Related Experiment Video
Updated: Jun 15, 2026
En Face Detection of Nitric Oxide and Superoxide in Endothelial Layer of Intact Arteries
Published on: February 25, 2016
Advanced glycation end-products induce vascular dysfunction via resistance to nitric oxide and suppression of
Aino Soro-Paavonen1, Wei-Zeng Zhang, Kylie Venardos
1JDRF Einstein Centre for Diabetes Complications, Melbourne, Australia.
Objective:
A number of factors contribute to diabetes-associated vascular dysfunction. In the present study, we tested whether exposure to advanced glycation end-products (AGEs) impairs vascular reactivity independently of hyperglycemia and examined the potential mechanisms responsible for diabetes and AGE-associated vascular dysfunction.
Methods:
Vasodilator function was studied using infusion of exogenous AGEs into Sprague-Dawley rats as compared with control and streptozotocin-induced diabetic rats all followed for 16 weeks (n = 10 per group). The level of arginine metabolites and expression of endothelial nitric oxide synthase (eNOS) and downstream mediators of nitric oxide-dependent signaling were examined. To further explore these mechanisms, cultured bovine aortic endothelial cells (BAECs) were exposed to AGEs.
Results:
Both diabetic and animals infused with AGE-modified rat serum albumin (AGE-RSA) had significantly impaired vasodilatory response to acetylcholine. Unlike diabetes-associated endothelial dysfunction, AGE infusion was not associated with changes in plasma arginine metabolites, asymmetric dimethyl-L-arginine levels or eNOS expression. However, expression of the downstream mediator cGMP-dependent protein kinase 1 (PKG-1) was significantly reduced by both AGE exposure and diabetes. AGEs also augmented hyperglycemia-associated depletion in endothelial nitric oxide production and eNOS protein expression in vitro, and the novel AGE inhibitor, alagebrium chloride, partly restored these parameters.
Conclusion:
We demonstrate that AGEs represent a potentially important cause of vascular dysfunction, linked to the induction of nitric oxide resistance. These findings also emphasize the deleterious and potentially additive effects of AGEs and hyperglycemia in diabetic vasculature.
Insights
Advanced glycation end-products (AGEs) impair vascular reactivity independently of hyperglycemia, contributing to diabetic vascular dysfunction. AGEs induce nitric oxide resistance, highlighting their detrimental effects alongside high blood sugar.
Area of Science:
- Cardiovascular Research
- Endocrinology
- Molecular Biology
Background:
- Diabetes mellitus is a leading cause of vascular dysfunction.
- Advanced glycation end-products (AGEs) are implicated in diabetic complications.
- The independent role of AGEs in vascular impairment requires further elucidation.
Purpose of the Study:
- To determine if AGEs impair vascular reactivity independently of hyperglycemia.
- To investigate the mechanisms underlying AGE- and diabetes-associated vascular dysfunction.
- To assess the impact of AGEs on nitric oxide signaling pathways.
Main Methods:
- Utilized Sprague-Dawley rats, including diabetic and AGE-infused models.
- Assessed vasodilator function via acetylcholine infusion.
- Examined arginine metabolites, endothelial nitric oxide synthase (eNOS), and downstream signaling molecules (e.g., cGMP-dependent protein kinase 1).
- Investigated mechanisms in cultured bovine aortic endothelial cells (BAECs) exposed to AGEs.
Main Results:
- Both diabetic rats and those infused with AGE-modified serum albumin showed impaired vasodilation.
- AGE infusion did not alter plasma arginine metabolites or eNOS expression, differentiating it from diabetes-associated dysfunction.
- Both AGE exposure and diabetes reduced cGMP-dependent protein kinase 1 expression.
- AGEs exacerbated hyperglycemia-induced decreases in nitric oxide production and eNOS expression in vitro.
- The AGE inhibitor alagebrium chloride partially reversed these effects.
Conclusions:
- AGEs are a significant contributor to vascular dysfunction by inducing nitric oxide resistance.
- AGEs have deleterious and potentially additive effects on the diabetic vasculature when combined with hyperglycemia.
- Targeting AGEs may offer a therapeutic strategy for diabetic vascular complications.
Related Concept Videos
01:28Nitric Oxide Signaling Pathway
01:26Coronary Artery Disease II: Pathophysiology
01:22Diabetic Neuropathy
01:28Diabetic Nephropathy
01:16Antianginal Drugs: Nitrates and β-Blockers
Organic nitrates, such as nitroglycerin, play a pivotal role. Once metabolized, they liberate nitric oxide, a molecular marvel. Nitric oxide triggers guanylyl cyclase and augments cGMP production. This biochemical cascade orchestrates the relaxation of vascular smooth muscles, ushering in vasodilation and enhancing coronary blood flow. Administered...
01:23Antihypertensive Drugs: Vasodilators