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Pathogenesis of type 2 diabetes mellitus: an interpretation of current data
Abstract:
The available evidence concerning the pathogenesis of type 2 diabetes mellitus suggests that although insulin antagonism is common to many patient groups (i.e., obese, older), overt NIDDM will only develop in a subset who may have a genetic susceptibility for inadequate beta-cell reserves. Since the role of a receptor defect in causing type 2 diabetes is doubtful, the insulin antagonism in these patients is due to a post-receptor defect.
Insights
Type 2 diabetes mellitus develops in susceptible individuals due to post-receptor insulin resistance, not receptor defects. Genetic factors and inadequate beta-cell reserves play crucial roles in disease pathogenesis.
Area of Science:
- Endocrinology
- Metabolic Diseases
- Genetics
Background:
- Type 2 diabetes mellitus (T2DM) pathogenesis involves insulin antagonism, common in obese and older populations.
- Overt non-insulin-dependent diabetes mellitus (NIDDM) develops in a subset with genetic susceptibility and insufficient beta-cell reserves.
Purpose of the Study:
- To elucidate the underlying mechanisms of insulin antagonism in T2DM.
- To differentiate between receptor and post-receptor defects in T2DM pathogenesis.
Main Methods:
- Review of available evidence on T2DM pathogenesis.
- Analysis of factors contributing to insulin resistance.
Main Results:
- Insulin antagonism is a common feature in various patient groups.
- A post-receptor defect, not a receptor defect, is identified as the cause of insulin antagonism in T2DM.
- Genetic susceptibility and inadequate beta-cell function are critical for overt NIDDM development.
Conclusions:
- The primary defect in insulin antagonism in T2DM is post-receptor.
- Genetic predisposition is a key factor in the development of T2DM in susceptible individuals.