[ Diabetes Type 1 ]

Hepatic and peripheral insulin resistance: a common feature of type 2 (non-insulin-dependent) and type 1

We determined the population-based prevalence of diabetes mellitus in members of the Japanese community, Hisayama aged 40-79 years old by a 75-g oral glucose tolerance test. This disease has assumed frightening proportions due to unhealthy food habits and sedentary life style. In the rats which received 50.0 mg/kg or more streptozotocin, overt hyperglycaemia gradually and consistently developed following incomplete recovery from an initial hyperglycaemia. Pentosidine increased exponentially in skin but curvilinearly in glomerular basement membranes, and reached 75 and 50 pmol/mg collagen at projected 100 years, respectively. These figures were much higher than those previously reported from several Japanese communities. Levels of ICAM were not increased in our patients. We have observed that the frequency of TT genotype is significantly higher in healthy controls compared to patients (14% vs.

Total glucose uptake was reduced in both the Type 2 (4.57 +/- 0.31 versus 6.39 +/- 0.25 mg . The difference in diabetes incidence therefore cannot be attributed to any methodological error. controls). These data indicate that duration of obesity is a risk factor for type 2 diabetes, and emphasize the importance of preventing obesity in young subjects. Succinate ester derivatives represent a potential novel approach to improving beta-cell function through enhancement of insulin biosynthesis and secretion. Insulin-stimulated glucose clearance was reduced to a similar extent in Type 2 (54%) and Type 1 (61%) diabetic subjects, and correlated directly with fasting glucose clearance. These results show that insulin resistance is a common feature of both types of diabetes and can be demonstrated in the basal as well as the insulin-stimulated state.

Both hepatic and peripheral resistance to the action of insulin contribute to diabetic hyperglycaemia.

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