Nuclear SUN2 coordinates endothelial cell-matrix interactions to regulate blood vessel homeostasis and barrier...

Area of Science:

• Cell Biology
• Biophysics
• Cardiovascular Research

Background:

• Vascular endothelial cells sense and respond to mechanical forces for vessel remodeling and homeostasis.
• The Linker of Nucleoskeleton and Cytoskeleton (LINC) complex, including SUN2, is implicated in nuclear force transduction.
• Dysregulated responses to mechanical forces contribute to vascular dysfunction and disease.

Purpose of the Study:

• To investigate the role of SUN2 in endothelial cell-matrix interactions and force transduction.
• To elucidate how SUN2 regulates vascular responses to environmental forces and maintains vessel integrity.

Main Methods:

• Depletion of SUN2 in endothelial cells.
• In vitro and in vivo studies of angiogenic expansion and vascular responses to flow.
• Analysis of gene expression, extracellular matrix, focal adhesions, and microtubule cytoskeleton dynamics.

Main Results:

• SUN2 is essential for endothelial cell-matrix interactions, angiogenic expansion, and responses to blood flow.
• SUN2 depletion led to reduced expression of matrix and adhesion genes, defective extracellular matrix, and abnormal focal adhesions.
• Nuclear SUN2 influences microtubule dynamics, affecting focal adhesion turnover and matrix metalloprotease-dependent barrier function.

Conclusions:

• Nuclear SUN2 plays a vital role in maintaining blood vessel homeostasis by regulating microtubule-mediated effects on focal adhesion turnover and extracellular matrix.
• SUN2's function has implications for cardiovascular aging and diseases affecting vessel wall integrity, such as Marfan syndrome.