Related Experiment Video
Updated: Apr 6, 2026
Assessing Endothelial Vasodilator Function with the Endo-PAT 2000
Published on: October 15, 2010
Homocysteine-Induced Endothelial Dysfunction
Wai Keung Christopher Lai1, Ming Yin Kan
1Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hung Hom, HKSAR, China.
Insights
High homocysteine levels (hyperhomocysteinemia) contribute to cardiovascular disease by impairing blood vessel function. This dysfunction involves reduced nitric oxide availability, leading to endothelial dysfunction and increased cardiovascular risk.
Area of Science:
- Cardiovascular Science
- Endothelial Biology
- Metabolic Pathways
Background:
- Hyperhomocysteinemia is a recognized independent risk factor for cardiovascular diseases, including atherosclerosis and ischemic heart attacks.
- Elevated homocysteine levels are linked to endothelial dysfunction, a condition affecting blood vessel health and function.
Purpose of the Study:
- To review the cellular pathways and biological processes underlying homocysteine-induced endothelial dysfunction.
- To emphasize the impact of homocysteine on endothelial-dependent vasodilation and nitric oxide bioavailability.
Main Methods:
- Review of existing literature on homocysteine, endothelial function, and nitric oxide metabolism.
- Discussion of mechanisms including nitric oxide synthase uncoupling, oxidative stress, and inflammation.
- Mention of flow-mediated dilation using ultrasound as a monitoring method for endothelial dysfunction.
Main Results:
- Elevated homocysteine reduces nitric oxide (NO) bioavailability through multiple pathways.
- Mechanisms include impaired NO synthesis, increased NO degradation by oxidative stress, and inhibition by asymmetric dimethylarginine.
- Endoplasmic reticulum stress, apoptosis, inflammation, and prothrombotic conditions also contribute to endothelial dysfunction.
Conclusions:
- Homocysteine-induced endothelial dysfunction is primarily mediated by impaired nitric oxide bioavailability.
- Understanding these mechanisms is crucial for comprehending the link between hyperhomocysteinemia and cardiovascular risk.
- Further research into these pathways can inform strategies for managing cardiovascular disease associated with elevated homocysteine.
Abstract:
This review discussed and in particular emphasis the potential cellular pathways and the biological processes involved that lead to homocysteine-induced endothelial dysfunction, in particular in the impaired endothelial dependent dilatation aspect. Hyperhomocysteinemia is an independent cardiovascular risk factor that has been associated with atherosclerotic vascular diseases and ischemic heart attacks. The potential mechanisms by which elevated plasma homocysteine level leads to reduction in nitric oxide bioavailability include the disruptive uncoupling of nitric oxide synthase activity and quenching of nitric oxide by oxidative stress, the enzymatic inhibition by asymmetric dimethylarginine, endoplasmic reticulum stress with eventual endothelial cell apoptosis, and chronic inflammation/prothrombotic conditions. Homocysteine-induced endothelial dysfunction presumably affecting the bioavailability of the potent vasodilator 'nitric oxide', and such dysfunction can easily be monitor by flow-mediated dilation method using ultrasound. Understanding the mechanisms by which plasma homocysteine alter endothelial nitric oxide production is therefore essential in the comprehension of homocysteine-induced impairment of endothelial dependent dilatation, and its association of cardiovascular risk and its pathophysiology.
Related Concept Videos
01:19Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
01:29Hypertension II: Pathophysiology
01:26Coronary Artery Disease II: Pathophysiology
01:24Regulation of Angiogenesis and Blood Supply