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Area of Science:

  • Cardiovascular Science
  • Biochemistry
  • Pathophysiology

Background:

  • High homocysteine (HHcy) is linked to premature vascular diseases, including peripheral, coronary, and cerebrovascular conditions.
  • HHcy contributes to vascular injury through endothelial damage, oxidative stress, and inflammation.
  • Endothelial dysfunction, a key factor in atherosclerosis, is associated with HHcy and conditions like hypertension and diabetes.

Purpose of the Study:

  • To review the mechanisms by which HHcy causes endothelial dysfunction.
  • To explore the metabolism and protective roles of hydrogen sulfide (H2S) in cardiovascular homeostasis.
  • To elucidate the complex signaling pathways through which H2S exerts its beneficial effects.

Main Methods:

  • Review of epidemiological studies linking HHcy to vascular disease.
  • Analysis of in vitro and in vivo studies on HHcy's effects on endothelial cells.
  • Examination of research on H2S metabolism and its physiological functions.

Main Results:

  • HHcy directly damages endothelial cells, impairing nitric oxide synthesis and bioavailability, leading to atherothrombogenesis and oxidative stress.
  • Hydrogen sulfide (H2S), derived from homocysteine, acts as a vasodilator and protects the endothelium.
  • H2S modulates cellular functions via various intracellular signaling pathways, though mechanisms require further elucidation.

Conclusions:

  • HHcy-induced endothelial dysfunction is a significant contributor to vascular disease development.
  • H2S emerges as a critical endogenous protective agent in cardiovascular health.
  • Further research is needed to fully understand H2S's signaling mechanisms and therapeutic potential.