ИНТЕНСИВНОСТЬ СВОБОДНО-РАДИКАЛЬНЫХ ПРОЦЕССОВ И СТРУКТУРНО-ДИНАМИЧЕСКИЕ ПА-РАМЕТРЫ МЕМБРАН ЭРИТРОЦИТОВ БОЛЬНЫХ САХАРНЫМ ДИАБЕТОМ 2 ТИПА

Abstract

The World Health Organization has recognized diabetes mellitus (DM) as one of the four major noncommunicable diseases that lead to early disability and mortality among the population. Oxidative stress, which contributes to the intensification of free radical processes (FRP), can be considered as a universal nonspecific mechanism of DM2 pathogenesis. De-spite numerous studies, questions about the mechanisms of development of oxidative stress and its influence on the physicochemical state of biological membranes still remain open. The aim of this work is to study the intensity of free radical processes and the structural and dynamic characteristics of blood erythrocyte membranes in patients with type 2 diabetes mellitus (DM2). The study included male patients with type 2 diabetes aged 55 to 70 years who did not have other acute and chronic diseases in the acute stage. The content of glucose, glycated hemoglobin, markers of oxidative stress (MDA and carbonyl groups) was determined in the blood of patients. The structural and dynamic parameters of erythrocyte membranes were determined using fluorescent probe pyrene. It was found that an increase in blood glucose levels in patients with DM2 increases the content of markers of lipid peroxidation (MDA) and oxidative modification of proteins (carbonyl groups). Oxidative damage to lipids and proteins of erythrocyte membranes in decompensated DM2 changes their structural and dynamic properties: they increase the microviscosity of the lipid bilayer and the polarity of its phospholipids, and promote conformational rearrangements in membrane proteins. Close correlations were found between the level of glucose, the content of CRP products in the blood, and the structural and dynamic parameters of erythrocyte membrane