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Related Experiment Videos

Localized contact formation by erythrocyte membranes: electrostatic effects

N E Thomas1, W T Coakley

  • 1School of Pure and Applied Biology, University of Wales, Cardiff.

Biophysical Journal
|October 1, 1995
PubMed
Summary

Human erythrocytes adhered by dextran show localized contact points when their surface glycocalices are modified. Electrostatic interactions significantly influence the separation distance between these contact points, as explained by interfacial instability theory.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Surface Chemistry

Background:

  • Human erythrocytes (red blood cells) adhere via a contact seam when exposed to dextran, an uncharged polymer.
  • Electrostatic intermembrane interactions play a crucial role in cell adhesion and can be precisely quantified.

Purpose of the Study:

  • To investigate the topology of the contact seam in human erythrocytes adhered by dextran.
  • To determine the influence of electrostatic intermembrane interactions on cell adhesion patterns.

Main Methods:

  • Examined the contact seam topology of human erythrocytes adhered by dextran.
  • Utilized pronase treatment to modify erythrocyte glycocalices.
  • Varied dextran concentration, molecular mass, and NaCl concentration to observe effects on adhesion.

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Main Results:

  • Normal erythrocytes formed a continuous seam, while pronase-modified cells formed localized contact points.
  • Inter-contact distance (lambda) depended on dextran concentration ([D]) as lambda = C[D]-0.62.
  • Reduced NaCl concentration increased inter-contact distance, indicating electrostatic repulsion's role.

Conclusions:

  • Linear interfacial instability theory quantitatively explains the formation and separation of contact points.
  • Electrostatic interactions are critical in establishing the dominant wavelength and inter-contact distance.
  • Membrane charge layers separated by < 14 nm (bilayer separation of 24 nm) establish the inter-contact distance.