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Articles by A. Kautzky-Willer
Total Records ( 2 ) for A. Kautzky-Willer
  A. Mari , A. Tura , G. Pacini , A. Kautzky-Willer and E. Ferrannini
 

Aims Acute insulin release (AIR) in response to intravenous glucose injection (IVGTT) can be abolished in diabetic subjects when their response to oral glucose is maintained. To elucidate this phenomenon, we examined the relationships between fasting plasma glucose (FPG) and the secretory responses to an IVGTT and an oral glucose test (OGTT).

Methods We measured AIR and secretion after a 75-g OGTT in 221 subjects [age 37±11years, body mass index (BMI) 28±5kg/m2; mean± SD] with normal glucose tolerance (NGT, n=147), impaired FPG/impaired glucose tolerance (IFG/IGT, n=28) and Type 2 diabetes (n=46). Insulin secretion was calculated by C-peptide deconvolution; pancreatic B-cell glucose sensitivity was obtained by OGTT modelling.

Results Both AIR [186 (185), 142 (164) and 10 (16)pmol/l, median (interquartile range)] and B-cell glucose sensitivity [98 (64), 66 (53) and 16 (20)pmol min−1 m−2 l mmol−1] decreased across glucose tolerance category (P<0.0001). However, AIR became ~0 at ~7mmol/l FPG, whereas B-cell glucose sensitivity declined gradually throughout the FPG range. In addition, for FPG >7mmol/l, AIR was no longer related to FPG, whereas a strong relationship between FPG and B-cell glucose sensitivity was preserved (?=−0.71, P<0.0001). In a multivariate regression model, adjusting for sex, age and BMI, glucose sensitivity [standardized regression coefficient (std.r.)=−0.67, P<0.0001], but not AIR (std.r.=0.03, P=0.55), was an independent predictor of FPG.

Conclusions AIR vanishes at fasting or 2-h glucose levels, at which levels some B-cell glucose sensitivity is retained; therefore, AIR has a limited ability to quantify B-cell function in hyperglycaemic states.

  A. Tura , G. Pacini , Y. Winhofer , L. Bozkurt , G. Di Benedetto , U. Morbiducci , M. Roden and A. Kautzky-Willer
  Aims  Women with former gestational diabetes are at increased risk of Type 2 diabetes, which likely relates to hyperlipidaemia and ectopic lipid storage, mainly in the liver. Here, we examined the response of non-esterified fatty acid dynamics to oral glucose loading (oral glucose tolerance test).

Methods  We studied women with former gestational diabetes with normal glucose tolerance (n = 60) or impaired glucose metabolism (n = 12) and compared them with healthy women after normal pregnancy (control subjects, n = 15). During a 3-h oral glucose tolerance test, glucose, insulin and non-esterified fatty acid were frequently measured to compute the area under the non-esterified fatty acid curve and parameters of β-cell function and insulin sensitivity. Through mathematical modelling, we assessed insulin sensitivity of lipolysis inhibition and the fractional non-esterified fatty acid turnover rate. We also measured some serum liver enzymes.

Results  Women with former gestational diabetes were slightly older and had greater body mass than control subjects. Subjects with impaired glucose metabolism had lower oral glucose insulin sensitivity, but higher fasting insulin and area under the non-esterified fatty acid curve, which inversely related to oral glucose insulin sensitivity and independently determined mean glycaemia. Model-derived non-esterified fatty acid parameters were lower in subjects with impaired glucose metabolism than in control subjects, particularly sensitivity of non-esterified fatty acid inhibition to insulin (2.50 ± 0.52 vs. 1.06 ± 0.20.10−2 ml/μU). Also, subjects with impaired glucose metabolism had higher liver transaminases. However, all non-esterified fatty acid parameters showed only modest inverse correlation with liver transaminases.

Conclusions  Despite greater insulinaemia, circulating non-esterified fatty acids are higher in women with former gestational diabetes than in control subjects, which likely results from reduced sensitivity of lipolysis inhibition to insulin. This parameter may serve as indicator of an early metabolic derangement in this population at risk for diabetes.

 
 
 
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