Mitochondrial Dysfunction: A New Hallmark in Hereditable Thoracic Aortic Aneurysm Development

Area of Science:

• Cardiovascular Biology
• Genetics
• Mitochondrial Medicine

Background:

• Thoracic aortic aneurysms (TAAs) are a major health concern, often asymptomatic until rupture, with limited treatment options.
• Hereditary factors like Marfan syndrome (FBN1 mutations), Loeys-Dietz syndrome (TGF-β pathway), and ACTA2 mutations contribute to TAA development.
• Shared features include aortic medial degeneration, smooth muscle cell dysfunction, and extracellular matrix remodeling, weakening the aortic wall.

Purpose of the Study:

• To review mitochondrial dysfunction as a unifying mechanism in hereditary TAAs.
• To explore the interplay between extracellular matrix and mitochondrial homeostasis in TAA pathogenesis.
• To identify novel therapeutic targets for hereditary TAA.

Main Methods:

• Literature review focusing on genetic causes of TAA.
• Analysis of pathophysiological mechanisms including extracellular matrix remodeling and smooth muscle cell function.
• Synthesis of recent evidence linking mitochondrial dysfunction to TAA development, particularly in Marfan syndrome.

Main Results:

• Mitochondrial dysfunction is increasingly recognized as critical in hereditary TAA, especially Marfan syndrome.
• Disruption of the extracellular matrix-mitochondrial axis exacerbates aortic wall pathology.
• This highlights a novel pathway beyond traditional ECM remodeling and smooth muscle cell dysfunction.

Conclusions:

• Mitochondrial dysfunction presents a potential unifying mechanism across various hereditary TAAs.
• Understanding the ECM-mitochondrial relationship offers new insights into TAA development.
• Mitochondrial boosters may represent a promising therapeutic avenue for hereditary TAA patients.