Effect of nadcin on energy supply system and apoptosis in ischemia-reperfusion injury to the myocardium.

Nadcin in a dose of 90 mg/kg administered to dogs with subacute stage of ischemia-reperfusion myocardial injury immediately after blood flow resumption normalized redox potential of cardiomyocytes and mitochondria and restored the total content of adenyl and pyridine nucleotides. The decrease in the synthesis of ATP and pyridine nucleotides and reduction of the redox potential of the energy supply system were inversely related to the increase in poly-(ADP-ribose)-polymerase activity in the ischemic area and nonischemic region. Nadcin abolished the increase in poly-(ADP-ribose)-polymerase activity in the ischemic area of the right ventricle, nonischemic region, and ischemic area of the left ventricle (by 2.4, 2.9, and 1.52 times, respectively) and normalized bioenergetic activity of cardiomyocytes during ischemia-reperfusion myocardial injury.

[Cardioprotective effect of energostim in toxic allergic myocarditis]. / Kardioprotektornoe deistvie énergostima pri toksiko-allergicheskom miokardite.

Energostim is a combined drug comprising a mixture of nicotinamide adenine dinucleotide (0.5 mg), cytochrome C (10 mg), and inosine (80 mg), representing antihypoxant and antioxidant of direct action in one ampule. After pretreatment and subsequent 3-day energostim therapy of animals with 3-day toxico-allergic myocarditis (3d-TAM), the ECG was free of any rhythm disorders and showed evidence of improved conduction, restoration of the normal form of T-wave and the position of ST segment, while the content of myofibrillar fraction of creatine phosphokinase and toxic products of disturbed metabolism (degree of endotoxemia) decreased to the upper normal level. Under the action of energostim, neither pressure nor the maximum rate of pressure buildup in the left ventricle are reduced (as they do upon 3d-TAM); neither systolic and diastolic functions are disturbed, nor their coordination (r = 0.79 between dP/dtmin and dP/dtmax, p < 0.01). The restoration of contractile activity and maximum rate of relaxation of myocardial microfibrils during 3d-TAM is accompanied by an increase in the content of adenyl nucleotides, in the ATP/ADP, ADP/AMP, NAD/NADH, and NADP/NADPH ratios, and in the cytosol phosphorylation potential. The energostim-induced improvement in the energy supply system are accompanied by restoration of the ability of sarcoplasmic reticulum to efflux Ca2+. Thus, it is demonstrated that the effect of energostim is related to its ability to actively participate in intracell metabolic processes in myocardium, abolish necrotic changes and endotoxicosis, and restore homeostasis in the systems responsible for the contraction--relaxation process (thus preventing from the development of dysfunction of the left ventricle and the heart failure).