Related Experiment Videos
Hypertension, insulin, and atherogenesis
1MRC Blood Pressure Unit, Western Infirmary, Glasgow, Scotland.
Journal of Cardiovascular Pharmacology
|January 1, 1991
Summary
Essential hypertension and non-insulin-dependent diabetes mellitus are linked to hyperinsulinemia, potentially driving atherosclerosis. This study found no evidence of abnormal regulation of the inhibitory guanine nucleotide binding protein Gi in hypertension, suggesting other insulin actions may contribute to disease.
Area of Science:
- Cardiovascular Science
- Endocrinology
- Metabolic Syndrome
Background:
- Essential hypertension and non-insulin-dependent diabetes mellitus share hyperinsulinemia, a potential contributor to atherogenesis.
- The precise role of hyperinsulinemia or insulin resistance in hypertension and atheroma development remains unclear.
- Insulin regulates cell function, including the expression and function of the inhibitory guanine nucleotide binding protein Gi.
Purpose of the Study:
- To investigate whether abnormal regulation of the Gi protein occurs in human hypertension or animal models.
- To determine if insulin's regulation of Gi protein is impaired in hypertensive conditions.
Main Methods:
- Analysis of platelet membranes from humans with hypertension.
- Examination of rat tissue membranes (myocardium, vasculature) from hypertensive models.
- Assessment of Gi protein levels and function in these membranes.
Main Results:
- No alterations in Gi protein levels or function were detected in human or rat hypertensive models.
- The study found no evidence of abnormal insulin action on Gi protein regulation in hypertension.
Conclusions:
- The investigated aspect of insulin's action on cell function (Gi protein regulation) appears normal in hypertension.
- Unimpaired growth-regulatory actions of insulin, despite impaired glucose uptake, may drive vascular smooth muscle cell growth and contribute to atheroma development.