RESUMO
OBJECTIVE: To evaluate an effect of ethylmethylhydroxypyridine succinate and ethylmethylhydroxypyridine malate on changes in mitochondrial function under experimental focal cerebral ischemia. MATERIAL AND METHODS: Focal cerebral ischemia was modeled in Wistar rats by thermocoagulation of the middle cerebral artery. Ethylmethylhydroxypyridine succinate («Mexidol¼) and ethylmethylhydroxypyridine malate («Ethoxidol¼) were injected into the tail vein 30 minutes after ischemia simulation and then for 3 days at doses of 50 mg/kg, 100 mg/kg and 150 mg/kg. After 72 hours, changes in neurological deficits, aerobic and anaerobic respiration activity, the concentration of mitochondrial hydrogen peroxide and apoptosis-inducing factor, as well as the activity of succinate dehydrogenase and cytochrome c oxidase in brain tissue supernatants were assessed. RESULTS: The course administration of ethylmethylhydroxypyridine succinate and ethylmethylhydroxypyridine malate dose-dependently contributed to a decrease in the concentration of mitochondrial hydrogen peroxide and apoptosis-inducing factor in the brain tissue. The restoration of mitochondrial energy function was also shown with the use of ethylmethylhydroxypyridine succinate in all studied doses, while the administration of ethylmethylhydroxypyridine malate led to the restoration of mitochondrial-dependent energy production only at higher doses (100 mg/kg and 150 mg/kg). CONCLUSION: The effect of malic acid and succinic acid salts of ethylmethylhydroxypyridine on the change in the redox and apoptosis-regulating function of mitochondria does not depend on the type of anion, whereas the change in the energy function of mitochondria is associated with the salt residue included in the drug structure and its dosage.
