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      Increase in Resting Levels of Superoxide Anion in the Whole Blood of Uremic Patients on Chronic Hemodialysis

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      Blood Purification

      S. Karger AG

      Superoxide anion, Uremia, Lucigenin, Chemiluminescence, Hemodialysis

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          Recently, we developed a new method to measure the resting level of superoxide anion in whole blood using an ultrasensitive chemiluminescence analyzer and lucigenin amplification. The advantage of this method is that the assay system can be performed in the absence of leukocyte isolation and stimulant administration. In this study, we applied this method to measure the blood resting levels of superoxide anion in 104 uremic patients on chronic hemodialysis (CHD) and 98 sex- and age-matched healthy controls to clarify the influence of HD on blood levels of superoxide anion. Simultaneously, the plasma levels of copper, zinc superoxide dismutase (Cu,Zn-SOD), glutathion peroxidase (GPX), myeloperoxidase (MPO) and lactoferrin (Lacto-F) were measured. The results showed that the basal blood levels of superoxide anion, Cu,Zn-SOD, and MPO in CHD patients were significantly greater than those of healthy controls. However, there was no difference in the basal plasma levels of Lacto-F and GPX between CHD patients and healthy controls. One session of HD further increased the blood levels of superoxide anion, MPO, Lacto-F and Cu,Zn-SOD but not GPX. These results suggest that the blood levels of superoxide anion are higher in CHD patients and further increase after one session of HD. This mechanism should be studied further.

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          Decreased total antioxidant capacity but normal lipid hydroperoxide concentrations in sera of critically ill patients.

          Oxidative stress (when free radical generation exceeds antioxidant defense) occurs in many human diseases and makes significant contributions to their pathogenesis. We automated assays estimating the antioxidant status of serum, and lipid hydroperoxide concentrations using the Monarch analyzer. In this assay, the antioxidant status of serum is measured by its ability to inhibit generation of free radicals from 2,2'-amino-di-[3-ethylbenzthiazole sulphonate] by metmyoglobin and hydrogen peroxide. The assay for measuring lipid peroxidation products in serum utilizes the ability of lipid hydroperoxides to generate methylene blue from 10N-methylcarbamyl 3,7-dimethylamino 10H-phenothiazine. We detected no lipid hydroperoxide in sera obtained from 24 controls. The mean antioxidant status was 1.69 mmol/l (SD; 0.20 mmol/l) in controls. The antioxidant capacity of serum was significantly reduced in sera of critically ill patients in the medical intensive care unit (mean = 1.05, SD = 0.26 mmol/l) with p value less than 0.05 by independent t-test, two tailed. Lipid peroxidation products were not significantly elevated in critically ill patients, however lipid peroxidation products were significantly elevated in hemodialysis patients (mean = 1.40, SD = 0.47 mumol/l) and in some kidney transplant recipients. We conclude that antioxidant capacity of sera in critically ill patients is significantly reduced.
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            Quantitative and qualitative changes of extracellular-superoxide dismutase in patients with various diseases

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              Chemiluminescence of whole blood


                Author and article information

                Blood Purif
                Blood Purification
                S. Karger AG
                October 1998
                29 January 1999
                : 16
                : 5
                : 290-300
                Free Radical Research Center, Formosan Blood Purification Foundation, Taipei, Taiwan
                14347 Blood Purif 1998;16:290–300
                © 1998 S. Karger AG, Basel

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                Page count
                Figures: 6, Tables: 3, References: 33, Pages: 11
                Self URI (application/pdf): https://www.karger.com/Article/Pdf/14347
                Original Paper

                Cardiovascular Medicine, Nephrology

                Superoxide anion, Uremia, Hemodialysis, Lucigenin, Chemiluminescence


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