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  • 1 Department of Clinical Pathomorphology Medical University of Lublin 8 Jaczewskiego Str, PL-20950 Lublin, Poland
  • 2 Experimental Teratology Unit of the Human Anatomy Department 8 Jaczewskiego Str, PL-20950 Lublin, Poland
  • 3 Department of Human Anatomy 8 Jaczewskiego Str, PL-20950 Lublin, Poland
  • 4 Department of Clinical Pathomorphology Medical University of Lublin 8 Jaczewskiego Str PL-20950 Lublin, Poland
  • 5 Department of Jaw Orthopaedics, Medical University 8 Jaczewskiego Str, PL-20950 Lublin, Poland
  • 6 Experimental Teratology Unit of the Human Anatomy Department 8 Jaczewskiego Str, PL-20950 Lublin, Poland
  • 7 Department of Clinical Pathomorphology Medical University of Lublin 8 Jaczewskiego Str, PL-20950 Lublin, Poland
  • 8 Department of Clinical Pathomorphology Medical University of Lublin 8 Jaczewskiego Str, PL-20950 Lublin, Poland
  • 9 Department of Clinical Pathomorphology Medical University of Lublin 8 Jaczewskiego Str, PL-20950 Lublin, Poland
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Metabolic acidosis complicates methanol, ethylene glycol and other alcohol intoxications. It is caused firstly by acid metabolites and secondly by the lactate elevation. The aim of the study was to evaluate the effect of alcohol dehydrogenase (ADH; EC 1.1.1.1) inhibitors and substrates: 4-methylpyrazole (4-MP), cimetidine, EDTA, ethanol and methanol on lactate dehydrogenase (LDH; EC 1.1.1.27) activity. The activity of LDH was determined spectrophotometrically in in vitro human heart homogenates with the mentioned compounds at 0.01, 0.1, 1.0 mM concentrations of 4-MP, cimetidine, EDTA, and 12.5, 25.0, 50.0 mM of ethanol and methanol. The LDH activity was significantly inhibited by 0.1 mM (p<0.05) and 1.0 mM (p<0.01) 4-MP and 1.00 mM EDTA (p<0.05). Higher LDH activity vs. control was observed in the samples incubated with all studied ethanol and methanol concentrations but these differences were not statistically significant. Thus, 4-MP was found to be the most effective inhibitor of LDH of all compounds tested. Therefore, such effect of 4-MP seems to be an additional advantage in methanol and ethylene glycol intoxications.

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