Disturbed fluid flow reinforces endothelial tractions and intercellular stresses

Area of Science:

• Cardiovascular Biology
• Cellular Biomechanics
• Fluid Dynamics

Background:

• Endothelial cells are crucial for vascular health.
• Disturbed fluid flow is linked to endothelial dysfunction.
• The impact of disturbed flow on endothelial biomechanics remains unclear.

Purpose of the Study:

• To investigate the biomechanical responses of endothelial cells to disturbed fluid flow.
• To quantify tractions, intercellular stresses, and cell velocity in varying flow zones.
• To determine the relationship between shear stress gradients and endothelial cell behavior.

Main Methods:

• Utilized a custom-fabricated flow chamber to expose endothelial cells to disturbed fluid flow.
• Measured endothelial cell tractions, intercellular stresses, and velocity across distinct spatial zones.
• Quantified shear stress levels within each zone of the flow chamber.

Main Results:

• Endothelial cell tractions and intercellular stresses peaked in the middle zone (zone 2) and were lowest at the outlet (zone 3).
• Cell velocity was highest at the inlet (zone 1) and lowest in the middle zone (zone 2).
• Observed biomechanical responses varied with spatial shear stress gradients.

Conclusions:

• Endothelial biomechanical responses to disturbed flow are influenced by both shear stress magnitude and spatial gradients.
• Findings provide insights into endothelial cell behavior under complex flow conditions.
• Results are relevant for endothelial cell biology, cardiovascular research, and cellular biomechanics.