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Cell-matrix's Response to Mechanical Forces01:13

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. This extracellular matrix (ECM) is composed of fibrous proteins like collagen, elastin, and fibronectin in a ground substance consisting of interstitial fluid, cell adhesion proteins, and proteoglycans. The proteoglycans form a gel-like material in the spaces between cells and provide hydration, buffering, binding, and force...
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Cells immersed in collagen matrices show a decrease in plasma membrane fluidity as the matrix stiffness increases.

Joao Aguilar1, Leonel Malacrida2, German Gunther3

  • 1Laboratorio de Interacciones Macromoleculares (LIMM), Departamento de Polímeros, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile.

Biochimica Et Biophysica Acta. Biomembranes
|June 16, 2023
PubMed
Summary
This summary is machine-generated.

Cellular plasma membranes adapt to mechanical cues from their environment. Increased extracellular matrix stiffness alters membrane fluidity distribution, impacting cell signaling and adaptation.

Keywords:
Collagen matricesExtracellular stiffnessLAURDANMembrane fluidityMembrane heterogeneitySpectral phasor analysis

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Area of Science:

  • Cell Biology
  • Biophysics
  • Materials Science

Background:

  • Cells dynamically adapt to environmental heterogeneity.
  • The plasma membrane is key in signal transduction.
  • Membrane fluidity domains respond to external mechanical signals, but links to matrix stiffness are under-explored.

Purpose of the Study:

  • To investigate how extracellular matrix stiffness affects plasma membrane fluidity domain distribution.
  • To test the hypothesis that matrix stiffness modifies the equilibrium of ordered/disordered areas in the plasma membrane.

Main Methods:

  • NIH-3T3 cells cultured in collagen type I matrices of varying stiffness.
  • Characterization of matrix properties (stiffness, viscoelasticity, fiber size, fiber volume) using rheometry, SEM, and SHG imaging.
  • Measurement of membrane fluidity using the fluorescent dye LAURDAN and spectral phasor analysis.

Main Results:

  • Increased collagen matrix stiffness led to a higher proportion of densely packed lipid domains in the plasma membrane.
  • Alterations in membrane fluidity distribution were observed after 24 or 72 hours of cell culture.
  • Matrix stiffness directly influences the organization of plasma membrane fluidity domains.

Conclusions:

  • Changes in plasma membrane fluidity domain equilibrium serve as a mechanism for cells to sense and respond to mechanical cues from the extracellular matrix.
  • This study highlights the plasma membrane's crucial role in cellular adaptation to matrix structural composition.
  • Findings suggest a versatile signaling pathway linking matrix mechanics to cellular responses.