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Bercu JP, Zhang S, Sobol Z, Escobar PA, Van P, Schuler M. Comparison of the transgenic rodent mutation assay, error corrected next generation duplex sequencing, and the alkaline comet assay to detect dose-related mutations following exposure to N-nitrosodiethylamine. MUTATION RESEARCH. GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2023; 891:503685. [PMID: 37770142 DOI: 10.1016/j.mrgentox.2023.503685] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 08/17/2023] [Accepted: 08/23/2023] [Indexed: 10/03/2023]
Abstract
N-Nitrosodiethylamine (NDEA), a well-studied N-nitrosamine, was tested in rats to compare the dose-response relationship of three genotoxicity endpoints. Mutant / mutation frequencies were determined using the transgenic rodent (TGR) gene mutation assay and error corrected next generation sequencing (ecNGS) (i.e., duplex sequencing (DS)), and genetic damage was detected by the alkaline comet assay. Big Blue® (cII Locus) animals (n = 6 per dose group) were administered doses of 0.001, 0.01, 0.1, 1, 3 mg/kg/day NDEA by oral gavage. Samples were collected for cII mutation and DS analyses following 28-days of exposure and 3 days recovery. In a separate study, male Sprague-Dawley (SD) rats (n = 6 per dose group) were administered the same doses by oral gavage for two consecutive days and then samples collected for the alkaline comet assay. A dose-related increase in mutant / mutation frequencies of the liver but not duodenum was observed using the TGR assay and DS with DS resulting in a slightly more sensitive response, with a lower benchmark dose (BMD). In addition, a dose-related increase in percent tail DNA was observed in the liver using the alkaline comet assay. Therefore, DS and comet assays showed good utility for hazard identification and dose-response analysis of a representative N-nitrosamine comparable to the TGR gene mutation assay.
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Affiliation(s)
- Joel P Bercu
- Gilead Sciences, Inc., Nonclinical Safety and Pathobiology (NSP), Foster City, CA 94404, USA.
| | - Shaofei Zhang
- Pfizer Research, Development, and Medical, Groton, CT, USA.
| | | | | | - Phu Van
- TwinStrand Biosciences, Inc., Seattle, WA, USA
| | - Maik Schuler
- Pfizer Research, Development, and Medical, Groton, CT, USA
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El-Bayoumy K, Chen KM, Zhang SM, Sun YW, Amin S, Stoner G, Guttenplan JB. Carcinogenesis of the Oral Cavity: Environmental Causes and Potential Prevention by Black Raspberry. Chem Res Toxicol 2016; 30:126-144. [DOI: 10.1021/acs.chemrestox.6b00306] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
| | | | - Shang-Min Zhang
- Department
of Pathology, Yale University, Yale School of Medicine, New Haven, Connecticut 06510, United States
| | | | | | - Gary Stoner
- Department
of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, United States
| | - Joseph B. Guttenplan
- Department
of Basic Science, and Department of Environmental Medicine, New York University College of Dentistry and New York University School of Medicine, New York, New York 10010, United States
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Dionne KR, Warnakulasuriya S, Zain RB, Cheong SC. Potentially malignant disorders of the oral cavity: current practice and future directions in the clinic and laboratory. Int J Cancer 2014; 136:503-15. [PMID: 24482244 DOI: 10.1002/ijc.28754] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2013] [Revised: 01/12/2014] [Accepted: 01/15/2014] [Indexed: 12/28/2022]
Abstract
Despite commendable progress in the prevention, detection, and treatment of a wide variety of solid tumor types, oral squamous cell carcinoma (OSCC) remains a significant health burden across the globe. OSCC carcinogenesis involves accumulation of genetic alterations that coincide with the multistep malignant transformation of normal oral epithelium. OSCC is often first diagnosed at late stages of the disease (advanced regional disease and/or metastasis). Delayed diagnosis precludes successful treatment and favorable outcomes. In clinical practice, opportunities exist to identify patients with oral potentially malignant disorders (OPMDs), which precede the development of cancer. This review addresses the current status of laboratory and clinical research on OPMDs, with emphasis on leukoplakia and erythroplakia. OSF is also presented, though there is a paucity of published studies on this disorder. We focus on findings that could translate into earlier diagnosis and more efficacious treatment of those lesions with significant malignant potential. We explore how markers of OPMD malignant transformation might be implemented into current diagnostic practice to help clinicians objectively stratify patients into treatment/follow-up groups according to relative risk. We provide an overview of recently concluded and ongoing OPMD chemoprevention trials. We describe laboratory OPMD models that can be used to not only to reveal the genetic and molecular intricacies of oral cancer but also to develop novel screening methods and therapeutic approaches. Finally, we call for targeted screening programs of at-risk populations in order to facilitate diagnosis and treatment of OPMD and early OSCC.
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Affiliation(s)
- Kalen R Dionne
- Faculty of Dentistry, Oral Cancer Research and Co-ordinating Centre (OCRCC), University of Malaya, Kuala Lumpur, Malaysia; Oral Cancer Research Team, Cancer Research Initiatives Foundation (CARIF), Subang Jaya, Selangor Darul Ehsan, Malaysia; Medical Scientist Training Program, University of Colorado Denver-Anschutz Medical Campus, Aurora, CO
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Chen KM, Guttenplan JB, Zhang SM, Aliaga C, Cooper TK, Sun YW, DelTondo J, Kosinska W, Sharma AK, Jiang K, Bruggeman R, Ahn K, Amin S, El-Bayoumy K. Mechanisms of oral carcinogenesis induced by dibenzo[a,l]pyrene: an environmental pollutant and a tobacco smoke constituent. Int J Cancer 2013; 133:1300-9. [PMID: 23483552 PMCID: PMC3707976 DOI: 10.1002/ijc.28152] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2013] [Accepted: 02/22/2013] [Indexed: 12/27/2022]
Abstract
We previously reported that dibenzo[a,l]pyrene (DB[a,l]P), the most potent known environmental carcinogen among polycyclic aromatic hydrocarbons (PAH) congeners, is carcinogenic in the oral tissues of mice. We have now developed a new mouse model which employs the oral application of the fjord region diol epoxide, (±)-anti-11,12-dihydroxy-13,14-epoxy-11,12,13,14-tetrahydrodibenzo[a,l]pyrene (DB[a,l]PDE), a metabolite of the tobacco smoke constituent DB[a,l]P, and we show its specific induction of oral squamous cell carcinoma (OSCC) in both tongue and other oral tissues. Groups of B6C3F1 mice (20/group) received 6 or 3 nmol of (±)-anti-DB[a,l]PDE administered into the oral cavity; 3 times per week for 38 weeks. Additional groups received the vehicle alone or were left untreated. Mice were sacrificed 42 weeks after the first carcinogen administration. The high dose induced 74 and 100% OSCC in the tongue and other oral tissues, respectively; the corresponding values at the lower dose were 45 and 89%. Using immunohistochemistry, we showed that DB[a,l]PDE resulted in overexpression of p53 and COX-2 proteins in malignant tissues when compared to normal oral tissues and tongues. Consistent with the carcinogenicity, we demonstrated powerful mutagenicity in cII gene in B6C3F1 (Big Blue) mouse tongue. The mutational profile in lacI reporter gene is similar to those detected in human head and neck cancer, and p53 mutations were observed in mouse oral tumor tissues. Taken together, we conclude that the formation of diol epoxides plays a major role among the mechanisms by which DB[a,l]P exerts its oral mutagenicity and tumorigenicity.
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Affiliation(s)
- Kun-Ming Chen
- Dept. of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA 17033
| | - Joseph B. Guttenplan
- Dept. of Basic Sciences, New York University Medical School, New York, NY 10010
- Dept. of Environ. Med., New York University Medical School, New York, NY 10010
| | - Shang-Min Zhang
- Dept. of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA 17033
| | - Cesar Aliaga
- Dept. of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA 17033
| | - Timothy K. Cooper
- Dept. of Comparative Medicine, Penn State College of Medicine, Hershey, PA 17033
| | - Yuan-Wan Sun
- Dept. of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA 17033
| | - Joseph DelTondo
- Dept. of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA 17033
| | - Wieslawa Kosinska
- Dept. of Basic Sciences, New York University Medical School, New York, NY 10010
- Dept. of Environ. Med., New York University Medical School, New York, NY 10010
| | - Arun K. Sharma
- Dept. of Pharmacology, Penn State College of Medicine, Hershey, PA 17033
| | - Kun Jiang
- Dept. of Pathology, Penn State College of Medicine, Hershey, PA 17033
| | - Richard Bruggeman
- Dept. of Pathology, Penn State College of Medicine, Hershey, PA 17033
| | - Kwangmi Ahn
- Dept. of Public Health Sciences, Penn State College of Medicine, Hershey, PA 17033
| | - Shantu Amin
- Dept. of Pharmacology, Penn State College of Medicine, Hershey, PA 17033
| | - Karam El-Bayoumy
- Dept. of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA 17033
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Guttenplan JB, Kosinska W, Zhao ZL, Chen KM, Aliaga C, DelTondo J, Cooper T, Sun YW, Zhang SM, Jiang K, Bruggeman R, Sharma AK, Amin S, Ahn K, El-Bayoumy K. Mutagenesis and carcinogenesis induced by dibenzo[a,l]pyrene in the mouse oral cavity: a potential new model for oral cancer. Int J Cancer 2012; 130:2783-90. [PMID: 21815141 PMCID: PMC3596885 DOI: 10.1002/ijc.26344] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Accepted: 07/11/2011] [Indexed: 12/22/2022]
Abstract
Cancer of the oral cavity is a serious disease, affecting about 30,000 individuals in US annually. There are several animal models of oral cancer, but each has certain disadvantages. As a new model, we investigated whether topical application of the tobacco smoke carcinogen, dibenzo[a,l]pyrene (DB[a,l]P) is mutagenic and carcinogenic in the oral cavity of the B6C3F1 lacI and B6C3F1 mouse, respectively. B6C3F1 lacI mice received DB[a,l]P (0, 3, 6, 12 nmol) 3× per week. B6C3F1 mice received the same doses and also 24 nmol. At 38 weeks mutagenesis was measured in oral tissues in lacI mice. For the high dose group, the mutant fraction (MF) in upper mucosa and tongue increased about twofold relative to that in vehicle-alone. The increases were statistically significant. The mutational profile in the DB[a,l]P-induced mutants was compared with that induced by benzo[a]pyrene (BaP) in oral tissue. BaP is mutagenic in many tissues when administered by gavage. The mutational profile for DB[a,l]P was more similar to that reported for p53 mutations in head and neck cancers than was that of BaP. At 47 weeks, oral squamous cell carcinomas (OSCC) were found in 31% of the high-dose B6C3F1 group. Elevations of p53 and COX-2 protein were observed in tumor and dysplastic tissue. As DB[a,l]P induces mutations and tumors in the oral cavity, and has a mutational profile in oral tissue similar to that found in p53 in human OSCC, the treatment protocol described here may represent a new and relevant model for cancer of the oral cavity.
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Affiliation(s)
- Joseph B. Guttenplan
- Department of Basic Science New York Univ. College of Dentistry, New York, NY
- Department of Environmental Medicine New York Univ. School of Medicine, New York, NY
| | - Wieslawa Kosinska
- Department of Basic Science New York Univ. College of Dentistry, New York, NY
| | - Zhong-Lin Zhao
- Department of Basic Science New York Univ. College of Dentistry, New York, NY
| | - Kun-Ming Chen
- Department of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA
| | - Cesar Aliaga
- Department of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA
| | - Joseph DelTondo
- Department of Pathology, Penn State College of Medicine, Hershey, PA
| | - Timothy Cooper
- Department of Comparative Medicine, Penn State College of Medicine, Hershey, PA
| | - Yuan-Wan Sun
- Department of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA
| | - Shang-Min Zhang
- Department of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA
| | - Kun Jiang
- Department of Pathology, Penn State College of Medicine, Hershey, PA
| | - Richard Bruggeman
- Department of Pathology, Penn State College of Medicine, Hershey, PA
| | - Arun K. Sharma
- Department of Pharmacology, Penn State College of Medicine, Hershey, PA
| | - Shantu Amin
- Department of Pharmacology, Penn State College of Medicine, Hershey, PA
| | - Kwangmi Ahn
- Department of Public Health Sciences, Penn State College of Medicine, Hershey, PA
| | - Karam El-Bayoumy
- Department of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA
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Sacks PG, Zhao ZL, Kosinska W, Fleisher KE, Gordon T, Guttenplan JB. Concentration dependent effects of tobacco particulates from different types of cigarettes on expression of drug metabolizing proteins, and benzo(a)pyrene metabolism in primary normal human oral epithelial cells. Food Chem Toxicol 2011; 49:2348-55. [PMID: 21722697 PMCID: PMC3182574 DOI: 10.1016/j.fct.2011.06.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 06/14/2011] [Accepted: 06/15/2011] [Indexed: 01/10/2023]
Abstract
The ability of tobacco smoke (TS) to modulate phase I and II enzymes and affect metabolism of tobacco carcinogens is likely an important factor in its carcinogenicity. For the first time several types of TS particulates (TSP) were compared in different primary cultured human oral epithelial cells (NOE) for their abilities to affect metabolism of the tobacco carcinogen, (BaP) to genotoxic products, and expression of drug metabolizing enzymes. TSP from, reference filtered (2RF4), mentholated (MS), reference unfiltered, (IR3), ultra low tar (UL), and cigarettes that primarily heat tobacco (ECL) were tested. Cells pretreated with TSP concentrations of 0.2-10 μg/ml generally showed increased rates of BaP metabolism; those treated with TSP concentrations above 10 μg/ml showed decreased rates. Effects of TSPs were similar when expressed on a weight basis. Weights of TSP/cigarette varied in the order: MS≈IR3>2RF4>ECL>UL. All TSPs induced the phase I proteins, cytochrome P450 1A1 (CYP1A1) and 1B1 (CYP1B1), phase II proteins, NAD(P)H dehydrogenase quinone 1 (NQO1), and microsomal glutathione S-transferase 1 (MGST1), and additionally, hydroxysteroid (17-beta) dehydrogenase 2 (HSD17B2), as assessed by qRT-PCR. The pattern of gene induction at probable physiological levels favored activation over detoxification.
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Affiliation(s)
- Peter G. Sacks
- New York University College of Dentistry, Dept of Basic Science, New York, NY 10010
| | - Zhong-Lin Zhao
- New York University College of Dentistry, Dept of Basic Science, New York, NY 10010
| | - Wieslawa Kosinska
- New York University College of Dentistry, Dept of Basic Science, New York, NY 10010
| | - Kenneth E. Fleisher
- New York University College of Dentistry, Dept of Basic Science, New York, NY 10010
| | - Terry Gordon
- NYU School of Medicine, Dept of Environmental Medicine, New York, NY 10010
| | - Joseph B. Guttenplan
- New York University College of Dentistry, Dept of Basic Science, New York, NY 10010
- NYU School of Medicine, Dept of Environmental Medicine, New York, NY 10010
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Steevens J, van den Brandt PA, Goldbohm RA, Schouten LJ. Selenium status and the risk of esophageal and gastric cancer subtypes: the Netherlands cohort study. Gastroenterology 2010; 138:1704-13. [PMID: 20006613 DOI: 10.1053/j.gastro.2009.12.004] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2009] [Revised: 10/28/2009] [Accepted: 12/03/2009] [Indexed: 12/02/2022]
Abstract
BACKGROUND & AIMS Selenium may protect against the development of esophageal squamous cell carcinoma (ESCC), esophageal adenocarcinoma (EAC), and gastric cardia adenocarcinoma (GCA). Only in very few studies have the associations with ESCC and GCA been investigated, and no epidemiologic studies exist on EAC. METHODS We studied the association between selenium and risk of ESCC, EAC, and GCA within the prospective Netherlands Cohort Study, conducted among 120,852 men and women aged 55-69 years at baseline. In September 1986, the cohort members completed a questionnaire on risk factors for cancer and provided toenail clippings for determination of baseline selenium status. After 16.3 years of follow-up, 64 ESCC, 112 EAC, and 114 GCA cases and 2072 subcohort members were available for case-cohort analysis. Incidence rate ratios (RR) were calculated using Cox proportional hazards models. RESULTS In multivariable analyses of selenium status, we found an inverse association with ESCC (RR(per standard unit increment), 0.80; 95% confidence interval [CI]: 0.67-0.96) and a borderline significant inverse association with GCA (RR, 0.91; 95% CI: 0.80-1.02). No overall association was observed for EAC (RR, 1.05; 95% CI: 0.95-1.15), but, for women and never smokers, significant inverse associations were found (RR(per standard unit increment), 0.72; 95% CI: 0.61-0.84 and RR(per standard unit increment), 0.74; 95% CI: 0.64-0.86, respectively). CONCLUSIONS This prospective study supports an inverse association between toenail selenium and risk of ESCC and GCA and suggests an inverse association with risk of EAC in subgroups (women, never smokers, and low antioxidant consumers). These associations need confirmation.
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Affiliation(s)
- Jessie Steevens
- GROW-School for Oncology and Developmental Biology, Department of Epidemiology, Maastricht University Medical Centre+, Maastricht, The Netherlands.
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Rosa RM, Moura DJ, Romano E Silva AC, Saffi J, Pêgas Henriques JA. Antioxidant activity of diphenyl diselenide prevents the genotoxicity of several mutagens in Chinese hamster V79 cells. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2007; 631:44-54. [PMID: 17507284 DOI: 10.1016/j.mrgentox.2007.04.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2007] [Revised: 04/03/2007] [Accepted: 04/04/2007] [Indexed: 12/28/2022]
Abstract
Diphenyl diselenide (DPDS) is an electrophilic reagent used in the synthesis of a variety of pharmacologically active organic selenium compounds. Studies have shown its antioxidant, hepatoprotective, neuroprotective, anti-inflammatory, and antinociceptive effects. We recently showed the antioxidant effect of DPDS in V79 cells, and established the beneficial and toxic doses of this compound in this cell line. Here, we report the antigenotoxic and antimutagenic properties of DPDS, investigated by using a permanent lung fibroblast cell line derived from Chinese hamsters. We determined the cytotoxicity by clonal survival assay, and evaluated DNA damage in response to several mutagens by comet assay and micronucleus test in binucleated cells. In the clonal survival assay, at concentrations ranging from 1.62 to 12.5microM, DPDS was not cytotoxic, while at concentrations up to 25microM, it significantly decreased survival. The treatment with this organoselenium compound at non-cytotoxic dose range increased cell survival after challenge with hydrogen peroxide, methyl-methanesulphonate, and UVC radiation, but did not protect against 8-methoxypsoralen plus UVA-induced cytotoxicity. In addition, the treatment prevented induced DNA damage, as verified in the comet assay. The mutagenic effect of these genotoxins, as measured by the micronucleus test, similarly attenuated or prevented cytotoxicity and DNA damage. Treatment with DPDS also decreased lipid peroxidation levels after exposure to hydrogen peroxide MMS, and UVC radiation, and increased glutathione peroxidase activity in the extracts. Our results clearly demonstrate that DPDS at low concentrations presents antimutagenic properties, which are most probably due to its antioxidant properties.
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Affiliation(s)
- Renato Moreira Rosa
- Departamento de Biofísica e Centro de Biotecnologia, Instituto de Biociências, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
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