THE COMPARATIVE ANALYSIS OF THE ULTRASTRUCTURAL REACTION OF NEO- AND PALLEOCORTEX OF BRAIN ON ACUTE CEREBRAL DISORDER IN BASSIN OF CAROTID ARTERIES ON BACKGROUND OF DIABETIC ENCEPHALOPATHY IN RATS

Abstract

The aim of the study. The objective is to perform the comparativ analysis the ultrastructural reactions of tissues of neocortex and fields of hippocampus in rats with diabetic encephalopathy to acute cerebrovascular disorder in the bassin of carotid arteries. Material and methods. Diabetes mellitus was modeled by single intraperitoneal administration of the streptozotocin (Sigma, Aldrich, 60 mg / kg) to white nonlinear male rats in age two months, and acute cerebrovascular disorder was performed by a 20-minute clipsing of both common carotid arteries under intraperitoneal anesthesia, with reperfusion for 1 hour. The fragments of the brain containing the hippocampus and the cortex of the frontal and occipital brain lobes were taken, and after appropriate fixation and wiring, ultrathin sections were made, which were stained with 1% aqueous uranyl acetate solution, contrasted by lead citrate and studied using an electron microscope PEM-125K. Results. The diabetic encephalopathy in rats exacerbates destructive changes of all structural components of the gray matter of the cortex of the investigated brain lobes and the fields of the hippocampus in the form of violations of the internal structure and shape of the nerve cells and the appearance of neurocytes with hypo and hyperchromia of neuro-and karyoplasma in varying degrees of severity, violation of the structure of cellular organelles and decrease their number, appearance of perivascular edema, that is caused by ischemia-reperfusion of the brain. Among the all studied structures, the field of the hippocampus CA3 is the least sensitive to the indicated intervention. Conclusions. Diabetic encephalopathy creates pathomorphological preconditions for the deteriorated course of ischemic-reperfusion injury of the brain, especially in the structures of the neocortex and the fields of the hippocampus CA1 and CA2.