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Normalizing salt content by mixing native human airway mucus samples normalizes sample rheology.

Matthew R Markovetz1, Jacob E Hibbard1, Lucas M Plott1

  • 1Marsico Lung Institute, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States.

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|March 27, 2023
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Summary

Researchers developed a method to improve native airway mucus samples from endotracheal tubes (ETT). This technique enhances mucus for studying muco-obstructive pulmonary diseases (MOPDs) and developing new treatments.

Keywords:
airway physiologymuco-obstructive pulmonary diseasesmucusmucus rheologyparticle tracking microrheology

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Area of Science:

  • Pulmonary Medicine
  • Biophysics
  • Biochemistry

Background:

  • Millions suffer from muco-obstructive pulmonary diseases (MOPDs), characterized by hyperconcentrated airway mucus.
  • Effective research into MOPDs requires reliable sources of native airway mucus for study and manipulation.
  • Endotracheal tube (ETT) mucus offers advantages over sputum or cell cultures but often has altered composition.

Purpose of the Study:

  • To determine the biochemical composition of ETT mucus from healthy subjects.
  • To establish a methodology for restoring and increasing the yield of native airway mucus samples.
  • To investigate the impact of salt concentration on mucus rheology.

Main Methods:

  • Biochemical characterization of ETT mucus samples.
  • Restoration of ETT mucus to normal tonicity.
  • Rheological analysis of salt-normalized and isotonic mucus.

Main Results:

  • Biochemical composition of ETT mucus was determined.
  • Salt-normalized ETT mucus demonstrated concentration-dependent rheologic properties similar to isotonic mucus.
  • The rheology of ETT mucus was consistent across spatial scales and with prior research.

Conclusions:

  • Salt concentration significantly influences mucus rheology.
  • The presented methodology provides a reliable way to obtain and manipulate native airway mucus for MOPD research.
  • This work supports the use of ETT mucus as a valuable resource for pulmonary research.