On the cardiovascular effects mechanism of humic nature macromolecular compounds

Abstract

Introduction. The search for new drugs to reduce effectively myocardial damage during ischemia and reoxygenation is relevant considering that many pharmacological drugs have a number of limitations for patients and their use is accompanied by negative side effects.Aim: To assess the NO-synthase possible role in the cardiovascular effects mechanism of the standardized active pharmaceutical substance (AFS) of the humic acids (HA) isolated from peat.Material and Methods. The experiments were carried out on the isolated perfused rat heart model using the Langendorff method. We studied the effect of a standardized sample of peat HA at concentrations of 0.001; 0.01; 0.1 mg/ml on coronary perfusion rate and myocardial contractility parameters. To assess the NO-synthase value in the HA effects realization, the enzyme was pre-inhibited using L-NAME (10 µM/L) before the test sample addition.Results. HA sample using contributed to an effective increase in the heart coronary perfusion rate due to the NO-synthase signaling mechanism activation. There was some decrease in contractility and end-diastolic pressure associated with the NOsynthase activation because the enzyme inhibition with L-NAME removed all effects of the test HA sample.Conclusion. The obtained data show to the peat HA have vasodilating properties associated with the NO-synthase activation. The such effect presence indicates on the prospects for further investigation of these compounds cardiotropic properties in the order developing new effective means for improving intracardiac hemodynamics and limiting Ca2+ overload of cardiomyocytes in conditions of ischemia and reperfusion.