OXIDATIVE STRESS AND RESISTANCE OF ERYTHROCYTES MEMBRANES IN PATIENTS WITH CHRONIC KIDNEY DISEASE STAGE VD DEPENDING ON MODALITY OF RENAL REPLACEMENT THERAPY

Abstract

The aim of the research was to study the effect ofoxidative factors impact and modality of renal replacement therapy (BBT) on indices ofoxidative stress (OS) and resistance of erythrocytes membranes in patients with chronic kidney disease stage V(CKD VD) and anemie. Material and methods. The study involved 68 patients with CKD VD: 14 patients were treated by hemodiafiltration (HDF), 25 patients by hemodialysis (HD) and 29 patients by peritoneal dialysis (PD). The severity ofanemia was assessed according to the KDIGO (2012) criteria. The control group consisted of 30 healthy people of the same age and sex. Along with the standard diagnostic methods, we defined the content of malonic dialdehyde in serum (MDAs) and in erythrocytes (MDAe), the content of ceruloplasmin (CPs), transferrin (TBs) and SH-groups in the blood serum, the index of the OS (IOS), catalase activity in serum (CATs), glucose-6-phosphate dehydrogenase (G-6-PDHe) and total peroxidase activity (TPA) in erythrocyte, peroxide resistance (PR) of red blood cells and erythrocyte membrane permeability (EMP). Statistical analysis was performed using the programs of Microsoft Excel 7.0. Results. It has been stated that in the CKD VD patients in compatison with control group the MDAs content increased by 3.3 times and MDAe - 1.2 times, TBs content reduced by 34%, SH-groups - by 31%, TPAe - by 41% and G- 6-FDGe - by 58%, PB-by 60%; 4.6 times increased CATs activity and OSI; 2 times grew peroxide hemolysis (PH) and 1.3 times - EMP. The analysis (depending on the BBT modality) showed that the patients treated by HDF had typical MDAs increase by 3.9 times on a background of CPs by 24%, TBs - 33%, SH-groups - 25%, TPAe - 51%, G-6-PDHe - 42%; the increase in serum OSI - 5.4 times and 2.6 times in erythrocytes, PB - by 3.6 times and CATs activity by 3.5 times; HD group was characterized by the highest value of MDAe, OSI, PH and CATs, along with more expressed decrease of TBs indices, SH-groups, TPA and G-6-FDHe activity compared with rates in patients with HDF. The patients treated with PD had the lowest content of MDAs and the highest values on the background ofTPAe, the significant increase of CPs by 1.7 times and lowest TBs and G-6-PDHe. The patients with PD showed twice lower OS activity by OSI. Conclusion. Thus, in patients with CKD VD, who had HD, HDF or PD an anemie was associated with high OS activity and the increased degree of hemolysis. These changes are stipulated by BBT methods: for patients receiving HDF were typical the lowest rates of hemolysis and the highest degree ofprotection for erythrocytes, and for patients treated with HD - the highest OS.

Keywords

• chronic kidney disease, oxidative stress, resistance of erythrocytes membranes, renal replacement therapy