Flow detection and calcium signalling in vascular endothelial cells

Area of Science:

• Cardiovascular Biology
• Mechanobiology
• Endothelial Cell Biology

Background:

• Blood vessels dynamically adapt to blood flow, a process mediated by endothelial cells (ECs).
• ECs sense shear stress from flowing blood, initiating intracellular signals crucial for vascular homeostasis.
• Dysfunctional EC shear stress responses contribute to vascular diseases like hypertension and atherosclerosis.

Purpose of the Study:

• To investigate the mechanisms of shear stress mechanotransduction in endothelial cells.
• To identify the initial sensor molecules and pathways involved in endothelial shear stress detection.
• To understand the role of EC shear stress sensing in vascular health and disease.

Main Methods:

• Utilized in vitro methods with controlled shear stress application to cultured ECs.
• Employed fluid-dynamically designed flow-loading devices for precise shear stress application.
• Analyzed intracellular signaling pathways activated by shear stress.

Main Results:

• Shear stress is converted into intracellular biochemical signals via various membrane molecules and microdomains.
• Multiple downstream signaling pathways are activated concurrently in response to shear stress.
• Key sensor molecules and the precise sensing mechanisms remain unidentified.

Conclusions:

• Endothelial shear stress sensing is vital for regulating vascular tone, coagulation, angiogenesis, and remodeling.
• While signaling pathways are known, the initial shear stress sensors are yet to be discovered.
• Identifying these sensors is critical for understanding vascular diseases and developing novel therapeutics.