Nicotine enhances alcoholic fatty liver in mice: Role of CYP2A5

Xue Chen, Emmanuel Owoseni, Julia salamat, Arthur I. Cederbaum, Yongke Lu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Tobacco and alcohol are often co-abused. Nicotine can enhance alcoholic fatty liver, and CYP2A6 (CYP2A5 in mice), a major metabolism enzyme for nicotine, can be induced by alcohol. CYP2A5 knockout (cyp2a5−/−) mice and their littermates (cyp2a5+/+) were used to test whether CYP2A5 has an effect on nicotine-enhanced alcoholic fatty liver. The results showed that alcoholic fatty liver was enhanced by nicotine in cyp2a5+/+ mice but not in the cyp2a5−/− mice. Combination of ethanol and nicotine increased serum triglyceride in cyp2a5+/+ mice but not in the cyp2a5−/− mice. Cotinine, a major metabolite of nicotine, also enhanced alcoholic fatty liver, which was also observed in cyp2a5+/+ mice but not in the cyp2a5−/− mice. Nitrotyrosine and malondialdehyde (MDA), markers of oxidative/nitrosative stress, were induced by alcohol and were further increased by nicotine and cotinine in cyp2a5+/+ mice but not in the cyp2a5−/− mice. Reactive oxygen species (ROS) production during microsomal metabolism of nicotine and cotinine was increased in microsomes from cyp2a5+/+ mice but not in microsomes from cyp2a5−/− mice. These results suggest that nicotine enhances alcoholic fatty liver in a CYP2A5-dependent manner, which is related to ROS produced during the process of CYP2A5-dependent nicotine metabolism.

Original languageEnglish
Pages (from-to)65-73
Number of pages9
JournalArchives of Biochemistry and Biophysics
Volume657
DOIs
StatePublished - 1 Nov 2018

Keywords

  • CYP2A6
  • Cotinine
  • Metabolism
  • Oxidative stress
  • Reactive oxygen species
  • Triglyceride

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