Study of Endothelial Protective Activity of Phenol-Derived Thrombin and Arginase-2 Inhibitors KUD-259 and KUD-974

Correction of morphofunctional disorders of the cardiovascular system with asialized erythropoietin and arginase II selective inhibitors KUD 974 and KUD 259 in experimental preeclampsia

Introduction: Preeclampsia remains one of the most common causes of maternal and perinatal mortality worldwide. A significant role in the pathogenesis of this pathology is assigned to placental ischemia and endothelial dysfunction. Therefore, the aim of the present study was to study the effectiveness of asialized erythropoietin and arginase II selective inhibitors: KUD-259 and KUD-974 in the correction of morphofunctional disorders of the cardiovascular system in experimental preeclampsia.

Materials and methods: The study was performed in 260 female Wistar rats, each weighing 250–300 g. An ADMA-like preeclampsia was reproduced in the experiment. To assess the emerging morphofunctional disorders, the following parameters were used: blood pressure, coefficient of endothelial dysfunction, microcirculation in the placenta, proteinuria, fluid content in the omentum, concentration of terminal metabolites in the blood plasma, and morphometric parameters of fetuses.

Results and discussion: The administration of arginase II selective inhibitor KUD-974 in combination with asialized erythropoietin leads to a pronounced correction of emerging changes: a decrease in systolic and diastolic blood pressure in 1.5 and 1.7 times, a decrease in proteinuria in 3.6 times and a decrease in fluid content in the omentum. When arginase II selective inhibitor KUD 974 and asialized erythropoietin are used with methyldopa, the positive effects of the former are enhanced.

Conclusion: Arginase II selective inhibitors KUD-259 and KUD-974 and asialized erythropoietin have a pronounced positive effect on the correction of morphofunctional disorders in animals with ADMA-like preeclampsia.

2-aminoaethanesulfonic acid compounds possess protective property in reperfusion-induced heart jnjury

The study aim was to explore pharmacological effects of 2-aminoaethansulfonic acid compounds in reperfusion-induced heart injury.

Materials and methods.The study was performed on rats and dogs of both sexes, isolated rats’ hearts. Two compounds of 2-aminoethanesulfonic acid, magnesium-containing (LBK-527) and phenylacetamide-containing (LKhT-317) were investigated. Antiarrhythmic effects of the compounds were studied in coronary artery reperfusion 7, 30 and 120 min after acute myocardial ischemia modeling. The ability of the substances to limit the volume of reperfusion injury was investigated by differential indicator method. The influence of substances on the intensity of free radical processes in the myocardium, as well as the metabolic profile of coronary venous blood during reperfusion, was studied. Hemodynamic effects of the substances were studied during in vivo experiments, as well as on an isolated heart.

Results and Discussion.The compounds effectively prevent cardiac arrhythmias generation caused by myocardial reperfusion after 7, 30 and 120 minutes of ischemia. Prophylactic intravenous administration of LHT-317 and LBK-527 at higher therapeutic doses limit the size of rats’ heart necrosis zone after occlusion-reperfusion syndrome develops, prevent reperfusion-induced excessive activation of free-radical processes in rat myocardium, activate the antiradical activity of the heart tissues, and optimize [O2] and [CO2] in coronary venous sinus blood of dogs. Cardioprotective effect of the compounds manifests in preserving myocardium contractile function, maintaing BP and stabilizing heart chronotropic function.

Conclusions.The study analysis shows that 2-aminoethanesulfonic acid compounds have cardioprotective effect in reperfusion syndrome.