Hyperhomocyst(e)inemia is a risk factor for arterial endothelial dysfunction in humans

Area of Science:

• Cardiovascular Research
• Vascular Biology
• Metabolic Syndrome

Background:

• Elevated homocysteine (hyperhomocysteinemia) is a known risk factor for vascular diseases.
• Homocysteine can damage endothelial cells, suggesting a role in early atherosclerosis.
• The association between hyperhomocysteinemia and endothelial dysfunction in asymptomatic adults requires further investigation.

Purpose of the Study:

• To evaluate the link between hyperhomocysteinemia and arterial endothelial dysfunction.
• To assess endothelial function in healthy, asymptomatic adults with varying homocysteine levels.

Main Methods:

• High-resolution ultrasound was used to measure brachial artery dilation.
• Endothelium-dependent flow-mediated dilation (EDD) and endothelium-independent nitroglycerin-induced dilation (GTN) were assessed.
• 14 hyperhomocysteinemic subjects were compared to 14 controls, matched for key health parameters.

Main Results:

• Hyperhomocysteinemic subjects exhibited significantly lower EDD compared to controls (6.5% vs. 10.8%, P<.001).
• No significant difference in GTN responses was observed between the groups (P=.90).
• Homocysteine level was identified as the strongest independent predictor of impaired EDD.

Conclusions:

• Hyperhomocysteinemia is an independent risk factor for arterial endothelial dysfunction.
• This dysfunction is a marker of early atherosclerosis in healthy middle-aged adults.
• Findings highlight the importance of managing homocysteine levels for vascular health.