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Control of Cell Adhesion using Hydrogel Patterning Techniques for Applications in Traction Force Microscopy
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Spatial confinement modulates endothelial cell behavior and traction force in 3D hydrogel microgrooves.

Wenli Jiang1, Xinghong Yao2, Jian Zhong1

  • 1Institute of Biomedical Engineering, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, PR China.

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Spatial confinement in curved microgrooves alters endothelial cell (EC) behavior. Integrins, especially αV-integrin, mediate cell responses to this environment, impacting apoptosis and cell traction force.

Keywords:
Cell apoptosisCell traction forceHydrogel microgrooveMicropatterningVascular endothelial cell

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Area of Science:

  • Biomaterials Engineering
  • Cell Biology
  • Vascular Biology

Background:

  • Vascular endothelial cells (ECs) experience diverse mechanical environments due to blood vessel curvature.
  • Integrins are crucial for cell-matrix interactions, linking the extracellular matrix to the cytoskeleton and influencing cell behavior.

Purpose of the Study:

  • To investigate the effects of spatial confinement and microgroove curvature on human umbilical vein ECs (HUVECs).
  • To elucidate the role of integrins in mediating HUVEC responses to confined, curved microenvironments.

Main Methods:

  • Fabrication of 3D hydrogel microgrooves with controlled wall curvatures using maskless lithography.
  • Culturing HUVECs within these microgrooves to assess cell behavior, orientation, apoptosis, and integrin expression.
  • Utilizing cilengitide to inhibit αV-integrin and evaluate its impact on cellular responses.

Main Results:

  • HUVECs in curved microgrooves showed reduced size, enhanced orientation, and increased apoptosis.
  • Microgroove curvature significantly influenced cell orientation and apoptosis rates.
  • Elevated integrin expression was observed in HUVECs within microgrooves.
  • αV-integrin inhibition reduced apoptosis and cell traction force, without affecting proliferation.
  • Integrin-mediated cell traction force correlated with spatial confinement.

Conclusions:

  • Spatial confinement in hydrogel microgrooves significantly impacts EC behavior, including apoptosis and orientation.
  • Integrins, particularly αV-integrin, play a critical role in mediating EC responses to mechanical confinement.
  • Targeting integrins may offer therapeutic strategies for modulating EC behavior in vascular diseases.