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  • Articles: DFG German National Licenses  (2)
  • 3-hydroxybutyrate  (1)
  • Human umbilical vein endothelial cells  (1)
  • 1
    ISSN: 1432-0428
    Keywords: Ketone bodies ; acetoacetate ; 3-hydroxybutyrate ; Types 1 and 2 diabetes ; ketosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Serum levels of acetoacetate, 3-hydroxybutyrate and the 3-hydroxybutyrate/acetoacetate ratio were determined in Type 1 (insulin-dependent) and Type 2 (non-insulin-dependent) diabetic patients by a new sensitive method. Efforts were made to differentiate Type 1 and Type 2 diabetes by serum levels of ketone bodies and to determine whether their measurement is a useful way of monitoring diabetic control. In Type 2 diabetes, serum levels of total ketone bodies did not exceed 2.0 mmol/l even if the patients were untreated or poorly controlled. In Type 1 diabetic subjects, treated with once or twice daily injections of insulin, morning serum levels of acetoacetate, 3-hydroxybutyrate and total ketone bodies were significantly elevated by four-, ten- and sevenfold, respectively. In Type 2 diabetic subjects treated with diet or sulphonylureas, serum levels of 3-hydroxybutyrate were highest before breakfast, next highest before dinner and decreased after each meal. The changes were roughly inversely proportional to serum insulin levels. In addition, insulin treatment normalized fasting serum levels of ketone bodies better than diet or sulphonylurea treatment. Acetoacetate was also significantly increased in both types of diabetes to a lesser extent, but no apparent diurnal rhythm was observed. Determination of serum levels of ketone bodies is useful for the diagnosis of Type 1 diabetes (those with total ketone bodies 〉 2 mmol/l) and for detecting insufficient insulin therapy.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0428
    Keywords: Human umbilical vein endothelial cells ; high glucose ; oxygen radicals ; radical scavenger ; glutathione redox cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To determine whether increased oxidative stress in diabetes mellitus is due to an impaired freeradical scavenger function in endothelial cells, GSH-dependent H2O2 degradation in human umbilical vein endothelial cells was studied. The GSH-dependent, NaN3-uninhibitable H2O2-degradation in endothelial cells was reduced by 48% (p 〈0.001) when the cells were exposed to 33 mmol/l d-glucose vs 5.5 mmol/l d-glucose. This impairment was dependent not only on the d-glucose concentration in the medium but also on d-glucose specific metabolism, since neither 27.5 mmol/l l-glucose nor 27.5 mmol/l d-raffinose had any effect on the peroxide degradation activity. Activation of the glutathione redox cycle by H2O2 in cells exposed to high glucose concentrations was attenuated as compared with 5.5 mmol/l d-glucose because of: 1) a 42% decrease (p 〈0.001) in intracellular NADPH content, and 2) a 34% reduction (p 〈0.01) in glutathione release into the media. This results in an accumulation of GSSG in the cells following exposure to H2O2. Both H2O2-evoked 51Cr-release and H2O2-induced endothelial cell damage were significantly (p 〈0.01) greater in the 33 mmol/l d-glucose group than in the 5.5 mmol/l d-glucose group. These results indicate that the abnormal glutathione redox cycle observed in endothelial cells is induced by high glucose concentrations in the medium, resulting in an impairment of reduced GSH-dependent H2O2-degradation. These abnormalities may associate with the increased cellular damage following an exogenous exposure to H2O2.
    Type of Medium: Electronic Resource
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