Gap junction-mediated regulation of endothelial cellular stiffness

Area of Science:

• Vascular Biology
• Cellular Mechanics
• Biophysics

Background:

• Endothelial cells communicate via gap junctions, influencing vascular inflammation.
• Inflammatory mediators affect endothelial cell mechanical properties, but gap junction roles are unclear.
• Endothelial stiffness is a critical physical feature linked to vascular pathologies.

Purpose of the Study:

• To investigate the role of gap junctions in regulating endothelial cellular stiffness.
• To understand how gap junctions modulate endothelial mechanical properties during inflammation.

Main Methods:

• Utilized atomic force microscopy to measure living endothelial cellular stiffness.
• Employed gap junction blockers (carbenoxolone, anti-connexin antibodies) to assess functional roles.
• Analyzed cytoskeletal rearrangement and focal adhesion formation.

Main Results:

• Tumor necrosis factor-α (TNF-α) transiently increased endothelial cellular stiffness.
• TNF-α-induced stiffening involved cytoskeletal rearrangement and cell-cell interactions.
• Gap junction blockade prolonged TNF-α-induced stiffening and promoted focal adhesion formation.

Conclusions:

• Gap junction-mediated cell-cell interactions are crucial regulators of endothelial cellular stiffness.
• Modulating gap junction activity impacts endothelial mechanical responses to inflammatory stimuli.
• Findings highlight gap junctions as potential therapeutic targets in vascular diseases.