Jaroslav A Hubacek1, Ivana Kurcova2, Vera Maresova2, Alexandra Pankova3,4, Lenka Stepankova3, Kamila Zvolska3, Vera Lanska5, Eva Kralikova3,4. 1. Centre for Experimental Medicine, Institute for Clinical and Experimental Medicine, Prague, Czech Republic. 2. Department of Toxicology and Forensic Medicine, 1st Faculty of Medicine, Charles University and General University Hospital in Prague, Czech Republic. 3. Centre for Tobacco-Dependent, 3rd Department of Medicine - Department of Endocrinology and Metabolism, 1st Faculty of Medicine, Charles University and the General University Hospital in Prague, Czech Republic. 4. Institute of Hygiene and Epidemiology, 1st Faculty of Medicine, Charles University and the General University Hospital in Prague, Czech Republic. 5. Statistical Unit, Institute for Clinical and Experimental Medicine, Prague, Czech Republic.
Abstract
AIM: Plasma values of nicotine and its metabolites are highly variable, and this variability has a strong genetic influence. In our study, we analysed the impact of common polymorphisms associated with smoking on the plasma values of nicotine, nicotine metabolites and their ratios and investigated the potential effect of these polymorphisms and nicotine metabolite ratios on the successful treatment of tobacco dependence. METHODS: Five variants (rs16969968, rs6474412, rs578776, rs4105144 and rs3733829) were genotyped in a group of highly dependent adult smokers (n=103). All smokers underwent intensive treatment for tobacco dependence; 33 smokers were still abstinent at the 12-month follow-up. RESULTS: The rs4105144 (CYP2A6, P<0.005) and rs3733829 (EGLN2, P<0.05) variants were significantly associated with plasma concentrations of 3OH-cotinine and with 3OH-cotinine: cotinine ratios. Similarly, the unweighted gene score was a significant (P<0.05) predictor of both cotinine:nicotine and 3OH-cotinine:cotinine ratios. No associations between the analysed polymorphisms or nicotine metabolite ratios and nicotine abstinence rate were observed. CONCLUSION: Although CYP2A6 and EGLN2 polymorphisms were associated with nicotine metabolism ratios, neither these polymorphisms nor the ratios were associated with abstinence rates.
AIM: Plasma values of nicotine and its metabolites are highly variable, and this variability has a strong genetic influence. In our study, we analysed the impact of common polymorphisms associated with smoking on the plasma values of nicotine, nicotine metabolites and their ratios and investigated the potential effect of these polymorphisms and nicotine metabolite ratios on the successful treatment of tobacco dependence. METHODS: Five variants (rs16969968, rs6474412, rs578776, rs4105144 and rs3733829) were genotyped in a group of highly dependent adult smokers (n=103). All smokers underwent intensive treatment for tobacco dependence; 33 smokers were still abstinent at the 12-month follow-up. RESULTS: The rs4105144 (CYP2A6, P<0.005) and rs3733829 (EGLN2, P<0.05) variants were significantly associated with plasma concentrations of 3OH-cotinine and with 3OH-cotinine: cotinine ratios. Similarly, the unweighted gene score was a significant (P<0.05) predictor of both cotinine:nicotine and 3OH-cotinine:cotinine ratios. No associations between the analysed polymorphisms or nicotine metabolite ratios and nicotine abstinence rate were observed. CONCLUSION: Although CYP2A6 and EGLN2 polymorphisms were associated with nicotine metabolism ratios, neither these polymorphisms nor the ratios were associated with abstinence rates.
Authors: Thaka'a K Al-Omoush; Karem H Alzoubi; Omar F Khabour; Fawzi M Alsheyab; Ahmed Abu-Siniyeh; Nour A Al-Sawalha; Fadia A Mayyas; Caroline O Cobb; Thomas Eissenberg Journal: Arab J Basic Appl Sci Date: 2020-11-24