center for Botanical Dietary Supplements Research, Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , 833 S. Wood Street, Chicago, Illinois 60612-7231, United States
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Fortunati N, Guaraldi F, Zunino V, Penner F, D'Angelo V, Zenga F, Pecori Giraldi F, Catalano MG, Arvat E. Effects of environmental pollutants on signaling pathways in rat pituitary GH3 adenoma cells. ENVIRONMENTAL RESEARCH 2017; 158:660-668. [PMID: 28732322 DOI: 10.1016/j.envres.2017.07.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 05/26/2017] [Accepted: 07/06/2017] [Indexed: 06/07/2023]
Abstract
An increased rate of acromegaly was reported in industrialized areas, suggesting an involvement of environmental pollutants in the pathogenesis and behavior of GH-secreting pituitary adenomas. Based on these premises, the aim of the study was to evaluate the effects of some widely diffused pollutants (i.e. benzene, BZ; bis(2-ethylhexyl) phthalate, DEHP and polychlorinated biphenyls, PCB) on growth hormone secretion, the somatostatin and estrogenic pathways, viability and proliferation of rat GH-producing pituitary adenoma (GH3) cells. All the pollutants induced a statistically significant increase in GH secretion and interfered with cell signaling. They all modulated the expression of SSTR2 and ZAC1, involved in the somatostatin signaling, and the expression of the transcription factor FOXA1, involved in the estrogen receptor signaling. Moreover, all the pollutants increased the expression of the CYP1A1, suggesting AHR pathway activation. None of the pollutants impacted on cell proliferation or viability. Present data demonstrate that exposure to different pollutants, used at in vivo relevant concentrations, plays an important role in the behavior of GH3 pituitary adenoma cells, by increasing GH secretion and modulating several cellular signaling pathways. These observations support a possible influence of different pollutants in vivo on the GH-adenoma aggressiveness and biological behavior.
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Affiliation(s)
- Nicoletta Fortunati
- Division of Oncological Endocrinology, Città della Salute e della Scienza University Hospital, I-10126 Turin, Italy
| | - Federica Guaraldi
- Division of Endocrinology, Diabetes and Metabolism, Department of Medical Sciences, Città della Salute e della Scienza University Hospital, I-10126 Turin, Italy
| | - Valentina Zunino
- Division of Oncological Endocrinology, Città della Salute e della Scienza University Hospital, I-10126 Turin, Italy
| | - Federica Penner
- Division of Neurosurgery, Città della Salute e della Scienza University Hospital, I-10126 Turin, Italy
| | - Valentina D'Angelo
- Division of Oncological Endocrinology, Città della Salute e della Scienza University Hospital, I-10126 Turin, Italy
| | - Francesco Zenga
- Division of Neurosurgery, Città della Salute e della Scienza University Hospital, I-10126 Turin, Italy
| | - Francesca Pecori Giraldi
- Neuroendocrinology Research Laboratory, Istituto Auxologico Italiano IRCCS, Cusano Milanino, (MI), Italy and Department of Clinical Sciences and Community Health, University of Milan, I-20149 Milan, Italy
| | | | - Emanuela Arvat
- Division of Oncological Endocrinology, Città della Salute e della Scienza University Hospital, I-10126 Turin, Italy; Department of Medical Sciences, University of Turin, I-10126 Turin, Italy.
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38
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Pregnane X receptor regulates the AhR/Cyp1A1 pathway and protects liver cells from benzo-[α]-pyrene-induced DNA damage. Toxicol Lett 2017; 275:67-76. [PMID: 28428138 DOI: 10.1016/j.toxlet.2017.03.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 03/08/2017] [Accepted: 03/29/2017] [Indexed: 11/20/2022]
Abstract
Pregnane X receptor (PXR) plays an important role in protecting cells from mutagenic DNA damages induced by endogenous and exogenous toxicants. This protective function is often attributed to the PXR-regulated metabolic detoxification. Here we report a novel potential mechanism that PXR reduces benzo-[α]-pyrene(BaP)-induced DNA damage through inhibiting the transcriptional activity of aryl hydrocarbon receptor (AhR) which plays a pivotal role in the bioactivation of BaP. We have utilized three well-characterized cell lines, i.e. Hepa1c1c7, AhR +/+; Bpr lacks AhR obligatory partner ARNT; Tao, lacks AhR, to analyze pivotal role of AhR/ARNT complex in mediating the BaP-induced DNA damages using comet assay (single-cell gel electrophoresis). We found that PXR activation could significantly inhibit BaP-induced DNA damage in the HepG2 cells as well as mouse hepatocytes. Using PXR-null and wild type mouse hepatocytes we showed that PXR activation by pregnenolone 16α-carbonitrile (PCN) significantly inhibited BaP-induced DNA damage and this protective effect was abolished in PXR-null hepatocytes. Mechanistically, PXR activation inhibited expression of AhR-target genes for CYP1A1, CYP1B1 and CYP1A2 that are required for BaP biotransformation in cultured liver cells, or in the livers of C57BL/6J mice. Using an AhR-responsive reporter assay as well as chromatin immunoprecipitation assay we found that PXR activation transcriptionally represses AhR-regulated gene expression. Furthermore, we found that PXR directly bound AhR at its DNA-binding domain, and this association may play a role in preventing of the AhR from binding to its target genes as shown in the ChIP assay. Taken together, our study has revealed a novel mechanism by which PXR protects liver cells from BaP-induced DNA damage through inhibiting the BaP biotransformation.
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Abstract
Why the interest in dioxins, a group of structurally related chemicals which have a common mechanism of action, a common spectrum of biological responses and are environmentally and biologically persistent? A plethora of effects have been reported in people, wildlife, and domestic animals since chloracne was first described in 1899. Cattle, horses, sheep, and chickens have all been shown to be affected during poisoning episodes with polychlorinated byphenyls (PCBs). Fish, birds, and marine mammals have shown adverse outcomes, such as loss of reproduction and immune suppression, at environmental levels. And in the laboratory, species from all vertebrate classes have been used to study the biological effects from exposure to dioxins [1]. While chloracne is diagnostic of poisoning by dioxins, it is only associated with high levels of exposure. However, industrial accidents such as in Nitro, West Virginia, in 1949, Seveso, Italy in 1976, the polybrominated biphenyl (PBB) flame retardant poisoning in Michigan in 1973, and the Binghamton office building fire in 1981, all resulted in some chloracne. In addition, other human poisonings, such as that due to PCB/polychorinated dibenzofuran (PCDF) contaminated rice oil in Japan in 1968 ("Yusho") and Taiwan in 1979 ("Yucheng"), demonstrated a wide range of toxic effects, both on those who ingested the contaminated oil and on their children born afterwards. Intentional poisoning by 2,3,7,8-tetrachloridibenzo-p-dioxin (TCDD), the most toxic polychlorinated dibenzo-p-dioxin (PCDD) congener, occurred to five people in Vienna in 1999, and to the Ukrainian President in 2004 [2].
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Affiliation(s)
- Linda S Birnbaum
- Director, National Institute of Environmental Health Sciences, NIH and Director, National Toxicology Program, DHHS, Research Triangle Park, NC 27709
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40
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Xue Z, Li D, Yu W, Zhang Q, Hou X, He Y, Kou X. Mechanisms and therapeutic prospects of polyphenols as modulators of the aryl hydrocarbon receptor. Food Funct 2017; 8:1414-1437. [DOI: 10.1039/c6fo01810f] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Polyphenolic AhR modulators displayed concentration-, XRE-, gene-, species- and cell-specific agonistic/antagonistic activity.
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Affiliation(s)
- Zhaohui Xue
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Dan Li
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Wancong Yu
- Medical Plant Laboratory
- Tianjin Research Center of Agricultural Biotechnology
- Tianjin 3000381
- China
| | - Qian Zhang
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Xiaonan Hou
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Yulong He
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Xiaohong Kou
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
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41
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Gong P, Madak-Erdogan Z, Flaws JA, Shapiro DJ, Katzenellenbogen JA, Katzenellenbogen BS. Estrogen receptor-α and aryl hydrocarbon receptor involvement in the actions of botanical estrogens in target cells. Mol Cell Endocrinol 2016; 437:190-200. [PMID: 27543265 PMCID: PMC5873581 DOI: 10.1016/j.mce.2016.08.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 07/15/2016] [Accepted: 08/14/2016] [Indexed: 11/19/2022]
Abstract
Botanical estrogen (BE) dietary supplements are consumed by women as substitutes for loss of endogenous estrogens at menopause. To examine the roles of estrogen receptor α (ERα) and aryl hydrocarbon receptor (AhR) and their crosstalk in the actions of BEs, we studied gene regulation and proliferation responses to four widely used BEs, genistein, daidzein, and S-equol from soy, and liquiritigen from licorice root in breast cancer and liver cells. BEs and estradiol (E2), acting through ERα, stimulated proliferation, ERα chromatin binding and target-gene expression. BEs but not E2, acting through AhR, bound to xenobiotic response element-containing chromatin sites and enhanced AhR target-gene expression (CYP1A1, CYP1B1). While E2 and TCDD acted quite selectively through their respective receptors, BEs acted via both receptors, with their AhR activity moderated by negative crosstalk through ERα. Both ERα and AhR should be considered as mediators of the biology and pharmacology of BEs.
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Affiliation(s)
- Ping Gong
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Zeynep Madak-Erdogan
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Jodi A Flaws
- Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - David J Shapiro
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | | | - Benita S Katzenellenbogen
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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42
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Oka K, Kohno S, Ohta Y, Guillette LJ, Iguchi T, Katsu Y. Molecular cloning and characterization of the aryl hydrocarbon receptors and aryl hydrocarbon receptor nuclear translocators in the American alligator. Gen Comp Endocrinol 2016; 238:13-22. [PMID: 27174749 DOI: 10.1016/j.ygcen.2016.05.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 04/27/2016] [Accepted: 05/06/2016] [Indexed: 11/22/2022]
Abstract
Aryl hydrocarbon receptor (AHR), a ligand-activated transcription factor, binds to a variety of chemical compounds including various environmental contaminants such as 2,3,7,8-tetrachlorodibenzo-p-dioxin. This receptor regulates expression of target genes through dimerization with the AHR nuclear translocator (ARNT). Since AHR-ARNT signaling pathways differ among species, characterization of AHR and ARNT is important to assess the effects of environmental contamination and for understanding the molecular mechanism underlying the intrinsic function. In this study, we isolated the cDNAs encoding three types of AHR and two types of ARNT from a reptile, the American alligator (Alligator mississippiensis). In vitro reporter gene assays showed that all complexes of alligator AHR-ARNT were able to activate ligand-dependent transcription on a xenobiotic response element. We found that AHR-ARNT complexes had higher sensitivities to a ligand than AHR-ARNT2 complexes. Alligator AHR1B showed the highest sensitivity in transcriptional activation induced by indigo when compared with AHR1A and AHR2. Taken together, our data revealed that all three alligator AHRs and two ARNTs were functional in the AHR signaling pathway with ligand-dependent and isoform-specific transactivations in vitro.
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Affiliation(s)
- Kaori Oka
- Graduate School of Life Science and Department of Biological Sciences, Hokkaido University, Sapporo, Japan
| | - Satomi Kohno
- Department of Obstetrics and Gynecology, and Marine Biomedicine and Environmental Science Center, Medical University of South Carolina, and Hollings Marine Laboratory, Charleston, SC, USA
| | - Yasuhiko Ohta
- Department of Veterinary Medicine, Faculty of Agriculture, Tottori University, Koyama, Tottori, Japan
| | - Louis J Guillette
- Department of Obstetrics and Gynecology, and Marine Biomedicine and Environmental Science Center, Medical University of South Carolina, and Hollings Marine Laboratory, Charleston, SC, USA
| | - Taisen Iguchi
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi, Japan
| | - Yoshinao Katsu
- Graduate School of Life Science and Department of Biological Sciences, Hokkaido University, Sapporo, Japan.
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43
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Developmental exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin may alter LH release patterns by abolishing sex differences in GABA/glutamate cell number and modifying the transcriptome of the male anteroventral periventricular nucleus. Neuroscience 2016; 329:239-53. [PMID: 27185484 DOI: 10.1016/j.neuroscience.2016.04.051] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 04/08/2016] [Accepted: 04/30/2016] [Indexed: 01/17/2023]
Abstract
Developmental exposure to arylhydrocarbon receptor (AhR) ligands abolishes sex differences in a wide range of neural structures and functions. A well-studied example is the anteroventral periventricular nucleus (AVPV), a structure that controls sex-specific luteinizing hormone (LH) release. In the male, testosterone (T) secreted by the developing testes defeminizes LH release mechanisms; conversely, perinatal AhR activation by 2,3,7,8,-tetrachlorodibenzo-p-dioxin (TCDD) blocks defeminization. To better understand developmental mechanisms altered by TCDD exposure, we first verified that neonatal TCDD exposure in male rats prevented the loss of AVPV GABA/glutamate neurons that are critical for female-typical LH surge release. We then used whole genome arrays and quantitative real-time polymerase chain reaction (QPCR) to compare AVPV transcriptomes of males treated neonatally with TCDD or vehicle. Our bioinformatics analyses showed that TCDD enriched gene sets important for neuron development, synaptic transmission, ion homeostasis, and cholesterol biosynthesis. In addition, upstream regulatory analysis suggests that both estrogen receptors (ER) and androgen receptors (AR) regulate genes targeted by TCDD. Of the 23 mRNAs found to be changed by TCDD at least 2-fold (p<0.05), most participate in the functions identified in our bioinformatics analyses. Several, including matrix metallopeptidase 9 and SRY-box 11 (Sox11), are known targets of E2. CUG triplet repeat, RNA binding protein 2 (cugbp2) is particularly interesting because it is sex-specific, oppositely regulated by estradiol (E2) and TCDD. Moreover, it regulates the post-transcriptional processing of molecules previously linked to sexual differentiation of the brain. These findings provide new insights into how TCDD may interfere with defeminization of LH release patterns.
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Helle J, Bader MI, Keiler AM, Zierau O, Vollmer G, Chittur SV, Tenniswood M, Kretzschmar G. Cross-Talk in the Female Rat Mammary Gland: Influence of Aryl Hydrocarbon Receptor on Estrogen Receptor Signaling. ENVIRONMENTAL HEALTH PERSPECTIVES 2016; 124:601-610. [PMID: 26372666 PMCID: PMC4858405 DOI: 10.1289/ehp.1509680] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 09/10/2015] [Indexed: 06/05/2023]
Abstract
BACKGROUND Cross-talk between the aryl hydrocarbon receptor (AHR) and the estrogen receptor (ER) plays a major role in signaling processes in female reproductive organs. OBJECTIVES We investigated the influence of the AHR ligand 3-methylcholanthrene (3-MC) on ER-mediated signaling in mammary gland tissue of ovariectomized (ovx) rats. METHODS After 14 days of hormonal decline, ovx rats were treated for 3 days with 4 μg/kg 17β-estradiol (E2), 15 mg/kg 8-prenylnaringenin (8-PN), 15 mg/kg 3-MC, or a combination of these compounds (E2 + 3-MC, 8-PN + 3-MC). Whole-mount preparations of the mammary gland were used to count terminal end buds (TEBs). Protein expression studies (immunohistochemistry, immunofluorescence), a cDNA microarray, pathway analyses, and quantitative real-time polymerase chain reaction (qPCR) were performed to evaluate the interaction between AHR- and ER-mediated signaling pathways. RESULTS E2 treatment increased the number of TEBs and the levels of Ki-67 protein and progesterone receptor (PR); this treatment also changed the expression of 325 genes by more than 1.5-fold. Although 3-MC treatment alone had marginal impact on gene or protein expression, when rats were co-treated with 3-MC and E2, 3-MC strongly inhibited E2-induced TEB development, protein synthesis, and the expression of nearly half of E2-induced genes. This inhibitory effect of 3-MC was partially mirrored when 8-PN was used as an ER ligand. The anti-estrogenicity of ligand-activated AHR was at least partly due to decreased protein levels of ERα in ductal epithelial cells. CONCLUSION Our data show transcriptome-wide anti-estrogenic properties of ligand-activated AHR on ER-mediated processes in the mammary gland, thereby contributing an explanation for the chemopreventive and endocrine-disrupting potential of AHR ligands. CITATION Helle J, Bader MI, Keiler AM, Zierau O, Vollmer G, Chittur SV, Tenniswood M, Kretzschmar G. 2016. Cross-talk in the female rat mammary gland: influence of aryl hydrocarbon receptor on estrogen receptor signaling. Environ Health Perspect 124:601-610; http://dx.doi.org/10.1289/ehp.1509680.
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Affiliation(s)
- Janina Helle
- Institute of Zoology, Molecular Cell Physiology and Endocrinology, Technische Universität Dresden, Dresden, Germany
| | - Manuela I. Bader
- Institute of Zoology, Molecular Cell Physiology and Endocrinology, Technische Universität Dresden, Dresden, Germany
| | - Annekathrin M. Keiler
- Institute of Zoology, Molecular Cell Physiology and Endocrinology, Technische Universität Dresden, Dresden, Germany
| | - Oliver Zierau
- Institute of Zoology, Molecular Cell Physiology and Endocrinology, Technische Universität Dresden, Dresden, Germany
| | - Günter Vollmer
- Institute of Zoology, Molecular Cell Physiology and Endocrinology, Technische Universität Dresden, Dresden, Germany
| | - Sridar V. Chittur
- Department of Biomedical Sciences, University at Albany, State University of New York, Albany, New York, USA
| | - Martin Tenniswood
- Department of Biomedical Sciences, University at Albany, State University of New York, Albany, New York, USA
| | - Georg Kretzschmar
- Institute of Zoology, Molecular Cell Physiology and Endocrinology, Technische Universität Dresden, Dresden, Germany
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Froyen EB, Steinberg FM. Genistein decreases basal hepatic cytochrome P450 1A1 protein expression and activity in Swiss Webster mice. Nutr Res 2016; 36:430-9. [PMID: 27101761 DOI: 10.1016/j.nutres.2016.01.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2015] [Revised: 12/29/2015] [Accepted: 01/06/2016] [Indexed: 01/20/2023]
Abstract
Soy consumption has been associated with risk reduction for chronic diseases such as cancer. One proposed mechanism for cancer prevention by soy is through decreasing cytochrome P450 1A1 (Cyp1a1) activity. However, it is not known with certainty which soy components modulate Cyp1a1, or the characteristics or mechanisms involved in the responses after short-term (<20 days) dietary treatment without concomitant carcinogen-mediated induction. Therefore, the objective was to test the hypothesis that physiologic concentrations of dietary genistein and/or daidzein will decrease basal hepatic Cyp1a1 protein expression and activity in male and female Swiss Webster mice via inhibiting the bindings of aryl hydrocarbon receptor (AhR)-AhR nuclear translocator (ARNT) and estrogen receptor-α to the Cyp1a1 promoter region xenobiotic response element. The mice were fed the AIN-93G diet supplemented with 1500 mg/kg of genistein or daidzein for up to 1 week. Genistein, but not daidzein, significantly decreased basal hepatic microsomal Cyp1a1 protein expression and activity. AhR protein expression was not altered. Molecular mechanisms were investigated in Hepa-1c1c7 cells treated with 5 μmol/L purified aglycones genistein, daidzein, or equol. Cells treated with genistein exhibited inhibitions in ARNT and estrogen receptor-α bindings to the Cyp1a1 promoter region. This study demonstrated that genistein consumption reduced constitutive hepatic Cyp1a1 protein expression and activity, thereby contributing to the understanding of how soy isoflavone aglycones modulate cytochrome P450 biotransformation enzymes.
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Affiliation(s)
- Erik B Froyen
- Department of Nutrition and Graduate Group in Nutritional Biology, University of California, Davis, Davis, CA 95616, USA
| | - Francene M Steinberg
- Department of Nutrition and Graduate Group in Nutritional Biology, University of California, Davis, Davis, CA 95616, USA.
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Tarnow P, Tralau T, Luch A. G protein-coupled receptor 30 ligand G-1 increases aryl hydrocarbon receptor signalling by inhibition of tubulin assembly and cell cycle arrest in human MCF-7 cells. Arch Toxicol 2015; 90:1939-48. [DOI: 10.1007/s00204-015-1615-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 10/01/2015] [Indexed: 11/30/2022]
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Andersson A, Grahnemo L, Engdahl C, Stubelius A, Lagerquist MK, Carlsten H, Islander U. IL-17-producing γδT cells are regulated by estrogen during development of experimental arthritis. Clin Immunol 2015; 161:324-32. [PMID: 26423309 DOI: 10.1016/j.clim.2015.09.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2015] [Revised: 09/18/2015] [Accepted: 09/25/2015] [Indexed: 01/29/2023]
Abstract
Interleukin-17 (IL-17) drives inflammation and destruction of joints in rheumatoid arthritis (RA). The female sex hormone 17β-estradiol (E2) inhibits experimental arthritis. γδT cells are significant producers of IL-17, thus the aim of this study was to investigate if E2 influenced IL-17(+) γδT cells during arthritis development using a variety of experimental RA models: collagen-induced arthritis (CIA); antigen-induced arthritis (AIA); and collagen antibody-induced arthritis (CAIA). We demonstrate that E2 treatment decreases IL-17(+) γδT cell number in joints, but increases IL-17(+) γδT cells in draining lymph nodes, suggesting an E2-mediated prevention of IL-17(+) γδT cell migration from lymph nodes to joints, in concert with our recently reported effects of E2 on Th17 cells (Andersson et al., 2015). E2 did neither influence the general γδT cell population nor IFNγ(+) γδT cells, implying a selective regulation of IL-17-producing cells. In conclusion, this study contributes to the understanding of estrogen's role in autoimmune disease.
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Affiliation(s)
- Annica Andersson
- Centre for Bone and Arthritis Research, Department of Rheumatology and Inflammation Research, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg, Sweden.
| | - Louise Grahnemo
- Centre for Bone and Arthritis Research, Department of Rheumatology and Inflammation Research, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg, Sweden.
| | - Cecilia Engdahl
- Centre for Bone and Arthritis Research, Department of Rheumatology and Inflammation Research, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg, Sweden; Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg, Sweden.
| | - Alexandra Stubelius
- Centre for Bone and Arthritis Research, Department of Rheumatology and Inflammation Research, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg, Sweden.
| | - Marie K Lagerquist
- Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg, Sweden.
| | - Hans Carlsten
- Centre for Bone and Arthritis Research, Department of Rheumatology and Inflammation Research, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg, Sweden.
| | - Ulrika Islander
- Centre for Bone and Arthritis Research, Department of Rheumatology and Inflammation Research, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg, Sweden.
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Go RE, Kim CW, Choi KC. Effect of fenhexamid and cyprodinil on the expression of cell cycle- and metastasis-related genes via an estrogen receptor-dependent pathway in cellular and xenografted ovarian cancer models. Toxicol Appl Pharmacol 2015; 289:48-57. [PMID: 26344002 DOI: 10.1016/j.taap.2015.09.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 09/01/2015] [Indexed: 12/22/2022]
Abstract
Fenhexamid and cyprodinil are antifungal agents (pesticides) used for agriculture, and are present at measurable amounts in fruits and vegetables. In the current study, the effects of fenhexamid and cyprodinil on cancer cell proliferation and metastasis were examined. Additionally, the protein expression levels of cyclin D1 and cyclin E as well as cathepsin D were analyzed in BG-1 ovarian cancer cells that express estrogen receptors (ERs). The cells were cultured with 0.1% dimethyl sulfoxide (DMSO; control), 17β-estradiol (E2; 10(-9)M), and fenhexamid or cyprodinil (10(-5)-10(-7)M). Results of a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay showed that fenhexamid and cyprodinil increased BG-1 cell proliferation about 1.5 to 2 times similar to E2 (5 times) compared to the control. When the cells were co-treated with ICI 182,780 (10(-8)M), an ER antagonist, the proliferation of pesticide-treated BG-1 cells was decreased to the level of the control. A wound healing assay revealed that the pesticides reduced the disrupted area in the BG-1 cell monolayer similar to E2. Protein levels of cyclin D1 and E as well as cathepsin D were increased by fenhexamid and cyprodinil. This effect was reversed by co-treatment with ICI 182,780. In a xenograft mouse model with transplanted BG-1 cells, cyprodinil significantly increased tumor mass formation about 2 times as did E2 (6 times) compared to the vehicle (0.1% DMSO) over an 80-day period. In contrast, fenhexamid did not promote ovarian tumor formation in this mouse model. Cyprodinil also induced cell proliferation along with the expression of proliferating cell nuclear antigen (PCNA) and cathepsin D in tumor tissues similar to E2. Taken together, these results imply that fenhexamid and cyprodinil may have disruptive effects on ER-expressing cancer by altering the cell cycle- and metastasis-related gene expression via an ER-dependent pathway.
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Affiliation(s)
- Ryeo-Eun Go
- Laboratory of Biochemistry and Immunology, College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea
| | - Cho-Won Kim
- Laboratory of Biochemistry and Immunology, College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea
| | - Kyung-Chul Choi
- Laboratory of Biochemistry and Immunology, College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea.
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Cao P, Feng F, Dong G, Yu C, Feng S, Song E, Shi G, Liang Y, Liang G. Estrogen receptor α enhances the transcriptional activity of ETS-1 and promotes the proliferation, migration and invasion of neuroblastoma cell in a ligand dependent manner. BMC Cancer 2015; 15:491. [PMID: 26122040 PMCID: PMC4486695 DOI: 10.1186/s12885-015-1495-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Accepted: 06/17/2015] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND It is well known that estrogen receptor α (ERα) participates in the pathogenic progress of breast cancer, hepatocellular carcinoma and head and neck squamous cell carcinoma. In neuroblastoma cells and related cancer clinical specimens, moreover, the ectopic expression of ERα has been identified. However, the detailed function of ERα in the proliferation of neuroblastoma cell is yet unclear. METHODS The transcriptional activity of ETS-1 (E26 transformation specific sequence 1) was measured by luciferase analysis. Western blot assays and Real-time RT-PCR were used to examine the expression of ERα, ETS-1 and its targeted genes. The protein-protein interaction between ERα and ETS-1 was determined by co-IP and GST-Pull down assays. The accumulation of ETS-1 in nuclear was detected by western blot assays, and the recruitment of ETS-1 to its targeted gene's promoter was tested by ChIP assays. Moreover, SH-SY5Y cells' proliferation, anchor-independent growth, migration and invasion were quantified using the MTT, soft agar or Trans-well assay, respectively. RESULTS The transcriptional activity of ETS-1 was significantly increased following estrogen treatment, and this effect was related to ligand-mediated activation of ERα. The interaction between the ERα and ETS-1 was identified, and enhancement of ERα activation would up-regulate the ETS-1 transcription factor activity via modulating its cytoplasm/nucleus translocation and the recruitment of ETS-1 to its target gene's promoter. Furthermore, treatment of estrogen increased proliferation, migration and invasion of neuroblastoma cells, whereas the antagonist of ERα reduced those effects. CONCLUSIONS In this study, we provided evidences that activation of ERα promoted neuroblastoma cells proliferation and up-regulated the transcriptional activity of ETS-1. By investigating the role of ERα in the ETS-1 activity regulation, we demonstrated that ERα may be a novel ETS-1 co-activator and thus a potential therapeutic target in human neuroblastoma treatment.
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Affiliation(s)
- Peng Cao
- Department of Neurosurgery, Institute of Neurology, General Hospital of Shenyang Military Area Command, Shenyang Northern Hospital, 83 Wenhua Road, Shenhe District, Shenyang City, Liaoning Province, 110016, PR China.
| | - Fan Feng
- Department of Pharmacy, General Hospital of Shenyang Military Area Command, Shenyang Northern Hospital, 83 Wenhua Road, Shenhe District, Shenyang City, Liaoning Province, 110016, PR China.
| | - Guofu Dong
- Institute of Radiation Medicine, Military Medical Science Academy of the Chinese PLA, 27 Taiping Road, Beijing City, 100850, PR China.
| | - Chunyong Yu
- Department of Neurosurgery, Institute of Neurology, General Hospital of Shenyang Military Area Command, Shenyang Northern Hospital, 83 Wenhua Road, Shenhe District, Shenyang City, Liaoning Province, 110016, PR China.
| | - Sizhe Feng
- Department of Neurosurgery, Institute of Neurology, General Hospital of Shenyang Military Area Command, Shenyang Northern Hospital, 83 Wenhua Road, Shenhe District, Shenyang City, Liaoning Province, 110016, PR China.
| | - Erlin Song
- Department of Urology, General Hospital of the Chinese PLA, 28 Fuxing Road, Beijing City, 100853, PR China. .,Key Laboratory of Cardiovascular Medicine Research, Ministry of Education, Harbin Medical University, Harbin, 150081, PR China.
| | - Guobing Shi
- Department of Pharmacy, General Hospital of Shenyang Military Area Command, Shenyang Northern Hospital, 83 Wenhua Road, Shenhe District, Shenyang City, Liaoning Province, 110016, PR China.
| | - Yong Liang
- Department of Neurosurgery, Institute of Neurology, General Hospital of Shenyang Military Area Command, Shenyang Northern Hospital, 83 Wenhua Road, Shenhe District, Shenyang City, Liaoning Province, 110016, PR China.
| | - Guobiao Liang
- Department of Neurosurgery, Institute of Neurology, General Hospital of Shenyang Military Area Command, Shenyang Northern Hospital, 83 Wenhua Road, Shenhe District, Shenyang City, Liaoning Province, 110016, PR China.
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Lee JY, Choi HY, Na WH, Ju BG, Yune TY. 17β-estradiol inhibits MMP-9 and SUR1/TrpM4 expression and activation and thereby attenuates BSCB disruption/hemorrhage after spinal cord injury in male rats. Endocrinology 2015; 156:1838-50. [PMID: 25763638 DOI: 10.1210/en.2014-1832] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Blood-spinal cord barrier (BSCB) disruption and progressive hemorrhage after spinal cord injury (SCI) lead to secondary injury and the subsequent apoptosis and/or necrosis of neuron and glia, causing permanent neurological deficits. In this study, we examined the effect of 17β-estradiol (E2) on BSCB breakdown and hemorrhage as well as subsequent inflammation after SCI. After a moderate contusion injury at the 9th thoracic segment of spinal cord, E2 (300 μg/kg) was administered by iv injection immediately after SCI, and the same dose of E2 was then administered 6 and 24 hours after injury. Our data show that E2 attenuated BSCB permeability and hemorrhage and reduced the infiltration of neutrophils and macorphages after SCI. Consistent with this finding, the expression of inflammatory mediators was significantly reduced by E2. Furthermore, E2 treatment significantly inhibited the expression of sulfonylurea receptor 1 and transient receptor potential melastatin 4 after injury, which are known to mediate hemorrhage at an early stage after SCI. Moreover, the expression and activation of matrix metalloprotease-9 after injury, which is known to disrupt BSCB, and the degradation of tight junction proteins, such as zona occludens-1 and occludin, were significantly inhibited by E2 treatment. Furthermore, the protective effects of E2 on BSCB disruption and functional improvement were abolished by an estrogen receptor antagonist, ICI 182780 (3 mg/kg). Thus, our study provides evidence that the neuroprotective effect of E2 after SCI is, in part, mediated by inhibiting BSCB disruption and hemorrhage through the down-regulation of sulfonylurea receptor 1/transient receptor potential melastatin 4 and matrix metalloprotease-9, which is dependent on estrogen receptor.
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Affiliation(s)
- Jee Y Lee
- Age-Related and Brain Diseases Research Center (J.Y.L., H.Y.C., T.Y.Y.) and Department of Biochemistry and Molecular Biology (T.Y.Y.), School of Medicine, Kyung Hee University, Seoul, 130-701, Korea; and Department of Life Science (W.H.N., B.G.J.), Sogang University, Seoul 121-742, Korea
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