[Elastin and microfibrils in vascular development and ageing: complementary or opposite roles?]

Area of Science:

• Cardiovascular Biology
• Molecular Biology
• Genetics

Background:

• Large arteries rely on elastic fibers for elasticity and blood flow regulation.
• Elastic fibers, composed of elastin and fibrillin-rich microfibrils, have mechanical and signaling roles.
• Alterations in elastin or fibrillin genes cause cardiovascular pathologies.

Purpose of the Study:

• To investigate the dual mechanical and signaling functions of elastic fibers in vascular development and aging.
• To understand the pathogenesis of genetic cardiovascular diseases linked to elastin and fibrillin defects.
• To explore the complementary and opposing roles of elastin and fibrillin-1.

Main Methods:

• Analysis of genetically-engineered mouse models (Eln+/-, Fbn-1+/mgΔ, Eln+/-Fbn-1+/- mice).
• Study of cellular responses to elastin peptides, tropoelastin, and fibrillin-1 fragments.
• Examination of vascular physiology and aging processes in relation to protein availability.

Main Results:

• Elastic fibers are essential for vascular elasticity, hemodynamics, and cell signaling.
• Deficiencies in elastin or fibrillin-1 lead to distinct cardiovascular pathologies (stenosis vs. aneurysms).
• Combined elastin and fibrillin-1 deficiencies exhibit complex interactions, affecting arterial wall stress and diameter.

Conclusions:

• Elastic fibers play a critical dual role in vascular health, development, and aging.
• Genetic defects in elastin and fibrillin-1 cause severe cardiovascular diseases.
• Early modifications in elastic fiber components significantly impact long-term vascular function and aging.