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[Impairments of insulin receptor function in insulin resistant states]
13rd Dept. of Medicine, Shiga University of Medical Science.
Abstract:
Type 2 diabetes is characterized by insulin resistance in skeletal muscle. Since the molecular mechanism of insulin resistance is still unknown, insulin receptor dysfunction including abnormal IRS-1 phosphorylation is considered to be responsible for insulin resistance in some pathological states. Obesity is one of major factors to induce insulin receptor dysfunction. Regarding the mechanism of insulin resistance related obesity, the increased expression of Tumor necrosis factor alpha and abnormality in PTPase in skeletal muscle are postulated. As well as obesity, prolonged hyperglycemia, dyslipidemia and hypertension also induce the impairment of insulin receptor function. Therefore, the enhancement of insulin sensitivity by modulating these factors is a possible treatment modality in insulin resistant states.
Insights
Type 2 diabetes involves insulin resistance in muscle, potentially due to insulin receptor issues. Addressing factors like obesity and high blood sugar may improve insulin sensitivity and treat resistance.
Area of Science:
- Endocrinology and Metabolism
- Molecular Biology
Context:
- Type 2 diabetes is a prevalent metabolic disorder.
- Insulin resistance in skeletal muscle is a hallmark of type 2 diabetes.
- The precise molecular mechanisms underlying insulin resistance are not fully understood.
Purpose:
- To explore the molecular mechanisms of insulin resistance in type 2 diabetes.
- To investigate the role of insulin receptor dysfunction and associated factors.
Summary:
- Insulin resistance in skeletal muscle, a key feature of type 2 diabetes, may stem from insulin receptor dysfunction, including abnormal IRS-1 phosphorylation.
- Obesity, prolonged hyperglycemia, dyslipidemia, and hypertension can impair insulin receptor function.
- Increased Tumor Necrosis Factor alpha and PTPase abnormalities in skeletal muscle are implicated in obesity-related insulin resistance.
Impact:
- Understanding these mechanisms can lead to novel therapeutic strategies for type 2 diabetes.
- Modulating factors contributing to insulin resistance may enhance insulin sensitivity.
- This research highlights potential treatment targets for insulin-resistant states.