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Maquilón C, Brandolese A, Alter C, Hövelmann CH, Della Monica F, Kleij AW. Renewable Beta-Elemene Based Cyclic Carbonates for the Preparation of Oligo(hydroxyurethane)s. CHEMSUSCHEM 2022; 15:e202201123. [PMID: 35757910 PMCID: PMC9541927 DOI: 10.1002/cssc.202201123] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 06/25/2022] [Indexed: 06/14/2023]
Abstract
Conversion of β-elemene into new β-elemene dicarbonates through epoxidation and halide salt-catalyzed CO2 cycloaddition reactions is reported. Step-growth polyaddition of this dicarbonate to five different, commercial diamines was investigated under neat conditions at 150 °C yielding non-isocyanate-based low molecular weight oligo(hydroxyurethane)s with 1.3≤Mn ≤6.3 kDa and 1.3≤Ð≤2.1, and with glass transition temperatures ranging from -59 to 84 °C. The preparation of one selected polyhydroxyurethane material, obtained in the presence of Jeffamine® D-2010 was scaled-up to 43 g. The latter, when combined in a formulation using Irgacure® 2100 and Laromer® LR 9000 allowed the preparation of coatings that were analyzed with several techniques showing the potential of these biobased oligourethanes towards the preparation of commercially relevant materials.
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Affiliation(s)
- Cristina Maquilón
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
| | - Arianna Brandolese
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
| | | | | | - Francesco Della Monica
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
- Current affiliation: Dipartimento di Biotecnologie e Scienze della VitaUniversità degli Studi dell'InsubriaVia J. H. Dunant 321100VareseItaly
| | - Arjan W. Kleij
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology (BIST)Av. Països Catalans 1643007TarragonaSpain
- Catalan Institute of Research and Advanced Studies (ICREA)Pg. Lluis Companys 2308010BarcelonaSpain
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2
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Vignesh V, Nguyen THH, Vanderwal L, Stafslien S, Brennan A. Tough amphiphilic antifouling coating based on acrylamide, fluoromethacrylate and non-isocyanate urethane dimethacrylate crosslinker. BIOFOULING 2021; 37:36-48. [PMID: 33487051 DOI: 10.1080/08927014.2020.1870110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 12/21/2020] [Indexed: 06/12/2023]
Abstract
This study is focused on the development of tougher gels using combinations of acrylamide, fluoromethacrylate and a non-isocyanate urethane dimethacrylate (NIUDMA) crosslinker. The NIUDMA was tailored with 2, 3-epoxypropoxy propyl-polydimethylsiloxane segments E9 (MW = 0.36 kg mol-1), E11 (MW = 0.5-0.6 kg mol-1) and E12 (MW = 1-1.4 kg mol-1). A 3 level Taguchi design was used to evaluate the role of each component of the ternary copolymer gel on the elastic modulus and toughness. The toughness ranged from 2.5-7 MJ m-3 whereas the modulus ranged from 27-70 MPa. The formulations with the highest toughness and modulus were screened for their antifouling potential in biological assays against the microalga Navicula incerta and the bacterium Cellulophaga lytica. The E9 gels showed the best performance, achieving a 73% reduction in N. incerta cells and a 92% reduction in C. lytica biofilm remaining after water jetting treatments, when compared with the commercial Intersleek product IS700.
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Affiliation(s)
- Vishal Vignesh
- Department of Materials Science and Engineering, University of Florida, Gainesville, USA
| | - Thi Hoang Ha Nguyen
- Department of Materials Science and Engineering, University of Florida, Gainesville, USA
| | - Lyndsi Vanderwal
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, USA
| | - Shane Stafslien
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, USA
| | - Anthony Brennan
- Department of Materials Science and Engineering, University of Florida, Gainesville, USA
- Margaret A. Ross Professor of Materials Science & Engineering, Affiliate of Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA
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3
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Heinrich P, Hanslik L, Kämmer N, Braunbeck T. The tox is in the detail: technical fundamentals for designing, performing, and interpreting experiments on toxicity of microplastics and associated substances. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:22292-22318. [PMID: 32335837 DOI: 10.1007/s11356-020-08859-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 04/13/2020] [Indexed: 06/11/2023]
Abstract
Over the last 10 years, there has been a plethora of experimental studies estimating the potential of microplastic particles (MPs) to exert toxic effects in the environment, many specifically focusing on their postulated capacity to enhance the transfer of environmental pollutants into organisms after ingestion. Obviously, there is little to no consensus on appropriate experimental design, which is mainly owing to the novelty, the interdisciplinarity of the subject, and the complexity of parameters involved. This results in fundamental discrepancies regarding the materials applied, the approach for spiking MPs with pollutants, and the exact exposure scenario. Aiming for a non-chemist audience and providing illustrative, representative, and comparative examples, this review first outlines the theoretical essentials of processes involved in sorption. Also, it discusses the implications for designing experimental approaches using MPs and interpreting the results obtained under consideration of their relevance for environmental conditions. It may help to improve the interpretation of studies on MP toxicity already published, while also calling experimenters' attention to various aspects important to consider when designing and performing environmentally relevant experiments with MPs.
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Affiliation(s)
- Patrick Heinrich
- Aquatic Ecology and Toxicology Section, Centre for Organismal Studies, University of Heidelberg, Im Neuenheimer Feld 504, 69120, Heidelberg, Germany.
| | - Lisa Hanslik
- Aquatic Ecology and Toxicology Section, Centre for Organismal Studies, University of Heidelberg, Im Neuenheimer Feld 504, 69120, Heidelberg, Germany
| | - Nadine Kämmer
- Aquatic Ecology and Toxicology Section, Centre for Organismal Studies, University of Heidelberg, Im Neuenheimer Feld 504, 69120, Heidelberg, Germany
| | - Thomas Braunbeck
- Aquatic Ecology and Toxicology Section, Centre for Organismal Studies, University of Heidelberg, Im Neuenheimer Feld 504, 69120, Heidelberg, Germany
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4
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Kreis K, Aumann-Suslin I, Lüdeke A, Wegewitz U, Zeidler J, Graf von der Schulenburg JM. Costs of isocyanate-related occupational diseases: A systematic review. JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HYGIENE 2019; 16:446-466. [PMID: 31100044 DOI: 10.1080/15459624.2019.1609005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Although isocyanates are increasingly used in manufacturing and workplace exposure to isocyanates is widely recognized as one of the most frequent causes for occupational lung and skin diseases, little is known about the economic burden on the affected individual and the society. This study provides an overview on costs of occupational diseases related to isocyanates. We performed a systematic literature search of studies in the electronic databases of the German Institute of Medical Documentation and Information, and the Canadian Centre for Occupational Health and Safety. We extracted the key characteristics of the studies and performed a study quality assessment. We identified eight studies on the costs of illness, of which five focused on occupational lung diseases and three on occupational skin diseases. Further, eight studies calculated loss of income/compensation payments. Out of the 16 identified articles, only two reported costs directly attributable to isocyanate-induced diseases (asthma). Studies were hardly comparable because they differed substantially in their methodological approaches. Moreover, the quality assessment of the studies revealed substantial limitations. While a wide range of isocyanate-related costs was identified, consequences of isocyanate-related occupational diseases were considerable in terms of societal costs and loss of income. In most studies, indirect costs were the main cost driver. There is a need for high-quality cost of illness studies on isocyanate-induced diseases stratified by degree of severity and sex. Such studies provide valuable information to develop preventive strategies and set priorities for measures to lower the burden of professional health risks.
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Affiliation(s)
- Kristine Kreis
- a Center for Health Economics Research Hannover (CHERH) , Leibniz University Hannover , Hannover , Germany
| | - Ines Aumann-Suslin
- a Center for Health Economics Research Hannover (CHERH) , Leibniz University Hannover , Hannover , Germany
| | - Andreas Lüdeke
- b Federal Institute for Occupational Safety and Health (BAuA) , Dortmund , Germany
| | - Uta Wegewitz
- c Federal Institute for Occupational Safety and Health (BAuA) , Berlin , Germany
| | - Jan Zeidler
- a Center for Health Economics Research Hannover (CHERH) , Leibniz University Hannover , Hannover , Germany
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5
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Yeoh FH, Lee CS, Kang YB, Wong SF, Cheng SF. One-pot synthesis of palm oil-based polyester polyol for production of biodegradable and biocompatible polyurethane. J Appl Polym Sci 2018. [DOI: 10.1002/app.46861] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- F. H. Yeoh
- Department of Pharmaceutical Chemistry, School of Pharmacy; International Medical University; 126, Jalan Jalil Perkasa 19, Bukit Jalil 57000 Kuala Lumpur Malaysia
| | - C. S. Lee
- Department of Pharmaceutical Chemistry, School of Pharmacy; International Medical University; 126, Jalan Jalil Perkasa 19, Bukit Jalil 57000 Kuala Lumpur Malaysia
| | - Y. B. Kang
- Department of Pharmaceutical Chemistry, School of Pharmacy; International Medical University; 126, Jalan Jalil Perkasa 19, Bukit Jalil 57000 Kuala Lumpur Malaysia
| | - S. F. Wong
- Department of Pathology, School of Medicine; International Medical University; 126, Jalan Jalil Perkasa 19, Bukit Jalil 57000 Kuala Lumpur Malaysia
| | - S. F. Cheng
- Unit of Research on Lipids (URL), Department of Chemistry, Faculty of Science; University of Malaya, Jalan Universiti; 50603 Kuala Lumpur Malaysia
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6
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Furtwengler P, Avérous L. Renewable polyols for advanced polyurethane foams from diverse biomass resources. Polym Chem 2018. [DOI: 10.1039/c8py00827b] [Citation(s) in RCA: 102] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
This review highlights recent advances in the synthesis of renewable polyols, used for making polyurethane foams, from biomass.
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Affiliation(s)
| | - Luc Avérous
- BioTeam/ICPEES-ECPM
- UMR CNRS 7515
- Université de Strasbourg
- Cedex 2
- France
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7
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Pinkerton LE, Yiin JH, Daniels RD, Fent KW. Response to Goodman et al. Am J Ind Med 2017; 60:223-225. [PMID: 28079281 DOI: 10.1002/ajim.22681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/04/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Lynne E. Pinkerton
- Industrywide Studies Branch, Division of Surveillance, Hazard Evaluations, and Field Studies; National Institute for Occupational Safety and Health; Cincinnati Ohio
| | - James H. Yiin
- Industrywide Studies Branch, Division of Surveillance, Hazard Evaluations, and Field Studies; National Institute for Occupational Safety and Health; Cincinnati Ohio
| | - Robert D. Daniels
- Industrywide Studies Branch, Division of Surveillance, Hazard Evaluations, and Field Studies; National Institute for Occupational Safety and Health; Cincinnati Ohio
| | - Kenneth W. Fent
- Industrywide Studies Branch, Division of Surveillance, Hazard Evaluations, and Field Studies; National Institute for Occupational Safety and Health; Cincinnati Ohio
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8
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Hon CY, Peters CE, Jardine KJ, Arrandale VH. Historical occupational isocyanate exposure levels in two Canadian provinces. JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HYGIENE 2017; 14:1-8. [PMID: 27468809 DOI: 10.1080/15459624.2016.1207777] [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] [Indexed: 06/06/2023]
Abstract
Isocyanates such as toluene 2, 4-diisocyanate (TDI), methylene bisphenyl isocyanate (MDI), and hexamethylene diisocyanate (HDI) are known sensitizers and exposure to these chemicals can result in isocyanate-induced asthma-the leading cause of occupational asthma. A newly created exposure database was available containing occupational isocyanate measurements spanning 1981-1996 from Ontario and British Columbia (BC)-two of the largest provinces in Canada. The aim was to describe the historical measurements relative to exposure thresholds, ascertain differences in the data between provinces, and identify time trends. Descriptive statistics of the observations were summarized and stratified by isocyanate species and province. Chi-square tests and Student's t-test were performed to determine differences between provinces. To investigate time trends in the odds of a measurement exceeding the limit of detection (LOD) and time-weighted average (TWA), mixed effects logistic regression models were constructed. In total, 6,984 isocyanate measurements were analyzed, the majority of which were below the LOD (79%). Overall, 8.3% of samples were in excess of the 2014 TLV-TWA of 0.005 ppm. Comparing the two provinces, the proportion of samples exceeding the LOD and TLV-TWA was greater in BC for all isocyanate species. Differences in time trends were also observed between provinces-the odds of a sample exceeding the TLV-TWA decreased over time in the case of MDI (Ontario only), TDI (both Ontario and BC), and other isocyanates (BC only). Our finding that a majority of the exposure measurements was below the LOD is similar to that reported by others. Differences between provinces may be due the fact that isocyanates are classified as a designated substance in Ontario and must adhere to specific exposure control regulations. Limitations of the database, such as finite number of variables and measurements available until 1996 only, presents challenges for more in-depth analysis and generalization of results. An argument is made that a Canadian occupational exposure database be maintained to facilitate risk assessments as well as for occupational epidemiology research.
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Affiliation(s)
- Chun-Yip Hon
- a School of Occupational and Public Health , Ryerson University , Toronto , Ontario , Canada
| | - Cheryl E Peters
- b CAREX Canada , Simon Fraser University , Vancouver , British Columbia , Canada
- c Department of Health Sciences , Carleton University , Ottawa , Ontario , Canada
| | - Katherine J Jardine
- d Occupational Cancer Research Centre , Cancer Care Ontario , Toronto , Ontario , Canada
| | - Victoria H Arrandale
- d Occupational Cancer Research Centre , Cancer Care Ontario , Toronto , Ontario , Canada
- e Dalla Lana School of Public Heath , University of Toronto , Toronto , Ontario , Canada
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9
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Senthilkumar CS, Sah NK, Ganesh N. On the long-term effects of methyl isocyanate on cell-mediated immunity in Bhopal gas-exposed long-term survivors and their offspring. Toxicol Ind Health 2016; 33:318-331. [DOI: 10.1177/0748233716645480] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Methyl isocyanate (MIC) is a toxic industrial chemical that is documented as a potent respiratory toxicant. We investigated cell-mediated immunity (CMI) in the MIC-exposed long-term survivors and their offspring born after the Bhopal gas-leak tragedy in 1984. Several earlier reports show inconsistency in the assessment of immunological effects of MIC on the human population. In these studies, important factors including lifestyle attributes were overlooked. We incorporated these factors also in our study of the basic cell-mediated immune function in the Bhopal MIC-affected population. Twenty-seven years after exposure, we assessed the circulating T-lymphocyte frequency using E-Rosette assay. A total of 46 MIC-exposed healthy long-term survivors and their offspring were studied vis-a-vis parallel gender–age group-matched unexposed controls from Bhopal and various other regions of India. The influence of several lifestyle variabilities (smoking, alcohol intake, and tobacco chewing) on T-lymphocyte frequency was also taken into consideration. Our observations suggest that Erythrocyte-Rosette-forming cell (E-RFC) distribution frequency is largely insignificant in the MIC-affected population as compared to controls ( p > 0.05). In the MIC-affected tobacco chewers, there was a trend of suppression in CMI (relative decrease = 10.3%) as compared to nonchewers. Overall, our results show negligible long-term effect of MIC on CMI measured in terms of E-RFC frequency. These observations are not in agreement with earlier findings that immunosuppressive effects of MIC exposure persist in the T-cells of the affected population. However, atypical lymphocytes were frequently observed as E-RFC in the exposed females when compared to all other subgroups. Hematopoietic disorders (atypical lymphocytosis) in the MIC-affected population along with previous reports on the cytogenetic and humoral immune system linking cancer risk and chronic obstructive pulmonary disease (COPD) are important.
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Affiliation(s)
- Chinnu Sugavanam Senthilkumar
- Department of Research, Clinical Cytogenetics Laboratory, Jawaharlal Nehru Cancer Hospital & Research Centre (JNCHRC), Bhopal, Madhya Pradesh, India
- Rajiv Gandhi Technological University (RGTU), Bhopal, Madhya Pradesh, India
| | - Nand Kishore Sah
- Department of Life Sciences (Botany), TNB College, TM Bhagalpur University, Bhagalpur, Bihar, India
| | - Narayanan Ganesh
- Department of Research, Clinical Cytogenetics Laboratory, Jawaharlal Nehru Cancer Hospital & Research Centre (JNCHRC), Bhopal, Madhya Pradesh, India
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10
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A retrospective review of cytogenetic studies on methyl isocyanate with special reference to the Bhopal gas tragedy: is the next generation also at risk? Int J Occup Med Environ Health 2013; 26:324-36. [PMID: 23857370 DOI: 10.2478/s13382-013-0110-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Accepted: 04/25/2013] [Indexed: 11/20/2022] Open
Abstract
The world's worst industrial disaster, at Union Carbide, Bhopal, India, took place on 2-3 December 1984, leading to the leakage of poisonous methyl-isocyanate into the environment, causing thousands of deaths, pregnancy loss and for some, incapacitation for life. More than a quarter of a century later, the Indian Council of Medical Research undertook to redefine the abysmal consequences of the toxic gas exposure on the exposed population. This invigorated the interest of scientific community in the evaluation of the long-term effects, with reference to cytogenetic parameters. The thrust area was identified in terms of genetic disorders, low birth weight, developmental/growth disorders and congenital malformations. Also the impact on epigenetic factors, which may have contributed to variations in the functional expression of genes, was not negated, stimulating intense scientific research on in utero exposure and the progeny of the exposed population. To accomplish this mammoth task, molecular cytogenetic investigations must be undertaken in conjunction with conventional cytogenetics, using techniques such as FISH, Immuno-FISH, SKY and SNP analysis, to build up a cytogenetic database of the surviving population.
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11
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Sauer UG, Vogel S, Hess A, Kolle SN, Ma-Hock L, van Ravenzwaay B, Landsiedel R. In vivo–in vitro comparison of acute respiratory tract toxicity using human 3D airway epithelial models and human A549 and murine 3T3 monolayer cell systems. Toxicol In Vitro 2013; 27:174-90. [DOI: 10.1016/j.tiv.2012.10.007] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Revised: 10/04/2012] [Accepted: 10/11/2012] [Indexed: 10/27/2022]
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Schaeffer JW, Sargent LM, Sandfort DR, Brazile WJ. A comparison of two sampling methods for the detection of airborne methylene bisphenyl diisocyanate. JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL HYGIENE 2013; 10:213-221. [PMID: 23442121 DOI: 10.1080/15459624.2013.766546] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The purpose of this study was to determine if there was a significant difference between two readily available sampling methodologies for airborne methylene bisphenyl diisocyanate (MDI), which is an essential precursor in the spray-on truck bed lining industry. Seventy-two personal airborne samples of MDI were collected and analyzed from nine spray-on truck bed liner businesses in northern Colorado. Wide ranges of exposure concentrations were encountered during the spray-on application, including concentrations that exceeded the OSHA permissible exposure limit. The highest airborne MDI concentration measured was 690 ppb. A statistically significant difference between field-desorbed and laboratory-desorbed methods was determined. The field-desorbed sampling methodology yielded consistently higher MDI concentrations than the laboratory-desorbed sampling methodology, which suggests that immediate desorption minimizes isocyanate loss and potential underestimations. Results from the analysis of variance also indicated that different facility factors and environmental conditions within each company, such as the use of ventilation or humidity level, affected the MDI concentrations, indicating the potential for better mitigation of exposures using the hierarchy of controls.
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Affiliation(s)
- Joshua W Schaeffer
- Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, Colorado 80523, USA.
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13
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El-Gharabawy RM, El-Maddah EI, Oreby MM, Salem HSA, Ramadan MO. Immunotoxicity and pulmonary toxicity induced by paints in Egyptian painters. J Immunotoxicol 2012; 10:270-8. [PMID: 23046204 DOI: 10.3109/1547691x.2012.714005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Associations between painting, sensitization, and respiratory disease have received little attention, despite the extensive use of paint and paint removal products. The objectives of this study were to investigate the possible immunotoxicity and pulmonary toxicity induced by paints in Egyptian painter workers. This study was carried out on 60 adult males. Subjects were designated as controls (n = 30 healthy persons) or paint-exposed workers (n = 30). The controls and workers were then divided into four equal groups (15 individuals/group): Group I, Control group-never smoked; Group II, Smoker controls; Groups III, paint-exposed non-smoking workers; and Group IV, paint-exposed smoker workers. A complete physical examination, chest radiograph, and pulmonary function test (PFT) were performed with each subject. Serum levels of immunoglobulin (Ig) E and interleukin (IL)-4, -6, and -10, WBC sub-set counts, total numbers of WBC, and leukocyte differentials were also assessed. The pulmonary toxicity due to the paint exposures appeared in the form of allergic manifestations in the respiratory tract, significant reductions in FVC, FEV1, FEV1/FVC ratio and PEF parameters, and a reticular pattern in both lung fields. Immunotoxicity was evidenced by increases in total leukocyte levels, total lymphocytes, CD8(+) T-lymphocytes, B (CD19(+))-lymphocytes, NK (CD3(+)CD16(+)CD56(+)) cells, and eosinophils, as well as a significant decrease in CD4+ T-lymphocyte; there were also significant elevations in serum IgE, IL-4, and IL-6, and a significant reduction in IL-10, levels in these hosts. Based on these results, we assert that repeated paint exposure is associated with pulmonary and immune system toxicities that may lead to an augmentation of allergic diseases.
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Affiliation(s)
- Rehab M El-Gharabawy
- Department of Pharmacology, Faculty of Pharmacy, Tanta University, Tanta, Egypt.
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Senthilkumar CS, Sah NK, Ganesh N. Methyl Isocyanate and Carcinogenesis: Bridgeable Gaps in Scientific Knowledge. Asian Pac J Cancer Prev 2012; 13:2429-35. [DOI: 10.7314/apjcp.2012.13.6.2429] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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15
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Dermal uptake and excretion of 14C-toluene diisocyante (TDI) and 14C-methylene diphenyl diisocyanate (MDI) in male rats. Clinical signs and histopathology following dermal exposure of male rats to TDI. Toxicol Lett 2010; 199:364-71. [DOI: 10.1016/j.toxlet.2010.09.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Revised: 09/27/2010] [Accepted: 09/28/2010] [Indexed: 11/22/2022]
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16
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Mekenyan O, Patlewicz G, Dimitrova G, Kuseva C, Todorov M, Stoeva S, Kotov S, Donner EM. Use of Genotoxicity Information in the Development of Integrated Testing Strategies (ITS) for Skin Sensitization. Chem Res Toxicol 2010; 23:1519-40. [DOI: 10.1021/tx100161j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ovanes Mekenyan
- Laboratory of Mathematical Chemistry, “Prof. As. Zlatarov” University, Bourgas, Bulgaria, and DuPont Haskell Global Centers for Health and Environmental Sciences, 1090 Elkton Road, Newark, Delaware 19711
| | - Grace Patlewicz
- Laboratory of Mathematical Chemistry, “Prof. As. Zlatarov” University, Bourgas, Bulgaria, and DuPont Haskell Global Centers for Health and Environmental Sciences, 1090 Elkton Road, Newark, Delaware 19711
| | - Gergana Dimitrova
- Laboratory of Mathematical Chemistry, “Prof. As. Zlatarov” University, Bourgas, Bulgaria, and DuPont Haskell Global Centers for Health and Environmental Sciences, 1090 Elkton Road, Newark, Delaware 19711
| | - Chanita Kuseva
- Laboratory of Mathematical Chemistry, “Prof. As. Zlatarov” University, Bourgas, Bulgaria, and DuPont Haskell Global Centers for Health and Environmental Sciences, 1090 Elkton Road, Newark, Delaware 19711
| | - Milen Todorov
- Laboratory of Mathematical Chemistry, “Prof. As. Zlatarov” University, Bourgas, Bulgaria, and DuPont Haskell Global Centers for Health and Environmental Sciences, 1090 Elkton Road, Newark, Delaware 19711
| | - Stoyanka Stoeva
- Laboratory of Mathematical Chemistry, “Prof. As. Zlatarov” University, Bourgas, Bulgaria, and DuPont Haskell Global Centers for Health and Environmental Sciences, 1090 Elkton Road, Newark, Delaware 19711
| | - Stefan Kotov
- Laboratory of Mathematical Chemistry, “Prof. As. Zlatarov” University, Bourgas, Bulgaria, and DuPont Haskell Global Centers for Health and Environmental Sciences, 1090 Elkton Road, Newark, Delaware 19711
| | - E Maria Donner
- Laboratory of Mathematical Chemistry, “Prof. As. Zlatarov” University, Bourgas, Bulgaria, and DuPont Haskell Global Centers for Health and Environmental Sciences, 1090 Elkton Road, Newark, Delaware 19711
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17
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Rayat S, Qian M, Glaser R. Nitrosative cytosine deamination. An exploration of the chemistry emanating from deamination with pyrimidine ring-opening. Chem Res Toxicol 2005; 18:1211-8. [PMID: 16097794 PMCID: PMC2546522 DOI: 10.1021/tx050082a] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A discussion of nitrosative deamination of cytosine 1 is presented that argues for the formation of 6 by diazotization of 1 to cytosinediazonium ion 2 and its electrostatic complex 3, dediazoniation to 4 <--> 5, and amide-bond cleavage to 6. The reaction channels available to 6 include hydrolytic deglycation to 3-isocyanatoacrylonitrile 7, water addition to carbamic acid 9 with the possibility for re-closure to uracil 13, water addition to carbamic acid 9, and decarboxylation to 3-aminoacrylonitrile 10. With a view to the instability of the carbamic acid 9, the carbamate models ethyl (Z)-2-cyanovinylcarbamate 14 and (Z)-2-cyano-1-tert-butylvinylcarbamate 20 were studied. Acid-catalyzed hydrolysis of 14 leads to 2-amino-carbonylphenylcarbamate 15, and its cyclization yields the benzo-fused uracil quinazoline-2,4-dione 16. In contrast to the aromatic system 14, acid-catalyzed cyclization cannot compete with oligomerization in the case of 20, and 5-tert-butyluracil 22 is accessible only with base-catalysis. It is shown that 23, the parent of 10, also easily polymerizes. The experimental results provide a rationale as to why 9, 10, and 12 would have escaped detection in in vitro studies: they would have oligomerized. In contrast to the in vitro experiments, the oligomerizations of 9, 10, or 12 clearly are not relevant in vivo because of low monomer concentrations. With the exclusion of recyclization and of oligomerization in vivo, attention thus needs to focus on (Z)-3-aminoacrylonitrile 10 as the most likely deamination product of cytosine aside from uracil.
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Affiliation(s)
| | | | - Rainer Glaser
- *To whom correspondence should be addressed. . Fax: (573) 882-2754
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