JnK inhibitor 11H-indeno [1,2-b]chinoxalin-11-on-oxim sodium salt reduces the development of diastolic dysfunction in spontaneously hypertensive rats

Background. In arterial hypertension (HTN), diastolic dysfunction (DD) of the left ventricle (LV) makes a major contribution to the development of heart failure, so the treatment of DD is an important task. The role of the JNK-dependent pathway in myocardial remodeling in HTN is shown. Objective. To evaluate the effect of the new JNK inhibitor IQ-1S (11H-indeno [1,2-b]quinoxalin-11-one oxime sodium salt) on parameters of cardiac activity in SHR rats during the period of stable HTN and the formation of DD. Design and methods . The experiments were carried out on 5 normotensive Wistar-Kyoto (WKY) rats and 10 spontaneously hypertensive rats (SHRs); the experiments included animals that reached the age of 12 weeks. IQ- 1S (50 mg/kg) was administered intragastrically daily to the SHRs of the experimental group (n = 5) for 6 weeks. The WKY control animals (n = 5) and the SHRs (n = 5) received an equivolume amount of distilled water. Systolic blood pressure (SBP) was measured before and after the course of IQ-1S. At the end of the IQ-1S course, body mass (BM) and left ventricular mass (LVM) were evaluated, and contractile myocardial activity (intracardiac sensor) was recorded. Results. Before and after the IQ-1S course, the values of SBP in the control SHRs were higher than in WKY rats by 30 % and 53 %. After the administration of IQ-1S SHRs showed significantly lower SBP (by 13 %), the LVM/BM index (by 5 %) and the end-diastolic LV pressure (by 40 %) compared to the control SHRs. Conclusions. Our results confirm the ability of the JNK inhibitor IQ-1S to reduce blood pressure, myocardial hypertrophy and suppress the development of diastolic LV dysfunction in SHRs with the stable HTN.