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Angiotensin (1-7) Improves Pancreatic Islet Function via Upregulating PDX-1 and GCK: A Dose-Dependent Study in Mice
Ziwei Lin1,2, Jiaqi Lin1,2, Anqi Huang1,2
1Shantou University Medical College, Shantou, China.
International Journal of Endocrinology
|December 30, 2024
Summary
Angiotensin (1-7) administration significantly improved glucose and lipid metabolism in db/db mice. This peptide enhanced islet function by increasing beta-cell ratios and promoting PDX-1 and GCK gene expression.
Area of Science:
- Endocrinology
- Metabolic Research
- Molecular Biology
Background:
- Type 2 diabetes is characterized by impaired insulin secretion and glucose intolerance.
- The angiotensin system plays a role in metabolic regulation, with angiotensin (1-7) showing potential therapeutic benefits.
Purpose of the Study:
- To investigate the effects of angiotensin (1-7) on islet function and glucose metabolism in a mouse model of type 2 diabetes.
- To explore the underlying signaling pathways, including PDX-1 and GCK expression, involved in angiotensin (1-7) mediated improvements.
Main Methods:
- db/db mice were treated with varying doses of angiotensin (1-7) for 8 weeks.
- Evaluated changes in body weight, food intake, lipid metabolism, and glucose tolerance.
- Assessed pancreatic islet morphology, beta-cell mass, and expression of PDX-1 and GCK.
Main Results:
- Angiotensin (1-7) treatment, particularly at 600 μg/kg/d, reduced body weight, triglyceride levels, and fasting blood glucose.
- Improved glucose tolerance and increased the proportion of beta cells and small islets.
- Significantly upregulated PDX-1 and GCK gene expression in pancreatic tissue.
Conclusions:
- Angiotensin (1-7) effectively improves glucose and lipid metabolism in db/db mice.
- The peptide enhances islet function and beta-cell health.
- Upregulation of PDX-1 and GCK expression is a key mechanism for angiotensin (1-7)'s beneficial effects.
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