1
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Gan M, Ding H, Chen G. 6-Formylindolo[3,2-b]carbazole reduces apoptosis induced by benzo[a]pyrene in a mitochondrial-dependent manner. Cell Biol Int 2020; 44:2427-2437. [PMID: 32808713 DOI: 10.1002/cbin.11450] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 07/24/2020] [Accepted: 08/16/2020] [Indexed: 01/02/2023]
Abstract
Benzo[a]pyrene (B[a]P), a potent carcinogen, has been proved that it can induce apoptosis via activation of the aryl hydrocarbon receptor (AhR) pathway. The metabolite of tryptophan 6-formylindolo[3,2-b]carbazole (FICZ), an endogenous activator of AhR, plays bifunctional roles in cell growth and apoptosis. However, whether and how FICZ can reduce the toxicity of B[a]P and the mechanism underlying this remain unclear. In this study, FICZ interfered with the toxicity of B[a]P in mouse hepatocarcinoma cell line Hepa1-6. The results of the MTT assay indicated that FICZ and B[a]P made opposite effects on cell proliferation. The scratch-wound healing assay showed that B[a]P (1 µM for 24 hr) exposure triggered cell migration and that was inhibited by FICZ (10 nM). In addition, FICZ ameliorated B[a]P-induced apoptosis by inhibiting reactive oxygen species generation and caspase-3 activation, as well as increasing reduced glutathione level in mitochondria. Furthermore, gene expression analyses indicated that FICZ competed with B[a]P, which reduced the transcriptional activation of the cyp1a1 and cyp1b1 genes, as well as Bcl2 and P53. Accordingly, the interaction between FICZ and B[a]P in the AhR pathway inhibited apoptosis in a mitochondrial-dependent manner, suggesting that endogenous compound may reduce the toxicity of exogenous pollutant in vivo and providing an available way to improve health condition related to the hepatic metabolic disorder.
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Affiliation(s)
- Min Gan
- Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China.,Key Laboratory of Feed Biotechnology, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Hongbiao Ding
- Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China.,Key Laboratory of Feed Biotechnology, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Gang Chen
- Key Laboratory of Agro-Product Quality and Safety, Institute of Quality Standards and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, China
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2
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Olivares-Rubio HF, Salazar-Coria L, Romero-López JP, Domínguez-López ML, García-Latorre EA, Vega-López A. Fatty acid metabolism and brain mitochondrial performance of juvenile Nile tilapia (Oreochromis niloticus) exposed to the water-accommodated fraction of Maya crude oil. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 197:110624. [PMID: 32302862 DOI: 10.1016/j.ecoenv.2020.110624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 03/18/2020] [Accepted: 04/09/2020] [Indexed: 06/11/2023]
Abstract
Crude oil and its derivatives are still the primary source of energy for humankind. However, during its transportation and treatment, spills of this resource can occur in aquatic environments. Nile tilapia is one of the most globally widespread fish species. This species is even found in brackish water due to its tolerance to salinity and pollution. In this study, the performance of brain cells (mitochondrial membrane potential [ΔΨm], calcium [Ca2+] and O2 and H2O2 levels) exposed to crude oil was assessed. In addition, fatty acid metabolism (cholesterol concentration and fatty acid synthase [FAS], acyl CoA-oxidase [AOX] and catalase [CAT] activities) in the brain, heart, liver and intestine of Nile tilapia exposed to the water-accommodated fraction (WAF) of 0.01, 0.1 or 1 g/L Maya crude oil (MCO) for 96 h were evaluated. After exposure, in brain cells, there were only increases in ROS and slight reductions in ΔΨm. Exposure to WAF of MCO induced and increased the levels of cholesterol and altered FAS and AOX activities in all examined tissues. The brain is the most susceptible organ to alterations in the activity of fatty acid metabolic enzymes and cholesterol levels relative to the heart, liver and intestine. The correlation between inhibition of the activity of CAT and AOX suggests a possible reduction in the proliferation and size of peroxisomes. Most biomarkers were significantly altered in the brains of Nile tilapia exposed to the WAF containing 1 g/L MCO in comparison to the control.
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Affiliation(s)
- Hugo F Olivares-Rubio
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Laboratorio de Toxicología Ambiental, Av. Wilfrido Massieu s/n, Unidad Profesional Zacatenco, CP 07738, Ciudad de México, México, Mexico; Instituto de Investigaciones Biomédicas, Departamento de Medicina Genómica y Toxicología Ambiental, Universidad Nacional Autónoma de México, Ap. Postal 70-228, Ciudad de México, Mexico
| | - Lucía Salazar-Coria
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Laboratorio de Toxicología Ambiental, Av. Wilfrido Massieu s/n, Unidad Profesional Zacatenco, CP 07738, Ciudad de México, México, Mexico; Dirección de Investigación en Transformación de Hidrocarburos, Instituto Mexicano Del Petróleo, Eje Central Lázaro Cárdenas Norte 152, San Bartolo Atepehuacan, CP 07730, Ciudad de México, Mexico
| | - J Pablo Romero-López
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Laboratorio de Inmunoquímica I, Prol Carpio y Plan de Ayala s/n, Col. Casco de Santo Tomás, CP 11340, Ciudad de México, México, Mexico
| | - María Lilia Domínguez-López
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Laboratorio de Inmunoquímica I, Prol Carpio y Plan de Ayala s/n, Col. Casco de Santo Tomás, CP 11340, Ciudad de México, México, Mexico
| | - Ethel A García-Latorre
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Laboratorio de Inmunoquímica I, Prol Carpio y Plan de Ayala s/n, Col. Casco de Santo Tomás, CP 11340, Ciudad de México, México, Mexico
| | - Armando Vega-López
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Laboratorio de Toxicología Ambiental, Av. Wilfrido Massieu s/n, Unidad Profesional Zacatenco, CP 07738, Ciudad de México, México, Mexico.
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3
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Hardonnière K, Lagadic-Gossmann D. ATPase inhibitory factor 1 (IF1): a novel player in pollutant-related diseases? CURRENT OPINION IN TOXICOLOGY 2018. [DOI: 10.1016/j.cotox.2017.12.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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4
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Hardonnière K, Fernier M, Gallais I, Mograbi B, Podechard N, Le Ferrec E, Grova N, Appenzeller B, Burel A, Chevanne M, Sergent O, Huc L, Bortoli S, Lagadic-Gossmann D. Role for the ATPase inhibitory factor 1 in the environmental carcinogen-induced Warburg phenotype. Sci Rep 2017; 7:195. [PMID: 28298645 PMCID: PMC5428028 DOI: 10.1038/s41598-017-00269-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 02/14/2017] [Indexed: 11/28/2022] Open
Abstract
Most tumors undergo metabolic reprogramming towards glycolysis, the so-called Warburg effect, to support growth and survival. Overexpression of IF1, the physiological inhibitor of the F0F1ATPase, has been related to this phenomenon and appears to be a relevant marker in cancer. Environmental contributions to cancer development are now widely accepted but little is known about the underlying intracellular mechanisms. Among the environmental pollutants humans are commonly exposed to, benzo[a]pyrene (B[a]P), the prototype molecule of polycyclic aromatic hydrocarbons (PAHs), is a well-known human carcinogen. Besides apoptotic signals, B[a]P can also induce survival signals in liver cells, both likely involved in cancer promotion. Our previous works showed that B[a]P elicited a Warburg-like effect, thus favoring cell survival. The present study aimed at further elucidating the molecular mechanisms involved in the B[a]P-induced metabolic reprogramming, by testing the possible involvement of IF1. We presently demonstrate, both in vitro and in vivo, that PAHs, especially B[a]P, strongly increase IF1 expression. Such an increase, which might rely on β2-adrenergic receptor activation, notably participates to the B[a]P-induced glycolytic shift and cell survival in liver cells. By identifying IF1 as a target of PAHs, this study provides new insights about how environmental factors may contribute to related carcinogenesis.
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Affiliation(s)
- Kévin Hardonnière
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France
- Université de Rennes 1, Biosit UMS3080, 35043, Rennes Cédex, France
| | - Morgane Fernier
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France
- Université de Rennes 1, Biosit UMS3080, 35043, Rennes Cédex, France
| | - Isabelle Gallais
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France
- Université de Rennes 1, Biosit UMS3080, 35043, Rennes Cédex, France
| | - Baharia Mograbi
- Institute of Research on Cancer and Ageing of Nice (IRCAN), INSERM U1081, CNRS UMR7284, Université de Nice-Sophia Antipolis, Faculté de Médecine, Centre Antoine Lacassagne, Nice, F-06107, France
| | - Normand Podechard
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France
- Université de Rennes 1, Biosit UMS3080, 35043, Rennes Cédex, France
| | - Eric Le Ferrec
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France
- Université de Rennes 1, Biosit UMS3080, 35043, Rennes Cédex, France
| | - Nathalie Grova
- HBRU, Luxembourg Institute of Health, 29, rue Henri Koch, L-4354, Esch-sur-Alzette, Luxembourg
| | - Brice Appenzeller
- HBRU, Luxembourg Institute of Health, 29, rue Henri Koch, L-4354, Esch-sur-Alzette, Luxembourg
| | - Agnès Burel
- Université de Rennes 1, Biosit UMS3080, 35043, Rennes Cédex, France
| | - Martine Chevanne
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France
- Université de Rennes 1, Biosit UMS3080, 35043, Rennes Cédex, France
| | - Odile Sergent
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France
- Université de Rennes 1, Biosit UMS3080, 35043, Rennes Cédex, France
| | | | - Sylvie Bortoli
- INSERM UMR-S 1124, Université Paris Descartes, Centre Universitaire des Saint-Pères, Paris, France
| | - Dominique Lagadic-Gossmann
- Inserm U1085, Institut de Recherche en Santé, Environnement, Travail, Rennes, France.
- Université de Rennes 1, Biosit UMS3080, 35043, Rennes Cédex, France.
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5
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Das DN, Panda PK, Naik PP, Mukhopadhyay S, Sinha N, Bhutia SK. Phytotherapeutic approach: a new hope for polycyclic aromatic hydrocarbons induced cellular disorders, autophagic and apoptotic cell death. Toxicol Mech Methods 2017; 27:1-17. [PMID: 27919191 DOI: 10.1080/15376516.2016.1268228] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) comprise the major class of cancer-causing chemicals and are ranked ninth among the chemical compounds threatening to humans. Moreover, interest in PAHs has been mainly due to their genotoxic, teratogenic, mutagenic and carcinogenic property. Polymorphism in cytochrome P450 (CYP450) and aryl hydrocarbon receptor (AhR) has the capacity to convert procarcinogens into carcinogens, which is an imperative factor contributing to individual susceptibility to cancer development. The carcinogenicity potential of PAHs is related to their ability to bind to DNA, thereby enhances DNA cross-linking, causing a series of disruptive effects which can result in tumor initiation. They induce cellular toxicity by regulating the generation of reactive oxygen species (ROS), which arbitrate apoptosis. Additionally, cellular toxicity-mediated apoptotic and autophagic cell death and immune suppression by industrial pollutants PAH, provide fertile ground for the proliferation of mutated cells, which results in cancer growth and progression. PAHs play a foremost role in angiogenesis necessary for tumor metastasization by promoting the upregulation of metalloproteinase-9 (MMP-9), vascular endothelial growth factor (VEGF) and hypoxia inducible factor (HIF) in human cancer cells. This review sheds light on the molecular mechanisms of PAHs induced cancer development as well as autophagic and apoptotic cell death. Besides that authors have unraveled how phytotherapeutics is an alternate potential therapeutics acting as a savior from the toxic effects of PAHs for safer and cost effective perspectives.
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Affiliation(s)
- Durgesh Nandini Das
- a Department of Life Sciences , National Institute of Technology , Rourkela , India
| | | | - Prajna Paramita Naik
- a Department of Life Sciences , National Institute of Technology , Rourkela , India
| | | | - Niharika Sinha
- a Department of Life Sciences , National Institute of Technology , Rourkela , India
| | - Sujit K Bhutia
- a Department of Life Sciences , National Institute of Technology , Rourkela , India
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6
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Hardonnière K, Huc L, Sergent O, Holme JA, Lagadic-Gossmann D. Environmental carcinogenesis and pH homeostasis: Not only a matter of dysregulated metabolism. Semin Cancer Biol 2017; 43:49-65. [PMID: 28088583 DOI: 10.1016/j.semcancer.2017.01.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 01/05/2017] [Accepted: 01/05/2017] [Indexed: 12/18/2022]
Abstract
According to the World Health Organization, around 20% of all cancers would be due to environmental factors. Among these factors, several chemicals are indeed well recognized carcinogens. The widespread contaminant benzo[a]pyrene (B[a]P), an often used model carcinogen of the polycyclic aromatic hydrocarbons' family, has been suggested to target most, if not all, cancer hallmarks described by Hanahan and Weinberg. It is classified as a group I carcinogen by the International Agency for Research on Cancer; however, the precise intracellular mechanisms underlying its carcinogenic properties remain yet to be thoroughly defined. Recently, the pH homeostasis, a well known regulator of carcinogenic processes, was suggested to be a key actor in both cell death and Warburg-like metabolic reprogramming induced upon B[a]P exposure. The present review will highlight those data with the aim of favoring research on the role of H+ dynamics in environmental carcinogenesis.
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Affiliation(s)
- Kévin Hardonnière
- Institut national de la santé et de la recherche médicale (Inserm), Institut de recherche en santé, environnement et travail (Irset - Inserm UMR 1085), F-35043 Rennes, France; Université de Rennes 1, Structure fédérative de recherche Biosit, UMS CNRS 3480/US Inserm 018, F 35043 Rennes, France
| | - Laurence Huc
- INRA UMR 1331 ToxAlim (Research Center in Food Toxicology), University of Toulouse ENVT, INP, UPS, 180 Chemin de Tournefeuille, F-31027, France
| | - Odile Sergent
- Institut national de la santé et de la recherche médicale (Inserm), Institut de recherche en santé, environnement et travail (Irset - Inserm UMR 1085), F-35043 Rennes, France; Université de Rennes 1, Structure fédérative de recherche Biosit, UMS CNRS 3480/US Inserm 018, F 35043 Rennes, France
| | - Jørn A Holme
- Domain of Infection Control, Environment and Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Dominique Lagadic-Gossmann
- Institut national de la santé et de la recherche médicale (Inserm), Institut de recherche en santé, environnement et travail (Irset - Inserm UMR 1085), F-35043 Rennes, France; Université de Rennes 1, Structure fédérative de recherche Biosit, UMS CNRS 3480/US Inserm 018, F 35043 Rennes, France.
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7
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The environmental carcinogen benzo[a]pyrene induces a Warburg-like metabolic reprogramming dependent on NHE1 and associated with cell survival. Sci Rep 2016; 6:30776. [PMID: 27488617 PMCID: PMC4973274 DOI: 10.1038/srep30776] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 07/10/2016] [Indexed: 12/30/2022] Open
Abstract
Cancer cells display alterations in many cellular processes. One core hallmark of cancer is the Warburg effect which is a glycolytic reprogramming that allows cells to survive and proliferate. Although the contributions of environmental contaminants to cancer development are widely accepted, the underlying mechanisms have to be clarified. Benzo[a]pyrene (B[a]P), the prototype of polycyclic aromatic hydrocarbons, exhibits genotoxic and carcinogenic effects, and it is a human carcinogen according to the International Agency for Research on Cancer. In addition to triggering apoptotic signals, B[a]P may induce survival signals, both of which are likely to be involved in cancer promotion. We previously suggested that B[a]P-induced mitochondrial dysfunctions, especially membrane hyperpolarization, might trigger cell survival signaling in rat hepatic epithelial F258 cells. Here, we further characterized these dysfunctions by focusing on energy metabolism. We found that B[a]P promoted a metabolic reprogramming. Cell respiration decreased and lactate production increased. These changes were associated with alterations in the tricarboxylic acid cycle which likely involve a dysfunction of the mitochondrial complex II. The glycolytic shift relied on activation of the Na+/H+ exchanger 1 (NHE1) and appeared to be a key feature in B[a]P-induced cell survival related to changes in cell phenotype (epithelial-to-mesenchymal transition and cell migration).
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8
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Qin G, Wu M, Sang N. Sulfur dioxide and benzo(a)pyrene trigger apoptotic and anti-apoptotic signals at different post-exposure times in mouse liver. CHEMOSPHERE 2015; 139:318-325. [PMID: 26162325 DOI: 10.1016/j.chemosphere.2015.06.052] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Revised: 06/18/2015] [Accepted: 06/21/2015] [Indexed: 06/04/2023]
Abstract
There is considerable concern that exposure to PAHs in combination with other air pollutants may lead to cancer or apoptosis in different cells. This study investigated the interaction effects between SO2 and BaP in mouse liver after long-term exposure. Mice were exposed to BaP for 5days or SO2 inhalation for 4weeks alone or together. The mitochondrial membrane potential (MMP) was assessed using the lipophilic cationic probe JC-1. The mRNA and protein level of several mitochondrial respiratory complex subunits and apoptosis-related genes were analyzed by real-time RT-PCR and/or western blot, respectively. We observed the pathology change of the mouse liver after 4-week treatments. It was revealed that MMP was reduced after co-exposure of SO2 and BaP after a 4-week treatment (1day post-exposure, p.e. 1d), with the suppression of the mRNA expression of complexes IV and V subunits, CO1, CO4, and ATP6. Co-exposure of SO2 and BaP appeared to be able to cause apoptotic signals, as judged by the suppression of bcl-2 and the bcl-2/bax ratio and the elevation of bax, caspase 3 activation, p53 accumulation and phosphorylation 1d post-exposure to SO2 and BaP, while the anti-apoptotic signal was detected by the elevation of bcl-2 and the bcl-2/bax ratio as well as the suppression of bax and p53 expression after a 13-week post-exposure (p.e. 13w) of SO2 and BaP. These results indicate that co-exposure to SO2 and BaP appears to lead to apoptotic as well as anti-apoptotic signals at different post-exposure times.
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Affiliation(s)
- Guohua Qin
- College of Environment and Resource, Shanxi University, Taiyuan, Shanxi 030006, China
| | - Meiqiong Wu
- College of Environment and Resource, Shanxi University, Taiyuan, Shanxi 030006, China
| | - Nan Sang
- College of Environment and Resource, Shanxi University, Taiyuan, Shanxi 030006, China.
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9
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Benzo[a]pyrene-induced nitric oxide production acts as a survival signal targeting mitochondrial membrane potential. Toxicol In Vitro 2015; 29:1597-608. [DOI: 10.1016/j.tiv.2015.06.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Revised: 06/12/2015] [Accepted: 06/13/2015] [Indexed: 01/08/2023]
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10
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Zhang L, Bao Y, Li J. Nuclear respiratory factor-1 is involved in mitochondrial dysfunction induced by benzo(a)pyrene in human bronchial epithelial cells. Basic Clin Pharmacol Toxicol 2011; 109:115-22. [PMID: 21401886 DOI: 10.1111/j.1742-7843.2011.00697.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In this study, we investigated the role of nuclear respiratory factor-1(NRF-1) in benzo(a)pyrene (BaP)-induced mitochondrial events in human bronchial epithelial cells (16HBE). Cytotoxicity was determined with MTT assay, and apoptosis was measured by flow cytometry. The results showed that BaP inhibited cell proliferation in a dose-dependent manner and induced apoptosis in 16HBE cells. Time-dependent reactive oxygen species (ROS) generation induced by BaP was observed in 16HBE cells. The loss of mitochondrial membrane permeability transition (MPT) was obtained by a laser scanning confocal microscope, and the decreasing ATP level was detected by a Cell-Titer-Glo(®) Luminescent Cell Viability Assay. Results of western blotting assay revealed that both NRF-1 and mitochondrial transcription factor A (mtTFA) decreased in 12-μM BaP-treated cells at both 12 and 24 hr. The results of RT-PCR indicate that NRF-1 and mtTFA mRNA in 16HBE cells were not changed after BaP treatment 12 or 24 hr. Down-regulation of NRF-1 by shRNA further reduced the loss of MPT and increased ROS generation in response to BaP treatment. Therefore, our results demonstrate that NRF-1 is responsible for BaP-induced mitochondrial dysfunction in 16HBE cells and associated with the level of mtTFA protein, loss of MPT and ROS overproduction.
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Affiliation(s)
- Lijuan Zhang
- Department of Prevention, Tongji University School of Medicine, Shanghai, China
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11
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Yang G, Jiang Y, Rao K, Chen X, Wang Q, Liu A, Xiong W, Yuan J. Mitochondrial dysfunction and transactivation of p53-dependent apoptotic genes in BaP-treated human fetal lung fibroblasts. Hum Exp Toxicol 2011; 30:1904-13. [DOI: 10.1177/0960327111401637] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Benzo(a)pyrene (BaP) has been shown to be an inducer of apoptosis. However, mechanisms involved in BaP-induced mitochondrial dysfunction are not well-known. In this study, human fetal lung fibroblasts cells were treated with BaP (8, 16, 32, 64 and 128 μM) for 4 and 12 h. Cell viability, intracellular level of reactive oxygen species (ROS), total antioxidant capacity (T-AOC), mitochondrial membrane potential (Δ Ψm) and cytochrome c release were determined. Changes in transcriptional levels of p53-dependent apoptotic genes ( p53, APAF1, CASPASE3, CASPASE9, NOXA and PUMA) were measured. At time point of 4 h, BaP induced the intracellular ROS generation in 64 ( p < .05) and 128 μM BaP groups ( p < .01) but decreased the T-AOC activities in 32, 64 ( p < .05 for both) and 128 μM BaP groups ( p < .01). At time point of 12 h, Δ Ψm significantly decreased in ≥32 μM BaP groups ( p < .05 for all). Amount of mitochondrial cytochrome c significantly increased in 128 μM BaP group ( p < .01). Transcriptional levels of CASPASE3, CASPASE9, APAF1 and PUMA were up-regulated in all BaP groups ( p < .05 for all) and in ≥32 μM groups for NOXA ( p < .05). But only in 16 μM BaP group a relatively little expression of p53 mRNA was observed ( p < .05). The results indicate that in the earlier period BaP promoted the generation of excessive ROS and subsequently the mitochondrial depolarization, whereas transactivations of the p53-dependent apoptotic genes were significantly induced at the later period.
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Affiliation(s)
- Guangtao Yang
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- The MOE Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ying Jiang
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- The MOE Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Kaimin Rao
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- The MOE Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xi Chen
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- The MOE Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qian Wang
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- The MOE Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ailin Liu
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- The MOE Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wei Xiong
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- The MOE Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jing Yuan
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- The MOE Key Laboratory of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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12
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Tekpli X, Rissel M, Huc L, Catheline D, Sergent O, Rioux V, Legrand P, Holme JA, Dimanche-Boitrel MT, Lagadic-Gossmann D. Membrane remodeling, an early event in benzo[a]pyrene-induced apoptosis. Toxicol Appl Pharmacol 2009; 243:68-76. [PMID: 19931295 DOI: 10.1016/j.taap.2009.11.014] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2009] [Revised: 11/01/2009] [Accepted: 11/10/2009] [Indexed: 11/24/2022]
Abstract
Benzo[alpha]pyrene (B[alpha]P) often serves as a model for mutagenic and carcinogenic polycyclic aromatic hydrocarbons (PAHs). Our previous work suggested a role of membrane fluidity in B[alpha]P-induced apoptotic process. In this study, we report that B[alpha]P modifies the composition of cholesterol-rich microdomains (lipid rafts) in rat liver F258 epithelial cells. The cellular distribution of the ganglioside-GM1 was markedly changed following B[alpha]P exposure. B[alpha]P also modified fatty acid composition and decreased the cholesterol content of cholesterol-rich microdomains. B[alpha]P-induced depletion of cholesterol in lipid rafts was linked to a reduced expression of 3-hydroxy-3-methylglutaryl-CoA reductase (HMG-CoA reductase). Aryl hydrocarbon receptor (AhR) and B[alpha]P-related H(2)O(2) formation were involved in the reduced expression of HMG-CoA reductase and in the remodeling of membrane microdomains. The B[alpha]P-induced membrane remodeling resulted in an intracellular alkalinization observed during the early phase of apoptosis. In conclusion, B[alpha]P altered the composition of plasma membrane microstructures through AhR and H(2)O(2) dependent-regulation of lipid biosynthesis. In F258 cells, the B[alpha]P-induced membrane remodeling was identified as an early apoptotic event leading to an intracellular alkalinization.
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Affiliation(s)
- Xavier Tekpli
- EA 4427 SeRAIC, Equipe labellisée Ligue contre le Cancer, Université de Rennes 1, IFR 140, 35043 Rennes cédex, France
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13
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Huc L, Tekpli X, Holme JA, Rissel M, Solhaug A, Gardyn C, Le Moigne G, Gorria M, Dimanche-Boitrel MT, Lagadic-Gossmann D. c-Jun NH2-terminal kinase-related Na+/H+ exchanger isoform 1 activation controls hexokinase II expression in benzo(a)pyrene-induced apoptosis. Cancer Res 2007; 67:1696-705. [PMID: 17308111 DOI: 10.1158/0008-5472.can-06-2327] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Regulation of the balance between survival, proliferation, and apoptosis on carcinogenic polycyclic aromatic hydrocarbon (PAH) exposure is still poorly understood and more particularly the role of physiologic variables, including intracellular pH (pH(i)). Although the involvement of the ubiquitous pH(i) regulator Na(+)/H(+) exchanger isoform 1 (NHE1) in tumorigenesis is well documented, less is known about its role and regulation during apoptosis. Our previous works have shown the primordial role of NHE1 in carcinogenic PAH-induced apoptosis. This alkalinizing transporter was activated by an early CYP1-dependent H(2)O(2) production, subsequently promoting mitochondrial dysfunction leading to apoptosis. The aim of this study was to further elucidate how NHE1 was activated by benzo(a)pyrene (BaP) and what the downstream events were in the context of apoptosis. Our results indicate that the mitogen-activated protein kinase kinase 4/c-Jun NH(2)-terminal kinase (MKK4/JNK) pathway was a link between BaP-induced H(2)O(2) production and NHE1 activation. This activation, in combination with BaP-induced phosphorylated p53, promoted mitochondrial superoxide anion production, supporting the existence of a common target for NHE1 and p53. Furthermore, we showed that the mitochondrial expression of glycolytic enzyme hexokinase II (HKII) was decreased following a combined action of NHE1 and p53 pathways, thereby enhancing the BaP-induced apoptosis. Taken together, our findings suggest that, on BaP exposure, MKK4/JNK targets NHE1 with consequences on HKII protein, which might thus be a key protein during carcinogenic PAH apoptosis.
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Affiliation(s)
- Laurence Huc
- Institut National de la Santé et de la Recherche Médicale U620, Université Rennes 1, IFR 140, 2 Avenue du Pr. Léon Bernard, Rennes, France
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14
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Holme JA, Gorria M, Arlt VM, Ovrebø S, Solhaug A, Tekpli X, Landvik NE, Huc L, Fardel O, Lagadic-Gossmann D. Different mechanisms involved in apoptosis following exposure to benzo[a]pyrene in F258 and Hepa1c1c7 cells. Chem Biol Interact 2007; 167:41-55. [PMID: 17289009 DOI: 10.1016/j.cbi.2007.01.008] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2006] [Revised: 12/21/2006] [Accepted: 01/08/2007] [Indexed: 01/12/2023]
Abstract
The present study compares and elucidates possible mechanisms why B[a]P induces different cell signals and triggers apparently different apoptotic pathways in two rather similar cell lines (hepatic epithelial cells of rodents). The rate and maximal capacity of metabolic activation, as measured by the formation of B[a]P-tetrols and B[a]P-DNA adducts, was much higher in mouse hepatoma Hepa1c1c7 cells than in rat liver epithelial F258 cells due to a higher induced level of cyp1a1. B[a]P increased intracellular pH in both cell lines, but this change modulated the apoptotic process only in F258 cells. In Hepa1c1c7 cells reactive oxygen species (ROS) production appeared to be a consequence of toxicity, unlike F258 cells in which it was an initial event. The increased mitochondrial membrane potential found in F258 cells was not observed in Hepa1c1c7 cells. Surprisingly, F258 cells cultured at low cell density were somewhat more sensitive to low (50nM) B[a]P concentrations than Hepa1c1c7 cells. This could be explained partly by metabolic differences at low B[a]P concentrations. In contrast to the Hepa1c1c7 model, no activation of cell survival signals including p-Akt, p-ERK1/2 and no clear inactivation of pro-apoptotic Bad was observed in the F258 model following exposure to B[a]P. Another important difference between the two cell lines was related to the role of Bax and cytochrome c. In Hepa1c1c7 cells, B[a]P exposure resulted in a "classical" translocation of Bax to the mitochondria and release of cytochrome c, whereas in F258 cells no intracellular translocation of these two proteins was seen. These results suggest that the rate of metabolism of B[a]P and type of reactive metabolites formed influence the resulting balance of pro-apoptotic and anti-apoptotic cell signaling, and hence the mechanisms involved in cell death and the chances of more permanent genetic damage.
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Affiliation(s)
- Jørn A Holme
- Division of Environmental Medicine, Norwegian Institute of Public Health, P.O. Box 4404 Nydalen, N-0403 Oslo, Norway.
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15
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Gorria M, Huc L, Sergent O, Rebillard A, Gaboriau F, Dimanche-Boitrel MT, Lagadic-Gossmann D. Protective effect of monosialoganglioside GM1 against chemically induced apoptosis through targeting of mitochondrial function and iron transport. Biochem Pharmacol 2006; 72:1343-53. [PMID: 16962073 DOI: 10.1016/j.bcp.2006.07.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2006] [Revised: 06/29/2006] [Accepted: 07/18/2006] [Indexed: 11/22/2022]
Abstract
Exogenous treatment with monosialoganglioside GM1 has been described to afford protection against different apoptotic insults. However, the underlying mechanisms remain to be determined. In this study, we focused on the effect of GM1 on the apoptotic cascade induced by benzo[a]pyrene (B[a]P) in rat hepatic F258 epithelial cells. We first demonstrated that a co-treatment with GM1 (80 microM) reduced B[a]P (50 nM)-induced apoptosis as evidenced by a decrease of both cell population exhibiting nuclear fragmentation and caspase 3 cleavage and activity. We next showed that the p53 phosphorylation and nuclear translocation as well as the intracellular alkalinization related to Na+/H+ exchanger 1 (NHE1) activation, two early events of the apoptosis induced by B[a]P, were not inhibited by GM1. In contrast, the late mitochondria-dependent acidification elicited by B[a]P was inhibited by GM1 co-treatment, and an inhibition of the oxidative stress was also observed. Because GM1 has been shown to reduce the low-molecular weight iron content related to ethanol-induced oxidative stress, we finally investigated the involvement of iron under our conditions. Using the two iron chelators deferiprone and desferrioxamine, we clearly showed that iron played an important role in B[a]P-induced apoptosis in F258 cells, and that B[a]P-treatment resulted in a significant GM1-sensitive increase in (55)Fe uptake. In conclusion, our results indicate that exogenous GM1 partly prevents B[a]P-induced apoptosis by interfering with mitochondria-related intracellular acidification and iron transport.
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Affiliation(s)
- Morgane Gorria
- INSERM U620, Faculté de Pharmacie, Université Rennes 1, IFR140, 2 av Pr Léon Bernard, Rennes Cedex, France
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16
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Huc L, Rissel M, Solhaug A, Tekpli X, Gorria M, Torriglia A, Holme JA, Dimanche-Boitrel MT, Lagadic-Gossmann D. Multiple apoptotic pathways induced by p53-dependent acidification in benzo[a]pyrene-exposed hepatic F258 cells. J Cell Physiol 2006; 208:527-37. [PMID: 16688778 DOI: 10.1002/jcp.20686] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAH), such as benzo[a]pyrene (B[a]P), are ubiquitous genotoxic environmental pollutants. Their DNA-damaging effects lead to apoptosis induction, through similar pathways to those identified after exposure to other DNA-damaging stimuli with activation of p53-related genes and the involvement of the intrinsic apoptotic pathway. However, at a low concentration of B[a]P (50 nM), our previous results pointed to the involvement of intracellular pH (pHi) variations during B[a]P-induced apoptosis in a rat liver epithelial cell line (F258). In the present work, we identified the mitochondrial F0F1-ATPase activity reversal as possibly responsible for pHi decrease. This acidification not only promoted executive caspase activation, but also activated leucocyte elastase inhibitor/leucocyte-derived DNase II (LEI/L-DNase II) pathway. p53 appeared to regulate mitochondria homeostasis, by initiating F0F1-ATPase reversal and endonuclease G (Endo G) release. In conclusion, a low dose of B[a]P induced apoptosis by recruiting a large panel of executioners apparently depending on p53 phosphorylation and, for some of them, on acidification.
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Affiliation(s)
- Laurence Huc
- Inserm U620, Université Rennes 1, IFR 140, Rennes, France
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Rufa A, Dotti MT, Cardaioli E, Da Pozzo P, Federico A. Leber Hereditary Optic Neuropathy in 2 of 4 Siblings with 11778 mtDNA Mutation: Clinical Variability or Effect of Toxic Environmental Exposure? Eur Neurol 2004; 53:32-4. [PMID: 15711068 DOI: 10.1159/000083927] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2004] [Accepted: 10/20/2004] [Indexed: 11/19/2022]
Abstract
Although mitochondrial (mt) DNA mutation at nucleotide position 11778 accounts for most cases of Leber's hereditary optic neuropathy (LHON), the phenotypic expression may vary greatly even in different members of the same family. The possible influence of exogenous toxicity on phenotypic expression is still debated in LHON. Here we describe 4 siblings carrying the 11778 mtDNA mutation with a different phenotype. The index case developed an atypical optic neuropathy at the age of 60 years after a long history of occupational exposure to polycyclic aromatic hydrocarbons (PAHs). This report underlines a number of unanswered questions about phenotypic variability of LHON including the possible influence of PAH toxicity.
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Affiliation(s)
- Alessandra Rufa
- Department of Neurological and Behavioral Sciences, Medical School, University of Siena, Siena, Italy
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18
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Lagadic-Gossmann D, Huc L, Lecureur V. Alterations of intracellular pH homeostasis in apoptosis: origins and roles. Cell Death Differ 2004; 11:953-61. [PMID: 15195071 DOI: 10.1038/sj.cdd.4401466] [Citation(s) in RCA: 365] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Intracellular pH (pHi) has an important role in the maintenance of normal cell function, and hence this parameter has to be tightly controlled within a narrow range, largely through the activity of transporters located at the plasma membrane. These transporters can be modulated by endogenous or exogenous molecules as well as, in some pathological situations, leading to pHi changes that have been implicated in both cell proliferation and cell death. Whereas intracellular alkalinization seems to be a common feature of proliferative processes, the precise role of pHi in apoptosis is still unclear. The present review gathers the most recent advances along with previous data on both the origin and the role of pHi alterations in apoptosis and highlights the major concerns that merit further research in the future. Special attention is given to the possible role played by pHi-regulating transporters.
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Affiliation(s)
- D Lagadic-Gossmann
- INSERM UMR 620, Faculté des Sciences Pharmaceutiques et Biologiques, Université Rennes I, 2 av Pr Léon Bernard, 35 043 Rennes cedex, France.
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