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[Homocysteine and cardiovascular risk]
1II. Interne Abteilung mit Kardiologie und Internistischer Intensivmedizin, a. ö. Krankenhaus der Barmherzigen Schwestern vom Hl. Kreuz, Grieskirchner Strasse 42, A-4600 Wels. johann.auer@khwels.at
Wiener Medizinische Wochenschrift (1946)
|March 10, 2001
Summary
High homocysteine levels are linked to atherosclerosis. Folic acid may lower homocysteine and improve endothelial function, but large trials are needed to confirm its role in preventing vascular disease.
Area of Science:
- Biochemistry
- Cardiovascular Science
- Genetics
Context:
- Homocysteine, an amino acid, is integral to methionine metabolism.
- Homocystinuria, an inherited disorder, is associated with accelerated atherosclerosis.
- Elevated homocysteine levels are observed in patients with coronary artery disease.
Purpose:
- To investigate the role of homocysteine in vascular wall injury and atherogenesis.
- To explore the potential of folic acid and vitamin B12 in managing homocysteine levels.
- To assess the impact of homocysteine on cardiovascular health.
Summary:
- Folic acid and vitamin B12 act as cofactors for methionine synthase, an enzyme crucial for homocysteine metabolism.
- Folic acid supplementation is a primary strategy for reducing plasma homocysteine concentrations and has shown improvements in endothelial function.
- Despite associations, a clear pathophysiological model linking hyperhomocysteinemia to atherosclerosis is lacking, and routine homocysteine testing is not yet standard.
Impact:
- Further large-scale clinical trials are essential to validate the efficacy of folic acid and vitamin B supplementation in the primary and secondary prevention of atherosclerotic vascular disease.
- The clinical relevance of hyperhomocysteinemia as a direct cause of atherosclerosis remains under investigation.
- Current evidence does not support routine homocysteine level testing or vitamin supplementation for preventing cardiovascular events.