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Alluli A, Fonseca G, Matthews J, Eidelman DH, Baglole CJ. Regulation of long non-coding RNA expression by aryl hydrocarbon receptor activation. Toxicol Lett 2024; 391:13-25. [PMID: 38036013 DOI: 10.1016/j.toxlet.2023.11.004] [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: 04/13/2023] [Revised: 10/27/2023] [Accepted: 11/13/2023] [Indexed: 12/02/2023]
Abstract
The aryl hydrocarbon receptor (AhR) is a cytosolic transcription factor that can be activated by endogenous or xenobiotic ligands. Upon activation, the AhR translocates to the nucleus, dimerizes with the AhR nuclear translator (ARNT), and binds to specific DNA sequences called xenobiotic response elements (XRE) to promote target gene transcription, including cytochrome P450 (e.g., CYP1A1) expression. In addition to mRNA, the AhR may also regulate long non-coding RNA (lncRNA) expression. lncRNA are transcripts more than 200 nucleotides in length that do not encode a protein. Herein, we tested whether AhR activation regulates the expression of lncRNA in response to benzo[a]pyrene (B[a]P) using RNA sequencing (RNA-seq). We found that many lncRNA (e.g., SATB1-AS1, MIR4290HG, AC008969.1, LINC01533, VIPR1-AS1) and protein-coding RNA (e.g., CYP1A1, BX005266.2, AQP3, BTG2, DCX, and AhRR) were differentially expressed (DE) in A549 cells treated with B[a]P; many of these genes were dependent on AhR expression including CYP1A1, CYP1B1 and TiPARP. GO analyses indicated that DE protein-coding RNAs in A549WT cells are associated with distinct molecular functions compared to A549KO cells. KEGG analyses showed the hsa01100 pathway was associated with DE lncRNA only in A549WT cells. A549KO cells treated with B[a]P exhibited a distinct set of differentially-regulated lncRNA including upregulation of HOTAIR. We further confirmed that despite AhR activation in A549WT cells, B[a]P did not alter the expression of many well-characterized lncRNA including NEAT1, HOTTIP, SOX2OT, MALAT1, H19, and Linc00673. Thus, there is control over select lncRNA expression in A549 cells exposed to B[a]P, a finding which could yield insight into the molecular function of the AhR.
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Affiliation(s)
- Aeshah Alluli
- Meakins-Christie Laboratories, McGill University, Montreal, Canada; Translational Research in Respiratory Diseases Program at the Research Institute of the McGill University Health Centre, Montreal, Canada; Department of Pathology, McGill University, Montreal, Canada
| | - Gregory Fonseca
- Meakins-Christie Laboratories, McGill University, Montreal, Canada; Translational Research in Respiratory Diseases Program at the Research Institute of the McGill University Health Centre, Montreal, Canada; Department of Medicine, McGill University, Montreal, Canada
| | - Jason Matthews
- Department of Nutrition, University of Oslo, Oslo, Norway; Department of Pharmacology & Toxicology, University of Toronto, Toronto, Canada
| | - David H Eidelman
- Meakins-Christie Laboratories, McGill University, Montreal, Canada; Department of Medicine, McGill University, Montreal, Canada
| | - Carolyn J Baglole
- Meakins-Christie Laboratories, McGill University, Montreal, Canada; Translational Research in Respiratory Diseases Program at the Research Institute of the McGill University Health Centre, Montreal, Canada; Department of Pathology, McGill University, Montreal, Canada; Department of Medicine, McGill University, Montreal, Canada; Department of Pharmacology and Therapeutics, McGill University, Montreal, Canada.
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2
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Alluli A, Rijnbout St James W, Eidelman DH, Baglole CJ. Dynamic relationship between the aryl hydrocarbon receptor and long noncoding RNA balances cellular and toxicological responses. Biochem Pharmacol 2023; 216:115745. [PMID: 37597813 DOI: 10.1016/j.bcp.2023.115745] [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: 06/07/2023] [Revised: 08/10/2023] [Accepted: 08/11/2023] [Indexed: 08/21/2023]
Abstract
The aryl hydrocarbon receptor (AhR) is a cytosolic transcription factor activated by endogenous ligands and xenobiotic chemicals. Once the AhR is activated, it translocates to the nucleus, dimerizes with the AhR nuclear translator (ARNT) and binds to xenobiotic response elements (XRE) to promote gene transcription, notably the cytochrome P450 CYP1A1. The AhR not only mediates the toxic effects of environmental chemicals, but also has numerous putative physiological functions. This dichotomy in AhR biology may be related to reciprocal regulation of long non-coding RNA (lncRNA). lncRNA are defined as transcripts more than 200 nucleotides in length that do not encode a protein but are implicated in many physiological processes such as cell differentiation, cell proliferation, and apoptosis. lncRNA are also linked to disease pathogenesis, particularly the development of cancer. Recent studies have revealed that AhR activation by environmental chemicals affects the expression and function of lncRNA. In this article, we provide an overview of AhR signaling pathways activated by diverse ligands and highlight key differences in the putative biological versus toxicological response of AhR activation. We also detail the functions of lncRNA and provide current data on their regulation by the AhR. Finally, we outline how overlap in function between AhR and lncRNA may be one way in which AhR can be both a regulator of endogenous functions but also a mediator of toxicological responses to environmental chemicals. Overall, more research is still needed to fully understand the dynamic interplay between the AhR and lncRNA.
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Affiliation(s)
- Aeshah Alluli
- Meakins-Christie Laboratories, McGill University, Canada; Translational Research in Respiratory Diseases Program at the Research Institute of the McGill University Health Centre, Canada; Department of Pathology, McGill University, Canada
| | - Willem Rijnbout St James
- Meakins-Christie Laboratories, McGill University, Canada; Translational Research in Respiratory Diseases Program at the Research Institute of the McGill University Health Centre, Canada; Department of Pathology, McGill University, Canada
| | - David H Eidelman
- Meakins-Christie Laboratories, McGill University, Canada; Department of Medicine, McGill University, Canada
| | - Carolyn J Baglole
- Meakins-Christie Laboratories, McGill University, Canada; Translational Research in Respiratory Diseases Program at the Research Institute of the McGill University Health Centre, Canada; Department of Pathology, McGill University, Canada; Department of Medicine, McGill University, Canada; Department of Pharmacology and Therapeutics, McGill University, Canada.
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3
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Mandal A, Biswas N, Alam MN. Implications of xenobiotic-response element(s) and aryl hydrocarbon receptor in health and diseases. Hum Cell 2023; 36:1638-1655. [PMID: 37329424 DOI: 10.1007/s13577-023-00931-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 06/01/2023] [Indexed: 06/19/2023]
Abstract
The effect of air pollution on public health is severely detrimental. In humans; the physiological response against pollutants is mainly elicited via the activation of aryl hydrocarbon receptor (AhR). It acts as a prime sensor of xenobiotic chemicals, also functioning as a transcription factor regulating a variety of gene expressions. Along with AhR, another pivotal element of the pollution stress pathway is Xenobiotic Response Elements (XREs). XRE, as studied are some conserved sequences in the DNA, responsible for the physiological response against pollutants. XRE is present at the upstream of the inducible target genes of AhR and it regulates the function of the AhR. XRE(s) are highly conserved in species as it has only eight specific sequences found so far in humans, mice, and rats. Inhalation of toxicants like dioxins, gaseous industrial effluents, and smoke from burning fuel and tobacco leads to predominant damage to the lungs. However, scientists are exploring the involvement of AhR in chronic diseases for example chronic obstructive pulmonary disease (COPD) and also other lethal diseases like lung cancer. In this review, we summarise what is known at this time about the roles played by the XRE and AhR in our molecular systems that have a defined control in the normal maintenance of homeostasis as well as dysfunctions.
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Affiliation(s)
- Avijit Mandal
- Department of Life Sciences, Presidency University, Kolkata, 700073, India
| | - Nabendu Biswas
- Department of Life Sciences, Presidency University, Kolkata, 700073, India
| | - Md Nur Alam
- Department of Life Sciences, Presidency University, Kolkata, 700073, India.
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4
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Shi J, Du T, Wang J, Tang C, Lei M, Yu W, Yang Y, Ma Y, Huang P, Chen H, Wang X, Sun J, Wang H, Zhang Y, Luo F, Huang Q, Li B, Lu S, Hu Y, Peng X. Aryl hydrocarbon receptor is a proviral host factor and a candidate pan-SARS-CoV-2 therapeutic target. SCIENCE ADVANCES 2023; 9:eadf0211. [PMID: 37256962 PMCID: PMC10413656 DOI: 10.1126/sciadv.adf0211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 04/25/2023] [Indexed: 06/02/2023]
Abstract
The emergence of a series of SARS-CoV-2 variants has necessitated the search for broad-spectrum antiviral targets. The aryl hydrocarbon receptor (AhR) senses tryptophan metabolites and is an immune regulator. However, the role of AhR in SARS-CoV-2 infection and whether AhR can be used as the target of antiviral therapy against SARS-CoV-2 and its variants are yet unclear. Here, we show that infection with SARS-CoV-2 activates AhR signaling and facilitates viral replication by interfering with IFN-I-driven antiviral immunity and up-regulating ACE2 receptor expression. The pharmacological AhR blockade or AhR knockout reduces SARS-CoV-2 and its variants' replication in vitro. Drug targeting of AhR with AhR antagonists markedly reduced SARS-CoV-2 and its variants' replication in vivo and ameliorated lung inflammation caused by SARS-CoV-2 infection in hamsters. Overall, AhR was a SARS-CoV-2 proviral host factor and a candidate host-directed broad-spectrum target for antiviral therapy against SARS-CoV-2 and its variants, including Delta and Omicron, and potentially other variants in the future.
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Affiliation(s)
- Jiandong Shi
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Tingfu Du
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Junbin Wang
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Cong Tang
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Mengyue Lei
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Wenhai Yu
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yun Yang
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Ying Ma
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Pu Huang
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Hongli Chen
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xu Wang
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jing Sun
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Haixuan Wang
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yong Zhang
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Fangyu Luo
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Qing Huang
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Bai Li
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Shuaiyao Lu
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yunzhang Hu
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xiaozhong Peng
- National Kunming High-level Biosafety Primate Research Center, Institute of Medical Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- State Key Laboratory of Medical Molecular Biology, Department of Molecular Biology and Biochemistry, Institute of Basic Medical Sciences, Medical Primate Research Center, Neuroscience Center, Chinese Academy of Medical Sciences, School of Basic Medicine, Peking Union Medical College, Beijing China
- Institute of Laboratory Animal Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing China
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5
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Heo MJ, Suh JH, Lee SH, Poulsen KL, An YA, Moorthy B, Hartig SM, Moore DD, Kim KH. Aryl hydrocarbon receptor maintains hepatic mitochondrial homeostasis in mice. Mol Metab 2023; 72:101717. [PMID: 37004989 PMCID: PMC10106517 DOI: 10.1016/j.molmet.2023.101717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 03/09/2023] [Accepted: 03/26/2023] [Indexed: 04/03/2023] Open
Abstract
OBJECTIVE Mitophagy removes damaged mitochondria to maintain cellular homeostasis. Aryl hydrocarbon receptor (AhR) expression in the liver plays a crucial role in supporting normal liver functions, but its impact on mitochondrial function is unclear. Here, we identified a new role of AhR in the regulation of mitophagy to control hepatic energy homeostasis. METHODS In this study, we utilized primary hepatocytes from AhR knockout (KO) mice and AhR knockdown AML12 hepatocytes. An endogenous AhR ligand, kynurenine (Kyn), was used to activate AhR in AML12 hepatocytes. Mitochondrial function and mitophagy process were comprehensively assessed by MitoSOX and mt-Keima fluorescence imaging, Seahorse XF-based oxygen consumption rate measurement, and Mitoplate S-1 mitochondrial substrate utilization analysis. RESULTS Transcriptomic analysis indicated that mitochondria-related gene sets were dysregulated in AhR KO liver. In both primary mouse hepatocytes and AML12 hepatocyte cell lines, AhR inhibition strongly suppressed mitochondrial respiration rate and substrate utilization. AhR inhibition also blunted the fasting response of several essential autophagy genes and the mitophagy process. We further identified BCL2 interacting protein 3 (BNIP3), a mitophagy receptor that senses nutrient stress, as an AhR target gene. AhR is directly recruited to the Bnip3 genomic locus, and Bnip3 transcription was enhanced by AhR endogenous ligand treatment in wild-type liver and abolished entirely in AhR KO liver. Mechanistically, overexpression of Bnip3 in AhR knockdown cells mitigated the production of mitochondrial reactive oxygen species (ROS) and restored functional mitophagy. CONCLUSIONS AhR regulation of the mitophagy receptor BNIP3 coordinates hepatic mitochondrial function. Loss of AhR induces mitochondrial ROS production and impairs mitochondrial respiration. These findings provide new insight into how endogenous AhR governs hepatic mitochondrial homeostasis.
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Affiliation(s)
- Mi Jeong Heo
- Department of Anesthesiology, Critical Care and Pain Medicine and Center for Perioperative Medicine, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Ji Ho Suh
- Department of Anesthesiology, Critical Care and Pain Medicine and Center for Perioperative Medicine, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Sung Ho Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Chonnam National University, Gwangju 61186, South Korea
| | - Kyle L Poulsen
- Department of Anesthesiology, Critical Care and Pain Medicine and Center for Perioperative Medicine, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Yu A An
- Department of Anesthesiology, Critical Care and Pain Medicine and Center for Perioperative Medicine, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Bhagavatula Moorthy
- Section of Neonatology, Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, USA; Texas Children's Hospital, Houston, TX 77030, USA
| | - Sean M Hartig
- Division of Diabetes, Endocrinology, and Metabolism, Department of Medicine, Baylor College of Medicine, Houston, TX 77030, USA; Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - David D Moore
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA; Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, CA 94720, USA.
| | - Kang Ho Kim
- Department of Anesthesiology, Critical Care and Pain Medicine and Center for Perioperative Medicine, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030, USA; Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA.
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6
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Pariano M, Puccetti M, Stincardini C, Napolioni V, Gatticchi L, Galarini R, Renga G, Barola C, Bellet MM, D'Onofrio F, Nunzi E, Bartoli A, Antognelli C, Cariani L, Russo M, Porcaro L, Colombo C, Majo F, Lucidi V, Montemitro E, Fiscarelli E, Ellemunter H, Lass-Flörl C, Ricci M, Costantini C, Giovagnoli S, Romani L. Aryl Hydrocarbon Receptor Agonism Antagonizes the Hypoxia-driven Inflammation in Cystic Fibrosis. Am J Respir Cell Mol Biol 2023; 68:288-301. [PMID: 36252182 DOI: 10.1165/rcmb.2022-0196oc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Hypoxia contributes to the exaggerated yet ineffective airway inflammation that fails to oppose infections in cystic fibrosis (CF). However, the potential for impairment of essential immune functions by HIF-1α (hypoxia-inducible factor 1α) inhibition demands a better comprehension of downstream hypoxia-dependent pathways that are amenable for manipulation. We assessed here whether hypoxia may interfere with the activity of AhR (aryl hydrocarbon receptor), a versatile environmental sensor highly expressed in the lungs, where it plays a homeostatic role. We used murine models of Aspergillus fumigatus infection in vivo and human cells in vitro to define the functional role of AhR in CF, evaluate the impact of hypoxia on AhR expression and activity, and assess whether AhR agonism may antagonize hypoxia-driven inflammation. We demonstrated that there is an important interferential cross-talk between the AhR and HIF-1α signaling pathways in murine and human CF, in that HIF-1α induction squelched the normal AhR response through an impaired formation of the AhR:ARNT (aryl hydrocarbon receptor nuclear translocator)/HIF-1β heterodimer. However, functional studies and analysis of the AhR genetic variability in patients with CF proved that AhR agonism could prevent hypoxia-driven inflammation, restore immune homeostasis, and improve lung function. This study emphasizes the contribution of environmental factors, such as infections, in CF disease progression and suggests the exploitation of hypoxia:xenobiotic receptor cross-talk for antiinflammatory therapy in CF.
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Affiliation(s)
| | - Matteo Puccetti
- Department of Pharmaceutical Science, University of Perugia, Perugia, Italy
| | | | - Valerio Napolioni
- School of Biosciences and Veterinary Medicine, University of Camerino, Camerino, Italy
| | | | - Roberta Galarini
- Istituto Zooprofilattico Sperimentale dell' Umbria e delle Marche "Togo Rosati," Perugia, Italy
| | | | - Carolina Barola
- Istituto Zooprofilattico Sperimentale dell' Umbria e delle Marche "Togo Rosati," Perugia, Italy
| | | | | | | | | | | | - Lisa Cariani
- Fondazione Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Ca' Granda Ospedale Maggiore Policlinico di Milano, Italy
| | - Maria Russo
- Fondazione Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Ca' Granda Ospedale Maggiore Policlinico di Milano, Italy
| | - Luigi Porcaro
- Fondazione Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Ca' Granda Ospedale Maggiore Policlinico di Milano, Italy
| | - Carla Colombo
- Fondazione Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Ca' Granda Ospedale Maggiore Policlinico di Milano, Italy
| | | | | | | | | | - Helmut Ellemunter
- Cystic Fibrosis Centre, Medical University Innsbruck, Innsbruck, Austria
| | | | - Maurizio Ricci
- Department of Pharmaceutical Science, University of Perugia, Perugia, Italy
| | | | - Stefano Giovagnoli
- Department of Pharmaceutical Science, University of Perugia, Perugia, Italy
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7
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Duarte-Hospital C, Tête A, Brial F, Benoit L, Koual M, Tomkiewicz C, Kim MJ, Blanc EB, Coumoul X, Bortoli S. Mitochondrial Dysfunction as a Hallmark of Environmental Injury. Cells 2021; 11:cells11010110. [PMID: 35011671 PMCID: PMC8750015 DOI: 10.3390/cells11010110] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/24/2021] [Accepted: 12/27/2021] [Indexed: 02/07/2023] Open
Abstract
Environmental factors including diet, sedentary lifestyle and exposure to pollutants largely influence human health throughout life. Cellular and molecular events triggered by an exposure to environmental pollutants are extremely variable and depend on the age, the chronicity and the doses of exposure. Only a fraction of all relevant mechanisms involved in the onset and progression of pathologies in response to toxicants has probably been identified. Mitochondria are central hubs of metabolic and cell signaling responsible for a large variety of biochemical processes, including oxidative stress, metabolite production, energy transduction, hormone synthesis, and apoptosis. Growing evidence highlights mitochondrial dysfunction as a major hallmark of environmental insults. Here, we present mitochondria as crucial organelles for healthy metabolic homeostasis and whose dysfunction induces critical adverse effects. Then, we review the multiple mechanisms of action of pollutants causing mitochondrial toxicity in link with chronic diseases. We propose the Aryl hydrocarbon Receptor (AhR) as a model of “exposome receptor”, whose activation by environmental pollutants leads to various toxic events through mitochondrial dysfunction. Finally, we provide some remarks related to mitotoxicity and risk assessment.
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Affiliation(s)
- Carolina Duarte-Hospital
- Environmental Toxicity, Therapeutic Targets, Cellular Signaling and Biomarkers, T3S, INSERM UMR-S 1124, F-75006 Paris, France; (C.D.-H.); (A.T.); (F.B.); (L.B.); (M.K.); (C.T.); (M.J.K.); (E.B.B.)
- Faculty of Sciences, Université de Paris, F-75006 Paris, France
| | - Arnaud Tête
- Environmental Toxicity, Therapeutic Targets, Cellular Signaling and Biomarkers, T3S, INSERM UMR-S 1124, F-75006 Paris, France; (C.D.-H.); (A.T.); (F.B.); (L.B.); (M.K.); (C.T.); (M.J.K.); (E.B.B.)
- Faculty of Sciences, Université de Paris, F-75006 Paris, France
| | - François Brial
- Environmental Toxicity, Therapeutic Targets, Cellular Signaling and Biomarkers, T3S, INSERM UMR-S 1124, F-75006 Paris, France; (C.D.-H.); (A.T.); (F.B.); (L.B.); (M.K.); (C.T.); (M.J.K.); (E.B.B.)
| | - Louise Benoit
- Environmental Toxicity, Therapeutic Targets, Cellular Signaling and Biomarkers, T3S, INSERM UMR-S 1124, F-75006 Paris, France; (C.D.-H.); (A.T.); (F.B.); (L.B.); (M.K.); (C.T.); (M.J.K.); (E.B.B.)
- Faculty of Sciences, Université de Paris, F-75006 Paris, France
| | - Meriem Koual
- Environmental Toxicity, Therapeutic Targets, Cellular Signaling and Biomarkers, T3S, INSERM UMR-S 1124, F-75006 Paris, France; (C.D.-H.); (A.T.); (F.B.); (L.B.); (M.K.); (C.T.); (M.J.K.); (E.B.B.)
- Faculty of Sciences, Université de Paris, F-75006 Paris, France
| | - Céline Tomkiewicz
- Environmental Toxicity, Therapeutic Targets, Cellular Signaling and Biomarkers, T3S, INSERM UMR-S 1124, F-75006 Paris, France; (C.D.-H.); (A.T.); (F.B.); (L.B.); (M.K.); (C.T.); (M.J.K.); (E.B.B.)
- Faculty of Sciences, Université de Paris, F-75006 Paris, France
| | - Min Ji Kim
- Environmental Toxicity, Therapeutic Targets, Cellular Signaling and Biomarkers, T3S, INSERM UMR-S 1124, F-75006 Paris, France; (C.D.-H.); (A.T.); (F.B.); (L.B.); (M.K.); (C.T.); (M.J.K.); (E.B.B.)
- Université Sorbonne Paris Nord, F-93000 Bobigny, France
| | - Etienne B. Blanc
- Environmental Toxicity, Therapeutic Targets, Cellular Signaling and Biomarkers, T3S, INSERM UMR-S 1124, F-75006 Paris, France; (C.D.-H.); (A.T.); (F.B.); (L.B.); (M.K.); (C.T.); (M.J.K.); (E.B.B.)
- Faculty of Sciences, Université de Paris, F-75006 Paris, France
| | - Xavier Coumoul
- Environmental Toxicity, Therapeutic Targets, Cellular Signaling and Biomarkers, T3S, INSERM UMR-S 1124, F-75006 Paris, France; (C.D.-H.); (A.T.); (F.B.); (L.B.); (M.K.); (C.T.); (M.J.K.); (E.B.B.)
- Faculty of Sciences, Université de Paris, F-75006 Paris, France
- Correspondence: (X.C.); (S.B.); Tel.: +33-1-76-53-43-70 (S.B.)
| | - Sylvie Bortoli
- Environmental Toxicity, Therapeutic Targets, Cellular Signaling and Biomarkers, T3S, INSERM UMR-S 1124, F-75006 Paris, France; (C.D.-H.); (A.T.); (F.B.); (L.B.); (M.K.); (C.T.); (M.J.K.); (E.B.B.)
- Faculty of Sciences, Université de Paris, F-75006 Paris, France
- Correspondence: (X.C.); (S.B.); Tel.: +33-1-76-53-43-70 (S.B.)
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8
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Endogenous regulation of the Akt pathway by the aryl hydrocarbon receptor (AhR) in lung fibroblasts. Sci Rep 2021; 11:23189. [PMID: 34848742 PMCID: PMC8632926 DOI: 10.1038/s41598-021-02339-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 11/08/2021] [Indexed: 11/23/2022] Open
Abstract
The aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor known to mediate toxic responses to dioxin. However, the role of the AhR in the regulation of cellular physiology has only recently been appreciated, including its ability to control cell cycle progression and apoptosis by unknown mechanisms. We hypothesized that the AhR enhances the activation of the AKT serine/threonine kinase (Akt) pathway to promote cell survival. Utilizing AhR knock-out (Ahr−/−) and wild-type (Ahr+/+) mouse lung fibroblasts (MLFs), we found that Ahr−/− MLFs have significantly higher basal Akt phosphorylation but that AhR did not affect Akt phosphorylation in MLFs exposed to growth factors or AhR ligands. Basal Akt phosphorylation was dependent on PI3K but was unaffected by changes in intracellular glutathione (GSH) or p85α. There was no significant decrease in cell viability in Ahr−/− MLFs treated with LY294002—a PI3K inhibitor—although LY294002 did attenuate MTT reduction, indicating an affect on mitochondrial function. Using a mass spectrometry (MS)-based approach, we identified several proteins that were differentially phosphorylated in the Ahr−/− MLFs compared to control cells, including proteins involved in the regulation of extracellular matrix (ECM), focal adhesion, cytoskeleton remodeling and mitochondrial function. In conclusion, Ahr ablation increased basal Akt phosphorylation in MLFs. Our results indicate that AhR may modulate the phosphorylation of a variety of novel proteins not previously identified as AhR targets, findings that help advance our understanding of the endogenous functions of AhR.
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9
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Jia Y, Zhao Y, Zhang Z, Shi L, Fang Y, Chang C. Aryl hydrocarbon receptor signaling pathway plays important roles in the proliferative and metabolic properties of bone marrow mesenchymal stromal cells. Acta Biochim Biophys Sin (Shanghai) 2021; 53:1428-1439. [PMID: 34508548 DOI: 10.1093/abbs/gmab122] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Indexed: 02/07/2023] Open
Abstract
Bone marrow mesenchymal stromal cells (BMMSCs) are widely sourced and easily amplified in vitro; thus, they have a great potential in the treatment of hemopathies. Recent findings suggested that BMMSCs express the aryl hydrocarbon receptor (AHR). However, few studies have reported on the regulation of proliferative behaviors and metabolism by AHR in BMMSCs. In the present study, we found that activating AHR reduced the proliferation of BMMSCs and enhanced their mitochondrial function, whereas inhibiting AHR exerted the opposite effects. This study may provide the basis for further unveiling the molecular mechanisms and therapeutic potential of AHR in BMMSCs.
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Affiliation(s)
- Yan Jia
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Youshan Zhao
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Zheng Zhang
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Lei Shi
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Ying Fang
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Chunkang Chang
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
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10
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Sahebnasagh A, Hashemi J, Khoshi A, Saghafi F, Avan R, Faramarzi F, Azimi S, Habtemariam S, Sureda A, Khayatkashani M, Safdari M, Rezai Ghaleno H, Soltani H, Khayat Kashani HR. Aromatic hydrocarbon receptors in mitochondrial biogenesis and function. Mitochondrion 2021; 61:85-101. [PMID: 34600156 DOI: 10.1016/j.mito.2021.09.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 09/17/2021] [Accepted: 09/27/2021] [Indexed: 12/11/2022]
Abstract
Mitochondria are ubiquitous membrane-bound organelles that not only play a key role in maintaining cellular energy homeostasis and metabolism but also in signaling and apoptosis. Aryl hydrocarbons receptors (AhRs) are ligand-activated transcription factors that recognize a wide variety of xenobiotics, including polyaromatic hydrocarbons and dioxins, and activate diverse detoxification pathways. These receptors are also activated by natural dietary compounds and endogenous metabolites. In addition, AhRs can modulate the expression of a diverse array of genes related to mitochondrial biogenesis and function. The aim of the present review is to analyze scientific data available on the AhR signaling pathway and its interaction with the intracellular signaling pathways involved in mitochondrial functions, especially those related to cell cycle progression and apoptosis. Various evidence have reported the crosstalk between the AhR signaling pathway and the nuclear factor κB (NF-κB), tyrosine kinase receptor signaling and mitogen-activated protein kinases (MAPKs). The AhR signaling pathway seems to promote cell cycle progression in the absence of exogenous ligands, whereas the presence of exogenous ligands induces cell cycle arrest. However, its effects on apoptosis are controversial since activation or overexpression of AhR has been observed to induce or inhibit apoptosis depending on the cell type. Regarding the mitochondria, although activation by endogenous ligands is related to mitochondrial dysfunction, the effects of endogenous ligands are not well understood but point towards antiapoptotic effects and inducers of mitochondrial biogenesis.
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Affiliation(s)
- Adeleh Sahebnasagh
- Clinical Research Center, Department of Internal Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Javad Hashemi
- Department of Pathobiology and Laboratory Sciences, School of Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Amirhosein Khoshi
- Department of Clinical Biochemistry, School of Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Fatemeh Saghafi
- Department of Clinical Pharmacy, Faculty of Pharmacy and Pharmaceutical Sciences Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Razieh Avan
- Assistant Professor of Clinical Pharmacy, Department of Clinical Pharmacy, Medical Toxicology and Drug Abuse Research Center (MTDRC), Faculty of Pharmacy, Birjand University of Medical Sciences, Birjand, Iran
| | - Fatemeh Faramarzi
- Clinical Pharmacy Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Saeed Azimi
- Student Research Committee, Department of Clinical Pharmacy, Faculty of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Solomon Habtemariam
- Pharmacognosy Research Laboratories and Herbal Analysis Services, School of Science, University of Greenwich, Central Avenue, Chatham-Maritime, Kent ME4 4TB, United Kingdom
| | - Antoni Sureda
- Research Group in Community Nutrition and Oxidative Stress, University of the Balearic Islands and Health Research Institute of Balearic Islands (IdISBa), Palma de Mallorca, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III (ISCIII), Madrid, Spain
| | - Maryam Khayatkashani
- School of Iranian Traditional Medicine, Tehran University of Medical Sciences, 14155-6559 Tehran, Iran
| | - Mohammadreza Safdari
- Department of Orthopedic Surgery, Faculty of Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Hassan Rezai Ghaleno
- Department of Surgery, Faculty of Medicine, Lorestan University of Medical Sciences, Khorramabad, Iran
| | - Hosseinali Soltani
- Department of General Surgery, Imam Ali Hospital, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Hamid Reza Khayat Kashani
- Department of Neurosurgery, Imam Hossein Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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11
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Hsu HL, Chen HK, Tsai CH, Liao PL, Chan YJ, Lee YC, Lee CC, Li CH. Aryl Hydrocarbon Receptor Defect Attenuates Mitogen-Activated Signaling through Leucine-Rich Repeats and Immunoglobulin-like Domains 1 (LRIG1)-Dependent EGFR Degradation. Int J Mol Sci 2021; 22:9988. [PMID: 34576152 PMCID: PMC8464816 DOI: 10.3390/ijms22189988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 09/05/2021] [Accepted: 09/11/2021] [Indexed: 11/17/2022] Open
Abstract
Aryl hydrocarbon receptor (AHR) genomic pathway has been well-characterized in a number of respiratory diseases. In addition, the cytoplasmic AHR protein may act as an adaptor of E3 ubiquitin ligase. In this study, the physiological functions of AHR that regulate cell proliferation were explored using the CRISPR/Cas9 system. The doubling-time of the AHR-KO clones of A549 and BEAS-2B was observed to be prolonged. The attenuation of proliferation potential was strongly associated with either the induction of p27Kip1 or the impairment in mitogenic signal transduction driven by the epidermal growth factor (EGF) and EGF receptor (EGFR). We found that the leucine-rich repeats and immunoglobulin-like domains 1 (LRIG1), a repressor of EGFR, was induced in the absence of AHR in vitro and in vivo. The LRIG1 tends to degrade via a proteasome dependent manner by interacting with AHR in wild-type cells. Either LRIG1 or a disintegrin and metalloprotease 17 (ADAM17) were accumulated in AHR-defective cells, consequently accelerating the degradation of EGFR, and attenuating the response to mitogenic stimulation. We also affirmed low AHR but high LRIG1 levels in lung tissues of chronic obstructive pulmonary disease (COPD) patients. This might partially elucidate the sluggish tissue repairment and developing inflammation in COPD patients.
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Affiliation(s)
- Han-Lin Hsu
- Division of Pulmonary Medicine, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei 116, Taiwan;
- Pulmonary Research Center, Wan Fang Hospital, Taipei Medical University, Taipei 116, Taiwan
- School of Respiratory Therapy, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Hong-Kai Chen
- School of Respiratory Therapy, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
- Department of Physiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Chi-Hao Tsai
- Department of Ophthalmology, University of North Carolina School of Medicine, Chapel Hill, NC 27517, USA;
| | - Po-Lin Liao
- Institute of Food Safety and Health Risk Assessment, School of Pharmaceutical Sciences, National Yang-Ming University, Taipei 112, Taiwan;
| | - Yen-Ju Chan
- Department of Physiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Yu-Cheng Lee
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
| | - Chen-Chen Lee
- Department of Microbiology and Immunology, School of Medicine, China Medicine University, Taichung 404, Taiwan;
| | - Ching-Hao Li
- Department of Physiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 110, Taiwan;
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12
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Jia Y, Guo J, Zhao Y, Zhang Z, Shi L, Fang Y, Wu D, Wu L, Chang C. AHR signaling pathway reshapes the metabolism of AML/MDS cells and potentially leads to cytarabine resistance. Acta Biochim Biophys Sin (Shanghai) 2021; 53:492-500. [PMID: 33709099 DOI: 10.1093/abbs/gmab017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Indexed: 01/08/2023] Open
Abstract
Emerging evidence suggests that aryl hydrocarbon receptor (AHR) promotes the initiation, invasion, progression, and metastasis of cancer cells. However, its effects in patients with myelodysplastic syndrome/acute myeloid leukemia (MDS/AML) remain undefined. In this study, we aimed to investigate the effects of AHR activation on malignant cells in patients with MDS/AML. We found that AHR was expressed aberrantly in patients with MDS/AML. Further studies demonstrated that inhibiting AHR decreased the mitochondrial dehydrogenase content and the mitochondrial membrane potential (MMP) in MDS/AML cells. Activating AHR with L-kynurenine (Kyn) increased AHR expression, which was accompanied by an increase in mitochondrial dehydrogenase content and MMP in MDS/AML cells. Moreover, the expression level of mitochondria-associated mitochondrial transcription factor A was increased after activating AHR with L-Kyn when compared with that in the control group but decreased after inhibiting the AHR signal. Activating AHR in MDS/AML cells enhanced the resistance to cytarabine. These findings indicated that activating the AHR signaling pathway reshaped the metabolism in MDS/AML cells, thus contributing to the resistance to cytarabine.
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Affiliation(s)
- Yan Jia
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Juan Guo
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Youshan Zhao
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Zheng Zhang
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Lei Shi
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Ying Fang
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Dong Wu
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Lingyun Wu
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
| | - Chunkang Chang
- Department of Hematology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China
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13
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Zhou Q, Zheng Y, Sun Y. Neddylation regulation of mitochondrial structure and functions. Cell Biosci 2021; 11:55. [PMID: 33731189 PMCID: PMC7968265 DOI: 10.1186/s13578-021-00569-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 03/06/2021] [Indexed: 12/11/2022] Open
Abstract
Mitochondria are the powerhouse of a cell. The structure and function of mitochondria are precisely regulated by multiple signaling pathways. Neddylation, a post-translational modification, plays a crucial role in various cellular processes including cellular metabolism via modulating the activity, function and subcellular localization of its substrates. Recently, accumulated data demonstrated that neddylation is involved in regulation of morphology, trafficking and function of mitochondria. Mechanistic elucidation of how mitochondria is modulated by neddylation would further our understanding of mitochondrial regulation to a new level. In this review, we first briefly introduce mitochondria, then neddylation cascade, and known protein substrates subjected to neddylation modification. Next, we summarize current available data of how neddylation enzymes, its substrates (including cullins/Cullin-RING E3 ligases and non-cullins) and its inhibitor MLN4924 regulate the structure and function of mitochondria. Finally, we propose the future perspectives on this emerging and exciting field of mitochondrial research.
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Affiliation(s)
- Qiyin Zhou
- Cancer Institute, The Second Affiliated Hospital, and Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou, 310029, Zhejiang, China.,Department of Medical Oncology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, 310016, Zhejiang, China
| | - Yawen Zheng
- Cancer Institute, The Second Affiliated Hospital, and Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou, 310029, Zhejiang, China
| | - Yi Sun
- Cancer Institute, The Second Affiliated Hospital, and Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou, 310029, Zhejiang, China.
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14
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Eurotium cristatum Fermented Loose Dark Tea Ameliorates Cigarette Smoke-Induced Lung Injury by MAPK Pathway and Enhances Hepatic Metabolic Detoxification by PXR/ AhR Pathway in Mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:6635080. [PMID: 33777316 PMCID: PMC7972846 DOI: 10.1155/2021/6635080] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 01/05/2021] [Accepted: 02/26/2021] [Indexed: 01/28/2023]
Abstract
Cigarette smoke- (CS-) induced oxidative stress and inflammation in the lung are serious health problems. Primary and reprocessed tea products contain multiple antioxidants that have been reported to protect the lung against CS-induced injury. However, the beneficial effects of Eurotium cristatum fermented loose dark tea (ECT) and Eurotium cristatum particle metabolites (ECP) on CS-induced lung injury and its potential hepatic metabolic detoxification are still unclear. Therefore, sixty mice were randomly divided into six equal groups. CS-exposed mice were prevented or treated with ECP or ECT infusions for 12 or 8 weeks to determine the antioxidative stress, anti-inflammatory and potential metabolic detoxification of ECT and ECP. Thirty-six mice were randomly divided into six equal groups to observe the effects on hepatic metabolic detoxification by replacing daily drinking water with ECT. Results showed that CS significantly decreased the activities of glutathione peroxidase (GSH-Px) and superoxide dismutase (SOD) and upregulated the expressions of malondialdehyde (MDA), tumor necrosis factor alpha (TNF-α), interleukin-6 (IL-6), IL-8, and IL-1β in serum. These adverse effects were modulated by ECP and ECT. In addition, ECT upregulated the mRNA expression of pregnane X receptor (PXR) and cytochrome P450 (CYP450) in the liver on daily free drinking ECT mice group. Western blot analysis further revealed that in CS-exposed mice, ECP and ECT significantly decreased the phosphorylation of mitogen-activated protein kinase (MAPK) in the lung but upregulated the protein expressions of PXR and aryl hydrocarbon receptor (AhR) in the liver. Overall, our findings demonstrated that ECT and ECP protected against lung injury induced by CS via MAPK pathway and enhanced hepatic metabolic detoxification via PXR and AhR pathways. Therefore, daily intake of ECT and ECP can potentially protect against CS-induced oxidative and inflammatory injuries.
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15
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Guerrina N, Traboulsi H, Rico de Souza A, Bossé Y, Thatcher TH, Robichaud A, Ding J, Li PZ, Simon L, Pareek S, Bourbeau J, Tan WC, Benedetti A, Obeidat M, Sin DD, Brandsma CA, Nickle DC, Sime PJ, Phipps RP, Nair P, Zago M, Hamid Q, Smith BM, Eidelman DH, Baglole CJ. Aryl hydrocarbon receptor deficiency causes the development of chronic obstructive pulmonary disease through the integration of multiple pathogenic mechanisms. FASEB J 2021; 35:e21376. [PMID: 33605487 DOI: 10.1096/fj.202002350r] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 12/17/2020] [Accepted: 01/04/2021] [Indexed: 01/26/2023]
Abstract
Emphysema, a component of chronic obstructive pulmonary disease (COPD), is characterized by irreversible alveolar destruction that results in a progressive decline in lung function. This alveolar destruction is caused by cigarette smoke, the most important risk factor for COPD. Only 15%-20% of smokers develop COPD, suggesting that unknown factors contribute to disease pathogenesis. We postulate that the aryl hydrocarbon receptor (AHR), a receptor/transcription factor highly expressed in the lungs, may be a new susceptibility factor whose expression protects against COPD. Here, we report that Ahr-deficient mice chronically exposed to cigarette smoke develop airspace enlargement concomitant with a decline in lung function. Chronic cigarette smoke exposure also increased cleaved caspase-3, lowered SOD2 expression, and altered MMP9 and TIMP-1 levels in Ahr-deficient mice. We also show that people with COPD have reduced expression of pulmonary and systemic AHR, with systemic AHR mRNA levels positively correlating with lung function. Systemic AHR was also lower in never-smokers with COPD. Thus, AHR expression protects against the development of COPD by controlling interrelated mechanisms involved in the pathogenesis of this disease. This study identifies the AHR as a new, central player in the homeostatic maintenance of lung health, providing a foundation for the AHR as a novel therapeutic target and/or predictive biomarker in chronic lung disease.
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Affiliation(s)
- Necola Guerrina
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada.,Department of Pathology, McGill University, Montreal, QC, Canada
| | - Hussein Traboulsi
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada
| | | | - Yohan Bossé
- Institut universitaire de cardiologie et de pneumologie de Québec, Department of Molecular Medicine, Laval University, Quebec City, QC, Canada
| | - Thomas H Thatcher
- Department of Internal Medicine, Virginia Commonwealth University, Richmond, VA, USA
| | | | - Jun Ding
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada.,Department of Medicine, McGill University, Montreal, QC, Canada
| | - Pei Z Li
- Respiratory Epidemiology and Clinical Research Unit, McGill University Health Centre, Montreal, QC, Canada
| | - Leora Simon
- Department of Medicine, McGill University, Montreal, QC, Canada
| | - Swati Pareek
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada.,Department of Pathology, McGill University, Montreal, QC, Canada
| | - Jean Bourbeau
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada.,Department of Medicine, McGill University, Montreal, QC, Canada.,Respiratory Epidemiology and Clinical Research Unit, McGill University Health Centre, Montreal, QC, Canada
| | - Wan C Tan
- The University of British Columbia (UBC) James Hogg Research Centre, UBC, Vancouver, BC, Canada
| | - Andrea Benedetti
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada.,Department of Medicine, McGill University, Montreal, QC, Canada.,Respiratory Epidemiology and Clinical Research Unit, McGill University Health Centre, Montreal, QC, Canada.,Department of Epidemiology, McGill University, Montreal, QC, Canada.,Department of Biostatistics, McGill University, Montreal, QC, Canada.,Department of Occupational Health, McGill University, Montreal, QC, Canada
| | - Ma'en Obeidat
- Centre for Heart Lung Innovation, St. Paul's Hospital, UBC, Vancouver, BC, Canada.,Division of Respiratory Medicine, UBC, Vancouver, BC, Canada
| | - Don D Sin
- Centre for Heart Lung Innovation, St. Paul's Hospital, UBC, Vancouver, BC, Canada.,Division of Respiratory Medicine, UBC, Vancouver, BC, Canada
| | - Corry-Anke Brandsma
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | | | - Patricia J Sime
- Department of Internal Medicine, Virginia Commonwealth University, Richmond, VA, USA
| | - Richard P Phipps
- Department of Environmental Medicine, University of Rochester, Rochester, NY, USA
| | - Parameswaran Nair
- Department of Medicine, McMaster University & St Joseph's Healthcare, Hamilton, ON, Canada
| | | | - Qutayba Hamid
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada.,Department of Medicine, McGill University, Montreal, QC, Canada.,University of Sharjah College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Benjamin M Smith
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada.,Department of Medicine, McGill University, Montreal, QC, Canada.,Respiratory Epidemiology and Clinical Research Unit, McGill University Health Centre, Montreal, QC, Canada
| | | | - Carolyn J Baglole
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada.,Department of Pathology, McGill University, Montreal, QC, Canada.,Department of Medicine, McGill University, Montreal, QC, Canada.,Department of Pharmacology & Therapeutics, McGill University, Montreal, QC, Canada
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16
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Rico de Souza A, Traboulsi H, Wang X, Fritz JH, Eidelman DH, Baglole CJ. The Aryl Hydrocarbon Receptor Attenuates Acute Cigarette Smoke-Induced Airway Neutrophilia Independent of the Dioxin Response Element. Front Immunol 2021; 12:630427. [PMID: 33659010 PMCID: PMC7917085 DOI: 10.3389/fimmu.2021.630427] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 01/22/2021] [Indexed: 12/20/2022] Open
Abstract
Cigarette smoke is a prevalent respiratory toxicant that remains a leading cause of death worldwide. Cigarette smoke induces inflammation in the lungs and airways that contributes to the development of diseases such as lung cancer and chronic obstructive pulmonary disease (COPD). Due to the presence of aryl hydrocarbon receptor (AhR) ligands in cigarette smoke, activation of the AhR has been implicated in driving this inflammatory response. However, we have previously shown that the AhR suppresses cigarette smoke-induced pulmonary inflammation, but the mechanism by which the AhR achieves its anti-inflammatory function is unknown. In this study, we use the AhR antagonist CH-223191 to inhibit AhR activity in mice. After an acute (3-day) cigarette smoke exposure, AhR inhibition was associated with significantly enhanced neutrophilia in the airways in response to cigarette smoke, mimicking the phenotype of AhR-deficient mice. We then used genetically-modified mouse strains which express an AhR that can bind ligand but either cannot translocate to the nucleus or bind its cognate response element, to show that these features of the AhR pathway are not required for the AhR to suppress pulmonary neutrophilia. Finally, using the non-toxic endogenous AhR ligand FICZ, we provide proof-of-concept that activation of pulmonary AhR attenuates smoke-induced inflammation. Collectively, these results support the importance of AhR activity in mediating its anti-inflammatory function in response to cigarette smoke. Further investigation of the precise mechanisms by which the AhR exerts is protective functions may lead to the development of therapeutic agents to treat people with chronic lung diseases that have an inflammatory etiology, but for which few therapeutic options exist.
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Affiliation(s)
| | - Hussein Traboulsi
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada
- Department of Medicine, McGill University, Montreal, QC, Canada
| | - Xinyu Wang
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada
- Department of Medicine, McGill University, Montreal, QC, Canada
- Department of Medicine, Western University, London, ON, Canada
| | - Jorg H. Fritz
- Department of Microbiology and Immunology, McGill University, Montreal, QC, Canada
| | | | - Carolyn J. Baglole
- Research Institute of the McGill University Health Centre, Montreal, QC, Canada
- Department of Medicine, McGill University, Montreal, QC, Canada
- Department of Pathology, McGill University, Montreal, QC, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
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17
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Yang D, Xu D, Wang T, Yuan Z, Liu L, Shen Y, Wen F. Mitoquinone ameliorates cigarette smoke-induced airway inflammation and mucus hypersecretion in mice. Int Immunopharmacol 2021; 90:107149. [PMID: 33191175 DOI: 10.1016/j.intimp.2020.107149] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 10/19/2020] [Accepted: 10/20/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND Cigarette smoking, which induces airway inflammation and mucus hypersecretion, is a major risk factor for the development of cigarette smoke (CS)-induced airway disorders. In this study, we investigated the effects and mechanisms of mitoquinone (MitoQ), a mitochondria-targeted antioxidant, on CS-induced airway inflammation and mucus hypersecretion in mice. METHODS C57BL/6J mice were exposed to CS for 75 min twice daily, 5 days per week for 4 weeks. MitoQ (2.5, 5 mg/kg/day) was administered intraperitoneally 1 h before CS exposure. Bronchoalveolar lavage fluid (BALF) was obtained for cell counting and determination of pro-inflammatory cytokine levels. Lung tissue was collected for histological examination; Western blotting was used to measure levels of Mfn2, Drp1, cytochrome c, NF-κB p65, and IκBα. RESULTS Pretreatment with MitoQ significantly attenuated CS-induced thickening of the airway epithelium, peribronchial inflammatory cell infiltration, goblet cell hyperplasia and Muc5ac staining. The numbers of total cells, neutrophils and macrophages, as well as levels of TNF-α and IL-6 in BALF were remarkably decreased by MitoQ in a dose-dependent manner. MitoQ attenuated oxidative stress by preventing the CS-induced increase in malondialdehyde level and decrease in superoxide dismutase activity and GSH/GSSG ratio. MitoQ decreased the expression of mitochondrial fission protein Drp1 and increased that of mitochondrial fusion protein Mfn2, as well as reduced cytochrome c release into the cytosol. Furthermore, MitoQ suppressed IκBα degradation and NF-κB p65 nuclear translocation. CONCLUSIONS MitoQ attenuates inflammation, mucus hypersecretion, and oxidative stress induced by CS. It may exert these effects in part by modulating mitochondrial function and the NF-κB signal pathway.
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Affiliation(s)
- Deqing Yang
- Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, and Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University, Chengdu, China
| | - Dan Xu
- Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, and Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University, Chengdu, China
| | - Tao Wang
- Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, and Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University, Chengdu, China
| | - Zhicheng Yuan
- Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, and Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University, Chengdu, China
| | - Lian Liu
- Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, and Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University, Chengdu, China
| | - Yongchun Shen
- Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, and Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University, Chengdu, China.
| | - Fuqiang Wen
- Division of Pulmonary Diseases, State Key Laboratory of Biotherapy of China, and Department of Respiratory and Critical Care Medicine, West China Hospital of Sichuan University, Chengdu, China.
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18
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Guerrina N, Aloufi N, Shi F, Prasade K, Mehrotra C, Traboulsi H, Matthews J, Eidelman DH, Hamid Q, Baglole CJ. The aryl hydrocarbon receptor reduces LC3II expression and controls endoplasmic reticulum stress. Am J Physiol Lung Cell Mol Physiol 2020; 320:L339-L355. [PMID: 33236922 DOI: 10.1152/ajplung.00122.2020] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor whose physiological function is poorly understood. The AhR is highly expressed in barrier organs such as the skin, intestine, and lung. The lungs are continuously exposed to environmental pollutants such as cigarette smoke (CS) that can induce cell death mechanisms such as apoptosis, autophagy, and endoplasmic reticulum (ER) stress. CS also contains toxicants that are AhR ligands. We have previously shown that the AhR protects against apoptosis, but whether the AhR also protects against autophagy or ER stress is not known. Using cigarette smoke extract (CSE) as our in vitro surrogate of environmental tobacco exposure, we first assessed the conversion of LC3I to LC3II, a classic feature of both autophagic and ER stress-mediated cell death pathways. LC3II was elevated in CSE-exposed lung structural cells [mouse lung fibroblasts (MLFs), MLE12 and A549 cells] when AhR was absent. However, this heightened LC3II expression could not be explained by increased expression of key autophagy genes (Gabarapl1, Becn1, Map1lc3b), upregulation of upstream autophagic machinery (Atg5-12, Atg3), or impaired autophagic flux, suggesting that LC3II may be autophagy independent. This was further supported by the absence of autophagosomes in Ahr-/- lung cells. However, Ahr-/- lung cells had widespread ER dilation, elevated expression of the ER stress markers CHOP and GADD34, and an accumulation of ubiquitinated proteins. These findings collectively illustrate a novel role for the AhR in attenuating ER stress by a mechanism that may be autophagy independent.
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Affiliation(s)
- Necola Guerrina
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada.,Department of Pathology, McGill University, Montreal, Quebec, Canada
| | - Noof Aloufi
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada.,Department of Pathology, McGill University, Montreal, Quebec, Canada
| | - Fangyi Shi
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada.,Department of Pathology, McGill University, Montreal, Quebec, Canada
| | - Kashmira Prasade
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - Caitlin Mehrotra
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec, Canada
| | - Hussein Traboulsi
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada.,Department of Medicine, McGill University, Montreal, Quebec, Canada
| | - Jason Matthews
- Department of Nutrition, University of Oslo, Oslo, Norway.,Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada
| | - David H Eidelman
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada.,Department of Medicine, McGill University, Montreal, Quebec, Canada
| | - Qutayba Hamid
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada.,Department of Medicine, McGill University, Montreal, Quebec, Canada.,College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Carolyn J Baglole
- Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada.,Department of Pathology, McGill University, Montreal, Quebec, Canada.,Department of Medicine, McGill University, Montreal, Quebec, Canada.,Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec, Canada
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19
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Brinkmann V, Ale-Agha N, Haendeler J, Ventura N. The Aryl Hydrocarbon Receptor (AhR) in the Aging Process: Another Puzzling Role for This Highly Conserved Transcription Factor. Front Physiol 2020; 10:1561. [PMID: 32009975 PMCID: PMC6971224 DOI: 10.3389/fphys.2019.01561] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 12/11/2019] [Indexed: 12/26/2022] Open
Abstract
Aging is the most important risk factor for the development of major life-threatening diseases such as cardiovascular disorders, cancer, and neurodegenerative disorders. The aging process is characterized by the accumulation of damage to intracellular macromolecules and it is concurrently shaped by genetic, environmental and nutritional factors. These factors influence the functionality of mitochondria, which play a central role in the aging process. Mitochondrial dysfunction is one of the hallmarks of aging and is associated with increased fluxes of ROS leading to damage of mitochondrial components, impaired metabolism of fatty acids, dysregulated glucose metabolism, and damage of adjacent organelles. Interestingly, many of the environmental (e.g., pollutants and other toxicants) and nutritional (e.g., flavonoids, carotenoids) factors influencing aging and mitochondrial function also directly or indirectly affect the activity of a highly conserved transcription factor, the Aryl hydrocarbon Receptor (AhR). Therefore, it is not surprising that many studies have already indicated a role of this versatile transcription factor in the aging process. We also recently found that the AhR promotes aging phenotypes across species. In this manuscript, we systematically review the existing literature on the contradictory studies indicating either pro- or anti-aging effects of the AhR and try to reconcile the seemingly conflicting data considering a possible dependency on the animal model, tissue, as well as level of AhR expression and activation. Moreover, given the crucial role of mitochondria in the aging process, we summarize the growing body of evidence pointing toward the influence of AhR on mitochondria, which can be of potential relevance for aging.
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Affiliation(s)
- Vanessa Brinkmann
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Niloofar Ale-Agha
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Judith Haendeler
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany.,Institute of Clinical Chemistry and Laboratory Diagnostic, Medical Faculty, Heinrich Heine University of Düsseldorf, Düsseldorf, Germany
| | - Natascia Ventura
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany.,Institute of Clinical Chemistry and Laboratory Diagnostic, Medical Faculty, Heinrich Heine University of Düsseldorf, Düsseldorf, Germany
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20
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Chen J, Yakkundi P, Chan WK. Down-Regulation of p23 in Normal Lung Epithelial Cells Reduces Toxicities From Exposure to Benzo[a]pyrene and Cigarette Smoke Condensate via an Aryl Hydrocarbon Receptor-Dependent Mechanism. Toxicol Sci 2019; 167:239-248. [PMID: 30204910 DOI: 10.1093/toxsci/kfy234] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The aryl hydrocarbon receptor (AHR) is a ligand-activated signaling molecule which controls tumor growth and metastasis, T cell differentiation, and liver development. Expression levels of this receptor protein is sensitive to the cellular p23 protein levels in immortalized cancer cell lines. As little as 30% reduction of the p23 cellular content can suppress the AHR function. Here we reported that down-regulation of the p23 protein content in normal, untransformed human bronchial/tracheal epithelial cells to 48% of its content also suppresses the AHR protein levels to 54% of its content. This p23-mediated suppression of AHR is responsible for the suppression of (1) the ligand-dependent induction of the cyp1a1 gene transcription; (2) the benzo[a]pyrene- or cigarette smoke condensate-induced CYP1A1 enzyme activity, and (3) the benzo[a]pyrene and cigarette smoke condensate-mediated production of reactive oxygen species. Reduction of the p23 content does not alter expression of oxidative stress genes and production of PGE2. Down regulation of p23 suppresses the AHR protein levels in two other untransformed cell types, namely human breast MCF-10A and mouse immune regulatory Tr1 cells. Collectively, down-regulation of p23 suppresses the AHR protein levels in normal and untransformed cells and can in principle protect our lung epithelial cells from AHR-dependent oxidative damage caused by exposure to agents from environment and cigarette smoking.
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Affiliation(s)
- Jinyun Chen
- Department of Pharmaceutics and Medicinal Chemistry, Thomas J. Long School of Pharmacy and Health Sciences, University of the Pacific, Stockton, California 95211
| | - Poonam Yakkundi
- Department of Pharmaceutics and Medicinal Chemistry, Thomas J. Long School of Pharmacy and Health Sciences, University of the Pacific, Stockton, California 95211
| | - William K Chan
- Department of Pharmaceutics and Medicinal Chemistry, Thomas J. Long School of Pharmacy and Health Sciences, University of the Pacific, Stockton, California 95211
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21
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Wang X, Li S, Liu L, Jian Z, Cui T, Yang Y, Guo S, Yi X, Wang G, Li C, Gao T, Li K. Role of the aryl hydrocarbon receptor signaling pathway in promoting mitochondrial biogenesis against oxidative damage in human melanocytes. J Dermatol Sci 2019; 96:33-41. [PMID: 31543430 DOI: 10.1016/j.jdermsci.2019.09.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 08/14/2019] [Accepted: 09/03/2019] [Indexed: 12/19/2022]
Abstract
BACKGROUND Reactive oxygen species (ROS)-induced mitochondrial damage aggravates oxidative stress and activates mitochondrial apoptosis pathway to mediate melanocyte death. However, the repair mechanisms underlying damaged mitochondria of melanocytes remain unclear. Accumulative evidence has revealed that the aryl hydrocarbon receptor (AHR), a ligand-activated transcription factor, plays a vital role in maintaining mitochondrial homeostasis. OBJECTIVE To investigate whether the AHR signaling pathway could protect human melanocytes from oxidative damage through controlling mitochondrial quality. METHODS We constructed an oxidative stress model of melanocytes with hydrogen peroxide (H2O2) in the human normal melanocyte PIG1 cell line, and detected ROS level, apoptosis, mitochondrial ROS level, mitochondrial membrane potential, ATP production, mitochondrial DNA and mitochondrial modulators after co-treatment with AHR ligand or antagonist and H2O2 in the PIG1 cells. RESULTS In the present study, we found that H2O2-induced oxidative stress directly activated the AHR signaling pathway in melanocytes, whereas abnormal activation of AHR signaling pathway enhanced oxidative damage to mitochondria and melanocytes. Further studies showed that the AHR signaling pathway promoted mitochondrial DNA synthesis and ATP production probably by regulating the expression of nuclear respiratory factor 1 (NRF1) and its downstream targets. CONCLUSION Our findings reveal that the AHR signaling pathway might have a major role in protecting melanocytes against oxidative damage via inducing mitochondrial biogenesis, while impaired AHR activation could cause defective repair of mitochondria and exacerbate oxidative damage-induced apoptosis in melanocytes. Our data suggest that the AHR signaling pathway might be a novel mechanism of mitochondrial biogenesis involved in protecting melanocytes from oxidative stress.
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Affiliation(s)
- Xiaowen Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China; Department of Clinical Oncology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Shuli Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Ling Liu
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Zhe Jian
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Tingting Cui
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Yuqi Yang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Sen Guo
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Xiuli Yi
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Gang Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Chunying Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Tianwen Gao
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China.
| | - Kai Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China.
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22
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Domingo-Vidal M, Whitaker-Menezes D, Martos-Rus C, Tassone P, Snyder CM, Tuluc M, Philp N, Curry J, Martinez-Outschoorn U. Cigarette Smoke Induces Metabolic Reprogramming of the Tumor Stroma in Head and Neck Squamous Cell Carcinoma. Mol Cancer Res 2019; 17:1893-1909. [PMID: 31239287 DOI: 10.1158/1541-7786.mcr-18-1191] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 05/17/2019] [Accepted: 06/18/2019] [Indexed: 12/15/2022]
Abstract
Head and neck squamous cell carcinoma (HNSCC) is comprised of metabolically linked distinct compartments. Cancer-associated fibroblasts (CAF) and nonproliferative carcinoma cells display a glycolytic metabolism, while proliferative carcinoma cells rely on mitochondrial oxidative metabolism fueled by the catabolites provided by the adjacent CAFs. Metabolic coupling between these reprogrammed compartments contributes to HNSCC aggressiveness. In this study, we examined the effects of cigarette smoke-exposed CAFs on metabolic coupling and tumor aggressiveness of HNSCC. Cigarette smoke (CS) extract was generated by dissolving cigarette smoke in growth media. Fibroblasts were cultured in CS or control media. HNSCC cells were cocultured in vitro and coinjected in vivo with CS or control fibroblasts. We found that CS induced oxidative stress, glycolytic flux and MCT4 expression, and senescence in fibroblasts. MCT4 upregulation was critical for fibroblast viability under CS conditions. The effects of CS on fibroblasts were abrogated by antioxidant treatment. Coculture of carcinoma cells with CS fibroblasts induced metabolic coupling with upregulation of the marker of glycolysis MCT4 in fibroblasts and markers of mitochondrial metabolism MCT1 and TOMM20 in carcinoma cells. CS fibroblasts increased CCL2 expression and macrophage migration. Coculture with CS fibroblasts also increased two features of carcinoma cell aggressiveness: resistance to cell death and enhanced cell migration. Coinjection of carcinoma cells with CS fibroblasts generated larger tumors with reduced apoptosis than control coinjections, and upregulation of MCT4 by CS exposure was a driver of these effects. We demonstrate that a tumor microenvironment exposed to CS is sufficient to modulate metabolism and cancer aggressiveness in HNSCC. IMPLICATIONS: CS shifts cancer stroma toward glycolysis and induces head and neck cancer aggressiveness with a mitochondrial profile linked by catabolite transporters and oxidative stress. VISUAL OVERVIEW: http://mcr.aacrjournals.org/content/molcanres/17/9/1893/F1.large.jpg.
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Affiliation(s)
- Marina Domingo-Vidal
- Department of Medical Oncology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Diana Whitaker-Menezes
- Department of Medical Oncology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Cristina Martos-Rus
- Department of Medical Oncology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Patrick Tassone
- Department of Otolaryngology - Head and Neck Surgery, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Christopher M Snyder
- Department of Microbiology and Immunology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Madalina Tuluc
- Department of Pathology, Anatomy and Cell Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Nancy Philp
- Department of Pathology, Anatomy and Cell Biology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Joseph Curry
- Department of Otolaryngology - Head and Neck Surgery, Thomas Jefferson University, Philadelphia, Pennsylvania.
| | - Ubaldo Martinez-Outschoorn
- Department of Medical Oncology, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania.
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23
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Voic H, Li X, Jang JH, Zou C, Sundd P, Alder J, Rojas M, Chandra D, Randell S, Mallampalli RK, Tesfaigzi Y, Ryba T, Nyunoya T. RNA sequencing identifies common pathways between cigarette smoke exposure and replicative senescence in human airway epithelia. BMC Genomics 2019; 20:22. [PMID: 30626320 PMCID: PMC6325884 DOI: 10.1186/s12864-018-5409-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 12/26/2018] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND Aging is affected by genetic and environmental factors, and cigarette smoking is strongly associated with accumulation of senescent cells. In this study, we wanted to identify genes that may potentially be beneficial for cell survival in response to cigarette smoke and thereby may contribute to development of cellular senescence. RESULTS Primary human bronchial epithelial cells from five healthy donors were cultured, treated with or without 1.5% cigarette smoke extract (CSE) for 24 h or were passaged into replicative senescence. Transcriptome changes were monitored using RNA-seq in CSE and non-CSE exposed cells and those passaged into replicative senescence. We found that, among 1534 genes differentially regulated during senescence and 599 after CSE exposure, 243 were altered in both conditions, representing strong enrichment. Pathways and gene sets overrepresented in both conditions belonged to cellular processes that regulate reactive oxygen species, proteasome degradation, and NF-κB signaling. CONCLUSIONS Our results offer insights into gene expression responses during cellular aging and cigarette smoke exposure, and identify potential molecular pathways that are altered by cigarette smoke and may also promote airway epithelial cell senescence.
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Affiliation(s)
- Hannah Voic
- 0000 0004 0504 9575grid.422569.eDivision of Natural Sciences, New College of Florida, Sarasota, FL USA
| | - Xiuying Li
- 0000 0004 1936 9000grid.21925.3dDepartment of Medicine, University of Pittsburgh, NW628 UPMC Montefiore, 3459 Fifth Avenue, Pittsburgh, PA 15213 USA ,0000 0004 0420 3665grid.413935.9VA Pittsburgh Healthcare System, Pittsburgh, PA USA
| | - Jun-Ho Jang
- 0000 0004 0454 5075grid.417046.0Cardiovascular Institute, Department of Medicine, Allegheny Health Network, Pittsburgh, PA USA
| | - Chunbin Zou
- 0000 0004 1936 9000grid.21925.3dDepartment of Medicine, University of Pittsburgh, NW628 UPMC Montefiore, 3459 Fifth Avenue, Pittsburgh, PA 15213 USA ,0000 0004 0420 3665grid.413935.9VA Pittsburgh Healthcare System, Pittsburgh, PA USA
| | - Prithu Sundd
- 0000 0004 1936 9000grid.21925.3dVascular Medicine Institute, Department of Medicine, University of Pittsburgh, Pittsburgh, PA USA
| | - Jonathan Alder
- 0000 0004 1936 9000grid.21925.3dDepartment of Medicine, University of Pittsburgh, NW628 UPMC Montefiore, 3459 Fifth Avenue, Pittsburgh, PA 15213 USA
| | - Mauricio Rojas
- 0000 0004 1936 9000grid.21925.3dDepartment of Medicine, University of Pittsburgh, NW628 UPMC Montefiore, 3459 Fifth Avenue, Pittsburgh, PA 15213 USA
| | - Divay Chandra
- 0000 0004 1936 9000grid.21925.3dDepartment of Medicine, University of Pittsburgh, NW628 UPMC Montefiore, 3459 Fifth Avenue, Pittsburgh, PA 15213 USA
| | - Scott Randell
- 0000 0001 1034 1720grid.410711.2Department of Cell and Molecular Physiology, University of North Carolina, Chapel Hill, NC USA
| | - Rama K. Mallampalli
- 0000 0004 1936 9000grid.21925.3dDepartment of Medicine, University of Pittsburgh, NW628 UPMC Montefiore, 3459 Fifth Avenue, Pittsburgh, PA 15213 USA ,0000 0004 0420 3665grid.413935.9VA Pittsburgh Healthcare System, Pittsburgh, PA USA
| | - Yohannes Tesfaigzi
- Lovelace Respiratory Research Institute, COPD program, Albuquerque, NM USA
| | - Tyrone Ryba
- 0000 0004 0504 9575grid.422569.eDivision of Natural Sciences, New College of Florida, Sarasota, FL USA
| | - Toru Nyunoya
- 0000 0004 1936 9000grid.21925.3dDepartment of Medicine, University of Pittsburgh, NW628 UPMC Montefiore, 3459 Fifth Avenue, Pittsburgh, PA 15213 USA ,0000 0004 0420 3665grid.413935.9VA Pittsburgh Healthcare System, Pittsburgh, PA USA
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24
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Guerrina N, Traboulsi H, Eidelman DH, Baglole CJ. The Aryl Hydrocarbon Receptor and the Maintenance of Lung Health. Int J Mol Sci 2018; 19:E3882. [PMID: 30563036 PMCID: PMC6320801 DOI: 10.3390/ijms19123882] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 11/27/2018] [Accepted: 11/29/2018] [Indexed: 01/09/2023] Open
Abstract
Much of what is known about the Aryl Hydrocarbon Receptor (AhR) centers on its ability to mediate the deleterious effects of the environmental toxicant 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD; dioxin). However, the AhR is both ubiquitously-expressed and evolutionarily-conserved, suggesting that it evolved for purposes beyond strictly mediating responses to man-made environmental toxicants. There is growing evidence that the AhR is required for the maintenance of health, as it is implicated in physiological processes such as xenobiotic metabolism, organ development and immunity. Dysregulation of AhR expression and activity is also associated with a variety of disease states, particularly those at barrier organs such as the skin, gut and lungs. The lungs are particularly vulnerable to inhaled toxicants such as cigarette smoke. However, the role of the AhR in diseases such as chronic obstructive pulmonary disease (COPD)-a respiratory illness caused predominately by cigarette smoking-and lung cancer remains largely unexplored. This review will discuss the growing body of literature that provides evidence that the AhR protects the lungs against the damaging effects of cigarette smoke.
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Affiliation(s)
- Necola Guerrina
- Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada.
- Department of Pathology, McGill University, Montreal, QC H3A 2B4, Canada.
| | - Hussein Traboulsi
- Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada.
| | - David H Eidelman
- Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada.
- Department of Medicine, McGill University, Montreal, QC H4A 3J1, Canada.
| | - Carolyn J Baglole
- Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada.
- Department of Pathology, McGill University, Montreal, QC H3A 2B4, Canada.
- Department of Medicine, McGill University, Montreal, QC H4A 3J1, Canada.
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC H3G 1Y6, Canada.
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25
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Abstract
The aging of the human population has resulted in an unprecedented increase in the incidence and prevalence of age-related diseases, including those of the lung. Idiopathic pulmonary fibrosis is a disease of aging, and is characterized by a progressive decline in lung function and high mortality. Recent studies suggest that mitochondrial dysfunction, which can accompany aging phenotypes, may contribute to the pathogenesis of idiopathic pulmonary fibrosis. In this review, we explore current evidence for mitochondrial dysfunction in alveolar epithelial cells, fibroblasts, and immune cells that participate in the fibrotic process. Further, the fates of these cell populations and the potential to target mitochondrial dysfunction as a therapeutic strategy are discussed.
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26
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Lin S, Ren A, Wang L, Huang Y, Wang Y, Wang C, Greene ND. Oxidative Stress and Apoptosis in Benzo[a]pyrene-Induced Neural Tube Defects. Free Radic Biol Med 2018; 116:149-158. [PMID: 29309894 PMCID: PMC5821680 DOI: 10.1016/j.freeradbiomed.2018.01.004] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 12/22/2017] [Accepted: 01/03/2018] [Indexed: 12/20/2022]
Abstract
Neural tube defects (NTDs) are among the most common and severe congenital malformations and result from incomplete closure of the neural tube during early development. Maternal exposure to polycyclic aromatic hydrocarbons (PAHs) has been suggested to be a risk factor for NTDs and previous studies imply that the mechanism underlying the association between PAH exposure and NTDs may involve oxidative stress and apoptosis. The objectives of this study were to investigate whether there is a direct effect of maternal benzo[α] pyrene (BaP) exposure on the closure of the neural tube in mice, and to examine the underlying mechanisms by combining animal experiments and human subject studies. We found that intraperitoneal injection of BaP from embryonic day 7 at a dose of 250 mg kg-1 induced NTDs (13.3% frequency) in ICR mice. BaP exposure significantly increased expression of genes associated with oxidative stress, Cyp1a1, Sod1 and Sod2, while repressing Gpx1. Elevated apoptosis and higher protein expression of cleaved caspase-3 in the neuroepithelium of treated embryos were observed. Pre-treatment with vitamin E, added to food, significantly protected against BaP-induced NTDs (1.4% frequency) (P < 0.05). Vitamin E also partly normalized oxidative stress related gene expression and excess apoptosis in BaP-treated embryos. Examination of human neural tissues revealed that increased levels of protein carbonyl and apoptosis were related with maternal exposure to PAHs and the risk of NTDs. Collectively, these results suggest that BaP exposure could induce NTDs and that this may involve increased oxidative stress and apoptosis, while vitamin E may have a protective effect.
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Affiliation(s)
- Shanshan Lin
- Institute of Reproductive and Child Health, Ministry of Health Key Laboratory of Reproductive Health, and Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Center, Peking University, Beijing, China
| | - Aiguo Ren
- Institute of Reproductive and Child Health, Ministry of Health Key Laboratory of Reproductive Health, and Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Center, Peking University, Beijing, China.
| | - Linlin Wang
- Institute of Reproductive and Child Health, Ministry of Health Key Laboratory of Reproductive Health, and Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Center, Peking University, Beijing, China.
| | - Yun Huang
- Institute of Reproductive and Child Health, Ministry of Health Key Laboratory of Reproductive Health, and Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Center, Peking University, Beijing, China
| | - Yuanyuan Wang
- Institute of Reproductive and Child Health, Ministry of Health Key Laboratory of Reproductive Health, and Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Center, Peking University, Beijing, China
| | - Caiyun Wang
- Institute of Reproductive and Child Health, Ministry of Health Key Laboratory of Reproductive Health, and Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Center, Peking University, Beijing, China
| | - Nicholas D Greene
- Developmental Biology and Cancer Programme, UCL Great Ormond Street Institute of Child Health, University College London, WC1N 1EH, London, United Kingdom
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27
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Towards Targeting the Aryl Hydrocarbon Receptor in Cystic Fibrosis. Mediators Inflamm 2018; 2018:1601486. [PMID: 29670460 PMCID: PMC5835240 DOI: 10.1155/2018/1601486] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 12/05/2017] [Indexed: 01/28/2023] Open
Abstract
Tryptophan (trp) metabolism is an important regulatory component of gut mucosal homeostasis and the microbiome. Metabolic pathways targeting the trp can lead to a myriad of metabolites, of both host and microbial origins, some of which act as endogenous low-affinity ligands for the aryl hydrocarbon receptor (AhR), a cytosolic, ligand-operated transcription factor that is involved in many biological processes, including development, cellular differentiation and proliferation, xenobiotic metabolism, and the immune response. Low-level activation of AhR by endogenous ligands is beneficial in the maintenance of immune health and intestinal homeostasis. We have defined a functional node whereby certain bacteria species contribute to host/microbial symbiosis and mucosal homeostasis. A microbial trp metabolic pathway leading to the production of indole-3-aldehyde (3-IAld) by lactobacilli provided epithelial protection while inducing antifungal resistance via the AhR/IL-22 axis. In this review, we highlight the role of AhR in inflammatory lung diseases and discuss the possible therapeutic use of AhR ligands in cystic fibrosis.
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28
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Low levels of the AhR in chronic obstructive pulmonary disease (COPD)-derived lung cells increases COX-2 protein by altering mRNA stability. PLoS One 2017; 12:e0180881. [PMID: 28749959 PMCID: PMC5531650 DOI: 10.1371/journal.pone.0180881] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 06/22/2017] [Indexed: 11/19/2022] Open
Abstract
Heightened inflammation, including expression of COX-2, is associated with chronic obstructive pulmonary disease (COPD) pathogenesis. The aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor that is reduced in COPD-derived lung fibroblasts. The AhR also suppresses COX-2 in response to cigarette smoke, the main risk factor for COPD, by destabilizing the Cox-2 transcript by mechanisms that may involve the regulation of microRNA (miRNA). Whether reduced AhR expression is responsible for heightened COX-2 in COPD is not known. Here, we investigated the expression of COX-2 as well as the expression of miR-146a, a miRNA known to regulate COX-2 levels, in primary lung fibroblasts derived from non-smokers (Normal) and smokers (At Risk) with and without COPD. To confirm the involvement of the AhR, AhR knock-down via siRNA in Normal lung fibroblasts and MLE-12 cells was employed as were A549-AhRko cells. Basal expression of COX-2 protein was higher in COPD lung fibroblasts compared to Normal or Smoker fibroblasts but there was no difference in Cox-2 mRNA. Knockdown of AhR in lung structural cells increased COX-2 protein by stabilizing the Cox-2 transcript. There was less induction of miR-146a in COPD-derived lung fibroblasts but this was not due to the AhR. Instead, we found that RelB, an NF-κB protein, was required for transcriptional induction of both Cox-2 and miR-146a. Therefore, we conclude that the AhR controls COX-2 protein via mRNA stability by a mechanism independent of miR-146a. Low levels of the AhR may therefore contribute to the heightened inflammation common in COPD patients.
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Colgan SP, Campbell EL, Kominsky DJ. Hypoxia and Mucosal Inflammation. ANNUAL REVIEW OF PATHOLOGY-MECHANISMS OF DISEASE 2017; 11:77-100. [PMID: 27193451 DOI: 10.1146/annurev-pathol-012615-044231] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Sites of inflammation are defined by significant changes in metabolic activity. Recent studies have suggested that O2 metabolism and hypoxia play a prominent role in inflammation so-called "inflammatory hypoxia," which results from a combination of recruited inflammatory cells (e.g., neutrophils and monocytes), the local proliferation of multiple cell types, and the activation of multiple O2-consuming enzymes during inflammation. These shifts in energy supply and demand result in localized regions of hypoxia and have revealed the important function off the transcription factor HIF (hypoxia-inducible factor) in the regulation of key target genes that promote inflammatory resolution. Analysis of these pathways has provided multiple opportunities for understanding basic mechanisms of inflammation and has defined new targets for intervention. Here, we review recent work addressing tissue hypoxia and metabolic control of inflammation and immunity.
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Affiliation(s)
- Sean P Colgan
- Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado 80045; .,Mucosal Inflammation Program, University of Colorado School of Medicine, Aurora, Colorado 80045
| | - Eric L Campbell
- Department of Medicine, University of Colorado School of Medicine, Aurora, Colorado 80045; .,Mucosal Inflammation Program, University of Colorado School of Medicine, Aurora, Colorado 80045
| | - Douglas J Kominsky
- Mucosal Inflammation Program, University of Colorado School of Medicine, Aurora, Colorado 80045.,Department of Microbiology and Immunology, Montana State University, Bozeman, Montana 59717
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Iu M, Zago M, Rico de Souza A, Bouttier M, Pareek S, White JH, Hamid Q, Eidelman DH, Baglole CJ. RelB attenuates cigarette smoke extract-induced apoptosis in association with transcriptional regulation of the aryl hydrocarbon receptor. Free Radic Biol Med 2017; 108:19-31. [PMID: 28254546 DOI: 10.1016/j.freeradbiomed.2017.02.045] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Revised: 02/22/2017] [Accepted: 02/23/2017] [Indexed: 10/20/2022]
Abstract
Chronic obstructive pulmonary disease (COPD) is a chronic and prevalent respiratory disease caused primarily by long term inhalation of cigarette smoke. A major hallmark of COPD is elevated apoptosis of structural lung cells including fibroblasts. The NF-κB member RelB may suppress apoptosis in response to cigarette smoke, but its role in lung cell survival is not known. RelB may act as a pro-survival factor by controlling the expression of superoxide dismutase 2 (SOD2). SOD2 is also regulated by the aryl hydrocarbon receptor (AhR), a ligand-activated transcription factor that suppresses cigarette smoke-induced apoptosis. As the AhR is also a binding partner for RelB, we speculate that RelB suppresses cigarette smoke-induced apoptosis by regulating the AhR. Using an in vitro model of cigarette smoke exposure (cigarette smoke extract [CSE]), we found that CSE down-regulated RelB expression in mouse lung fibroblasts, which was associated with elevated levels of cleaved PARP. Genetic ablation of RelB elevated CSE-induced apoptosis, including chromatin condensation, and reduced mitochondrial function. There was also more reactive oxygen species production in RelB-/- cells exposed to CSE. While there was no alteration in Nrf2 expression or localization between RelB-/- and wild type cells in response to CSE, RelB-/- cells displayed significantly decreased AhR mRNA and protein expression, concomitant with loss of AhR target gene expression (Cyp1a1, Cyp1b1, Nqo1). Finally, we found that RelB binds to the Ahr gene at 3 sites to potentially increase its expression via transcriptional induction. These data support that RelB suppresses cigarette smoke-induced apoptosis, potentially by increasing the AhR. Together, these two proteins may comprise an important cell survival signaling pathway that reduces apoptosis upon cigarette smoke exposure.
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Affiliation(s)
- Matthew Iu
- Department of Medicine, McGill University, Montreal, Quebec, Canada
| | - Michela Zago
- Research Institute of the McGill University Health Centre (RI MUHC), Montreal, Quebec, Canada
| | - Angela Rico de Souza
- Research Institute of the McGill University Health Centre (RI MUHC), Montreal, Quebec, Canada
| | - Manuella Bouttier
- Department of Physiology, McGill University, Montreal, Quebec, Canada
| | - Swati Pareek
- Department of Pathology, McGill University, Montreal, Quebec, Canada
| | - John H White
- Department of Medicine, McGill University, Montreal, Quebec, Canada; Department of Physiology, McGill University, Montreal, Quebec, Canada
| | - Qutayba Hamid
- Department of Medicine, McGill University, Montreal, Quebec, Canada; Department of Pathology, McGill University, Montreal, Quebec, Canada; Research Institute of the McGill University Health Centre (RI MUHC), Montreal, Quebec, Canada
| | - David H Eidelman
- Department of Medicine, McGill University, Montreal, Quebec, Canada; Research Institute of the McGill University Health Centre (RI MUHC), Montreal, Quebec, Canada
| | - Carolyn J Baglole
- Department of Medicine, McGill University, Montreal, Quebec, Canada; Department of Pathology, McGill University, Montreal, Quebec, Canada; Department of Pharmacology & Therapeutics, McGill University, Montreal, Quebec, Canada; Research Institute of the McGill University Health Centre (RI MUHC), Montreal, Quebec, Canada.
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Ranjbar Jafarabadi A, Riyahi Bakhtiari A, Aliabadian M, Shadmehri Toosi A. Spatial distribution and composition of aliphatic hydrocarbons, polycyclic aromatic hydrocarbons and hopanes in superficial sediments of the coral reefs of the Persian Gulf, Iran. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 224:195-223. [PMID: 28216134 DOI: 10.1016/j.envpol.2017.01.080] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 01/16/2017] [Accepted: 01/31/2017] [Indexed: 06/06/2023]
Abstract
This study is the first quantitative report on petroleum biomarkers from the coral reefs systems of the Persian Gulf. 120 reef surface sediment samples from ten fragile coral reef ecosystems were collected and analyzed for grain size, biogenic elements, elemental ratios, and petroleum biomarkers (n-alkanes, PAHs1 and Hopanes) to assess the sources and early diagenesis of sedimentary organic matter. The mean grain size of the reef sediments ranged from 13.56 to 37.11% (Clay), 26.92 to 51.73% (Sand) and 35.97 to 43.85% (Silt). TOC2 (3.35-9.72 mg.g-1) and TON3 (0.4-1.10 mg.g-1) were identified as influencing factors on the accumulation of petroleum hydrocarbons, whilst BC4 (1.08-3.28 mg.g-1) and TIN5 (0.13-0.86) did not exhibit any determining effect. Although BC and TIN demonstrated heterogeneous spatial distribution, TOC and TON indicated homogenous distribution with continually upward trend in concentration from the east to west ward of the Gulf. The mean calculated TOC/TN ratios vacillated according to the stations (p < 0.05) from 2.96 at Shidvar Island to 8.64 at Hengam Island. The high TOC/TN ratios were observed in the Hengam (8.64), Kharg (8.04) and Siri (6.29), respectively, suggesting a predominant marine origin. The mean concentrations of ∑C11-35n-alkanes, ∑30 PAHs and ∑9Hopanes were found in the ranges of 385-937 μg.g-1dw, (overall mean:590 μg.g-1dw), 326-793 ng.g-1dw (499 ng.g-1dw), 88 to 568 ng.g-1 d (258 ng.g-1dw), respectively. Higher concentrations of detected petroleum biomarkers in reef sediments were chiefly distributed near main industrial areas, Kharg, Lavan and Siri, whilst the lower concentrations were in Hormoz and Qeshm. In addition, one-way ANOVA6 analysis demonstrated considerably significant differences (p < 0.05) among concentration of detected total petroleum hydrocarbons between most sampling locations. Some sampling sites especially Kharg, Lavan, Siri and Lark indicated higher concentration of n-alkanes due to the higher maintenance of organic matter by high clay content in the sediments. Furthermore, most sediment samples, except for Hormoz, Qeshm and Hengam showed an even carbon preference for n-alkanes which could be correlated to bacterial input. NPMDS7 analysis also demonstrated that among the congeners of petroleum biomarkers, n-C12,n-C14, n-C16,n-C18 and n-C20 for n-alkanes, Phe8 and Naph9 along with their Alkyl homologues for PAHs (2-3 rings accounted for 60%) and C30αβ and C29αβ for Hopanes were discriminated from their other congeners in the whole study area. Our results based on the PCA10 analysis and diagnostic indices of AHs11 and PAHs along with ring classification of PAHs, in addition, the ubiquitous presence of UCM,12 and Hopanes revealed that the main sources of the pollution were petroleum and petroleum combustion mainly from offshore oil exploration and extraction, discharge of pollutants from shipping activities.
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Affiliation(s)
- Ali Ranjbar Jafarabadi
- Department of Environmental Sciences, Faculty of Natural Resources and Marine Sciences, TarbiatModares University(TMU), Noor, Mazandaran, Iran.
| | - Alireza Riyahi Bakhtiari
- Department of Environmental Sciences, Faculty of Natural Resources and Marine Sciences, TarbiatModares University, Noor, Mazandaran, Iran.
| | - Mansour Aliabadian
- Department of Biology, Faculty of Sciences, Ferdowsi University of Mashhad (FUM), Mashhad, Khorasan Razavi, Iran
| | - Amirhossein Shadmehri Toosi
- Department of Civil & Environmental Engineering, Faculty of Engineering, Ferdowsi University of Mashhad (FUM), Mashhad, Khorasan Razavi, Iran
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Shrestha AK, Patel A, Menon RT, Jiang W, Wang L, Moorthy B, Shivanna B. Leflunomide induces NAD(P)H quinone dehydrogenase 1 enzyme via the aryl hydrocarbon receptor in neonatal mice. Biochem Biophys Res Commun 2017; 485:195-200. [PMID: 28192119 DOI: 10.1016/j.bbrc.2017.02.051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Accepted: 02/09/2017] [Indexed: 01/28/2023]
Abstract
Aryl hydrocarbon receptor (AhR) has been increasingly recognized to play a crucial role in normal physiological homeostasis. Additionally, disrupted AhR signaling leads to several pathological states in the lung and liver. AhR activation transcriptionally induces detoxifying enzymes such as cytochrome P450 (CYP) 1A and NAD(P)H quinone dehydrogenase 1 (NQO1). The toxicity profiles of the classical AhR ligands such as 3-methylcholanthrene and dioxins limit their use as a therapeutic agent in humans. Hence, there is a need to identify nontoxic AhR ligands to develop AhR as a clinically relevant druggable target. Recently, we demonstrated that leflunomide, a FDA approved drug, used to treat rheumatoid arthritis in humans, induces CYP1A enzymes in adult mice via the AhR. However, the mechanisms by which this drug induces NQO1 in vivo are unknown. Therefore, we tested the hypothesis that leflunomide will induce pulmonary and hepatic NQO1 enzyme in neonatal mice via AhR-dependent mechanism(s). Leflunomide elicited significant induction of pulmonary CYP1A1 and NQO1 expression in neonatal mice. Interestingly, the dose at which leflunomide increased NQO1 was significantly higher than that required to induce CYP1A1 enzyme. Likewise, it also enhanced hepatic CYP1A1, 1A2 and NQO1 expression in WT mice. In contrast, leflunomide failed to induce these enzymes in AhR-null mice. Our results indicate that leflunomide induces pulmonary and hepatic CYP1A and NQO1 enzymes via the AhR in neonatal mice. These findings have important implications to prevent and/or treat disorders such as bronchopulmonary dysplasia in human infants where AhR may play a crucial role in the disease pathogenesis.
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Affiliation(s)
- Amrit Kumar Shrestha
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Ananddeep Patel
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Renuka T Menon
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Weiwu Jiang
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Lihua Wang
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Bhagavatula Moorthy
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Binoy Shivanna
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX, 77030, USA.
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Rogers S, de Souza AR, Zago M, Iu M, Guerrina N, Gomez A, Matthews J, Baglole CJ. Aryl hydrocarbon receptor (AhR)-dependent regulation of pulmonary miRNA by chronic cigarette smoke exposure. Sci Rep 2017; 7:40539. [PMID: 28079158 PMCID: PMC5227990 DOI: 10.1038/srep40539] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Accepted: 12/07/2016] [Indexed: 01/04/2023] Open
Abstract
The aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor historically known for its toxic responses to man-made pollutants such as dioxin. More recently, the AhR has emerged as a suppressor of inflammation, oxidative stress and apoptosis from cigarette smoke by mechanisms that may involve the regulation of microRNA. However, little is known about the AhR regulation of miRNA expression in the lung in response to inhaled toxicants. Therefore, we exposed Ahr−/− and Ahr+/− mice to cigarette smoke for 4 weeks and evaluated lung miRNA expression by PCR array. There was a dramatic regulation of lung miRNA by the AhR in the absence of exogenous ligand. In response to cigarette smoke, there were more up-regulated miRNA in Ahr−/− mice compared to Ahr+/− mice, including the cancer-associated miRNA miR-96. There was no significant change in the expression of the AhR regulated proteins HuR and cyclooxygenase-2 (COX-2). There were significant increases in the anti-oxidant gene sulfiredoxin 1 (Srxn1) and FOXO3a- predicted targets of miR-96. Collectively, these data support a prominent role for the AhR in regulating lung miRNA expression. Further studies to elucidate a role for these miRNA may further uncover novel biological function for the AhR in respiratory health and disease.
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Affiliation(s)
- Sarah Rogers
- Departments of Medicine, McGill University, Montreal, Quebec, Canada
| | - Angela Rico de Souza
- Research Institute of the McGill University Health Centre (RI-MUHC), Meakins-Christie Laboratories, Montreal, QC, Canada
| | - Michela Zago
- Departments of Pharmacology &Therapeutics, McGill University, Montreal, Quebec, Canada
| | - Matthew Iu
- Departments of Medicine, McGill University, Montreal, Quebec, Canada
| | - Necola Guerrina
- Departments of Pathology, McGill University, Montreal, Quebec, Canada
| | - Alvin Gomez
- Department of Pharmacology &Toxicology, University of Toronto, Toronto, Ontario, Canada
| | - Jason Matthews
- Department of Pharmacology &Toxicology, University of Toronto, Toronto, Ontario, Canada.,Department of Nutrition, University of Oslo, Oslo, Norway
| | - Carolyn J Baglole
- Departments of Medicine, McGill University, Montreal, Quebec, Canada.,Research Institute of the McGill University Health Centre (RI-MUHC), Meakins-Christie Laboratories, Montreal, QC, Canada.,Departments of Pharmacology &Therapeutics, McGill University, Montreal, Quebec, Canada.,Departments of Pathology, McGill University, Montreal, Quebec, Canada
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34
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Białas AJ, Sitarek P, Miłkowska-Dymanowska J, Piotrowski WJ, Górski P. The Role of Mitochondria and Oxidative/Antioxidative Imbalance in Pathobiology of Chronic Obstructive Pulmonary Disease. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:7808576. [PMID: 28105251 PMCID: PMC5220474 DOI: 10.1155/2016/7808576] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Accepted: 10/23/2016] [Indexed: 12/12/2022]
Abstract
Chronic obstructive pulmonary disease (COPD) is a common preventable and treatable disease, characterized by persistent airflow limitation that is usually progressive and associated with an enhanced chronic inflammatory response in the airways and the lung to noxious particles or gases. The major risk factor of COPD, which has been proven in many studies, is the exposure to cigarette smoke. However, it is 15-20% of all smokers who develop COPD. This is why we should recognize the pathobiology of COPD as involving a complex interaction between several factors, including genetic vulnerability. Oxidant-antioxidant imbalance is recognized as one of the significant factors in COPD pathogenesis. Numerous exogenous and endogenous sources of ROS are present in pathobiology of COPD. One of endogenous sources of ROS is mitochondria. Although leakage of electrons from electron transport chain and forming of ROS are the effect of physiological functioning of mitochondria, there are various intra- and extracellular factors which may increase this amount and significantly contribute to oxidative-antioxidative imbalance. With the coexistence with impaired antioxidant defence, all these issues lead to oxidative and carbonyl stress. Both of these states play a significant role in pathobiology of COPD and may account for development of major comorbidities of this disease.
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Affiliation(s)
- Adam Jerzy Białas
- Department of Pneumology and Allergy, 1st Chair of Internal Medicine, Medical University of Lodz, Łódź, Poland
- Healthy Aging Research Centre (HARC), Medical University of Lodz, Łódź, Poland
| | - Przemysław Sitarek
- Department of Biology and Pharmaceutical Botany, Medical University of Łódź, Łódź, Poland
| | - Joanna Miłkowska-Dymanowska
- Department of Pneumology and Allergy, 1st Chair of Internal Medicine, Medical University of Lodz, Łódź, Poland
- Healthy Aging Research Centre (HARC), Medical University of Lodz, Łódź, Poland
| | - Wojciech Jerzy Piotrowski
- Department of Pneumology and Allergy, 1st Chair of Internal Medicine, Medical University of Lodz, Łódź, Poland
- Healthy Aging Research Centre (HARC), Medical University of Lodz, Łódź, Poland
| | - Paweł Górski
- Department of Pneumology and Allergy, 1st Chair of Internal Medicine, Medical University of Lodz, Łódź, Poland
- Healthy Aging Research Centre (HARC), Medical University of Lodz, Łódź, Poland
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35
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Roussel L, LaFayette S, Nguyen D, Baglole CJ, Rousseau S. Differential Contribution of the Aryl-Hydrocarbon Receptor and Toll-Like Receptor Pathways to IL-8 Expression in Normal and Cystic Fibrosis Airway Epithelial Cells Exposed to Pseudomonas aeruginosa. Front Cell Dev Biol 2016; 4:148. [PMID: 28066767 PMCID: PMC5177610 DOI: 10.3389/fcell.2016.00148] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 12/13/2016] [Indexed: 01/05/2023] Open
Abstract
Pseudomonas aeruginosa are gram-negative bacteria that frequently infect the lungs of cystic fibrosis (CF) patients. This bacterium is highly responsive to changes in its environment, resulting in the expression of a diverse array of genes that may contribute to the host inflammatory response. P. aeruginosa is well-known to induce neutrophilic inflammation via the activation of Toll-Like Receptors (TLRs). Recently, it was shown that pyocyanin, a phenazine produced by P. aeruginosa, binds to the aryl hydrocarbon receptor (AhR), leading to neutrophilic inflammation as part of the host defense response. In this study, we have investigated the contribution of the TLR and AhR signaling pathways to the expression of the neutrophil chemoattractant IL-8 in response to P. aeruginosa diffusible material. Although both pathways are involved in IL-8 synthesis, the AhR played a greater role when planktonic P. aeruginosa was grown in a media favoring phenazine synthesis. However, when P. aeruginosa was grown in a media that mimics the nutritional composition of CF sputa, both pathways contributed similarly to IL-8 synthesis. Finally, when P. aeruginosa was grown as a biofilm, the TLR pathway did not contribute to biofilm-driven IL-8 synthesis and AhR was found to only partially contribute to IL-8 synthesis, suggesting the contribution of another unknown signaling pathway. Therefore, the interaction between P. aeruginosa and airway epithelial cells is very dynamic, and sensor engagement is variable according to the adaptation of P. aeruginosa to the CF lung environment.
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Affiliation(s)
- Lucie Roussel
- Meakins-Christie Laboratories, Department of Medicine, McGill University, McGill University Health Centre Research Institute Montreal, QC, Canada
| | - Shantelle LaFayette
- Meakins-Christie Laboratories, Department of Medicine, McGill University, McGill University Health Centre Research Institute Montreal, QC, Canada
| | - Dao Nguyen
- Meakins-Christie Laboratories, Department of Medicine, McGill University, McGill University Health Centre Research Institute Montreal, QC, Canada
| | - Carolyn J Baglole
- Meakins-Christie Laboratories, Department of Medicine, McGill University, McGill University Health Centre Research Institute Montreal, QC, Canada
| | - Simon Rousseau
- Meakins-Christie Laboratories, Department of Medicine, McGill University, McGill University Health Centre Research Institute Montreal, QC, Canada
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Patel A, Zhang S, Shrestha AK, Maturu P, Moorthy B, Shivanna B. Omeprazole induces heme oxygenase-1 in fetal human pulmonary microvascular endothelial cells via hydrogen peroxide-independent Nrf2 signaling pathway. Toxicol Appl Pharmacol 2016; 311:26-33. [PMID: 27725188 PMCID: PMC5089963 DOI: 10.1016/j.taap.2016.10.002] [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] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 09/24/2016] [Accepted: 10/05/2016] [Indexed: 12/25/2022]
Abstract
Omeprazole (OM) is an aryl hydrocarbon receptor (AhR) agonist and a proton pump inhibitor that is used to treat humans with gastric acid related disorders. Recently, we showed that OM induces NAD (P) H quinone oxidoreductase-1 (NQO1) via nuclear factor erythroid 2-related factor 2 (Nrf2)-dependent mechanism. Heme oxygenase-1 (HO-1) is another cytoprotective and antioxidant enzyme that is regulated by Nrf2. Whether OM induces HO-1 in fetal human pulmonary microvascular endothelial cells (HPMEC) is unknown. Therefore, we tested the hypothesis that OM will induce HO-1 expression via Nrf2 in HPMEC. OM induced HO-1 mRNA and protein expression in a dose-dependent manner. siRNA-mediated knockdown of AhR failed to abrogate, whereas knockdown of Nrf2 abrogated HO-1 induction by OM. To identify the underlying molecular mechanisms, we determined the effects of OM on cellular hydrogen peroxide (H2O2) levels since oxidative stress mediated by the latter is known to activate Nrf2. Interestingly, the concentration at which OM induced HO-1 also increased H2O2 levels. Furthermore, H2O2 independently augmented HO-1 expression. Although N-acetyl cysteine (NAC) significantly decreased H2O2 levels in OM-treated cells, we observed that OM further increased HO-1 mRNA and protein expression in NAC-pretreated compared to vehicle-pretreated cells, suggesting that OM induces HO-1 via H2O2-independent mechanisms. In conclusion, we provide evidence that OM transcriptionally induces HO-1 via AhR - and H2O2 - independent, but Nrf2 - dependent mechanisms. These results have important implications for human disorders where Nrf2 and HO-1 play a beneficial role.
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Affiliation(s)
- Ananddeep Patel
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, United States
| | - Shaojie Zhang
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, United States
| | - Amrit Kumar Shrestha
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, United States
| | - Paramahamsa Maturu
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, United States
| | - Bhagavatula Moorthy
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, United States
| | - Binoy Shivanna
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030, United States.
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Antioxidant Functions of the Aryl Hydrocarbon Receptor. Stem Cells Int 2016; 2016:7943495. [PMID: 27829840 PMCID: PMC5088273 DOI: 10.1155/2016/7943495] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 09/07/2016] [Indexed: 01/01/2023] Open
Abstract
The aryl hydrocarbon receptor (AhR) is a transcription factor belonging to the basic helix-loop-helix/PER-ARNT-SIM family. It is activated by a variety of ligands, such as environmental contaminants like polycyclic aromatic hydrocarbons or dioxins, but also by naturally occurring compounds and endogenous ligands. Binding of the ligand leads to dimerization of the AhR with aryl hydrocarbon receptor nuclear translocator (ARNT) and transcriptional activation of several xenobiotic phase I and phase II metabolizing enzymes. It is generally accepted that the toxic responses of polycyclic aromatic hydrocarbons, dioxins, and structurally related compounds are mediated by activation of the AhR. A multitude of studies indicate that the AhR operates beyond xenobiotic metabolism and exerts pleiotropic functions. Increasing evidence points to a protective role of the AhR against carcinogenesis and oxidative stress. Herein, I will highlight data demonstrating a causal role of the AhR in the antioxidant response and present novel findings on potential AhR-mediated antioxidative mechanisms.
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38
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Li X, Zhang Y, Liang Y, Cui Y, Yeung SC, Ip MSM, Tse HF, Lian Q, Mak JCW. iPSC-derived mesenchymal stem cells exert SCF-dependent recovery of cigarette smoke-induced apoptosis/proliferation imbalance in airway cells. J Cell Mol Med 2016; 21:265-277. [PMID: 27641240 PMCID: PMC5264148 DOI: 10.1111/jcmm.12962] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 07/29/2016] [Indexed: 01/08/2023] Open
Abstract
Mesenchymal stem cells (MSCs) have emerged as a potential cell‐based therapy for pulmonary emphysema in animal models. Our previous study demonstrated that human induced pluripotent stem cell–derived MSCs (iPSC‐MSCs) were superior over bone marrow–derived MSCs (BM‐MSCs) in attenuating cigarette smoke (CS)‐induced airspace enlargement possibly through mitochondrial transfer. This study further investigated the effects of iPSC‐MSCs on inflammation, apoptosis, and proliferation in a CS‐exposed rat model and examined the effects of the secreted paracrine factor from MSCs as another possible mechanism in an in vitro model of bronchial epithelial cells. Rats were exposed to 4% CS for 1 hr daily for 56 days. At days 29 and 43, human iPSC‐MSCs or BM‐MSCs were administered intravenously. We observed significant attenuation of CS‐induced elevation of circulating 8‐isoprostane and cytokine‐induced neutrophil chemoattractant‐1 after iPSC‐MSC treatment. In line, a superior capacity of iPSC‐MSCs was also observed in ameliorating CS‐induced infiltration of macrophages and neutrophils and apoptosis/proliferation imbalance in lung sections over BM‐MSCs. In support, the conditioned medium (CdM) from iPSC‐MSCs ameliorated CS medium‐induced apoptosis/proliferation imbalance of bronchial epithelial cells in vitro. Conditioned medium from iPSC‐MSCs contained higher level of stem cell factor (SCF) than that from BM‐MSCs. Deprivation of SCF from iPSC‐MSC‐derived CdM led to a reduction in anti‐apoptotic and pro‐proliferative capacity. Taken together, our data suggest that iPSC‐MSCs may possess anti‐apoptotic/pro‐proliferative capacity in the in vivo and in vitro models of CS‐induced airway cell injury partly through paracrine secretion of SCF.
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Affiliation(s)
- Xiang Li
- Department of Medicine, The University of Hong Kong, Hong Kong
| | - Yuelin Zhang
- Department of Medicine, The University of Hong Kong, Hong Kong.,Department of Ophthalmology, The University of Hong Kong, Hong Kong
| | - Yingmin Liang
- Department of Medicine, The University of Hong Kong, Hong Kong
| | - Yuting Cui
- Department of Medicine, The University of Hong Kong, Hong Kong
| | - Sze C Yeung
- Department of Medicine, The University of Hong Kong, Hong Kong
| | - Mary S M Ip
- Department of Medicine, The University of Hong Kong, Hong Kong.,Research Centre of Heart, Brain, Hormone and Healthy Aging, The University of Hong Kong, Hong Kong
| | - Hung-Fat Tse
- Department of Medicine, The University of Hong Kong, Hong Kong
| | - Qizhou Lian
- Department of Medicine, The University of Hong Kong, Hong Kong.,Department of Ophthalmology, The University of Hong Kong, Hong Kong.,Research Centre of Heart, Brain, Hormone and Healthy Aging, The University of Hong Kong, Hong Kong.,Shenzhen Institute of Research and Innovation, The University of Hong Kong, Hong Kong
| | - Judith C W Mak
- Department of Medicine, The University of Hong Kong, Hong Kong.,Research Centre of Heart, Brain, Hormone and Healthy Aging, The University of Hong Kong, Hong Kong.,Shenzhen Institute of Research and Innovation, The University of Hong Kong, Hong Kong.,Department of Pharmacology & Pharmacy, The University of Hong Kong, Hong Kong
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39
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Ren L, Thompson JD, Cheung M, Ngo K, Sung S, Leong S, Chan WK. Selective suppression of the human aryl hydrocarbon receptor function can be mediated through binding interference at the C-terminal half of the receptor. Biochem Pharmacol 2016; 107:91-100. [PMID: 26970402 DOI: 10.1016/j.bcp.2016.03.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 03/07/2016] [Indexed: 11/26/2022]
Abstract
The human aryl hydrocarbon receptor is a cytosolic signaling molecule which affects immune response and aberrant cell growth. Canonical signaling of the receptor requires the recruitment of coactivators to the promoter region to remodel local chromatin structure. We predicted that interference of this recruitment would block the aryl hydrocarbon receptor function. To prove that, we employed phage display to identify nine peptides of twelve-amino-acid in length which target the C-terminal half of the human aryl hydrocarbon receptor, including the region where coactivators bind. Eight 12mer peptides, in the form of GFP fusion, suppressed the ligand-dependent transcription of six AHR target genes (cyp1a1, cyp1a2, cyp1b1, ugt1a1, nqo1, and ahrr) in different patterns in Hep3B cells, whereas the AHR antagonist CH-223191 suppressed all these target genes similarly. Three of the 12mer peptides (namely 11-3, 1-7, and 7-3) suppressed the 3MC-induced, CYP1A1-dependent EROD activity and the ROS production caused by benzo[a]pyrene. These 12mer peptides suppressed the AHR function synergistically with CH-223191. In conclusion, we provide evidence that targeting the C-terminal half of the human aryl hydrocarbon receptor is a viable, new approach to selectively block the receptor function.
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Affiliation(s)
- Lina Ren
- Harbin Center for Disease Control and Prevention, Harbin, China
| | - John D Thompson
- Department of Pharmaceutics & Medicinal Chemistry, Thomas J. Long School of Pharmacy & Health Sciences, University of the Pacific, Stockton, CA 95211, United States
| | - Michael Cheung
- Department of Pharmaceutics & Medicinal Chemistry, Thomas J. Long School of Pharmacy & Health Sciences, University of the Pacific, Stockton, CA 95211, United States
| | - Katherine Ngo
- Department of Pharmaceutics & Medicinal Chemistry, Thomas J. Long School of Pharmacy & Health Sciences, University of the Pacific, Stockton, CA 95211, United States
| | - Sarah Sung
- Department of Pharmaceutics & Medicinal Chemistry, Thomas J. Long School of Pharmacy & Health Sciences, University of the Pacific, Stockton, CA 95211, United States
| | - Scott Leong
- Department of Pharmaceutics & Medicinal Chemistry, Thomas J. Long School of Pharmacy & Health Sciences, University of the Pacific, Stockton, CA 95211, United States
| | - William K Chan
- Department of Pharmaceutics & Medicinal Chemistry, Thomas J. Long School of Pharmacy & Health Sciences, University of the Pacific, Stockton, CA 95211, United States.
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40
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Affiliation(s)
- P Esakky
- Department of Veterans Affairs Medical Center, St. Louis, MO, USA
- Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO, USA
| | - K H Moley
- Department of Veterans Affairs Medical Center, St. Louis, MO, USA
- Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO, USA
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41
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Faust D, Nikolova T, Wätjen W, Kaina B, Dietrich C. The Brassica-derived phytochemical indolo[3,2-b]carbazole protects against oxidative DNA damage by aryl hydrocarbon receptor activation. Arch Toxicol 2016; 91:967-982. [DOI: 10.1007/s00204-016-1672-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 01/19/2016] [Indexed: 12/31/2022]
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42
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Giordano L, Deceglie S, d'Adamo P, Valentino ML, La Morgia C, Fracasso F, Roberti M, Cappellari M, Petrosillo G, Ciaravolo S, Parente D, Giordano C, Maresca A, Iommarini L, Del Dotto V, Ghelli AM, Salomao SR, Berezovsky A, Belfort R, Sadun AA, Carelli V, Loguercio Polosa P, Cantatore P. Cigarette toxicity triggers Leber's hereditary optic neuropathy by affecting mtDNA copy number, oxidative phosphorylation and ROS detoxification pathways. Cell Death Dis 2015; 6:e2021. [PMID: 26673666 PMCID: PMC4720897 DOI: 10.1038/cddis.2015.364] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 11/04/2015] [Accepted: 11/05/2015] [Indexed: 01/15/2023]
Abstract
Leber's hereditary optic neuropathy (LHON), the most frequent mitochondrial disease, is associated with mitochondrial DNA (mtDNA) point mutations affecting Complex I subunits, usually homoplasmic. This blinding disorder is characterized by incomplete penetrance, possibly related to several genetic modifying factors. We recently reported that increased mitochondrial biogenesis in unaffected mutation carriers is a compensatory mechanism, which reduces penetrance. Also, environmental factors such as cigarette smoking have been implicated as disease triggers. To investigate this issue further, we first assessed the relationship between cigarette smoke and mtDNA copy number in blood cells from large cohorts of LHON families, finding that smoking was significantly associated with the lowest mtDNA content in affected individuals. To unwrap the mechanism of tobacco toxicity in LHON, we exposed fibroblasts from affected individuals, unaffected mutation carriers and controls to cigarette smoke condensate (CSC). CSC decreased mtDNA copy number in all cells; moreover, it caused significant reduction of ATP level only in mutated cells including carriers. This implies that the bioenergetic compensation in carriers is hampered by exposure to smoke derivatives. We also observed that in untreated cells the level of carbonylated proteins was highest in affected individuals, whereas the level of several detoxifying enzymes was highest in carriers. Thus, carriers are particularly successful in reactive oxygen species (ROS) scavenging capacity. After CSC exposure, the amount of detoxifying enzymes increased in all cells, but carbonylated proteins increased only in LHON mutant cells, mostly from affected individuals. All considered, it appears that exposure to smoke derivatives has a more deleterious effect in affected individuals, whereas carriers are the most efficient in mitigating ROS rather than recovering bioenergetics. Therefore, the identification of genetic modifiers that modulate LHON penetrance must take into account also the exposure to environmental triggers such as tobacco smoke.
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MESH Headings
- DNA, Mitochondrial/genetics
- DNA, Mitochondrial/metabolism
- Female
- Humans
- Male
- Optic Atrophy, Hereditary, Leber/etiology
- Optic Atrophy, Hereditary, Leber/genetics
- Optic Atrophy, Hereditary, Leber/metabolism
- Optic Atrophy, Hereditary, Leber/pathology
- Oxidative Phosphorylation
- Reactive Oxygen Species/metabolism
- Smoking/adverse effects
- Smoking/genetics
- Smoking/metabolism
- Smoking/pathology
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Affiliation(s)
- L Giordano
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - S Deceglie
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - P d'Adamo
- Department of Reproductive Sciences, Medical Genetics, Development and Public Health, University of Trieste, Trieste, Italy
- IRCCS-Burlo Garofolo Children Hospital, Trieste, Italy
| | - M L Valentino
- IRCCS Institute of Neurological Sciences of Bologna, Bellaria Hospital, Bologna, Italy
- Department of Biomedical and NeuroMotor Sciences (DIBINEM), Neurology Unit, University of Bologna, Bologna, Italy
| | - C La Morgia
- IRCCS Institute of Neurological Sciences of Bologna, Bellaria Hospital, Bologna, Italy
- Department of Biomedical and NeuroMotor Sciences (DIBINEM), Neurology Unit, University of Bologna, Bologna, Italy
| | - F Fracasso
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - M Roberti
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - M Cappellari
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - G Petrosillo
- Institute of Biomembranes and Bioenergetics (IBBE) National Research Council (CNR), Bari, Italy
| | - S Ciaravolo
- Vectis s.r.l. Cava dei Tirreni (Salerno), Italy
| | - D Parente
- Vectis s.r.l. Cava dei Tirreni (Salerno), Italy
| | - C Giordano
- Department of Radiological, Oncological and Pathological Sciences, Sapienza University of Rome, Rome, Italy
| | - A Maresca
- IRCCS Institute of Neurological Sciences of Bologna, Bellaria Hospital, Bologna, Italy
- Department of Biomedical and NeuroMotor Sciences (DIBINEM), Neurology Unit, University of Bologna, Bologna, Italy
| | - L Iommarini
- IRCCS Institute of Neurological Sciences of Bologna, Bellaria Hospital, Bologna, Italy
- Department of Biomedical and NeuroMotor Sciences (DIBINEM), Neurology Unit, University of Bologna, Bologna, Italy
| | - V Del Dotto
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - A M Ghelli
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - S R Salomao
- Department of Ophthalmology, and Visual Sciences, Paulista School of Medicine Federal University of Sao Paulo—UNIFESP, Sao Paulo, Brazil
| | - A Berezovsky
- Department of Ophthalmology, and Visual Sciences, Paulista School of Medicine Federal University of Sao Paulo—UNIFESP, Sao Paulo, Brazil
| | - R Belfort
- Department of Ophthalmology, and Visual Sciences, Paulista School of Medicine Federal University of Sao Paulo—UNIFESP, Sao Paulo, Brazil
| | - A A Sadun
- Doheny Eye Institute, University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - V Carelli
- IRCCS Institute of Neurological Sciences of Bologna, Bellaria Hospital, Bologna, Italy
- Department of Biomedical and NeuroMotor Sciences (DIBINEM), Neurology Unit, University of Bologna, Bologna, Italy
| | - P Loguercio Polosa
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
| | - P Cantatore
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Bari, Italy
- Institute of Biomembranes and Bioenergetics (IBBE) National Research Council (CNR), Bari, Italy
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43
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Sarill M, Zago M, Sheridan JA, Nair P, Matthews J, Gomez A, Roussel L, Rousseau S, Hamid Q, Eidelman DH, Baglole CJ. The aryl hydrocarbon receptor suppresses cigarette-smoke-induced oxidative stress in association with dioxin response element (DRE)-independent regulation of sulfiredoxin 1. Free Radic Biol Med 2015; 89:342-57. [PMID: 26408075 DOI: 10.1016/j.freeradbiomed.2015.08.007] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 08/10/2015] [Accepted: 08/11/2015] [Indexed: 01/13/2023]
Abstract
The aryl hydrocarbon receptor (AhR) is a ubiquitously expressed receptor/transcription factor that mediates toxicological responses of environmental contaminants such as 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). Emerging evidence indicates that the AhR suppresses apoptosis and proliferation independent of exogenous ligands, including suppression of apoptosis by cigarette smoke, a key risk factor for chronic obstructive pulmonary disease (COPD). As cigarette smoke is a potent inducer of oxidative stress, a feature that may contribute to the development of COPD, we hypothesized that the AhR prevents smoke-induced apoptosis by regulating oxidative stress. Utilizing primary lung fibroblasts derived from AhR(+/+) and AhR(-/-) mice as well as A549 human lung adenocarcinoma cells deficient in AhR expression (A549-AhR(ko)), we first show that AhR(-/-) fibroblasts and A549-AhR(ko) epithelial cells have a significant increase in cigarette smoke extract (CSE)-induced oxidative stress compared to wild type. CSE induced a significant increase in the mRNA expression of key antioxidant genes, including Nqo1 and Srxn1, predominantly in AhR(+/+) fibroblasts, with significantly less induction in AhR(-/-) cells. The induction of Srxn1, but not Nqo1, was independent of dioxin-response element (DRE) binding as AhR(DBD/DBD) lung fibroblasts, which express an AhR incapable of binding the DRE, increased Srxn1 to a degree similar to wild-type cells in response to CSE. There was no difference in Nrf2 expression or activation based on AhR expression. Lung fibroblasts derived from COPD subjects have significantly less AhR protein expression compared with both never-smokers (Normal) and smokers (At Risk). Consequently, COPD-derived fibroblasts were less robust in their induction of both Nqo1 and Srxn1 mRNA after exposure to CSE, which also failed to activate the AhR in the COPD fibroblasts. Taken together, these results support a new role for the AhR in regulating antioxidant defense in lung structural cells, such that low AhR expression may facilitate the development or progression of COPD.
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Affiliation(s)
- Miles Sarill
- Department of Medicine, Division of Experimental Medicine
| | - Michela Zago
- Research Institute of the McGill University Health Centre, McGill University, Centre for Translational Biology (CTB), Block E, 1001 Decarie Blvd., Montreal, QC H4A 3J1, Canada
| | | | | | - Jason Matthews
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON, Canada
| | - Alvin Gomez
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, ON, Canada
| | - Lucie Roussel
- Research Institute of the McGill University Health Centre, McGill University, Centre for Translational Biology (CTB), Block E, 1001 Decarie Blvd., Montreal, QC H4A 3J1, Canada
| | - Simon Rousseau
- Research Institute of the McGill University Health Centre, McGill University, Centre for Translational Biology (CTB), Block E, 1001 Decarie Blvd., Montreal, QC H4A 3J1, Canada
| | - Qutayba Hamid
- Department of Medicine, Division of Experimental Medicine; Research Institute of the McGill University Health Centre, McGill University, Centre for Translational Biology (CTB), Block E, 1001 Decarie Blvd., Montreal, QC H4A 3J1, Canada
| | - David H Eidelman
- Department of Medicine, Division of Experimental Medicine; Research Institute of the McGill University Health Centre, McGill University, Centre for Translational Biology (CTB), Block E, 1001 Decarie Blvd., Montreal, QC H4A 3J1, Canada
| | - Carolyn J Baglole
- Department of Medicine, Division of Experimental Medicine; Research Institute of the McGill University Health Centre, McGill University, Centre for Translational Biology (CTB), Block E, 1001 Decarie Blvd., Montreal, QC H4A 3J1, Canada.
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Barr T, Girke T, Sureshchandra S, Nguyen C, Grant K, Messaoudi I. Alcohol Consumption Modulates Host Defense in Rhesus Macaques by Altering Gene Expression in Circulating Leukocytes. THE JOURNAL OF IMMUNOLOGY 2015; 196:182-95. [PMID: 26621857 DOI: 10.4049/jimmunol.1501527] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Accepted: 10/30/2015] [Indexed: 12/25/2022]
Abstract
Several lines of evidence indicate that chronic alcohol use disorder leads to increased susceptibility to several viral and bacterial infections, whereas moderate alcohol consumption decreases the incidence of colds and improves immune responses to some pathogens. In line with these observations, we recently showed that heavy ethanol intake (average blood ethanol concentrations > 80 mg/dl) suppressed, whereas moderate alcohol consumption (blood ethanol concentrations < 50 mg/dl) enhanced, T and B cell responses to modified vaccinia Ankara vaccination in a nonhuman primate model of voluntary ethanol consumption. To uncover the molecular basis for impaired immunity with heavy alcohol consumption and enhanced immune response with moderate alcohol consumption, we performed a transcriptome analysis using PBMCs isolated on day 7 post-modified vaccinia Ankara vaccination, the earliest time point at which we detected differences in T cell and Ab responses. Overall, chronic heavy alcohol consumption reduced the expression of immune genes involved in response to infection and wound healing and increased the expression of genes associated with the development of lung inflammatory disease and cancer. In contrast, chronic moderate alcohol consumption upregulated the expression of genes involved in immune response and reduced the expression of genes involved in cancer. To uncover mechanisms underlying the alterations in PBMC transcriptomes, we profiled the expression of microRNAs within the same samples. Chronic heavy ethanol consumption altered the levels of several microRNAs involved in cancer and immunity and known to regulate the expression of mRNAs differentially expressed in our data set.
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Affiliation(s)
- Tasha Barr
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA 92521
| | - Thomas Girke
- Institute of Integrative Genome Biology, University of California, Riverside, Riverside, CA 92521; and
| | - Suhas Sureshchandra
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA 92521
| | - Christina Nguyen
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA 92521
| | - Kathleen Grant
- Division of Neurosciences, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR 97006
| | - Ilhem Messaoudi
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA 92521;
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45
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Xu T, Zhou Y, Qiu L, Do DC, Zhao Y, Cui Z, Wang H, Liu X, Saradna A, Cao X, Wan M, Gao P. Aryl Hydrocarbon Receptor Protects Lungs from Cockroach Allergen-Induced Inflammation by Modulating Mesenchymal Stem Cells. THE JOURNAL OF IMMUNOLOGY 2015; 195:5539-50. [PMID: 26561548 DOI: 10.4049/jimmunol.1501198] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 10/19/2015] [Indexed: 12/19/2022]
Abstract
Exposure to cockroach allergen leads to allergic sensitization and increased risk of developing asthma. Aryl hydrocarbon receptor (AhR), a receptor for many common environmental contaminants, can sense not only environmental pollutants but also microbial insults. Mesenchymal stem cells (MSCs) are multipotent progenitor cells with the capacity to modulate immune responses. In this study, we investigated whether AhR can sense cockroach allergens and modulate allergen-induced lung inflammation through MSCs. We found that cockroach allergen-treated AhR-deficient (AhR(-/-)) mice showed exacerbation of lung inflammation when compared with wild-type (WT) mice. In contrast, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), an AhR agonist, significantly suppressed allergen-induced mouse lung inflammation. MSCs were significantly reduced in cockroach allergen-challenged AhR(-/-) mice as compared with WT mice, but increased in cockroach allergen-challenged WT mice when treated with TCDD. Moreover, MSCs express AhR, and AhR signaling can be activated by cockroach allergen with increased expression of its downstream genes cyp1a1 and cyp1b1. Furthermore, we tracked the migration of i.v.-injected GFP(+) MSCs and found that cockroach allergen-challenged AhR(-/-) mice displayed less migration of MSCs to the lungs compared with WT. The AhR-mediated MSC migration was further verified by an in vitro Transwell migration assay. Epithelial conditioned medium prepared from cockroach extract-challenged epithelial cells significantly induced MSC migration, which was further enhanced by TCDD. The administration of MSCs significantly attenuated cockroach allergen-induced inflammation, which was abolished by TGF-β1-neutralizing Ab. These results suggest that AhR plays an important role in protecting lungs from allergen-induced inflammation by modulating MSC recruitment and their immune-suppressive activity.
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Affiliation(s)
- Ting Xu
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD 21224; Department of Sleep Medicine Center, Nanfang Hospital, Southern Medical University, Guangzhou 510515, People's Republic of China; and
| | - Yufeng Zhou
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD 21224
| | - Lipeng Qiu
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD 21224
| | - Danh C Do
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD 21224
| | - Yilin Zhao
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD 21224
| | - Zhuang Cui
- Department of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21224
| | - Heng Wang
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD 21224
| | - Xiaopeng Liu
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD 21224
| | - Arjun Saradna
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD 21224
| | - Xu Cao
- Department of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21224
| | - Mei Wan
- Department of Orthopedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21224
| | - Peisong Gao
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD 21224;
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46
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Esakky P, Hansen DA, Drury AM, Cusumano A, Moley KH. Cigarette smoke-induced cell death of a spermatocyte cell line can be prevented by inactivating the Aryl hydrocarbon receptor. Cell Death Discov 2015; 1:15050. [PMID: 27551479 PMCID: PMC4979462 DOI: 10.1038/cddiscovery.2015.50] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Revised: 09/10/2015] [Accepted: 09/12/2015] [Indexed: 11/29/2022] Open
Abstract
Cigarette smoke exposure causes germ cell death during spermatogenesis. Our earlier studies demonstrated that cigarette smoke condensate (CSC) causes spermatocyte cell death in vivo and growth arrest of the mouse spermatocyte cell line (GC-2spd(ts)) in vitro via the aryl hydrocarbon receptor (AHR). We hypothesize here that inactivation of AHR could prevent the CSC-induced cell death in spermatocytes. We demonstrate that CSC exposure generates oxidative stress, which differentially regulates mitochondrial apoptosis in GC-2spd(ts) and wild type (WT) and AHR knockout (AHR-KO) mouse embryonic fibroblasts (MEFs). SiRNA-mediated silencing of Ahr augments the extent of CSC-mediated cellular damage while complementing the AHR-knockout condition. Pharmacological inhibition using the AHR-antagonist (CH223191) modulates the CSC-altered expression of apoptotic proteins and significantly abrogates DNA fragmentation though the cleavage of PARP appears AHR independent. Pretreatment with CH223191 at concentrations above 50 μM significantly prevents the CSC-induced activation of caspase-3/7 and externalization of phosphatidylserine in the plasma membrane. However, MAPK inhibitors alone or together with CH223191 could not prevent the membrane damage upon CSC addition and the caspase-3/7 activation and membrane damage in AHR-deficient MEF indicates the interplay of multiple cell signaling and cytoprotective ability of AHR. Thus the data obtained on one hand signifies the protective role of AHR in maintaining normal cellular homeostasis and the other, could be a potential prophylactic therapeutic target to promote cell survival and growth under cigarette smoke exposed environment by receptor antagonism via CH223191-like mechanism. Antagonist-mediated inactivation of the aryl hydrocarbon receptor blocks downstream events leading to cigarette smoke-induced cell death of a spermatocyte cell line.
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Affiliation(s)
- P Esakky
- Department of Veterans Affairs Medical Center, Washington University School of Medicine, St. Louis, MO, USA
- Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO, USA
| | - D A Hansen
- Department of Veterans Affairs Medical Center, Washington University School of Medicine, St. Louis, MO, USA
| | - A M Drury
- Department of Veterans Affairs Medical Center, Washington University School of Medicine, St. Louis, MO, USA
- Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO, USA
| | - A Cusumano
- Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO, USA
| | - K H Moley
- Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, MO, USA
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47
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Esser C, Rannug A. The aryl hydrocarbon receptor in barrier organ physiology, immunology, and toxicology. Pharmacol Rev 2015; 67:259-79. [PMID: 25657351 DOI: 10.1124/pr.114.009001] [Citation(s) in RCA: 351] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The aryl hydrocarbon receptor (AhR) is an evolutionarily old transcription factor belonging to the Per-ARNT-Sim-basic helix-loop-helix protein family. AhR translocates into the nucleus upon binding of various small molecules into the pocket of its single-ligand binding domain. AhR binding to both xenobiotic and endogenous ligands results in highly cell-specific transcriptome changes and in changes in cellular functions. We discuss here the role of AhR for immune cells of the barrier organs: skin, gut, and lung. Both adaptive and innate immune cells require AhR signaling at critical checkpoints. We also discuss the current two prevailing views-namely, 1) AhR as a promiscuous sensor for small chemicals and 2) a role for AhR as a balancing factor for cell differentiation and function, which is controlled by levels of endogenous high-affinity ligands. AhR signaling is considered a promising drug and preventive target, particularly for cancer, inflammatory, and autoimmune diseases. Therefore, understanding its biology is of great importance.
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Affiliation(s)
- Charlotte Esser
- Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany (C.E.); and Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden (A.R.)
| | - Agneta Rannug
- Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany (C.E.); and Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden (A.R.)
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Patel A, Zhang S, Paramahamsa M, Jiang W, Wang L, Moorthy B, Shivanna B. Leflunomide Induces Pulmonary and Hepatic CYP1A Enzymes via Aryl Hydrocarbon Receptor. Drug Metab Dispos 2015; 43:1966-70. [PMID: 26417045 DOI: 10.1124/dmd.115.066084] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 09/25/2015] [Indexed: 11/22/2022] Open
Abstract
Emerging evidence indicates that the aryl hydrocarbon receptor (AhR) plays a crucial role in normal physiologic homeostasis. Additionally, aberrant AhR signaling leads to several pathologic states in the lung and liver. Activation of AhR transcriptionally induces phase I (CYP1A) detoxifying enzymes. Although the effects of the classic AhR ligands such as 3-methylcholanthrene and dioxins on phase 1 enzymes are well studied in rodent lung, liver, and other organs, the toxicity profiles limit their use as therapeutic agents in humans. Hence, there is a need to identify and investigate nontoxic AhR ligands not only to understand the AhR biology but also to develop the AhR as a clinically relevant therapeutic target. Leflunomide is a Food and Drug Administration-approved drug in humans that is known to have AhR agonist activity in vitro. Whether it activates AhR and induces phase 1 enzymes in vivo is unknown. Therefore, we tested the hypothesis that leflunomide will induce pulmonary and hepatic CYP1A enzymes in C57BL/6J wild-type mice, but not in AhR-null mice. We performed real-time reverse-transcription polymerase chain reaction analyses for CYP1A1/2 mRNA expression, western blot assays for CYP1A1/2 protein expression, and ethoxyresorufinO-deethylase assay for CYP1A1 catalytic activity. Leflunomide increased CYP1A1/A2 mRNA, protein, and enzymatic activities in wild-type mice. In contrast, leflunomide failed to increase pulmonary and hepatic CYP1A enzymes in AhR-null mice. In conclusion, we provide evidence that leflunomide induces pulmonary and hepatic CYP1A enzymes via the AhR.
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Affiliation(s)
- Ananddeep Patel
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas
| | - Shaojie Zhang
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas
| | - Maturu Paramahamsa
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas
| | - Weiwu Jiang
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas
| | - Lihua Wang
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas
| | - Bhagavatula Moorthy
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas
| | - Binoy Shivanna
- Section of Neonatology, Department of Pediatrics, Texas Children's Hospital, Baylor College of Medicine, Houston, Texas
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Ghatrehsamani M, Soleimani M, Esfahani BAM, Shirzad H, Hakemi MG, Mossahebimohammadi M, Eskandari N, Adib M. Tumor necrosis factor-α inhibits effects of aryl hydrocarbon receptor ligands on cell death in human lymphocytes. Adv Biomed Res 2015; 4:216. [PMID: 26605245 PMCID: PMC4627181 DOI: 10.4103/2277-9175.166163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 01/10/2015] [Indexed: 11/11/2022] Open
Abstract
Background: Activation of aryl hydrocarbon receptor (AhR) leads to diverse outcome in various kinds of cells. AhR activation may induce apoptosis or prevent of apoptosis and cell death. Recent studies suggest that apoptosis effects of AhR can be modulated by inflammatory cytokine like tumor necrosis factor alpha (TNF-α). In this study, we try to investigate the possible interaction of TNF-α with the 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (TCDD), a ligand of AhR, on peripheral lymphocytes. Materials and Methods: Human peripheral blood mononuclear cells (PBMCs) were isolated from peripheral blood by discontinuous density gradient centrifugation on ficoll. Isolated PBMCs were divided into four groups: Control group, TNF-α administered group, TCDD administered group, co-administered group with TCDD and TNF-α. Cells were maintained for a week in lymphocyte culture condition. Then, TNF-α was added to group 2 and 4. Finally, apoptosis and necrosis were analyzed in all samples using flowcytometry. Result: In group 4, the mean percent of necrosis and apoptosis in TCDD treatment groups was significantly larger than other groups; (P < 0.05). Furthermore, there was no significant difference between the mean percent of cell death in TNF-α administered group and TCDD administered group (P > 0.05). However, the mean percent of cell death in co-administered group with TCDD and TNF-α was significantly lower than other groups; (P < 0.05). Conclusion: TNF-α could significantly inhibit effects of TCDD on lymphocytes apoptosis. Combination effects of TNF-α and TCDD on lymphocyte increase cell survival.
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Affiliation(s)
- Mahdi Ghatrehsamani
- Department of Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran ; Department of Stem Cell Biology, Stem Cell Technology Research Center, Tehran, Iran
| | - Masoud Soleimani
- Department of Hematology, Tarbiat Modares University, Tehran, Iran
| | | | - Hedayatollah Shirzad
- Cellular and Molecular Research Center, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Mazdak G Hakemi
- Department of Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Majid Mossahebimohammadi
- Department of Stem Cell Biology, Stem Cell Technology Research Center, Tehran, Iran ; Department of Hematology, Tarbiat Modares University, Tehran, Iran
| | - Nahid Eskandari
- Department of Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Minoo Adib
- Department of Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
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Sheridan JA, Zago M, Nair P, Li PZ, Bourbeau J, Tan WC, Hamid Q, Eidelman DH, Benedetti AL, Baglole CJ. Decreased expression of the NF-κB family member RelB in lung fibroblasts from Smokers with and without COPD potentiates cigarette smoke-induced COX-2 expression. Respir Res 2015; 16:54. [PMID: 25943190 PMCID: PMC4427974 DOI: 10.1186/s12931-015-0214-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 04/21/2015] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Heightened inflammation, including expression of COX-2, is associated with COPD pathogenesis. RelB is an NF-κB family member that attenuates COX-2 in response to cigarette smoke by a mechanism that may involve the miRNA miR-146a. There is no information on the expression of RelB in COPD or if RelB prevents COX-2 expression through miR-146a. METHODS RelB, Cox-2 and miR-146a levels were evaluated in lung fibroblasts and blood samples derived from non-smokers (Normal) and smokers (At Risk) with and without COPD by qRT-PCR. RelB and COX-2 protein levels were evaluated by western blot. Human lung fibroblasts from Normal subjects and smokers with and without COPD, along with RelB knock-down (siRNA) in Normal cells, were exposed to cigarette smoke extract (CSE) in vitro and COX-2 mRNA/protein and miR-146a levels assessed. RESULTS Basal expression of RelB mRNA and protein were significantly lower in lung cells derived from smokers with and without COPD, the latter of which expressed more Cox-2 mRNA and protein in response to CSE. Knock-down of RelB in Normal fibroblasts increased Cox-2 mRNA and protein induction by CSE. Basal miR-146a levels were not different between the three groups, and only Normal fibroblasts increased miR-146a expression in response to smoke. There was a positive correlation between systemic RelB and Cox-2 mRNA levels and circulating miR-146a levels were higher only in GOLD stage I subjects. CONCLUSIONS Our data indicate that RelB attenuates COX-2 expression in lung structural cells, such that loss of pulmonary RelB may be an important determinant in the aberrant, heightened inflammation associated with COPD pathogenesis.
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Affiliation(s)
- Jared A Sheridan
- Department of Medicine, 1001 Decarie Blvd, Montreal, QC, H4A 3J1, Canada.
| | - Michela Zago
- Department of Medicine, 1001 Decarie Blvd, Montreal, QC, H4A 3J1, Canada.
| | | | - Pei Z Li
- Respiratory Epidemiology and Clinical Research Unit, Montreal Chest Institute, McGill University, Montreal, QC, Canada.
| | - Jean Bourbeau
- Respiratory Epidemiology and Clinical Research Unit, Montreal Chest Institute, McGill University, Montreal, QC, Canada.
| | - Wan C Tan
- The UBC James Hogg Research Centre, University of British Columbia, Vancouver, BC, Canada.
| | - Qutayba Hamid
- Department of Medicine, 1001 Decarie Blvd, Montreal, QC, H4A 3J1, Canada.
- Research Institute of the McGill University Health Centre, 1001 Decarie Blvd, Montreal, QC, H4A 3J1, Canada.
| | - David H Eidelman
- Department of Medicine, 1001 Decarie Blvd, Montreal, QC, H4A 3J1, Canada.
- Research Institute of the McGill University Health Centre, 1001 Decarie Blvd, Montreal, QC, H4A 3J1, Canada.
| | - Andrea L Benedetti
- Department of Epidemiology and Biostatistics, 1001 Decarie Blvd, Montreal, QC, H4A 3J1, Canada.
| | - Carolyn J Baglole
- Department of Medicine, 1001 Decarie Blvd, Montreal, QC, H4A 3J1, Canada.
- Research Institute of the McGill University Health Centre, 1001 Decarie Blvd, Montreal, QC, H4A 3J1, Canada.
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