Morphological differences between guinea pig aortic and venous endothelial cells in situ

Area of Science:

• Cardiovascular Biology
• Cellular Mechanotransduction
• Endothelial Cell Biology

Background:

• Endothelial cells (ECs) are crucial for vascular health and respond to hemodynamic forces.
• Fluid shear stress (SS) significantly impacts EC morphology and cytoskeletal organization.
• The in situ cytoskeletal organization of ECs, particularly in different vascular beds, remains incompletely understood.

Purpose of the Study:

• To investigate the distribution of stress fibers (SFs) and focal adhesion (FA) proteins in guinea pig aortic and venous ECs.
• To compare the cytoskeletal organization and cell shape of ECs in arteries versus veins under physiological conditions.
• To elucidate the potential role of sustained, low shear stress in shaping venous EC structure.

Main Methods:

• Utilized a high-resolution live imaging system with ultrasound.
• Examined the distribution of stress fibers (SFs) and focal adhesion (FA) associated proteins.
• Analyzed morphological characteristics of endothelial cells from guinea pig aorta and vena cava.

Main Results:

• Venous ECs displayed fewer and smaller stress fibers compared to aortic ECs.
• Stress fibers in venous ECs were oriented along the direction of blood flow.
• Venous ECs showed greater elongation in the direction of flow than aortic ECs.

Conclusions:

• Sustained, unidirectional, low shear stress in veins may induce specific cytoskeletal adaptations.
• Differences in shear stress levels between arteries and veins contribute to distinct EC structural phenotypes.
• Understanding these adaptations is vital for comprehending vascular physiology and disease.