Cinnamaldehyde prevents endothelial dysfunction induced by high glucose by activating Nrf2

Area of Science:

• Biochemistry
• Molecular Biology
• Cardiovascular Science

Background:

• Hyperglycemia-induced oxidative stress is a key factor in endothelial dysfunction.
• Cinnamaldehyde (CA), a cinnamon compound, activates Nrf2 and offers cardiovascular protection.
• The role of CA in high glucose-induced endothelial dysfunction is currently unknown.

Purpose of the Study:

• To investigate the protective effects of Cinnamaldehyde (CA) against high glucose-induced endothelial dysfunction.
• To elucidate the underlying mechanism involving Nrf2 activation and its downstream targets.

Main Methods:

• Mouse aortic rings and human umbilical vein endothelial cells (HUVECs) were cultured under normal (NG) or high glucose (HG) conditions.
• Treatment with Cinnamaldehyde (CA) (10 µM) was administered with or without high glucose.
• Assays included assessment of endothelial relaxation, reactive oxygen species (ROS) generation, nitric oxide (NO) levels, Nrf2 expression, and downstream protein levels.

Main Results:

• Cinnamaldehyde (CA) treatment preserved endothelial relaxation, reduced ROS generation, and maintained NO levels in high glucose conditions.
• CA upregulated Nrf2 expression and its nuclear translocation, increasing antioxidant enzymes (HO-1, NQO1, Catalase, Gpx1).
• CA attenuated nitrotyrosine levels and inhibited ROS generation while preserving NO levels in HUVECs, effects dependent on Nrf2 activation.

Conclusions:

• Cinnamaldehyde (CA) effectively protects against high glucose-induced endothelial dysfunction.
• This protective effect is mediated through the Nrf2 signaling pathway and upregulation of its target genes.
• CA shows promise as a therapeutic intervention for preventing vascular complications in diabetic patients.