Grant Number:	1R01CA203851-01A1 Interpret this number
Primary Investigator:	Hecht, Stephen
Organization:	University Of Minnesota
Project Title:	E-CIGARETTES: Formaldehyde DNA Adducts, Oxidative Damage, and Potential Toxicity and Carcinogenesis
Fiscal Year:	2017

e-Cigarettes, also known as electronic nicotine delivery systems (ENDS), are a rapidly growing nicotine delivery product with millions of users in the United States and worldwide. All e-cigarettes have common features: a battery; a tank containing propylene glycol or vegetable glycerin, flavoring agents, and nicotine; a microprocessor; an activating button; and, in some, a variable voltage heating element. The heating element vaporizes the solution producing liquid aerosol droplets containing nicotine. The amount of nicotine inhaled is controlled by the user by varying the voltage. There is little doubt that e-cigarettes are safer than tobacco cigarettes because they lack tobacco and combustion. However, the safety of e-cigarettes per se requires evaluation, particularly in view of recent reports that they may generate unacceptable levels of the human carcinogen formaldehyde, and our preliminary data indicating that levels of urinary biomarkers of oxidative damage and inflammation – the F2-isoprostane 8-iso-PGF2α and the prostaglandin E2 metabolite PGEM - are the same in e- cigarette users as in cigarette smokers. Therefore, we will test the hypothesis that e-cigarette use leads to formaldehyde-DNA adducts and elevated exposure to other carbonyls, and to similar levels of oxidative damage and inflammation as in smokers, and will assess toxicant and carcinogen exposure in e-cigarette users, smokers, and non-smokers. Our specific aims are: 1. Quantify exogenous [13CD2]formaldehyde-DNA adducts and unlabeled endogenous formaldehyde-DNA adducts in tissues of rats exposed to vapor generated from e-liquids containing [1-13CD2]propylene glycol. 2. Using samples from a prior study in which smokers stopped smoking for 12 weeks, determine the time course of decreases in formaldehyde-DNA adducts in leukocytes, and 8-iso-PGF-2α and PGEM in urine.3. Recruit 134 e-cigarette tank system users, 134 smokers, and 134 non-users of any e-cigarette or tobacco product and compare levels of formaldehyde, diacetyl, and other carbonyl compounds in saliva (before and after puffing in the e-cigarette users and smokers), formaldehyde-DNA adducts in oral cells and leukocytes, 8-iso-PGF-2α and PGEM in urine, the serum biomarker of inflammation C-reactive protein, as well as a panel of urinary toxicant and carcinogen biomarkers, sampled monthly for 6 months. Only e-cigarette users who have not smoked a tobacco cigarette for the amount of time determined to be necessary for clearance of biomarkers to non-smoker levels in Specific Aim 2 will be enrolled, and this group will include e-cigarette users who operate their devices at predominantly high and low voltages (above and below 4V) as well as some individuals who will vary the voltage of their e-cigarette system.Collectively, the results of this study will critically test our hypothesis and provide important data on the potential risks of e-cigarette use with respect to the human carcinogen formaldehyde and other carbonyl compounds, oxidative damage and inflammation, and exposure to a panel of toxicants and carcinogens.




DNA damage in human oral cells induced by use of e-cigarettes.
Authors: Guo J. , Hecht S.S. .
Source: Drug Testing And Analysis, 2022-09-28 00:00:00.0; , .
EPub date: 2022-09-28 00:00:00.0.
PMID: 36169810
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Increased Levels of the Acrolein Metabolite 3-Hydroxypropyl Mercapturic Acid in the Urine of e-Cigarette Users.
Authors: Chen M. , Carmella S.G. , Lindgren B.R. , Luo X. , Ikuemonisan J. , Niesen B. , Thomson N.M. , Murphy S.E. , Hatsukami D.K. , Hecht S.S. .
Source: Chemical Research In Toxicology, 2022-07-20 00:00:00.0; , .
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Liquid Chromatography-Nanoelectrospray Ionization-High-Resolution Tandem Mass Spectrometry Analysis of Apurinic/Apyrimidinic Sites in Oral Cell DNA of Cigarette Smokers, e-Cigarette Users, and Nonsmokers.
Authors: Guo J. , Ikuemonisan J. , Hatsukami D.K. , Hecht S.S. .
Source: Chemical Research In Toxicology, 2021-12-20 00:00:00.0; 34(12), p. 2540-2548.
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Identification and quantification of phenanthrene ortho-quinones in human urine and their association with lipid peroxidation.
Authors: Luo K. , Carmella S.G. , Zhao Y. , Tang M.K. , Hecht S.S. .
Source: Environmental Pollution (barking, Essex : 1987), 2020 Nov; 266(Pt 1), p. 115342.
EPub date: 2020-08-06 00:00:00.0.
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Large Differences in Urinary Benzene Metabolite S-Phenylmercapturic Acid Quantitation: A Comparison of Five LC-MS-MS Methods.
Authors: Tevis D.S. , Willmore A. , Bhandari D. , Bowman B. , Biren C. , Kenwood B.M. , Jacob P. , Liu J. , Bello K. , Hecht S.S. , et al. .
Source: Journal Of Analytical Toxicology, 2020-10-07 00:00:00.0; , .
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Authors: Cheng G. , Reisinger S.A. , Shields P.G. , Hatsukami D.K. , Balbo S. , Hecht S.S. .
Source: Chemico-biological Interactions, 2020-08-25 00:00:00.0; 327, p. 109140.
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Authors: Luo K. , Hochalter J.B. , Carmella S.G. , Hecht S.S. .
Source: Journal Of Chromatography. B, Analytical Technologies In The Biomedical And Life Sciences, 2020-03-15 00:00:00.0; 1141, p. 122023.
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Effects of cessation of cigarette smoking on eicosanoid biomarkers of inflammation and oxidative damage.
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