Homocysteinemia is a risk factor for aortic dissection.

Area of Science:

• Cardiovascular Science
• Biochemistry
• Genetics

Background:

• Homocysteine is associated with ischemic heart disease, deep vein thrombosis, pulmonary embolism, and stroke.
• While hypertension is a known risk factor for aortic dissection, homocysteinemia's role, particularly in Marfan syndrome, is emerging.
• Reduced fibrillin-1 deposition, seen in Marfan syndrome and isolated aortic aneurysms/dissections, weakens elastic tissue.

Purpose of the Study:

• To investigate the potential role of homocysteine in the development of aortic dissection.
• To propose a novel hypothesis linking homocysteinemia to aortic dissection risk.

Main Methods:

• Review of existing literature on homocysteine, cardiovascular diseases, and aortic dissection.
• Analysis of the biochemical mechanisms by which homocysteine affects connective tissue, specifically fibrillin-1 and elastin.
• Examination of the role of matrix metalloproteinases in connective tissue degradation.

Main Results:

• Homocysteine is associated with several cardiovascular diseases and abdominal aortic aneurysms.
• Homocysteine contributes to the breakdown of arterial elastic fibers through elastolytic activation.
• Fibrillin-1 is susceptible to homocysteine attack, leading to cumulative damage and progressive clinical manifestations.

Conclusions:

• Homocysteine plays a significant role in the development of aortic dissection.
• Homocysteinemia is proposed as a novel risk factor for aortic dissection, independent of Marfan syndrome.
• Understanding homocysteine's impact on connective tissue integrity is crucial for preventing aortic dissections.