title: Susceptibility to inhalation toxicity of acetaldehyde in Aldh2 knockout mice.
abstract: In this study, we evaluated the inhalation toxicity of acetaldehyde in Aldh2 KO (Aldh -/-) mice, using pathological method. Male C57BL/6 (Aldh2 +/+) mice and Aldh -/- mice were exposed to atmospheres containing acetaldehyde at levels of 0, 125, and 500 ppm for 24 h/day during 14 days. Although the average blood acetaldehyde concentration of Aldh -/- mice was higher than that of Aldh2 +/+ mice in the acetaldehyde exposure group, observable effects by the acetaldehyde exposure on the lung and liver were not different between wild type and ALDH2 null mice. In Aldh2 -/- mice, the levels of 1) erosion of respiratory epithelium and the subepithelial hemorrhage in nose, 2) hemorrhage in nasal cavity, 3) degeneration of respiratory epithelium in larynx, pharynx and trachea, and 4) degeneration of dorsal skin were higher compared with Aldh2 +/+ mice, indicating that Aldh2 -/- mice are more acetaldehyde-sensitive than Aldh2 +/+ mice. This is the first example for studying pathological effects of Aldh2 deficiency using Aldh -/- mice exposed to a low level of acetaldehyde.
authors.affiliation: Department of Environmental Health, University of Occupational and Environmental Health, Kitakyushu, 807-8555, Japan. oyama@med.uoeh-u.ac.jp
authors.forename: Tsunehiro
authors.initials: T
authors.lastname: Oyama
authors.forename: Toyohi
authors.initials: T
authors.lastname: Isse
authors.forename: Masanori
authors.initials: M
authors.lastname: Ogawa
authors.forename: Manabu
authors.initials: M
authors.lastname: Muto
authors.forename: Iwao
authors.initials: I
authors.lastname: Uchiyama
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Kawamoto
mesh_terms: D000079:Acetaldehyde / Q000008:administration & dosage / Q000097:blood / Q000633:toxicity*; D000444:Aldehyde Dehydrogenase / Q000172:deficiency* / Q000235:genetics; D000071396:Aldehyde Dehydrogenase, Mitochondrial; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D003677:Deficiency Diseases / Q000473:pathology; D004431:Ear, External / Q000473:pathology; D019570:Inhalation Exposure; D008099:Liver / Q000473:pathology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009296:Nasal Cavity / Q000473:pathology; D009666:Nose / Q000473:pathology; D012137:Respiratory System / Q000473:pathology; D012867:Skin / Q000473:pathology
chemical_list: C515029:ALDH2 protein, mouse; D000444:Aldehyde Dehydrogenase; D000071396:Aldehyde Dehydrogenase, Mitochondrial; D000079:Acetaldehyde