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Hyperhomocysteinemia and thrombosis.

M Cattaneo1

  • 1Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Department of Internal Medicine, IRCCS Ospedale Maggiore, University of Milano, Italy. marco.cattaneo@unimi.it

Lipids
|February 12, 2002
PubMed
Summary

High homocysteine (Hcy) levels are linked to arterial disease and blood clots. While vitamins lower Hcy, their effect on preventing vascular events is still under investigation in ongoing trials.

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Area of Science:

  • Cardiovascular Science
  • Metabolic Biochemistry
  • Vascular Biology

Background:

  • Homocysteine (Hcy) is a metabolic byproduct of methionine, requiring B vitamins (folic acid, B12, B6) as cofactors.
  • Early research linked severe hyperhomocysteinemia to atherosclerosis; subsequent studies suggest moderate elevations increase occlusive arterial disease risk.
  • Emerging evidence implicates hyperhomocysteinemia in both atherogenesis and thrombogenesis, highlighting its potential role in vascular and venous thromboembolic events.

Purpose of the Study:

  • To review the association between hyperhomocysteinemia and vascular diseases.
  • To discuss the potential mechanisms linking homocysteine to atherogenesis and thrombogenesis.
  • To evaluate the efficacy of vitamin supplementation in reducing vascular risk.

Main Methods:

  • Literature review of observational and prospective cohort studies.
  • Analysis of findings from randomized, placebo-controlled trials on vitamin supplementation.
  • Synthesis of evidence on homocysteine's role in cardiovascular and thromboembolic diseases.

Main Results:

  • Consistent association between moderate hyperhomocysteinemia and cardiovascular morbidity/mortality in at-risk populations.
  • Growing evidence links hyperhomocysteinemia to increased risk of venous thromboembolism.
  • Vitamin supplementation effectively lowers plasma total homocysteine (tHcy) levels.

Conclusions:

  • The causal relationship between hyperhomocysteinemia and vascular disease remains under investigation.
  • Ongoing randomized trials are crucial to determine if lowering tHcy with vitamins reduces vascular event risk.
  • Understanding homocysteine's role is vital for potential advancements in thromboembolic event prevention.

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