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Pathogenesis of vascular disease in hyperhomocysteinaemia
T B Domagała1, A Undas, M Libura
1Department of Medicine, University School of Medicine, Jagiellonian University, Cracow, Poland.
Insights
High homocysteine levels (hyperhomocysteinaemia) are linked to vascular diseases like atherosclerosis and thrombosis. Research explores how homocysteine causes endothelial dysfunction and promotes clot formation, seeking new prevention strategies.
Area of Science:
- Biochemistry
- Vascular Biology
- Cardiovascular Disease Research
Background:
- Elevated plasma homocysteine is a known risk factor for atherosclerosis and thrombosis.
- The precise mechanisms underlying homocysteine's atherothrombotic effects remain incompletely understood.
Purpose of the Study:
- To elucidate the in vivo mechanisms by which hyperhomocysteinaemia contributes to vascular disease.
- To identify potential targets for preventing and treating homocysteine-mediated atherothrombosis.
Main Methods:
- Review of accumulating evidence on homocysteine's effects on vascular cells and processes.
- Analysis of proposed mechanisms including oxidative stress, cellular proliferation, thrombin generation, and endothelial interactions.
Main Results:
- Hyperhomocysteinaemia is implicated in endothelial injury and dysfunction via free radical generation.
- Homocysteine affects vascular smooth-muscle cell proliferation, endothelial cell growth, and nitric oxide bioavailability.
- Potential pro-thrombotic effects include increased thrombin generation and enhanced monocyte/neutrophil adhesion.
Conclusions:
- Multiple pathways link hyperhomocysteinaemia to atherogenesis, involving oxidative stress, cellular dysfunction, and altered coagulation.
- Understanding these mechanisms is crucial for developing novel therapeutic strategies against vascular disease.
Abstract:
Elevated plasma homocysteine is an independent risk factor for atherosclerosis and thrombosis. The exact mechanism by which homocysteine exerts its atherothrombotic action is still unclear. Accumulating evidence suggests that hyperhomocysteinaemia leads to endothelial injury and dysfunction, mediated by free radicals generated during the oxidation of homocysteine. Homocysteine also stimulates the proliferation of vascular smooth-muscle cells and inhibits the growth of vascular endothelial cells. Elevated homocysteine levels may also promote thrombosis by increased generation of thrombin. Other possible mechanisms for homocysteine-mediated atherogenesis include: the altered methylation of DNA and altered regulatory proteins associated with cell membrane, decreased bioavailability of nitric oxide, increased elastolysis and collagen accumulation, overstimulation of N-methyl-D-aspartate receptors and excessive adhesion of monocytes and neutrophils to endothelium. Understanding the mechanisms in vivo by which hyperhomocysteinaemia is associated with vascular disease may provide new approaches to prevention and treatment of atherothrombosis.