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Cell-matrix's Response to Mechanical Forces01:13

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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
Anchoring junctions mechanically attach a cell to the...
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Gene Expression Analysis of Endothelial Cells Exposed to Shear Stress Using Multiple Parallel-plate Flow Chambers
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Developing a Flow-Resistance Module for Elucidating Cell Mechanotransduction on Multiple Shear Stresses.

Ziliang Zhang1,2, Zhi Zheng2,3, Yuxin Gao2

  • 1Medical Science and Technology Innovation Center, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250117, China.

ACS Biomaterials Science & Engineering
|December 16, 2024
PubMed
Summary

Researchers developed a new microfluidic device to precisely control fluid shear stress, enabling detailed study of cellular responses to physiological and pathological conditions. This tool aids in understanding tissue homeostasis and disease progression.

Keywords:
HCC cellsendothelial cellsflow resistancemechanobiologymicrofluidic platform

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Mechanobiology

Background:

  • Fluid shear stress is critical for cellular functions, tissue health, and disease development.
  • Cells respond uniquely to varying shear stress levels, necessitating precise experimental control.
  • Understanding cellular mechanotransduction is key to tissue engineering and disease research.

Purpose of the Study:

  • To develop a novel flow-resistance module for precise control of fluid shear stress in microfluidic cell culture.
  • To validate the module's performance using computational fluid dynamics and flow calibration.
  • To investigate cellular responses to a wide range of physiologically and pathologically relevant shear stresses.

Main Methods:

  • Development of a microfluidic flow-resistance module with three microchannels.
  • Validation using computational fluid dynamics (CFD) simulations and flow calibration experiments.
  • Analysis of gene expression, cytoskeletal remodeling, cell morphology, and YAP nuclear translocation under controlled shear stress.

Main Results:

  • The flow-resistance module generated steady wall shear stresses from 0.06 to 11.57 dyn/cm2.
  • Cellular responses, including gene expression and YAP translocation, showed a clear increasing trend with elevated shear stress.
  • The experimental platform demonstrated reliability in characterizing shear stress-induced cellular changes.

Conclusions:

  • The developed flow-resistance module offers precise control over fluid shear stress for cell culture applications.
  • This platform facilitates detailed investigation into cellular mechanobiology and responses to shear stress.
  • The findings support the module's utility in characterizing cellular behavior under diverse shear stress conditions relevant to health and disease.