Related Experiment Videos
Deranged insulin-secretory dynamics in offspring of two diabetic parents after double stimulation with intravenous
Insights
This study reveals subtle insulin secretion defects in individuals with a family history of diabetes. A novel double glucose stimulation test identified early signs of impaired glucose metabolism, aiding in the detection of diabetes-prone populations.
Area of Science:
- Endocrinology
- Metabolic Research
- Diabetes Pathophysiology
Background:
- Type 2 diabetes mellitus (T2DM) has a significant genetic component.
- Early identification of individuals at risk for T2DM is crucial for timely intervention.
- Subtle defects in beta-cell function may precede overt hyperglycemia.
Purpose of the Study:
- To investigate early beta-cell dysfunction in offspring of diabetic parents.
- To evaluate the utility of a double intravenous glucose tolerance test (IVGTT) in detecting prediabetic states.
- To characterize specific patterns of insulin secretion defects.
Main Methods:
- A cohort of nine offspring from diabetic parents and 18 healthy controls underwent a modified IVGTT.
- Two intravenous glucose loads (0.5 gm/kg body weight) were administered 60 minutes apart.
- Plasma glucose and insulin levels were measured to assess beta-cell response.
Main Results:
- Prediabetic individuals exhibited an inverse relationship between insulin peak response and 60-minute postglucose insulin concentration, contrary to controls.
- Insulin peak response was delayed after both glucose pulses in the prediabetic group.
- Impaired glucose handling and reduced insulin response per unit glucose change were observed, particularly after the second glucose load.
Conclusions:
- The double IVGTT effectively amplifies subtle beta-cell secretory defects.
- This method holds promise for identifying individuals predisposed to developing diabetes.
- Early detection of these secretory anomalies can inform preventative strategies for T2DM.
Abstract:
Nine offspring of two diabetic parents and 18 normals were studied with two intravenous glucose loads (o.5 gm./kg. body weight), 60 minutes apart. By thus stressing the beta cell, subtle defects could be identified in the prediabetics: (1) An inverse relationship between insulin peak response and insulin concentration 60 minutes postglucose was seen, a phenomenon exactly the opposite to that seen in normals. (2) Insulin peak response was delayed slightly after the first pulse and significantly after the second. (3) A less effective handling of the glucose load when compared with normals was brought out by the second stimulation. (4) There was a significant reduction in the insulin response per unit change in glucose after the first glucose pulse that was accentuated after the second pulse. This double-stimulation technique amplifies previously detected slight but significant defects in insulin secretion that might help to identify a diabetes-prone population.