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Imaging Integrin Tension and Cellular Force at Submicron Resolution with an Integrative Tension Sensor
Published on: April 25, 2019
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β1 integrin is a sensor of blood flow direction
Ioannis Xanthis1, Celine Souilhol1, Jovana Serbanovic-Canic1
1Department of Infection, Immunity and Cardiovascular Disease, INSIGNEO Institute for In Silico Medicine, and the Bateson Centre, University of Sheffield, Sheffield S10 2TN, UK.
Journal of Cell Science
|May 12, 2019
Summary
Beta-1 integrin senses fluid shear stress direction, promoting vascular homeostasis. This mechanoreceptor is activated by unidirectional flow, crucial for endothelial cell alignment and stable blood flow.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Vascular Biology
Background:
- Endothelial cells (ECs) detect fluid shear stress direction, influencing vascular health.
- Unidirectional flow promotes EC alignment and homeostasis, while bidirectional flow causes disease.
- Mechanisms of EC shear stress direction sensing remain unclear.
Purpose of the Study:
- To investigate the role of beta-1 integrin in sensing fluid shear stress direction.
- To elucidate the mechanism by which ECs distinguish between unidirectional and bidirectional flow.
Main Methods:
- Utilized in vitro flow systems and magnetic tweezers to apply controlled shear forces.
- Performed en face staining and EC-specific genetic deletion studies in murine aortas.
- Assessed beta-1 integrin activation in response to different flow patterns.
Main Results:
- Beta-1 integrin is activated by unidirectional, but not bidirectional, shear forces.
- Pre-shearing in one direction amplified beta-1 integrin activation, indicating a feedforward interaction.
- Beta-1 integrin is essential for EC alignment in unidirectional flow but not activated in bidirectional flow areas in vivo.
Conclusions:
- Beta-1 integrin acts as a key sensor of unidirectional force, decoding blood flow mechanics.
- This sensing mechanism is vital for maintaining vascular homeostasis.
- A feedforward interaction between EC alignment and beta-1 integrin activity contributes to system stability.
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