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  • 1
    ISSN: 1432-0428
    Keywords: Keywords Leptin ; insulin ; body fat ; non-insulin-dependent diabetes mellitus ; renal function.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Plasma leptin level is known to correlate with the degree of obesity. To determine the influences of renal fuction and insulin resistance on plasma leptin concentrations, we measured plasma leptin concentrations and performed the euglycaemic hyperinsulinaemic clamp studies in 57 patients with non-insulin-dependent diabetes mellitus with a wide range of renal function. In simple regression analyses, plasma leptin concentration showed significant positive correlations with percentage of body fat measured by dual energy X-ray absorptiometry, body mass index, waist to hip ratio and fasting plasma insulin. Leptin level was higher in females than males. Multiple regression analyses indicated that percent body fat, waist to hip ratio, plasma insulin, gender and renal function (1/creatinine), but not insulin sensitivity, were significant and independent determinants of plasma leptin level. These results suggest that plasma leptin level is regulated or affected by multiple factors including renal function. Insulin resistance appeared to increase leptin levels indirectly by raising plasma insulin. [Diabetologia (1997) 40: 676–679]
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 30 (1987), S. 426-430 
    ISSN: 1432-0428
    Keywords: Glucose transport ; insulin ; 3-O-methylglucose ; fructose ; adipocytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The kinetics of 3-O-methyl-D-glucose and D-glucose transport was reinvestigated at 37 °C in rat adipocytes exhibiting very slow transport rates in the absence of insulin and approximately 30-fold insulin stimulation. The apparent maximal velocity for 3-O-methylglucose was increased at least 15-fold from 0.04±0.01 to 0.73±0.17 mmol ·1−1·s−1 (SD, n=7). The apparent half saturation constant was decreased by insulin from 8.1±1.6 mmol/l to 3.3±0.8 mmol/l. However, approximately 10% of the 3-O-methylglucose at a very low concentration was transferred by routes other than the glucose transporter, e. g. via nonmediated diffusion or via the fructose transporter, and the estimated value for the half saturation constant was therefore too high in the nonstimulated cells. After appropriate correction this value was estimated as 5.0±1.8 mmol/l. The inhibition constant of 3-O-methylglucose on the conversion of 12 μmol/l 14C-labelled glucose to cell-associated products was about 4 mmol/l and was not changed significantly by insulin. Transport experiments with labelled glucose gave results similar to those obtained for transport of 3-O-methylglucose. It is concluded that insulin can cause a 15- to 30-fold increase in the maximal velocity for transport of 3-O-methylglucose and glucose, and that a concomitant decrease in the half saturation constant, if present, is insignificant.
    Type of Medium: Electronic Resource
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