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Van der Waals interactions between cell surfaces

S Nir, M Andersen

    The Journal of Membrane Biology
    |February 24, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Van der Waals interactions between cell surfaces depend on their composition. Changes in cell surface or media components alter interaction magnitudes, impacting cell adhesion and behavior.

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    Area of Science:

    • Biophysics
    • Physical Chemistry

    Background:

    • Cell surfaces feature a plasma membrane and a surface coat.
    • These layers comprise lipids, proteins, sugars, and water.

    Purpose of the Study:

    • To calculate Van der Waals interaction energies between model cell surfaces.
    • To investigate the influence of composition, distance, and thickness on these interactions.

    Main Methods:

    • Derived Van der Waals parameters from refractive indices of solutions.
    • Calculated polarizabilities and Van der Waals parameters for key biomolecules.
    • Modeled cell peripheries as two-layered structures (plasma membrane and surface coat).

    Main Results:

    • Found Van der Waals interaction magnitude follows: water < phospholipid < cholesterol, protein < sugar.

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  • Determined that composition changes in cell surfaces or media alter interaction strength.
  • Calculated Hamaker's coefficients (8 x 10⁻¹⁵ to 6 x 10⁻¹⁴ ergs) and free energies (210-1600 kT/μ²).

    • Conclusions:

    • Cell surface and extracellular medium composition significantly modulate Van der Waals forces.
    • These findings provide insights into cell adhesion mechanisms and biophysical interactions.