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      Compositional and oxidative analysis in the saliva and serum of predialysis chronic kidney disease patients and end-stage renal failure patients on peritoneal dialysis.

      Therapeutic apheresis and dialysis : official peer-reviewed journal of the International Society for Apheresis, the Japanese Society for Apheresis, the Japanese Society for Dialysis Therapy
      Adult, Aged, Aged, 80 and over, Albumins, metabolism, Antioxidants, analysis, Blood Proteins, Female, Humans, Kidney Failure, Chronic, physiopathology, L-Lactate Dehydrogenase, Male, Middle Aged, Oxidative Stress, Peritoneal Dialysis, Continuous Ambulatory, adverse effects, Peroxidase, Saliva, chemistry, Salivary Proteins and Peptides, Superoxide Dismutase, Uric Acid

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          Abstract

          Chronic renal failure (CRF) is often treated with peritoneal dialysis, although increased oxidative stress has been reported in such patients. The purpose of the current study was to analyze and compare oxidative stress and other compositional parameters in the saliva, serum and peritoneal dialytic fluid (PDF) of patients with chronic kidney disease (CKD), including predialysis CKD patients and end-stage renal disease (ESRD) patients treated with peritoneal dialysis. Twenty-three consenting patients participated in the current study. Saliva and serum samples collected from both groups and PDF from the dialysis patients were all examined for uric acid (UA), total antioxidant status, total protein and total albumin. The antioxidant enzyme peroxidase was examined both in saliva and serum, while the antioxidant enzyme superoxide dismutase (SOD) was examined solely in saliva. Various electrolytes were examined. Discrepancies were found between saliva and serum antioxidant status following peritoneal dialysis in ESRD patients. Oxidative stress was enhanced in the saliva but reduced in the serum. Significant changes in both oxidative-related and non-related parameters were demonstrated in saliva, serum and PDF. Salivary lactate dehydrogenase was substantially lower in the dialysis patients (by 92%, P = 0.02), as was the salivary UA concentration (by 22%, P = 0.05) and serum UA concentration (by 20%, P = 0.03). In contrast, salivary peroxidase and SOD were higher by 15% and 35%, respectively (P = 0.01), in these patients. We suggest monitoring salivary UA for assessing the baseline oral oxidative status of CRF and dialyzed patients.

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