Homocysteine to hydrogen sulfide or hypertension

Area of Science:

• Cardiovascular Science
• Metabolic Disorders
• Vascular Biology

Background:

• Hyperhomocysteinemia, elevated plasma homocysteine, is a risk factor for premature arterial disease and venous thromboembolism.
• It causes vascular dysfunction by increasing blood pressure and impairing nitric oxide-mediated vasorelaxation.
• Homocysteine disrupts vascular elastance by activating metalloproteinases and altering the elastin/collagen ratio.

Purpose of the Study:

• To review the mechanisms linking hyperhomocysteinemia to hypertension.
• To highlight the role of hydrogen sulfide (H2S) in mitigating hyperhomocysteinemia-induced vascular dysfunction.
• To explore H2S as a potential therapeutic target for hypertension.

Main Methods:

• Literature review of studies on hyperhomocysteinemia, vascular dysfunction, and hypertension.
• Analysis of the biochemical pathways involving homocysteine metabolism and H2S production.
• Examination of the effects of homocysteine on endothelial function and vascular smooth muscle cells.

Main Results:

• Hyperhomocysteinemia impairs endothelial function and promotes hypertension through mechanisms including increased blood pressure and reduced vasorelaxation.
• Homocysteine inactivates cystathionine gamma-lyase, an enzyme crucial for H2S production, leading to H2S deficiency.
• Reduced H2S levels contribute to the development of hypertension and vascular diseases.

Conclusions:

• Hyperhomocysteinemia-induced hypertension is linked to impaired H2S production.
• H2S acts as a protective factor, and its deficiency exacerbates vascular dysfunction.
• Modulating H2S levels presents a novel therapeutic strategy for managing hyperhomocysteinemia-associated hypertension.