Microtubule disruption changes endothelial cell mechanics and adhesion

Area of Science:

• Cellular mechanics
• Cytoskeletal dynamics
• Biophysics

Background:

• The cytoskeleton is vital for cell mechanics, but the specific role of microtubules remains unclear.
• Understanding cell mechanical and adhesive properties is crucial and has gained recent interest.
• Endothelial cells are key in vascular function and their mechanics are of significant interest.

Purpose of the Study:

• To investigate the role of microtubules in the cytomechanics of Human Umbilical Vein Endothelial Cells (HUVECs).
• To analyze the time-dependent variations in cell-tip adhesion.
• To correlate microtubule disruption with changes in cell mechanical properties.

Main Methods:

• Atomic Force Microscopy (AFM) for mechanical property assessment.
• Confocal fluorescence microscopy for visualizing cytoskeletal changes.
• Controlled disruption of microtubules using varying colchicine concentrations over time.

Main Results:

• Microtubule disruption led to increased cell stiffness and reduced fluidity within 30 minutes.
• Cell-tip adhesion decreased following microtubule disruption.
• Observed cytoskeletal rearrangements, reduced cell area, and altered cell shape.
• Dose-dependent effects were noted for colchicine concentrations, with stable control values.

Conclusions:

• Microtubules play a critical role in determining the mechanical properties of endothelial cells.
• Changes in microtubule integrity directly impact cell stiffness, adhesion, and morphology.
• This study provides insights into the functional significance of microtubules in endothelial cell mechanics.