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Insulin receptor gene in hypertension
1Department of Physiology, University of Sydney, NSW, Australia.
Summary
The insulin receptor gene (INSR) is linked to essential hypertension (HT). Genetic variations in INSR may contribute to HT development in some individuals, potentially through insulin resistance mechanisms.
Area of Science:
- Genetics
- Endocrinology
- Cardiovascular Disease
Background:
- Essential hypertension (HT) is a complex cardiovascular disease.
- The insulin receptor gene (INSR) was the first gene identified with a molecular genetic association with HT.
- Insulin resistance is increasingly recognized as a factor in HT pathogenesis.
Purpose of the Study:
- To review the genetic associations of the insulin receptor gene (INSR) with essential hypertension (HT).
- To explore the potential role of INSR dysregulation in the etiology of HT.
Main Methods:
- Review of genetic association studies of INSR variants with HT across different ethnicities.
- Examination of the physiological links between insulin signaling, insulin resistance, and cardiovascular factors like angiotensinogen and renin.
Main Results:
- A significant association between an INSR insertion/deletion polymorphism in intron 9 and HT was found in Caucasians.
- INSR variants have shown associations with HT in Chinese populations and with plasma insulin in Japanese populations.
- Evidence in spontaneously hypertensive rats suggests INSR dysregulation may be linked to NaCl-loading responses.
Conclusions:
- Dysregulation of the insulin receptor gene (INSR) warrants attention as a potential contributor to essential hypertension (HT) in a subset of patients.
- Insulin resistance, possibly linked to INSR defects, could promote HT through increased insulin, angiotensinogen, and renin secretion.
- The findings support further investigation into INSR's role in the multifactorial etiology of essential hypertension.