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Related Experiment Videos

Homocysteine, coagulation, platelet function, and thrombosis.

A Coppola1, G Davi, V De Stefano

  • 1Department of Clinical and Experimental Medicine, University of Naples Federico II, Italy.

Seminars in Thrombosis and Hemostasis
|September 30, 2000
PubMed
Summary

High homocysteine (HHcy) is a vascular risk factor. Oxidative stress from homocysteine (Hcy) may cause vascular injury and thrombosis, impacting cell repair and promoting clotting.

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Area of Science:

  • Vascular Biology
  • Thrombosis
  • Biochemistry

Background:

  • Hyperhomocysteinemia (HHcy) is an established independent vascular risk factor.
  • Mechanisms linking elevated homocysteine (Hcy) to vascular injury and thrombosis are not fully understood.
  • Previous studies often used high in vitro Hcy concentrations, with limited in vivo human data.

Purpose of the Study:

  • To elucidate the mechanisms by which elevated homocysteine contributes to vascular injury and thrombosis.
  • To investigate the role of oxidative stress and impaired cell repair in HHcy-associated thrombosis.
  • To explore potential therapeutic interventions targeting Hcy-induced vascular pathology.

Main Methods:

  • Review of existing literature on hyperhomocysteinemia and vascular disease.

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  • Analysis of in vitro and in vivo studies in homocystinuric patients and healthy individuals.
  • Examination of biochemical pathways involving homocysteine autooxidation, reactive oxygen species, and methyltransferase inhibition.

    • Main Results:

    • Homocystinuric patients exhibit coagulation abnormalities and in vivo platelet activation.
    • Antioxidant drug probucol partially corrects platelet activation, suggesting a role for oxidative stress.
    • Homocysteine autooxidation generates reactive oxygen species, leading to lipid peroxidation and potential endothelial dysfunction.
    • Accumulation of adenosylhomocysteine inhibits methyltransferases, impairing cellular repair.

    Conclusions:

    • Oxidative stress induced by homocysteine is a key factor in the pathogenesis of thrombosis in HHcy.
    • Impaired cellular repair due to methyltransferase inhibition offers another pathway contributing to thrombosis risk.
    • These findings highlight the critical role of homocysteine metabolism and oxidative stress in vascular health.