Evaluation of erythrocyte membrane lipids and proteins in renal disorders

Abstract

Background: Membrane lipids and proteins play a significant part in imparting membrane its rheological properties. These parameters are altered in diseased states. Exploring the conformational changes in renal disorders can widen our understanding of its impact on the circulatory system. This could lead to a new diagnostic parameter to study the progress of a disease.Methods: 120 blood samples collected from 30 kidney donors, 30 stage 3-4 Chronic kidney disease (CKD) patients (group 1) and 30 stage 5 CKD patients on dialysis (pre and post dialysis) (group 2) were lysed and washed to obtain erythrocyte ghost membranes. The proteins extracted from these membranes were estimated colorimetrically using Micro BCA kit. Phospholipids were separated and quantified using HPTLC. Fatty acids and cholesterol were analysed using GCMS.Results: The erythrocyte membrane protein profile showed lower values in group 2 participants than group 1 participants, but this difference was not significant. Distinct decreases in percentages of palmitic acid, myristic acid, stearic acid, dodecanoic acid, cholesterol, phosphatidylserine, phosphatidylcholine and phosphatidylethanolamine were observed in both groups, with the lowest values in patients undergoing dialysis. Sphingomyelin and linoleic acid did not show any such trend across groups.Conclusions: The data is suggestive of an altered membrane structure in participants undergoing dialysis patients than the control group. This could be because of uremic toxins in the circulatory system affecting the membrane lipids. Decreased levels of essential phospholipids can impact the functions and lifespan of the erythrocytes. This could be a reason behind anaemia seen in most patients with CKD

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