Increased frequencies of micronucleated reticulocytes and T-cell receptor mutation in Aldh2 knockout mice exposed to acetaldehyde

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  • Kunugita Naoki
    Department of Health Information Science, School of Health Sciences, University of Occupational and Environmental Health
  • Isse Toyohi
    Department of Environmental Health, School of Medicine, University of Occupational and Environmental Health
  • Oyama Tsunehiro
    Department of Environmental Health, School of Medicine, University of Occupational and Environmental Health
  • Kitagawa Kyoko
    First Department of Biochemistry, Hamamatsu University School of Medicine
  • Ogawa Masanori
    Department of Environmental Health, School of Medicine, University of Occupational and Environmental Health
  • Yamaguchi Tetsunosuke
    Department of Environmental Health, School of Medicine, University of Occupational and Environmental Health
  • Kinaga Tsuyoshi
    Department of Environmental Health, School of Medicine, University of Occupational and Environmental Health
  • Kawamoto Toshihiro
    Department of Environmental Health, School of Medicine, University of Occupational and Environmental Health

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Abstract

Aldehyde dehydrogenase-2 (ALDH2) metabolizes acetaldehyde produced from ethanol into acetate and plays a major role in the oxidation of acetaldehyde in vivo. About half of all Japanese people have inactive ALDH2. We generated homozygous Aldh2 null (Aldh2-/-) mice by gene targeting knockout as a model of ALDH2-deficient humans. To investigate the mutagenicity of acetaldehyde, a micronucleus assay and a T-cell receptor (TCR) gene mutation assay were performed in Aldh2-/- mice and wild-type (Aldh2 +/+) mice exposed to acetaldehyde. The mice were continuously exposed to 125 and 500 ppm of acetaldehyde vapor for 2 weeks. Another group was orally administered 100 mg/kg once a day for 2 weeks continuously. The mice were killed after 2 weeks of exposure to acetaldehyde, and the frequency of micronucleated reticulocytes was measured by flow cytometry. We also observed the incidence of TCR gene mutations in T-lymphocytes by measuring the variant CD3−CD4+ expression by flow cytometry. The frequency of micronucleated reticulocytes induced by acetaldehyde was significantly increased in Aldh2 −/− mice, but not in Aldh2 +/+ mice. TCR mutant frequency was also associated with acetaldehyde exposure in Aldh2−/ − mice, especially after oral administration; however, it was not associated with acetaldehyde exposure in Aldh2 +/+ mice. In conclusion, Aldh2 −/− mice showed high sensitivity in the micronuclei and TCR mutation assays compared with Aldh2 +/+ mice after exposure to acetaldehyde.<br>

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