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Hong SJ, Zhang XN, Sun Z, Zeng T. The potential health risks of N,N-dimethylformamide: An updated review. J Appl Toxicol 2024. [PMID: 38339870 DOI: 10.1002/jat.4590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 01/12/2024] [Accepted: 01/26/2024] [Indexed: 02/12/2024]
Abstract
N,N-dimethylformamide (DMF) is a universally used industrial material with exponential growth in production and consumption worldwide. The frequently reported occupational DMF poisoning cases in some countries and the gradually recognized unavoidable health risks to the general population highlight that DMF should still be a matter of concern. Previous studies have demonstrated that the liver is the primary target organ of DMF exposure and multiple mechanisms have been revealed. However, most of these studies investigate the detrimental effects of acute and subacute DMF exposure, while the effects of chronic DMF exposure are rarely studied. Furthermore, the key mechanism for the acute hepatotoxicity of DMF remains to be elucidated. Future research may focus on the identification of efficient preventive measures against the toxicity of DMF to occupational workers, the investigation of the detrimental effects of DMF at environmentally relevant doses, and the studies on the elimination and recycling of DMF in industrial wastes. Herein, we present an updated review of the metabolism of DMF, the biomarker of DMF exposure, underlying molecular mechanisms of DMF-induced hepatotoxicity, and the toxicity of DMF to both occupational workers and general populations and discuss the possible directions in future studies.
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Affiliation(s)
- Shu-Jun Hong
- Institute of Toxicology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Xiu-Ning Zhang
- Institute of Toxicology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Zhan Sun
- Institute of Physical and Chemical Analysis, Jinan Municipal Center for Disease Control and Prevention, Jinan, Shandong, China
| | - Tao Zeng
- Institute of Toxicology, School of Public Health, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
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2
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Marsh GM, Kruchten A. A reevaluation of selected mortality risks in the updated NCI/NIOSH acrylonitrile cohort study. Front Public Health 2023; 11:1122346. [PMID: 37089484 PMCID: PMC10117843 DOI: 10.3389/fpubh.2023.1122346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 02/24/2023] [Indexed: 04/25/2023] Open
Abstract
Objectives The study aimed to determine whether the National Cancer Institute's (NCI) recent suggestion of associations between acrylonitrile (AN) exposure and mortality in lung and bladder cancer and pneumonitis is robust to alternative methods of data analysis. Materials and methods We used the Richardson method to indirectly adjust risk ratios (RRs) in relation to AN exposure for potential confounding by smoking and asbestos. We repeated key analyses omitting workers from Plant 4 to account for possible local, historical shipyard-related asbestos exposures. Results The adjustment of lung cancer RRs for confounding by both smoking and asbestos and omitting Plant 4 workers yielded mostly decreased RRs and much less evidence of a positive association with cumulative AN exposure. Conclusion Overall, our reanalysis provided little evidence to support NCI's suggestion of associations between AN exposure and mortality in lung and bladder cancer and pneumonitis.
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Human Biomonitoring Initiative (HBM4EU): Human Biomonitoring Guidance Values Derived for Dimethylformamide. TOXICS 2022; 10:toxics10060298. [PMID: 35736906 PMCID: PMC9230076 DOI: 10.3390/toxics10060298] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/13/2022] [Accepted: 05/26/2022] [Indexed: 02/04/2023]
Abstract
Within the European Joint Program on Human Biomonitoring HBM4EU, human biomonitoring guidance values (HBM-GVs) for the general population (HBM-GVGenPop) or for occupationally exposed adults (HBM-GVWorker) are derived for prioritized substances including dimethylformamide (DMF). The methodology to derive these values that was agreed upon within the HBM4EU project was applied. A large database on DMF exposure from studies conducted at workplaces provided dose–response relationships between biomarker concentrations and health effects. The hepatotoxicity of DMF has been identified as having the most sensitive effect, with increased liver enzyme concentrations serving as biomarkers of the effect. Out of the available biomarkers of DMF exposure studied in this paper, the following were selected to derive HBM-GVWorker: total N-methylformamide (tNMF) (sum of N-hydroxymethyl-N-methylformamide and NMF) and N-acetyl-S-(N-methylcarbamoyl)cysteine (AMCC) in urine. The proposed HBM-GVWorker is 10 mg·L−1 or 10 mg·g−1 creatinine for both biomarkers. Due to their different half-lives, tNMF (representative of the exposure of the day) and AMCC (representative of the preceding days’ exposure) are complementary for the biological monitoring of workers exposed to DMF. The levels of confidence for these HBM-GVWorker are set to “high” for tNMF and “medium-low” for AMCC. Therefore, further investigations are required for the consolidation of the health-based HBM-GV for AMCC in urine.
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Kadukkattil Ramanunny A, Singh SK, Wadhwa S, Gulati M, Kapoor B, Khursheed R, Kuppusamy G, Dua K, Dureja H, Chellappan DK, Jha NK, Gupta PK, Vishwas S. Overcoming hydrolytic degradation challenges in topical delivery: non-aqueous nano-emulsions. Expert Opin Drug Deliv 2021; 19:23-45. [PMID: 34913772 DOI: 10.1080/17425247.2022.2019218] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Non-aqueous nano-emulsions (NANEs) are colloidal lipid-based dispersions with nano-sized droplets formed by mixing two immiscible phases, none of which happens to be an aqueous phase. Their ability to incorporate water and oxygen sensitive drugs without any susceptibility to degradation makes them the optimum dosage form for such candidates. In NANEs, polar liquids or polyols replace the aqueous phase while surfactants remain same as used in conventional emulsions. They are a part of the nano-emulsion family albeit with substantial difference in composition and application. AREAS COVERED The present review provides a brief insight into the strategies of loading water-sensitive drugs into NANEs. Further advancement in these anhydrous systems with the use of solid particulate surfactants in the form of Pickering emulsions is also discussed. EXPERT OPINION NANEs offer a unique platform for delivering water-sensitive drugs by loading them in anhydrous formulation. The biggest advantage of NANEs vis-à-vis the other nano-cargos is that they can also be prepared without using equipment-intensive techniques. However, the use of NANEs in drug delivery is quite limited. Looking at the small number of studies available in this direction, a need for further research in this field is required to explore this delivery system further.
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Affiliation(s)
| | - Sachin Kumar Singh
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, India
| | - Sheetu Wadhwa
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, India
| | - Monica Gulati
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, India
| | - Bhupinder Kapoor
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, India
| | - Rubiya Khursheed
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, India
| | - Gowthamarajan Kuppusamy
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty, Nilgiris, India.,Centre of Excellence in Nanoscience & Technology, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty, Nilgiris, India
| | - Kamal Dua
- Discipline of Pharmacy, Graduate School of Health, University of Technology Sydney, Australia.,Faculty of Health, Australian Research Centre in Complementary and Integrative Medicine, University of Technology Sydney, Ultimo, Australia
| | - Harish Dureja
- Department of Pharmaceutical Sciences, Maharshi Dayanand University, Rohtak, India
| | - Dinesh Kumar Chellappan
- Department of Life Sciences, School of Pharmacy, International Medical University, Kuala Lumpur, Malaysia
| | - Niraj Kumar Jha
- Department of Biotechnology, School of Engineering & Technology (Set), Sharda University, Greater Noida, India
| | - Piyush Kumar Gupta
- Department of Life Sciences, School of Basic Sciences and Research, Sharda University, Greater Noida, India
| | - Sukriti Vishwas
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, India
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5
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Zhang J, Zhou D, Zhang L, Lin Q, Ren W, Zhang J, Nadeem L, Xu G. Dual Effects of N,N-dimethylformamide on Cell Proliferation and Apoptosis in Breast Cancer. Dose Response 2017; 15:1559325817744450. [PMID: 29238273 PMCID: PMC5721971 DOI: 10.1177/1559325817744450] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 10/25/2017] [Accepted: 10/31/2017] [Indexed: 12/15/2022] Open
Abstract
N,N-dimethylformamide (DMF) has been widely used as an organic solvent in industries. DMF is a potential medication. However, the antitumorigenic role of DMF in breast cancer remains unclear. Here, we examined dose-dependent effects of DMF on proliferation and apoptosis in breast cancer MCF-7 and nontumorous MCF-12A cells. We found that DMF had a growth inhibitory effect in MCF-12A cells in a dose-dependent manner. By contrast, however, DMF had dual effects on cell proliferation and apoptosis in MCF-7 cells. DMF at a high dose (100 mM) significantly inhibited MCF-7 cell growth while at a low dose (1 mM) significantly stimulated MCF-7 cell growth (both P < .05). The inhibitory effect of DMF on cell proliferation was accompanied by the decrease of cyclin D1 and cyclin E1 protein expression, leading to the cell cycle arrest at the G0/G1 phase. Furthermore, a high-dose DMF significantly increased the number of early apoptotic cells by increasing cleaved caspase-9 and proapoptotic protein Bax expression and decreased the ratio of Bcl-xL/Bax (P < .01). Thus, our data demonstrated for the first time that DMF has dual effects on breast cancer cell behaviors depending upon its dose. Caution must be warranted in determining its effective dose for targeting breast cancer.
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Affiliation(s)
- Jihong Zhang
- Center Laboratory, Jinshan Hospital, Fudan University, Shanghai, People's Republic of China
| | - Daibing Zhou
- Center Laboratory, Jinshan Hospital, Fudan University, Shanghai, People's Republic of China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, People's Republic of China
| | - Lingyun Zhang
- Center Laboratory, Jinshan Hospital, Fudan University, Shanghai, People's Republic of China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, People's Republic of China
| | - Qunbo Lin
- Center Laboratory, Jinshan Hospital, Fudan University, Shanghai, People's Republic of China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, People's Republic of China
| | - Weimin Ren
- Center Laboratory, Jinshan Hospital, Fudan University, Shanghai, People's Republic of China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, People's Republic of China
| | - Jinguo Zhang
- Center Laboratory, Jinshan Hospital, Fudan University, Shanghai, People's Republic of China
| | - Lubna Nadeem
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Guoxiong Xu
- Center Laboratory, Jinshan Hospital, Fudan University, Shanghai, People's Republic of China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, People's Republic of China.,Medical Research Center for Chemical Injury, Emergency and Critical Care of Fudan University, Shanghai, People's Republic of China
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7
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Medina-Herrera N, Grossmann IE, Mannan MS, Jiménez-Gutiérrez A. An Approach for Solvent Selection in Extractive Distillation Systems Including Safety Considerations. Ind Eng Chem Res 2014. [DOI: 10.1021/ie501205j] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nancy Medina-Herrera
- Chemical
Engineering Department, Instituto Tecnológico de Celaya, Celaya, GTO 38060 México
| | - Ignacio E. Grossmann
- Chemical
Engineering Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - M. Sam Mannan
- Department of Chemical Engineering and The Mary Kay O’Connor Process Safety Center, Texas A&M University, College Station, Texas 77843 United States
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8
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Cole P, Mandel JS, Collins JJ. Acrylonitrile and cancer: a review of the epidemiology. Regul Toxicol Pharmacol 2008; 52:342-51. [PMID: 18926871 DOI: 10.1016/j.yrtph.2008.09.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2008] [Revised: 09/18/2008] [Accepted: 09/19/2008] [Indexed: 10/21/2022]
Abstract
Several retrospective cohort epidemiology studies evaluated a number of health outcomes in workers exposed to acrylonitrile (AN). The epidemiology studies included in this review have been published since 1970 and were identified through Ovid and MEDLINE retrieval services using search words "acrylonitrile and cancer". We identified 26 studies which examined mortality and/or incidence rates among persons with AN exposure. Where cohorts have been updated the most recent data were relied upon but descriptions of the earlier publications are provided for background and rationale. Results are provided for all causes of death and all cancers. Detailed results and discussions are provided for the cancers which have received the most attention and for which some positive results have been reported. These include lung, bladder, prostate, and central nervous system cancers. In this review the four most informative cohort studies are evaluated and it is apparent that the results do not support a causal relationship between AN and all cancers or any specific type of cancer. IARC actually downgraded acrylonitrile from "probably carcinogenic" to "possibly carcinogenic to humans" finding that "the earlier indications of an increased risk among workers exposed to acrylonitrile were not confirmed by the recent, more informative studies". This was one of few downgrades of classification by IARC. Our review of the epidemiology data is consistent with the conclusions of the earlier IARC review which found no consistent findings of increased cancer risk across studies.
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Affiliation(s)
- Philip Cole
- Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, USA
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9
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Mortality Among Workers Exposed to Acrylonitrile in Fiber Production: An Update. J Occup Environ Med 2008; 50:550-60. [DOI: 10.1097/jom.0b013e318162f640] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Sponsiello-Wang Z, Sanders E, Weitkunat R. Occupational acrylonitrile exposure and lung cancer: a meta-analysis. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART C, ENVIRONMENTAL CARCINOGENESIS & ECOTOXICOLOGY REVIEWS 2006; 24:257-84. [PMID: 17114112 DOI: 10.1080/10590500601006715] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The present work summarizes the currently available published studies on lung cancer and occupational acrylonitrile exposure. Meta-analytic methods were used to estimate the overall risk. To adjust for the healthy worker effect, rate ratio estimates based on regression analyses and ratios of standard mortality ratios were aggregated. Overall effect estimates were 0.95 (95% CI 0.86 to 1.06) and 1.25 (95% CI 1.10 to 1.43) before and after adjustment for the healthy worker effect, respectively. Therefore, a 25% increase in lung cancer risk attributable to occupational acrylonitrile exposure is suggested. Possible contribution of smoking confounding the increased risk cannot be fully excluded.
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Affiliation(s)
- Zheng Sponsiello-Wang
- Philip Morris Products SA, Research and Development, Product Risk Management, Quai Jeanrenaud 56, Neuchâtel, Switzerland.
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11
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Senoh H, Aiso S, Arito H, Nishizawa T, Nagano K, Yamamoto S, Matsushima T. Carcinogenicity and Chronic Toxicity after Inhalation Exposure of Rats and Mice to
N,N
‐Dimethylformamide. J Occup Health 2004; 46:429-39. [PMID: 15613765 DOI: 10.1539/joh.46.429] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Carcinogenicity and chronic toxicity of N,N-Dimethylformamide (DMF) were examined by inhalation exposure of groups of 50 rats and 50 mice of both sexes to DMF vapor at a concentration of 0, 200, 400 or 800 ppm (v/v) for 6 h/d, 5 d/wk, for 104 wk. In rats, incidences of hepatocellular adenomas and carcinomas significantly increased in the 400 and 800 ppm-exposed groups and in the 800 ppm-exposed group, respectively. The hepatocellular adenoma did not increase significantly in the 400 ppm-exposed female rats, but its incidence exceeded a range of historical control data in the Japan Bioassay Research Center (JBRC). In mice, incidences of hepatocellular adenomas and carcinomas significantly increased in all the DMF-exposed groups. Incidence of hepatoblastomas significantly increased in the 200 and 400 ppm-exposed male mice, and 4 cases of hepatoblastomas in the 400 ppm-exposed female mice and the 800 ppm-exposed male mice exceeded the range of historical control data of the JBRC. Incidences of altered cell foci increased in the liver of exposed rats and mice in an exposure concentration-related manner, and those foci were causally related to the hepatocellular tumors. Liver weights increased in both rats and mice exposed to DMF at 200 ppm and above. Increased levels of gamma-GTP, ALT, AST and total bilirubin in exposed rats of both sexes and AST and ALT in exposed mice of both sexes were noted. It was concluded that 2-yr inhalation exposure to DMF increased incidences of hepatocellular adenomas and carcinomas in rats and incidences of hepatocellular adenomas, carcinomas and hepatoblastomas in mice, and that hepatocarcinogenicity of DMF was more potent in mice than in rats.
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12
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Zhang H, Kamendulis LM, Jiang J, Xu Y, Klaunig JE. Acrylonitrile-induced morphological transformation in Syrian hamster embryo cells. Carcinogenesis 2000; 21:727-33. [PMID: 10753209 DOI: 10.1093/carcin/21.4.727] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Acrylonitrile (ACN) is a monomer used in the synthesis of rubber, fibers and plastics. Previous studies demonstrated that ACN induces brain neoplasms (predominately astrocytomas) in rats following chronic treatment. While the mechanisms of ACN-induced glial cell carcinogenicity have not been completely elucidated, investigations by our group and others have suggested a role for the induction of oxidative stress and the resultant oxidative damage in this process. In vitro cell transformation models are useful for detecting and studying the mechanisms of chemical carcinogenesis. Cell transformation by chemical carcinogens in Syrian hamster embryo (SHE) cells exhibits a multistage process similar to that observed in vivo, for both non-genotoxic and genotoxic carcinogens. In the present study, the ability of ACN to induce morphological transformation and oxidative damage was examined in SHE cells. ACN induced an increase in morphological transformation at doses of 50, 62.5 and 75 microg/ml (maximum sub-toxic dose tested) following 7 days of continuous treatment. SHE cells exposed to ACN for 24 h failed to increase morphological transformation. Morphological transformation by ACN was inhibited by co-treatment with the antioxidants alpha-tocopherol and (-)-epigallocathechin-3 gallate (EGCG) for 7 days. Treatment of SHE cells with 75 microg/ml ACN produced a significant increase in 8-hydroxy-2'-deoxyguanosine that was also inhibited by co-treatment with alpha-tocopherol or EGCG. These results support the proposal that oxidative stress and the resulting oxidative damage is involved in ACN-induced carcinogenicity.
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Affiliation(s)
- H Zhang
- Division of Toxicology, Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
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13
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Abstract
OBJECTIVES To examine the association between exposure to acrylonitrile (AN) and cancer mortality by performing an independent and extended historical cohort study of workers from a chemical plant in Lima, Ohio included in a recent NCI-NIOSH study. METHODS Subjects were 992 white males who were employed for three or more months between 1960 and 1996. We identified 110 deaths and cause of death for 108. Worker exposures were estimated quantitatively for AN and qualitatively for nitrogen products. Statistical analyses included U.S. and local county-based SMRs and internal relative risk regression of internal cohort rates. RESULTS No statistically significant excess mortality risks were observed among the total cohort for the cancer sites implicated in previous studies: stomach, lung, breast, prostate, brain, and hematopoietic system. We observed a statistically significant bladder cancer excess based on four deaths (SMR=7.01, 95% CI=1.91-17.96) among workers not exposed to AN. Among 518 AN-exposed workers, we observed a not statistically significant excess of lung cancer based on external (SMR=1.32, 95% CI=.60-2.51) and internal (RR=1.98, 95% CI=.60-6.90) comparisons. Although the trends were not statistically significant, exposure-response analyses of internal cohort rates showed monotonically increasing lung cancer rate ratios with increasing AN exposure, with RRs exceeding 2.0 in the highest exposure categories. CONCLUSIONS With the possible exception of lung cancer, this study provides little evidence that exposure to AN at levels experienced by Lima plant workers is associated with an increased risk of death from any cause including the implicated cancer sites.
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Affiliation(s)
- G M Marsh
- Department of Biostatistics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA 15621, USA. gmarsh+@pitt.edu
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14
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Mostafa AM, Abdel-Naim AB, Abo-Salem O, Abdel-Aziz AH, Hamada FM. Renal metabolism of acrylonitrile to cyanide: in vitro studies. Pharmacol Res 1999; 40:195-200. [PMID: 10433881 DOI: 10.1006/phrs.1999.0502] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Acrylonitrile (VCN) is a widely used industrial chemical. The present work examines the mechanism of its renal toxicity. In renal centrifugal fractions from Sprague-Dawley rats, the metabolism of VCN to cyanide (CN(-)) was highest in the microsomal fraction and required a NADPH-generating system in the presence of magnesium ions for maximum activity. This biotransformation of VCN to CN(-)was characterised with respect to time (15 min), microsomal protein concentration (3 mg ml(-1)), pH (7.5) and temperature (37 degrees C). The V(max)of the reaction was 118.2 pmol CN(-)mg(-1)protein min(-1)and K(m)was 160.2 micromol VCN. Activation of VCN to CN(-)was markedly increased in microsomes obtained from phenobarbital (PB), ethanol, 4-methylpyrazole and 3-methylcholanthrene-treated rats by 161.5, 89.6, 71.0 and 50.2%, respectively. Addition of SKF 525-A (5x10(-4)m) or benzimidazole (2 m m) to the incubation mixtures significantly inhibited VCN metabolism by 66.6 and 78.8%, respectively. VCN metabolism to CN(-)was enhanced significantly by the addition of 10 m m of glutathione (GSH), l -cysteine, d -penicillamine, cysteamine or 2-mercaptoethanol to 389.5, 886.5, 611. 1, 145.5 and 384.0% of control, respectively. These findings indicate that VCN is metabolised in the kidney via cytochrome P-450-dependent mixed function oxidase system. 1999 Academic Press.
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Affiliation(s)
- A M Mostafa
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Al-Azhar University, Nasr City, Cairo, Egypt
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15
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Léonard A, Gerber GB, Stecca C, Rueff J, Borba H, Farmer PB, Sram RJ, Czeizel AE, Kalina I. Mutagenicity, carcinogenicity, and teratogenicity of acrylonitrile. Mutat Res 1999; 436:263-83. [PMID: 10354525 DOI: 10.1016/s1383-5742(99)00006-x] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Acrylonitrile (AN) is an important intermediary for the synthesis of a variety of organic products, such as artificial fibres, household articles and resins. Although acute effects are the primary concern for an exposure to AN, potential genotoxic, carcinogenic and teratogenic risks of AN have to be taken seriously in view of the large number of workers employed in such industries and the world-wide population using products containing and possibly liberating AN. An understanding of the effect of acrylonitrile must be based on a characterization of its metabolism as well as of the resulting products and their genotoxic properties. Tests for mutagenicity in bacteria have in general been positive, those in plants and on unscheduled DNA synthesis doubtful, and those on chromosome aberrations in vivo negative. Wherever positive results had been obtained, metabolic activation of AN appeared to be a prerequisite. The extent to which such mutagenic effects are significant in man depends, however, also on the conditions of exposure. It appears from the limited data that the ultimate mutagenic factor(s), such as 2-cyanoethylene oxide, may have little opportunity to act under conditions where people are exposed because it is formed only in small amounts and is rapidly degraded. The carcinogenic action of AN has been evaluated by various agencies and ranged from 'reasonably be anticipated to be a human carcinogen' to 'cannot be excluded', the most recent evaluation being 'possibly carcinogenic to humans'. Animal data that confirm the carcinogenic potential of AN have certain limitations with respect to the choice of species, type of tumors and length of follow up. Epidemiological studies which sometimes, but not always, yielded positive results, encounter the usual difficulties of confounding factors in chemical industries. Exposure of workers to AN should continue to be carefully monitored, but AN would not have to be considered a cancer risk to the population provided limitations on releases from consumer products and guidelines on AN in water and air are enforced. AN is teratogenic in laboratory animals (rat, hamster) at high doses when foetal/embryonic (and maternal) toxicity already is manifest. Pregnant workers should not be exposed to AN. In view of the small concentrations generally encountered outside plants, women not professionally exposed would appear not to be at risk of teratogenic effects due to AN. Future research should concentrate on the elucidation of the different degradation pathways in man and on epidemiological studies in workers including pregnant women, assessing also, if possible, individual exposure by bio-monitoring.
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Affiliation(s)
- A Léonard
- Teratogenicity and Mutagenicity Unit, Catholic University of Louvain, Avenue E. Mounier 72, UCL 7237, B-1200, Brussels, Belgium.
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Whysner J, Ross PM, Conaway CC, Verna LK, Williams GM. Evaluation of possible genotoxic mechanisms for acrylonitrile tumorigenicity. Regul Toxicol Pharmacol 1998; 27:217-39. [PMID: 9693074 DOI: 10.1006/rtph.1998.1204] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Acrylonitrile (ACN) exposure is associated with tumors in rat brain, Zymbal gland, and mammary gland. Adducts affecting base pairing were formed in isolated DNA exposed in vitro to the ACN metabolite cyanoethylene oxide (CNEO). DNA from liver, which is not a cancer target organ in ACN-exposed rats, contained low levels of 7-(2-oxoethyl)guanine, and adduct believed not to interfere with base pairing. No adducts have been detected in brain DNA from ACN-exposed rats, suggesting that brain tumors may have arisen by mechanisms other than ACN-DNA reactivity. Genotoxicity assays of ACN have indicated no particular carcinogenic mechanism. Positive reverse mutagenesis in Salmonella typhimurium HisG46 base substitution tester strains by ACN is attributable to CNEO. Other in vitro genotoxicity test assays of ACN have yielded mixed results, without consistent effect of metabolic activation. Some positive genotoxicity data for ACN appear to result from artifacts or from non-DNA-reactive mechanisms. In vivo micronucleus, chromosome aberration, and autoradiographic unscheduled DNA synthesis assays were negative for ACN. The comparative genotoxicity of vinyl chloride and ACN indicates that despite other similarities, they cause rodent tumors by different mechanisms. Also, they absence of ACN-DNA adduct formation in the rat brain suggests the operation of epigenetic mechanisms.
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Affiliation(s)
- J Whysner
- Toxicology and Risk Assessment Program, American Health Foundation, Valhalla, New York 10595, USA
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Abstract
The present work examines the mechanism of testicular toxicity of acrylonitrile. In testicular centrifugal fractions from Sprague Dawley rats, the metabolism of VCN to cyanide (CN-) was highest in the microsomal fraction and required NADPH for maximum activity. This biotransformation of VCN to CN- was characterized with respect to time (30 min), microsomal protein concentration (1.5 mg ml(-1)), pH (7.5) and temperature (37 degrees C). The V(max) of the reaction was 65.1 pmol CN- mg protein(-1) min(-1) and K(m) was 88.6 micromol VCN. Flushing the microsomes with carbon monoxide (CO)(4:1, CO/O2 v/v), addition of benzimidazole (1 mM) or addition of SKF 525-A (5x10(-4) M) to incubation mixtures significantly inhibited VCN metabolism by 49%, 54% and 37.4% respectively. Activation of VCN to CN- was markedly increased in microsomes obtained from phenobarbital (PB)-treated rats (128.2%). Addition of glutathione (GSH), L-cysteine, D-penicillamine or 2-mercaptoethanol significantly enhanced the release of CN- from VCN 126%, 247%, 202% and 129% of the control value respectively. These findings indicate that VCN is metabolized in the testis via cytochrome P-450 dependent mixed function oxidase system.
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Affiliation(s)
- A H Abdel-Aziz
- Department of Pharmacology & Toxicology, Faculty of Pharmacy, Al-Azhar University, Nasr City, Cairo, Egypt
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18
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Rockley PF, Trieff N, Wagner RF, Tyring SK. Nonsunlight risk factors for malignant melanoma. Part I: Chemical agents, physical conditions, and occupation. Int J Dermatol 1994; 33:398-406. [PMID: 8056470 DOI: 10.1111/j.1365-4362.1994.tb04038.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- P F Rockley
- Departments of Dermatology, University of Texas Medical Branch, Galveston 77555-0783
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Nelemans PJ, Scholte R, Groenendal H, Kiemeney LA, Rampen FH, Ruiter DJ, Verbeek AL. Melanoma and occupation: results of a case-control study in The Netherlands. BRITISH JOURNAL OF INDUSTRIAL MEDICINE 1993; 50:642-646. [PMID: 8343426 PMCID: PMC1035501 DOI: 10.1136/oem.50.7.642] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Several studies have reported excesses of risk of melanoma in specific industries. Data from a case-control study in The Netherlands, including 140 cases with a cutaneous melanoma and 181 controls with other types of malignancy, were used to evaluate whether the reported associations with these specific industries could be reproduced. Adjustment for characteristics of pigmentation and exposure to sunlight was made. Increased risks of cutaneous melanoma were found for subjects who had ever worked in the electronics industry (odds ratio (OR) = 2.03, 95% confidence interval (95% CI) 0.63-6.62), in the metal industry (OR = 2.61, 95% CI 0.96-7.10), and in the transport and communication branch (OR = 1.92, 95% CI 0.84-4.35). These ORs were adjusted for age, sex, education, hair colour, tendency to burn, freckling, and exposure to sunlight. No increased risks were seen for workers in the chemical industry, the textile industry, and among health care workers. Analyses according to duration and latency of exposure did not give consistent results, but existing patterns may be obscured by the imprecision of the estimates.
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Affiliation(s)
- P J Nelemans
- Department of Medical Informatics and Epidemiology, University of Nijmegen, The Netherlands
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20
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Hundley SG, Lieder PH, Valentine R, Malley LA, Kennedy GL. Dimethylformamide pharmacokinetics following inhalation exposures to rats and mice. Drug Chem Toxicol 1993; 16:21-52 sW. [PMID: 8436076 DOI: 10.3109/01480549309038660] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Whole-body inhalation exposures to N,N-dimethylformamide (DMF) were conducted with rats and mice. The exposure concentrations were 10, 250, and 500 ppm DMF. The exposure routines consisted of single 1-, 3-, or 6-hour exposures and ten 6-hour exposures (ten exposure days in 2 weeks). Area under the plasma concentration curve (AUC) values were determined following exposure for DMF and "N-methylformamide" ["NMF" represented N-methylformamide plus N-(hydroxymethyl)-N-methylformamide (DMF-OH)]. The DMF AUC values increased 8- and 29-fold for rats and mice, respectively, following single six-hour exposures to 250 and 500 ppm DMF. These data are indicative of saturation of DMF metabolism. Peak "NMF" plasma concentrations for rats and mice, following single 6-hour exposures, did not increase as DMF exposure concentrations increased from 250 to 500 ppm. In addition, the "NMF" plasma levels in rats following a single 6-hour 500 ppm DMF exposure did not decay by 24 hours post exposure. These "NMF" plasma data also indicate saturation of DMF metabolism. Multiple exposures to 500 ppm DMF resulted in a 3- and 4-fold reduction in DMF AUC values for rats and mice, respectively, compared to AUC values following a single six-hour 500 ppm DMF exposure. This indicates enhanced metabolism of DMF resulting from multiple 500 ppm DMF exposures and together with saturation of DMF metabolism suggest using exposure levels below 500 ppm in a chronic bioassay. Selected plasma samples were simultaneously assayed for NMF and DMF-OH. The "NMF" values consisted of between 30 to 60 percent DMF-OH depending upon the exposure group (conversely NMF represented 30 to 60 percent of the "NMF" levels). Urinary analysis of all samples revealed DMF-OH represented over 90 percent of the summed DMF, DMF-OH and NMF quantities.
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Affiliation(s)
- S G Hundley
- E. I. du Pont de Nemours & Company, Inc., Haskell Laboratory for Toxicology and Industrial Medicine, Newark, Delaware 19714
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21
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Affiliation(s)
- P J Nelemans
- Department of Epidemiology, University of Nijmegen, The Netherlands
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Seiji K, Inoue O, Cai SX, Kawai T, Watanabe T, Ikeda M. Increase in sister chromatid exchange rates in association with occupational exposure to N,N-dimethylformamide. Int Arch Occup Environ Health 1992; 64:65-7. [PMID: 1399017 DOI: 10.1007/bf00625953] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The effects of occupational exposure to N,N-dimethylformamide (DMF) on sister chromatid exchange (SCE) rates were studied in peripheral lymphocytes from 22 DMF-exposed women (aged 22-52 years) in comparison with 22 sex-, age-, and residence-matched controls. All subjects were nonsmokers and nondrinkers as confirmed by medical interview. The 22 pairs were divided by the intensity of exposure to DMF into 3 subgroups of high-exposed (8 pairs with mean DMF exposure at 5.8 ppm), middle-exposed (5 pairs with DMF at 0.7 ppm in combination with toluene at 0.9 ppm), and low-exposed (9 pairs with DMF at 0.3 ppm). The SCE rates were significantly higher in the high (P less than 0.005) and middle (P less than 0.01) exposed than in their matched pairs, and the increase was related to the intensity of DMF exposure.
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Affiliation(s)
- K Seiji
- Tohoku Rosai Hospital, Sendai, Japan
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23
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Cai SX, Huang MY, Xi LQ, Li YL, Qu JB, Kawai T, Yasugi T, Mizunuma K, Watanabe T, Ikeda M. Occupational dimethylformamide exposure. 3. Health effects of dimethylformamide after occupational exposure at low concentrations. Int Arch Occup Environ Health 1992; 63:461-8. [PMID: 1577525 DOI: 10.1007/bf00572112] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A factory survey was conducted in a plant where N,N-dimethylformamide (DMF) was in use during the production of polyurethane plastics and related materials. In all, 318 DMF-exposed workers (195 men and 123 women) and 143 non-exposed controls (67 men and 76 women) were examined for time-weighted average exposure (to DMF and other solvents by diffusive sampling), hematology, serum biochemistry, subjective symptoms, and clinical signs. Most of the exposed workers were exposed only to DMF, whereas others were exposed to a combination of DMF and toluene. DMF exposure in the former group was up to 7.0 ppm (geometric mean on a workshop basis), whereas it was up to 2.1 ppm in combination with 4.2 ppm toluene. Both hematology and serum biochemistry, results (including aspartate and alanine aminotransferases, gamma-glutamyl transpeptidase and amylase) were essentially comparable among the 3 groups. There was, however, a dose-dependent increase in subjective symptoms, especially during work, and in digestive system-related symptoms such as nausea and abdominal pain in the past 3-month period. The prevalence rate of alcohol intolerance complaints among male (assumedly) social drinkers was also elevated in relation to DMF dose.
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Affiliation(s)
- S X Cai
- Institute of Occupational Medicine, Chinese Academy of Preventive Medicine, Beijing
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Hurtt ME, McCooey KT, Placke ME, Kennedy GL. Ten-day repeated-exposure inhalation study of dimethylformamide (DMF) in cynomolgus monkeys. Toxicol Lett 1991; 59:229-37. [PMID: 1755030 DOI: 10.1016/0378-4274(91)90076-i] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Cynomolgus monkeys showed no measurable adverse effects following inhalation of 500 ppm dimethylformamide (DMF), 6 h/d, 5 d/wk, for 2 weeks either when exposed whole-body or head-only (one monkey per exposure route). Measurement of DMF concentrations into and out of the head-only exposure unit along with measurement of the tidal volume suggest that DMF absorption by the respiratory tract is approximately 100% at a concentration of 500 ppm. Plasma samples taken 1/2 to 18 h after the first exposure show DMF AUC values which were 3 times higher in the monkey exposed by whole-body, indicating considerable absorption by non-inhalation route(s). The same comparison of plasma samples taken following the final (10th) exposure similarly had a 6-times DMF AUC value for the monkey exposed by whole-body. From this study it is apparent that the practice of avoiding dermal contact with DMF is important in reducing the likelihood of producing DMF-induced injury in the workplace.
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Affiliation(s)
- M E Hurtt
- Du Pont, Haskell Laboratory for Toxicology and Industrial Medicine, Newark, DE 19714
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Mráz J, Cross H, Gescher A, Threadgill MD, Flek J. Differences between rodents and humans in the metabolic toxification of N,N-dimethylformamide. Toxicol Appl Pharmacol 1989; 98:507-16. [PMID: 2718177 DOI: 10.1016/0041-008x(89)90179-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The widely used industrial solvent N,N-dimethylformamide (DMF) causes liver damage in occupationally exposed persons and is suspected of involvement in the generation of certain occupational malignancies. Here the extent of the biotransformation of DMF to three urinary metabolites has been compared in humans and rodents. The metabolites, which were quantified by gas chromatography (GC) are N-(hydroxymethyl)-N-methylformamide (HMMF), which yielded N-methylformamide on GC analysis, a species which decomposed to formamide on GC analysis, and N-acetyl-S-(N-methylcarbamoyl) cysteine (AMCC), measured after derivatization with ethanol to give ethyl N-methylcarbamate. Ten volunteers who absorbed between 28 and 60 mumol/kg DMF during an 8-hr exposure to DMF in the air at 60 mg/m3 excreted in the urine within 72 hr between 16.1 and 48.7% of the dose as HMMF, between 8.3 and 23.9% as formamide, and between 9.7 and 22.8% as AMCC. AMCC, together with HMMF, was also detected in the urine of workers after occupational exposure to DMF. The portion of the dose (0.1, 0.7, or 7.0 mmol/kg given ip) which was metabolized in mice, rats, or hamsters to HMMF varied between 8.4 and 47.3% of the dose; between 7.9 and 37.5% were excreted as formamide and only between 1.1 and 5.2%, as AMCC. The results suggest that there is a quantitative difference between the metabolic pathway of DMF to AMCC in humans and rodents. It is argued that the hepatotoxic potential of DMF may be linked to the extent of its metabolic conversion to AMCC.
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Affiliation(s)
- J Mráz
- Pharmaceutical Sciences Institute, Aston University, Birmingham, England
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