The purpose of the study was to determine the effect of different concentrations of carbon monoxide on the metabolism of isolated mice hearts. Materials and methods. To elucidate the effect of low concentrations of carbon monoxide on the myocardium, we performed retrograde perfusion of isolated hearts of laboratory mice with Krebs-Henseleit solution, which was saturated with carbon monoxide for 5, 10, and 30 minutes. We then determined how different concentrations of carbon monoxide affected coronary volumetric flow rate, myocardial glucose and calcium uptake, creatinine release, and aspartate aminotransferase release. During perfusion, R-wave amplitude and R-R interval were measured using an electrocardiograph. To determine the effect of ischemia on the heart muscle during perfusion with solutions of different concentrations, we measured the area of the affected myocardium after staining with 2,3,5-triphenyltetrazolium chloride. Results and discussion. After these studies, it was found that different concentrations of carbon monoxide had a dose-dependent effect on the isolated mouse heart. However, the dependence of the effects does not follow the pattern «lowest concentration – lowest effect». At the same time, an increase in concentration did not mean an increase in adverse effects on the myocardium. Even on the contrary, the smallest concentration led to increased signs of ischemic myocardial damage. In particular, the use of the solution, through which carbon monoxide was passed for 5 minutes, caused vasoconstrictor effect during perfusion. At the end of reperfusion, vasoconstrictor effect was observed after using a solution through which carbon monoxide was passed for 10 minutes. Increased glucose uptake was observed in the group with 30-minute carbon monoxide permeation against the background of the minimal myocardial creatinine release. In this group there was also a decrease in Ca2+ loss at the beginning of reperfusion (immediately after ischemia). The above phenomenon explains the least degree of ischemic myocardial damage in the isolated mouse heart. The obtained data should be expanded. Since it is difficult to accurately determine the dose of carbon monoxide, then the use of donor compounds is promising. Such compounds include CORM-2 and CORM-3. Under physiological conditions, they decompose in a controlled manner, releasing a specific amount of carbon monoxide. Conclusion. The obtained results indicate that at different concentrations of carbon monoxide can differently influence different structures of cardiomyocyte: at one concentration it binds to calcium channels, other concentrations influence ion channels of plasma membrane, which can explain all these dependencies

Keywords: isolated heart, carbon monoxide, volumetric rate, glucose, creatinine

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