[ Nutrition ]

Acute hyperglycemia and hyperinsulinemia enhance vasodilatation in Type 1 diabetes mellitus without increasing capillary permeability


Impaired fasting glucose (IFG) and/or impaired glucose tolerance (IGT) are considered to constitute “pre-diabetes.” We estimated the prevalence of IFG, IGT, and pre-diabetes among U.S. We investigated the effects of systemic instead of portal insulin release in type 1 diabetic patients after successful pancreas-kidney transplantation (PKT) with systemic venous drainage on the intracellular lipid content in liver and soleus muscle, endogenous glucose production (EGP), and insulin sensitivity. Their receptor had an intact tyrosine kinase activity but a higher Km for ATP in the phosphorylation reaction of exogenous substrates. The thrifty genotype hypothesis provides a plausible basis for a better understanding of how hyperinsulinemia and insulin resistance could lead to glucose intolerance and atherosclerotic cardiovascular disease, but the detailed biochemical mechanisms remain elusive. After stabilization under fixed metabolic diet, subjects underwent hyperinsulinemic-euglycemic clamp. The insulin response to glucose was blunted in all pancreatectomized and in 2 conservatively treated patients. Each subject was clamped at both the “normal” and “obese” OGTT insulin profiles.

Importantly, using wild-type Kir6.2, a 30-s preconditioning exposure to physiological MgATP concentrations (>300 µmol/L) caused a marked reduction in the ATP sensitivity of neonatal diabetic channels, a small decrease in that of wild-type channels, and no change for E1506K channels. In conclusion, fasting hyperinsulinemia may be a risk factor for the development of obesity in young children. “There are a number of strategies that could improve insulin resistance, ranging from traditional diet and exercise to insulin sensitizers.” Arch Neurol 2005;62:1-6. The acute hyperglycemia- and hyperinsulinemia-induced vasodilatation is not accompanied by changes in microvascular permeability or endothelial markers.

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