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Deficiencies in mitochondrial low-Km aldehyde dehydrogenase (ALDH2) activity, and consequently high blood acetaldehyde levels, have been suggested to relate to various diseases in Japanese, including esophageal cancer. In the present study, 200 men aged 35-59 years randomly selected from an occupational population were analyzed for the association of ALDH2 genotypes and cytochrome P450-2E1 (CYP2E1) genotypes with the urinary excretion of acetaldehyde (which is bound to some chemicals in the urine) and with common alcohol-related health consequences. Urinary acetaldehyde excretion was increased, reflecting increased alcohol consumption even in this moderate alcohol-consuming population. Neither the ALDH2 nor the CYP2E1 genotypes showed significant influence on the elevation of urinary acetaldehyde excretion. Neither these genotypes nor urinary acetaldehyde concentration significantly affected blood pressure, serum aspartate aminotransferase and gamma-glutamyl transferase activities, or serum HDL-cholesterol and lipid peroxide concentrations. It was concluded that acetaldehyde accumulates in moderate alcohol consumers irrespective of ALDH2 and CYP2E1 genotype, and that the implications of these genotypes and acetaldehyde accumulation in terms of common alcohol-related health consequences were obscure. The results also suggest that the carcinogenicity of acetaldehyde on esophageal mucosa depends greatly upon repeated exposure to high blood acetaldehyde, even through transient rather than chronic exposure.

ALDH2 and CYP2E1 genotypes, urinary acetaldehyde excretion and the health consequences in moderate alcohol consumers