SIRT1 inhibition causes oxidative stress and inflammation in patients with coronary artery disease

Area of Science:

• Cardiovascular Biology
• Molecular Medicine
• Immunology

Background:

• Coronary artery disease (CAD) involves endothelial and monocyte dysfunction, leading to inflammation and vessel damage.
• Therapeutic strategies targeting cell death and inflammation are crucial for improving CAD patient outcomes.
• Sirtuin 1 (SIRT1) possesses antioxidant, anti-inflammatory, and anti-apoptotic properties beneficial for cardiovascular health.

Purpose of the Study:

• To investigate the role of SIRT1 in monocytes of patients with coronary artery disease (CAD).
• To explore the relationship between SIRT1 expression, oxidative stress, and inflammatory responses in CAD monocytes.
• To understand how CAD monocytes affect endothelial cells and contribute to recurrent ischemic events.

Main Methods:

• Analysis of SIRT1 and acetylated p53 expression levels in monocytes from CAD patients.
• Assessment of LOX-1 and oxidative stress markers in CAD monocytes.
• Evaluation of endothelial cell activation and monocyte-endothelial cell adhesion in vitro.

Main Results:

• Reduced SIRT1 expression and increased acetylated p53 were observed in monocytes from CAD patients.
• Upregulated LOX-1 and oxidative stress were found in CAD monocytes, promoting apoptosis and inflammation.
• CAD patient-derived monocytes induced endothelial adhesion molecule activation and increased monocyte-endothelial cell adherence.

Conclusions:

• Decreased SIRT1 in monocytes contributes to increased apoptosis and inflammation in CAD.
• LOX-1/oxidative stress pathways are implicated in the monocyte dysfunction seen in CAD.
• These findings provide insights into the mechanisms underlying recurrent ischemic events in CAD patients and suggest potential therapeutic targets.