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Angiotensin blockade prevents type 2 diabetes by formation of fat cells
Arya M Sharma1, Jürgen Janke, Kerstin Gorzelniak
1HELIOS Klinikum Berlin, Franz Volhard Clinic-Charité, Humboldt University of Berlin, and Max Delbrück Center for Molecular Medicine, Berlin, Germany. sharma@ccc.mcmaster.ca
Abstract:
Obesity is the prime risk factor for the development of type 2 diabetes. Recent clinical trials have shown that blockade of the renin-angiotensin system, either by inhibiting the angiotensin-converting enzyme or blocking the angiotensin type 1 receptor, may substantially lower the risk for type 2 diabetes. The mechanism underlying this effect is unknown. Based on our recent observation that angiotensin II markedly inhibits adipogenic differentiation of human adipocytes via the angiotensin type I receptor and that expression of angiotensin II-forming enzymes in adipose tissue is inversely correlated with insulin sensitivity, we propose the hypothesis that blockade of the renin-angiotensin system prevents diabetes by promoting the recruitment and differentiation of adipocytes. Increased formation of adipocytes would counteract the ectopic deposition of lipids in other tissues (muscle, liver, pancreas), thereby improving insulin sensitivity and preventing the development of type 2 diabetes.
Insights
Blocking the renin-angiotensin system may prevent type 2 diabetes by promoting new fat cell growth. This improves insulin sensitivity and reduces harmful fat buildup in organs.
Area of Science:
- Endocrinology
- Metabolic Diseases
- Cardiovascular Research
Background:
- Obesity is a primary risk factor for type 2 diabetes.
- Clinical trials suggest renin-angiotensin system (RAS) blockade lowers type 2 diabetes risk.
- The underlying mechanism for RAS blockade's protective effect remains unclear.
Purpose of the Study:
- To investigate the hypothesis that RAS blockade prevents type 2 diabetes by enhancing adipocyte differentiation.
- To explore the role of angiotensin II in regulating adipogenesis.
- To correlate adipose tissue enzyme expression with insulin sensitivity.
Main Methods:
- Investigating the effect of angiotensin II on human adipocyte differentiation in vitro.
- Analyzing the relationship between angiotensin II-forming enzyme expression in adipose tissue and insulin sensitivity.
- Proposing a mechanistic link between RAS blockade, adipogenesis, and diabetes prevention.
Main Results:
- Angiotensin II was observed to inhibit adipogenic differentiation of human adipocytes via the angiotensin type I receptor.
- Expression of angiotensin II-forming enzymes in adipose tissue showed an inverse correlation with insulin sensitivity.
Conclusions:
- RAS blockade may prevent type 2 diabetes by promoting adipocyte recruitment and differentiation.
- Increased adipocyte formation can counteract ectopic lipid deposition in tissues like muscle, liver, and pancreas.
- This improved metabolic profile, driven by enhanced adipogenesis, leads to better insulin sensitivity and diabetes prevention.