Related Experiment Video

Updated: Jul 12, 2026

Rapid Viscoelastic Characterization of Airway Mucus Using a Benchtop Rheometer
08:47

Rapid Viscoelastic Characterization of Airway Mucus Using a Benchtop Rheometer

Published on: April 21, 2022

Particle size determines mucociliary transport mechanisms in normal and cystic fibrosis airways

Michael Scott1,2, Kaleb C Bierstedt1,2, Weijie Du3,2

  • 1Roy J. Carver Department of Biomedical Engineering, College of Engineering, University of Iowa, USA.

Biorxiv : the Preprint Server for Biology
|July 10, 2026
PubMed

Insights

Particle size significantly impacts airway clearance via mucociliary transport (MCT). Larger particles require mucus, while smaller ones do not, and cystic fibrosis (CF) impairs this process.

Area of Science:

  • Pulmonary Science
  • Biomedical Engineering
  • Respiratory Physiology

Background:

  • Microparticles are inhaled daily and cleared by mucociliary transport (MCT).
  • The effect of particle size on MCT is not well understood.
  • Understanding particle clearance is crucial for respiratory health and disease.

Purpose of the Study:

  • To investigate the influence of microparticle size on MCT.
  • To compare MCT in normal versus cystic fibrosis (CF) airways.
  • To examine the effect of methacholine on particle clearance.

Main Methods:

  • Development of a novel trachea-on-a-chip model using pig trachea explants.
  • Preservation of airway structures, mucus secretion, and cilia beating.
  • High-resolution tracking of microparticle motion in controlled environments.

Main Results:

  • In normal airways, 6 µm particles cleared faster than 102 µm particles, which required mucus strands.
  • MCT was reduced in CF airways, but particle size-dependence remained.
  • Methacholine enhanced particle motion in normal airways but not in CF airways.

Conclusions:

  • Two distinct MCT mechanisms exist: mucus-dependent for large particles and mucus-independent for small particles.
  • Cystic fibrosis disrupts both MCT pathways.
  • Particle size and airway condition are critical factors in respiratory clearance.

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