THE EFFECT OF PYRIMIDINE AND CAVINTON DERIVATIVES ON THE CHANGE BIOELECTRIC POTENTIAL IN THE CONDITIONS OF FOCAL CEREBRAL ISCHEMIA OF THE RAT BRAIN

Abstract

Acute disorders of cerebral hemodynamics lead to the development of socially and demographically significant diseases, as a result of which they are one of the main health problems requiring a rational pharmacological approach. In the pathogenesis of pathologies of cerebral circulation, in addition to a decrease in blood flow, an important role is played by a violation of the bioelectric activity of brain tissues, which is evidenced by changes in the frequency and amplitude of oscillations on the encephalogram. Pyrimidine derivatives have proven themselves as potential cerebroprotectors, as a result of which we considered them as means capable of correcting electroencephalogram disorders in ischemic brain tissues. In this regard, the purpose of this work was to study the effect of pyrimidine and cavinton derivatives on the change in bioelectric potential under conditions of focal central ischemia in rats. Materials and methods. The study was conducted on 40 male rats of the Wistar line (m = 220–220 g). Focal cerebral ischemia of rats was reproduced by occlusion of the left middle cerebral artery. The animals were divided into 4 equal groups, all groups, except the first, were simulated pathology under chloral hydrate anesthesia (350 mg/kg). The first group – falsely operated rats, the second – individuals of negative control. The reference drug cavinton (3.2 mg/kg) and the pi-rimidine derivative PIR-10 (50 mg/kg) were administered to the third and fourth groups within 3 days after surgery. The electrical activity of the rat brain (delta-, theta-, alpha-, high-frequency beta-range in the frontal and parietal lobes of the left hemisphere) was evaluated after 3 days by electroencephalography (EEG) using the Neuron-Spectrum 1 encephalograph (Neurosoft, Russia). Statistical processing was carried out using the STATISTICA 8.0 application software package (StatSoft, Inc., USA). Results of the study. In the rats of the negative control group, there was a marked deterioration in bioelectric potential, which was noted in an increase in theta and delta rhythms and a decrease in alpha and high-frequency beta rhythms. The introduction of the compound PIR-10 to animals contributed to a decrease in delta rhythm by 39,8% (p < 0,05) (FP1-A1) and 56,3% (p < 0,05) (C3-A1), theta rhythm – by 23,9% (p < 0,05) (FP1-A1) and 39,4% (p < 0,05) (C3-A1), the amplitude of the alpha rhythm increased by 75,3% (p < 0,05) (C3-A1), the high-frequency beta rhythm by 25,9% (p<0,05) (FP1-A1) and 41,4% (p < 0,05) (C3-A1). Findings. The experimental derivative of pyrimidine PIR-10, equally with cavinton, contributed to the restoration of bioelectric rhythm in the form of a decrease in the amplitude of delta and theta rhythms and an increase in the amplitude of alpha and high-frequency beta rhythms in the frontal and parietal regions of the left hemisphere of the rat brain.