title: The activity of class I, II, III, and IV alcohol dehydrogenase (ADH) isoenzymes and aldehyde dehydrogenase (ALDH) in liver cancer.
abstract: BACKGROUND
  Alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH), which are most abundant in the liver, are the main enzymes involved in ethanol and acetaldehyde metabolism.
  
  
  OBJECTIVE
  The purpose of this study was to compare the activity of ADH isoenzymes and ALDH between liver carcinoma cells and healthy hepatocytes.
  
  
  METHODS
  Samples were taken from 44 liver cancer patients (19 drinkers, 25 nondrinkers). Seventeen patients had primary liver tumors and 27 had metastatic liver tumors.
  
  
  METHODS
  Fluorimetric methods were used for measurement of the activity of class I and II ADH isoenzymes and ALDH activity. Total ADH activity and activity of class III and IV isoenzymes were measured by a photometric method.
  
  
  RESULTS
  The activities of total ADH, ALDH, and class I ADH were significantly higher in cancer cells than in healthy tissues. The other tested classes of ADH showed a tendency toward higher activity in cancer than in normal cells. The differences between enzymes of drinkers and nondrinkers in both cancer and healthy tissue, were not significant.
  
  
  CONCLUSIONS
  Differences in the activities of total ADH, ALDH and class I ADH isoenzyme between cancer liver tissues and healthy hepatocytes might be a factor in ethanol metabolism disorders, which can intensify carcinogenesis.
authors.affiliation: Department of Biochemical Diagnostics, Medical Academy, Skłodowskiej-Curie 24 A, Bialystok, Poland. wjelski@amb.edu.pl
authors.forename: Wojciech
authors.initials: W
authors.lastname: Jelski
authors.forename: Bogdan
authors.initials: B
authors.lastname: Zalewski
authors.forename: Maciej
authors.initials: M
authors.lastname: Szmitkowski
mesh_terms: D000328:Adult; D000368:Aged; D000426:Alcohol Dehydrogenase / Q000378:metabolism*; D000444:Aldehyde Dehydrogenase / Q000378:metabolism*; D000445:Aldehyde Oxidoreductases / Q000378:metabolism*; D001706:Biopsy; D006528:Carcinoma, Hepatocellular / Q000201:enzymology* / Q000473:pathology; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007527:Isoenzymes / Q000378:metabolism; D008113:Liver Neoplasms / Q000201:enzymology* / Q000473:pathology; D008297:Male; D008875:Middle Aged
chemical_list: D007527:Isoenzymes; D000426:Alcohol Dehydrogenase; C105552:alcohol dehydrogenase IV; C020145:formaldehyde dehydrogenase (glutathione); D000445:Aldehyde Oxidoreductases; D000444:Aldehyde Dehydrogenase