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Antibody diffusion in human cervical mucus

W M Saltzman1, M L Radomsky, K J Whaley

  • 1Department of Chemical Engineering, Johns Hopkins University, Baltimore, MD 21218.

Biophysical Journal
|February 1, 1994
PubMed
Summary
This summary is machine-generated.

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Secreted antibodies in mucus are crucial for immunity. Contrary to expectations, large molecules like antibodies and even viruses can diffuse readily through cervical mucus, similar to their movement in water.

Area of Science:

  • Immunology
  • Biophysics
  • Materials Science

Background:

  • The mucosal immune system utilizes secreted antibodies to protect against pathogens.
  • Mucus is traditionally viewed as a barrier limiting diffusion to small molecules.
  • Previous studies suggested mucus significantly impedes molecular diffusion.

Purpose of the Study:

  • To investigate the diffusion of antibodies and proteins within human cervical mucus.
  • To determine if mucus impedes the movement of large molecules like immunoglobulins.
  • To estimate the effective pore size of cervical mucus for molecular transport.

Main Methods:

  • Measured diffusion coefficients using fluorescence imaging of concentration profiles (millimeter scale).
  • Measured diffusion coefficients using fluorescence photobleaching recovery (micron scale).

Related Experiment Videos

  • Compared diffusion rates in cervical mucus to diffusion rates in water.

    • Main Results:

    • Antibodies (IgG, IgG fragments, IgA, IgM) diffused rapidly in cervical mucus, with Dmucus/Dwater ratios between 0.7 and 1.0.
    • Diffusion rates were comparable to those in water, indicating relatively unimpeded transport.
    • Estimated hydrodynamic pore size of cervical mucus is approximately 100 nm.

    Conclusions:

    • Human cervical mucus does not significantly impede the diffusion of antibodies and other large proteins.
    • The pore size of cervical mucus allows for the rapid diffusion of molecules and potentially virus-sized particles.
    • Absence of adhesive interactions is key for unimpeded diffusion of particles through mucus.