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Zhang HW, Tsai ZR, Kok VC, Peng HC, Chen YH, Tsai JJP, Hsu CY. Long-term ambient hydrocarbon exposure and incidence of urinary bladder cancer. Sci Rep 2022; 12:20799. [PMID: 36460770 PMCID: PMC9718740 DOI: 10.1038/s41598-022-25425-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 11/29/2022] [Indexed: 12/02/2022] Open
Abstract
Particulate matter and volatile organic compounds, including total hydrocarbons (THCs), are major ambient air pollutants. Primary nonmethane hydrocarbons (NMHCs) originate from vehicle emissions. The association between air pollution and urinary bladder cancer (UBC) is debatable. We investigated whether long-term exposure to ambient hydrocarbons increases UBC risk among people aged ≥ 20 years in Taiwan. Linkage dataset research with longitudinal design was conducted among 589,135 initially cancer-free individuals during 2000-2013; 12 airborne pollutants were identified. Several Cox models considering potential confounders were employed. The study outcomes were invasive or in situ UBC incidence over time. The targeted pollutant concentration was divided into three tertiles: T1/T2/T3. The mean age of individuals at risk was 42.5 (SD 15.7), and 50.5% of the individuals were men. The mean daily average over 10 years of airborne THC concentration was 2.25 ppm (SD 0.13), and NMHC was 0.29 ppm (SD 0.09). Both pollutants show long-term monotonic downward trend over time using the Mann-Kendall test. There was a dose-dependent increase in UBC at follow-up. UBC incidence per 100,000 enrollees according to T1/T2/T3 exposure to THC was 60.9, 221.2, and 651.8, respectively; it was 170.0/349.5/426.7 per 100,000 enrollees, corresponding to T1/T2/T3 exposure to NMHC, respectively. Without controlling for confounding air pollutants, the adjusted hazard ratio (adj.HR) was 1.83 (95% CI 1.75-1.91) per 0.13-ppm increase in THC; after controlling for PM2.5, adj.HR was even higher at 2.09 (95% CI 1.99-2.19). The adj.HR was 1.37 (95% CI 1.32-1.43) per 0.09-ppm increase in ambient NMHC concentration. After controlling for SO2 and CH4, the adj.HR was 1.10 (95% CI 1.06-1.15). Sensitivity analyses showed that UBC development risk was not sex-specific or influenced by diabetes status. Long-term exposure to THC and NMHC may be a risk factor for UBC development. Acknowledging pollutant sources can inform risk management strategies.
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Affiliation(s)
- Han-Wei Zhang
- Program for Aging, China Medical University, Taichung, Taiwan
- Institute of Population Health Sciences, National Health Research Institutes, Miaoli, Taiwan
- Institute of Electrical Control Engineering, Department of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
- Biomedica Corporation, New Taipei, Taiwan
| | - Zhi-Ren Tsai
- Department of Computer Science and Information Engineering, Asia University, Taichung, Taiwan
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
- Center for Precision Medicine Research, Asia University, Taichung, Taiwan
| | - Victor C Kok
- Department of Bioinformatics and Medical Engineering, Asia University, Taichung, Taiwan.
- Division of Medical Oncology, Kuang Tien General Hospital Cancer Center, 117 Shatien Rd Shalu Dist., Taichung, 43303, Taiwan.
| | | | - Yau-Hung Chen
- Department of Chemistry, Tamkang University, New Taipei City, 25137, Taiwan
| | - Jeffrey J P Tsai
- Center for Precision Medicine Research, Asia University, Taichung, Taiwan
- Department of Bioinformatics and Medical Engineering, Asia University, Taichung, Taiwan
| | - Chung Y Hsu
- Graduate Institute of Biomedical Science, China Medical University, Taichung, Taiwan
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Allah A Fawzy M, Allah A Mohamed M, Rashad RR, Elgendy YA, Abdelazeem HE, Rabea MZ, Andraws ME, Abdo Sewera AM, Ali AM, T Hafez M, Emara AA, A Hussein M. MP-SeNPs; A Promising Cytokines Suppressor in Benzo[a]pyrene-Induced Mammal Tissue Injury in Rats. Pak J Biol Sci 2021; 24:895-904. [PMID: 34486357 DOI: 10.3923/pjbs.2021.895.904] [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] [Indexed: 11/15/2022]
Abstract
<b>Background and Objective:</b> <i>Moringa peregrina</i> (family Moringaceae) is a common flowering plant found in the Arabian Peninsula, Horn of Africa and Southern Sinai, Egypt. The purpose of this study was to investigate the protective activity of MP-SeNPs against BaP-induced mammal tissue injury in rats. <b>Materials and Methods:</b> MP-SeNPs were prepared and characterized in terms of particle size and zeta potential. Furthermore, the IC<sub>50</sub> of MP-SeNPs against the Mcf7 breast carcinoma cell line and LD<sub>50</sub> was evaluated. Adult albino rats weighing approximately 187±10 g was used to assess the lung protective activity of MP-SeNPs (28.7 and 71.75 mg kg<sup>1</sup> b.wt.) against BaP-induced mammal tissue injury in rats. <b>Results:</b> The mean particle size of MP-SeNPs was 134.69±8.24 nm with negative zeta potential of +26.04 with the observed shapes of nano particle was spherical. Also, IC<sub>50</sub> of MP-SeNPs against Mcf7 breast carcinoma cell line = 89.57 μg mL<sup>1</sup> and LD<sub>50</sub> equals and 1435 mg kg<sup>1</sup> b.wt., respectively. The daily oral administration of MP-SeNPs at concentrations of 28.7 and 71.75 mg kg<sup>1</sup> b.wt. for 30 days to rats treated with BaP (20 mg kg<sup>1</sup> b.wt.) resulted in a significant improvement of IL-2, IL-6 and IL-10. Oral administration of MP-SeNPs, on the other hand, increased the levels of SOD, GPx, TNF-α, iNOs and GSH as well as decreased the level of MDA in mammal tissue of BaP-treated rats. Furthermore, MP-SeNPs almost normalized these effects in mammal tissue histoarchitecture and MRI examination. <b>Conclusion:</b> The biochemical, histological and MRI findings incurrent study demonstrated that MP-SeNPs have protective activity against BaP-induced mammal tissue injury in rats.
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Adamowicz J, Juszczak K, Poletajew S, Van Breda SV, Pokrywczynska M, Drewa T. Scented Candles as an Unrecognized Factor that Increases the Risk of Bladder Cancer; Is There Enough Evidence to Raise a Red Flag? Cancer Prev Res (Phila) 2019; 12:645-652. [PMID: 31399420 DOI: 10.1158/1940-6207.capr-19-0093] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 06/11/2019] [Accepted: 08/01/2019] [Indexed: 12/24/2022]
Abstract
The causes of bladder cancer are not yet fully uncovered, however the research has identified a number of factors that may increase the risk of developing this cancer. The chemical carcinogenesis of bladder cancer due to chronic exposure to aromatic hydrocarbons has been well-established. The identification of this correlation led to an improvement of safety measures in chemical industry and a gradual decrease of bladder cancer cases among workers. Nevertheless, in the majority of bladder cancer cases, the specific cause of the disease still can't be specified. It makes the question of unrecognized factors associated with bladder cancer development even more relevant. Taking under consideration known chemical carcinogenesis of bladder cancer, this minireview takes under investigation the possible link between using scented candles and a risk of bladder cancer development. Burning scented candles contain many of the substances that are associated with a bladder cancer. Furthermore the scented candles are not only very popular but also widely available on the market, with limited quality regulations and unspecified raw materials determining a spectrum of potentially dangerous substances emitted during burning.
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Affiliation(s)
- Jan Adamowicz
- Chair of Urology, Department of Regenerative Medicine, Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland.
| | | | | | | | - Marta Pokrywczynska
- Chair of Urology, Department of Regenerative Medicine, Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland
| | - Tomasz Drewa
- Chair of Urology, Department of Regenerative Medicine, Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland
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Pushparajah DS, Plant KE, Plant NJ, Ioannides C. Synergistic and antagonistic interactions of binary mixtures of polycyclic aromatic hydrocarbons in the upregulation of CYP1 activity and mRNA levels in precision-cut rat liver slices. ENVIRONMENTAL TOXICOLOGY 2017; 32:764-775. [PMID: 27099206 DOI: 10.1002/tox.22276] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Revised: 04/04/2016] [Accepted: 04/05/2016] [Indexed: 06/05/2023]
Abstract
The current studies investigate whether synergistic or antagonistic interactions in the upregulation of CYP1 activity occur in binary mixtures of polycyclic aromatic hydrocarbons (PAHs) involving benzo[a]pyrene and five other structurally diverse PAHs of varying carcinogenic activity. Precision-cut rat liver slices were incubated with benzo[a]pyrene alone or in combination with a range of concentrations of a second PAH, and ethoxyresorufin O-deethylase, CYP1A1 and CYP1B1 mRNA levels determined. Concurrent incubation of benzo[a]pyrene with either dibenzo[a,h]anthracene or fluoranthene in liver slices led to a synergistic interaction, at least at low concentrations, in that ethoxyresorufin O-deethylase activity was statistically higher than the added effects when the slices were incubated with the individual compounds. In contrast, benzo[b]fluoranthene and, at high doses only, dibenzo[a,l]pyrene gave rise to antagonism, whereas 1-methylphenanthrene had no effect at all concentrations studied. When CYP1A1 mRNA levels were monitored, benzo[b]fluoranthene gave rise to an antagonistic response when incubated with benzo[a]pyrene, whereas all other compounds displayed synergism, with 1-methylphenathrene being the least effective. A similar picture emerged when CYP1B1 mRNA levels were determined, though the effects were less pronounced. In conclusion, it has been demonstrated that the benzo[a]pyrene-mediated upregulation of CYP1, at the mRNA and activity levels, is synergistically and antagonistically modulated by other PAHs. © 2016 Wiley Periodicals, Inc. Environ Toxicol 32: 764-775, 2017.
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Affiliation(s)
- Daphnee S Pushparajah
- Molecular Toxicology Group, Department of Biochemistry, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
| | - Kathryn E Plant
- Molecular Toxicology Group, Department of Biochemistry, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
| | - Nick J Plant
- Molecular Toxicology Group, Department of Biochemistry, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
| | - Costas Ioannides
- Molecular Toxicology Group, Department of Biochemistry, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
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Moorthy B, Chu C, Carlin DJ. Polycyclic aromatic hydrocarbons: from metabolism to lung cancer. Toxicol Sci 2016; 145:5-15. [PMID: 25911656 DOI: 10.1093/toxsci/kfv040] [Citation(s) in RCA: 434] [Impact Index Per Article: 54.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Excessive exposure to polycyclic aromatic hydrocarbons (PAHs) often results in lung cancer, a disease with the highest cancer mortality in the United States. After entry into the lung, PAHs induce phase I metabolic enzymes such as cytochrome P450 (CYP) monooxygenases, i.e. CYP1A1/2 and 1B1, and phase II enzymes such as glutathione S-transferases, UDP glucuronyl transferases, NADPH quinone oxidoreductases (NQOs), aldo-keto reductases (AKRs), and epoxide hydrolases (EHs), via the aryl hydrocarbon receptor (AhR)-dependent and independent pathways. Humans can also be exposed to PAHs through diet, via consumption of charcoal broiled foods. Metabolism of PAHs through the CYP1A1/1B1/EH pathway, CYP peroxidase pathway, and AKR pathway leads to the formation of the active carcinogens diol-epoxides, radical cations, and o-quinones. These reactive metabolites produce DNA adducts, resulting in DNA mutations, alteration of gene expression profiles, and tumorigenesis. Mutations in xenobiotic metabolic enzymes, as well as polymorphisms of tumor suppressor genes (e.g. p53) and/or genes involved in gene expression (e.g. X-ray repair cross-complementing proteins), are associated with lung cancer susceptibility in human populations from different ethnicities, gender, and age groups. Although various metabolic activation/inactivation pathways, AhR signaling, and genetic susceptibilities contribute to lung cancer, the precise points at which PAHs induce tumor initiation remain unknown. The goal of this review is to provide a current state-of-the-science of the mechanisms of human lung carcinogenesis mediated by PAHs, the experimental approaches used to study this complex class of compounds, and future directions for research of these compounds.
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Affiliation(s)
- Bhagavatula Moorthy
- *Department of Pediatrics, Baylor College of Medicine, Houston, Texas and Division of Extramural Research and Training, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
| | - Chun Chu
- *Department of Pediatrics, Baylor College of Medicine, Houston, Texas and Division of Extramural Research and Training, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
| | - Danielle J Carlin
- *Department of Pediatrics, Baylor College of Medicine, Houston, Texas and Division of Extramural Research and Training, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
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Plöttner S, Bastian LA, Käfferlein HU, Brüning T. Effects of benzo[a]pyrene, aromatic amines, and a combination of both on CYP1A1 activities in RT-4 human bladder papilloma cells. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2016; 79:1106-1117. [PMID: 27924717 DOI: 10.1080/15287394.2016.1219598] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The interaction of arylamines and polycyclic aromatic hydrocarbons (PAH) is of particular interest in the etiology of bladder cancer. The aim of this study was to (1) examine the metabolic capacity of RT-4 human bladder papilloma cells and (2) investigate the influence of aromatic amines on the induction of cytochrome P-450 1A1 (CYP1A1) activity and their effects on benzo[a]pyrene (BaP)-induced CYP1A1 activities. Cells were incubated for 24 h with different concentrations of BaP, 1- or 2-naphthylamine (NA), 2-, 3-, or 4-aminobiphenyl (ABP), and binary mixtures consisting of 1 µM BaP and different concentrations of each arylamine. Changes in CYP1A1 activities were measured at concentrations with no or only low cytotoxicity and accompanied by specific protein detection. Several phase I and II enzymes relevant to metabolism of PAH and arylamines were present in RT-4 cells. Concentration-dependent elevation in CYP1A1 activities accompanied by increasing protein levels was found after treating cells with BaP and 1- or 2-NA. The majority of synergistic effects in binary mixtures were less than additive. In contrast, concentration-dependent inhibition was observed for 2-, 3-, and 4-ABP and in both the presence and absence of BaP. Our results suggest that RT-4 cells represent a reliable model cell line to study arylamine- and PAH-induced effects in vitro and that BaP-induced CYP1A1 activities are modulated by aromatic amines. In general, the direction of the effect depends upon the aromatic amine, rather than being unidirectional for aromatic amines.
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Affiliation(s)
- Sabine Plöttner
- a Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA) , Bochum , Germany
| | - Lilian Annika Bastian
- a Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA) , Bochum , Germany
| | - Heiko Udo Käfferlein
- a Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA) , Bochum , Germany
| | - Thomas Brüning
- a Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr-University Bochum (IPA) , Bochum , Germany
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Juricek L, Bui LC, Busi F, Pierre S, Guyot E, Lamouri A, Dupret JM, Barouki R, Coumoul X, Rodrigues-Lima F. Activation of the aryl hydrocarbon receptor by carcinogenic aromatic amines and modulatory effects of their N-acetylated metabolites. Arch Toxicol 2014; 89:2403-12. [PMID: 25224404 DOI: 10.1007/s00204-014-1367-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Accepted: 09/04/2014] [Indexed: 12/02/2022]
Abstract
Aromatic amines (AAs) are an important class of chemicals which account for 12 % of known carcinogens. The biological effects of AAs depend mainly on their biotransformation into reactive metabolites or into N-acetylated metabolites which are generally considered as less toxic. Although the activation of the aryl hydrocarbon receptor (AhR) pathway by certain carcinogenic AAs has been reported, the effects of their N-acetylated metabolites on the AhR have not been addressed. Here, we investigated whether carcinogenic AAs and their N-acetylated metabolites may activate/modulate the AhR pathway in the absence and/or the presence of a bona fide AhR ligand (benzo[a]pyrene/B(a)P]. In agreement with previous studies, we found that certain AAs activated the AhR in human liver and lung cells as assessed by an increase in cytochrome P450 1A1 (CYP1A1) expression and activity. Altogether, we report for the first time that these properties can be modulated by the N-acetylation status of the AA. Whereas 2-naphthylamine significantly activated the AhR and induced CYP1A1 expression, its N-acetylated metabolite was less efficient. In contrast, the N-acetylated metabolite of 2-aminofluorene was able to significantly activate AhR, whereas the parent AA, 2-aminofluorene, did not. In the presence of B(a)P, activation of AhR or antagonist effects were observed depending on the AA or its N-acetylated metabolite. Activation and/or modulation of the AhR pathway by AAs and their N-acetylated metabolites may represent a novel mechanism contributing to the toxicological effects of AAs. More broadly, our data suggest biological interactions between AAs and other classes of xenobiotics through the AhR pathway.
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Affiliation(s)
- Ludmila Juricek
- INSERM UMR-S 1124, Toxicologie Pharmacologie et Signalisation cellulaire, 45 rue des Saints-Pères, 75006, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, 45 rue des Saints-Pères, 75006, Paris, France
| | - Linh-Chi Bui
- CNRS EAC 4413, Biologie Fonctionnelle et Adaptative, Université Paris Diderot, Sorbonne Paris Cité, 4 rue Marie-Andrée Lagroua Weill Hallé, 75213, Paris, France
| | - Florent Busi
- CNRS EAC 4413, Biologie Fonctionnelle et Adaptative, Université Paris Diderot, Sorbonne Paris Cité, 4 rue Marie-Andrée Lagroua Weill Hallé, 75213, Paris, France
| | - Stéphane Pierre
- INSERM UMR-S 1124, Toxicologie Pharmacologie et Signalisation cellulaire, 45 rue des Saints-Pères, 75006, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, 45 rue des Saints-Pères, 75006, Paris, France
| | - Erwan Guyot
- INSERM UMR-S 1124, Toxicologie Pharmacologie et Signalisation cellulaire, 45 rue des Saints-Pères, 75006, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, 45 rue des Saints-Pères, 75006, Paris, France
| | - Aazdine Lamouri
- Laboratoire ITODYS, CNRS UMR 7086, Université Paris Diderot, Sorbonne Paris Cité, 15, rue Jean-Antoine de Baïf, 75013, Paris, France
| | - Jean-Marie Dupret
- CNRS EAC 4413, Biologie Fonctionnelle et Adaptative, Université Paris Diderot, Sorbonne Paris Cité, 4 rue Marie-Andrée Lagroua Weill Hallé, 75213, Paris, France
| | - Robert Barouki
- INSERM UMR-S 1124, Toxicologie Pharmacologie et Signalisation cellulaire, 45 rue des Saints-Pères, 75006, Paris, France
- Université Paris Descartes, Sorbonne Paris Cité, 45 rue des Saints-Pères, 75006, Paris, France
- Service de biochimie métabolique, AP-HP, Hôpital Necker-Enfants Malades, 149 rue de Sèvres, 75743, Paris, France
| | - Xavier Coumoul
- INSERM UMR-S 1124, Toxicologie Pharmacologie et Signalisation cellulaire, 45 rue des Saints-Pères, 75006, Paris, France.
- Université Paris Descartes, Sorbonne Paris Cité, 45 rue des Saints-Pères, 75006, Paris, France.
| | - Fernando Rodrigues-Lima
- CNRS EAC 4413, Biologie Fonctionnelle et Adaptative, Université Paris Diderot, Sorbonne Paris Cité, 4 rue Marie-Andrée Lagroua Weill Hallé, 75213, Paris, France.
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Bolt HM. Causation of human urothelial cancer: there are challenging new data! Arch Toxicol 2014; 88:1769-70. [PMID: 25155193 DOI: 10.1007/s00204-014-1339-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2014] [Accepted: 08/13/2014] [Indexed: 01/20/2023]
Affiliation(s)
- Hermann M Bolt
- Leibniz Research Centre for Working Environment and Human Factors at the TU Dortmund (IfADo), Ardeystr. 67, 44139, Dortmund, Germany,
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Gundert-Remy U, Bernauer U, Blömeke B, Döring B, Fabian E, Goebel C, Hessel S, Jäckh C, Lampen A, Oesch F, Petzinger E, Völkel W, Roos PH. Extrahepatic metabolism at the body's internal–external interfaces. Drug Metab Rev 2014; 46:291-324. [DOI: 10.3109/03602532.2014.900565] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Gábelová A, Poláková V, Prochazka G, Kretová M, Poloncová K, Regendová E, Luciaková K, Segerbäck D. Sustained induction of cytochrome P4501A1 in human hepatoma cells by co-exposure to benzo[a]pyrene and 7H-dibenzo[c,g]carbazole underlies the synergistic effects on DNA adduct formation. Toxicol Appl Pharmacol 2013; 271:1-12. [DOI: 10.1016/j.taap.2013.04.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 04/09/2013] [Accepted: 04/10/2013] [Indexed: 12/11/2022]
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Verma N, Pink M, Petrat F, Rettenmeier AW, Schmitz-Spanke S. Exposure of primary porcine urothelial cells to benzo(a)pyrene: in vitro uptake, intracellular concentration, and biological response. Arch Toxicol 2012; 86:1861-71. [PMID: 22790669 DOI: 10.1007/s00204-012-0899-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Accepted: 06/26/2012] [Indexed: 12/31/2022]
Abstract
More than 90 % of all bladder cancers are transitional cell carcinomas arising from the cells lining the inside of the hollow organ (uroepithelium). Cell cultures from primary urinary bladder epithelial cells (PUBEC) of pigs were established to assess the uptake, intracellular concentration, and subcellular distribution of the environmental pollutant benzo(a)pyrene (BaP). During treatment of the cells with 0.5 μM BaP for up to 24 h, intracellular concentration of BaP increased without saturation but with marked differences between various PUBEC pools. Analysis of BaP uptake by laser scanning microscopy indicated that BaP is rapidly partitioned into the cell membrane, while only a slight but significant increase in BaP fluorescence intensity was observed in the cytosol and nucleus. Spectrofluorometric quantification of BaP in PUBEC using ex situ calibration revealed a strong accumulation of BaP, leading to intracellular concentrations ranging from 7.28 to 35.70 μM in cells exposed to 0.5 μM BaP and from 29.9 to 406.64 μM in cells exposed to 10 μM BaP. These results were confirmed by gas chromatographic mass spectrometric analysis. Apoptotic cell nuclei were assessed by TUNEL analysis to see whether BaP exposure at the given concentrations results in a toxic effect. While apoptotic cells were barely detectable in control epithelial cells, there was a marked elevation in apoptosis in the BaP-exposed cells. In conclusion, a comprehensive study on uptake and quantification of BaP in epithelial cells from pig bladder is reported for the first time. The study may be helpful in understanding the pattern of BaP uptake and distribution in bladder and its possible implication in bladder cancer development.
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Affiliation(s)
- Nisha Verma
- Institute of Hygiene and Occupational Medicine, University Hospital Essen, Hufelandstrasse 55, 45122, Essen, Germany.
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12
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Internal exposure to carcinogenic polycyclic aromatic hydrocarbons and DNA damage: a null result in brief. Arch Toxicol 2012; 86:1317-21. [DOI: 10.1007/s00204-012-0882-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Accepted: 05/29/2012] [Indexed: 02/01/2023]
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13
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Föllmann W, Blaszkewicz M, Behm C, Degen GH, Golka K. N-Acetylation of p-aminobenzoic acid and p-phenylenediamine in primary porcine urinary bladder epithelial cells and in the human urothelial cell line 5637. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2012; 75:1206-1215. [PMID: 22994574 DOI: 10.1080/15287394.2012.709167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
N-Acetyltransferases (NAT) are important enzymes in the metabolism of certain carcinogenic arylamines, as N-acetylation decreases or prevents their bioactivation via N-hydroxylation. To study such processes in the bladder, cell culture models may be used, but metabolic competence needs to be characterized. This study focused on the N-acetylation capacity of two urothelial cell systems, using p-aminobenzoic acid (PABA) and the hair dye precursor p-phenylenediamine (PPD), two well-known substrates of the enzyme NAT1. The constitutive NAT1 activity was investigated using primary cultures of porcine urinary bladder epithelial cells (PUBEC) and in the human urothelial cell line 5637 to assess their suitability for further in vitro studies on PABA and PPD-induced toxicity. N-Acetylation of PABA and PPD was determined by high-performance liquid chromatography (HPLC) analysis in cytosols of the two cell systems upon incubation with various substrate levels for up to 60 min. The primary PUBEC revealed higher N-acetylation rates (2.5-fold for PABA, 5-fold for PPD) compared to the 5637 cell line, based on both PABA conversion to its acetylated metabolite and formation of mono- and diacetylated PPD. The urothelial cell systems may thus be useful as a tool for further studies on the N-acetylation of aromatic amines via NAT1.
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Affiliation(s)
- Wolfram Föllmann
- Leibniz Research Centre for Working Environment and Human Factors (IfADo), Dortmund, Germany.
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Plöttner S, Behm C, Bolt HM, Föllmann W. Effects of cigarette smoke condensate on primary urothelial cells in vitro. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2012; 75:1194-1205. [PMID: 22994573 DOI: 10.1080/15287394.2012.709166] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Cigarette smoking is a risk factor for bladder cancer. Since urothelial cells express phase I and II enzymes these cells are able to metabolize precarcinogens into DNA reactive intermediates. Cigarette smoke is a complex mixture containing at least 80 known carcinogens. In this context especially aromatic amines and polycyclic aromatic hydrocarbons are discussed as being responsible for bladder-carcinogenicity. Cell cultures of primary porcine urinary bladder epithelial cells (PUBEC) have been useful models for studies on bladder-specific effects. These cells are metabolically competent and found to be a valuable tool for examining effects of cigarette smoke constituents. In the present study PUBEC were utilized to investigate the effects of the complex mixture cigarette smoke condensate total particulate matter (CSC TPM) with emphasis on induction of cytochrome P-450 1A1 (CYP1A1) and genotoxic effects. CYP1A1 induction was investigated by Western blot and flow cytometry. The most pronounced effects were found after 24 h of incubation with 1-10 μg/ml CSC TPM. Maximal induction was observed at 5 μg/ml by flow cytometry and at 10 μg/ml by Western blot analysis. Genotoxic effects were investigated by means of alkaline single-cell gel electrophoresis ("comet assay") with and without the use of the DNA repair enzyme formamidopyrimidine-DNA glycosylase (Fpg) and the micronucleus (MN) test. A numerical concentration-dependent increase in Fpg-sensitive sites indicating oxidative DNA damage and a quantitative rise in MN formation were noted. The CSC utilized in this study contained low amounts of benzo[a]pyrene, 4-aminobiphenyl, and 2-naphthylamine. With regard to the observed CYP1A1 induction, these substances cannot explain the CYP1A1 inducing effect of CSC TPM. It is possible that other compounds within CSC TPM contribute to CYP1A1 induction in our cellular model.
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Affiliation(s)
- Sabine Plöttner
- Leibniz Research Centre for Working Environment and Human Factors (IfADo), Dortmund, Germany
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Contrast agent-induced nephrotoxicity: role of oxidative stress and apoptosis through the mitochondrial pathway. Arch Toxicol 2011; 85:163-4. [DOI: 10.1007/s00204-011-0666-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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16
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Huang RY, Chen GG. Cigarette smoking, cyclooxygenase-2 pathway and cancer. Biochim Biophys Acta Rev Cancer 2010; 1815:158-69. [PMID: 21147199 DOI: 10.1016/j.bbcan.2010.11.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 11/23/2010] [Accepted: 11/29/2010] [Indexed: 12/16/2022]
Abstract
Cigarette smoking is a major cause of mortality and morbidity worldwide. Cyclooxygenase (COX) and its derived prostanoids, mainly including prostaglandin E2 (PGE2), thromboxane A2 (TxA2) and prostacyclin (PGI2), have well-known roles in cardiovascular disease and cancer, both of which are associated with cigarette smoking. This article is focused on the role of COX-2 pathway in smoke-related pathologies and cancer. Cigarette smoke exposure can induce COX-2 expression and activity, increase PGE2 and TxA2 release, and lead to an imbalance in PGI2 and TxA2 production in favor of the latter. It exerts pro-inflammatory effects in a PGE2-dependent manner, which contributes to carcinogenesis and tumor progression. TxA2 mediates other diverse biologic effects of cigarette smoking, such as platelet activation, cell contraction and angiogenesis, which may facilitate tumor growth and metastasis in smokers. Among cigarette smoke components, nicotine and its derived nitrosamines 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) are the most potent carcinogens. COX-2 and PGE2 have been shown to play a pivotal role in many cancers associated with cigarette smoking, including cancers of lung, gastric and bladder, while the information for the role of TxA2 and PGI2 in smoke-associated cancers is limited. Recent findings from our group have revealed how NNK influences the TxA2 to promote the tumor growth. Better understanding in the above areas may help to generate new therapeutic protocols or to optimize the existing treatment strategy.
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Affiliation(s)
- Run-Yue Huang
- Department of Surgery, The Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
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Mechanisms of telomere maintenance and attrition: linking cancer and ageing. Arch Toxicol 2009; 83:405-6. [PMID: 19390840 DOI: 10.1007/s00204-009-0428-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Epoxide hydrolases are not only a molecular sponge sucking up genotoxic epoxides: new roles in control of blood pressure, inflammation as well as nociception and cell proliferation. Arch Toxicol 2009; 83:289-91. [PMID: 19333580 DOI: 10.1007/s00204-009-0422-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Bolt HM, Marchan R, Hengstler JG. Low-dose extrapolation in toxicology: an old controversy revisited. Arch Toxicol 2009; 83:197-8. [DOI: 10.1007/s00204-009-0413-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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