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Related Experiment Videos

In vivo airway surface liquid Cl- analysis with solid-state electrodes.

Ray A Caldwell1, Barbara R Grubb, Robert Tarran

  • 1Cystic Fibrosis/Pulmonary Research and Treatment Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA. ray_caldwell@med.unc.edu

The Journal of General Physiology
|January 5, 2002
PubMed
Summary

This study developed a new electrode to measure chloride levels in airway surface liquid (ASL) in various species. Results show ASL chloride concentrations consistently exceed 100 mM, supporting the isotonic volume hypothesis in cystic fibrosis research.

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Area of Science:

  • Pulmonary Medicine
  • Biomedical Engineering
  • Ion Transport Physiology

Background:

  • Cystic fibrosis (CF) airway pathogenesis is debated, with hypotheses linking CFTR mutations and ion transport defects to lung disease.
  • Alterations in airway surface liquid (ASL) volume or ion composition are considered critical, but in vivo measurement of ASL chloride concentration ([Cl-]) is challenging.
  • Existing data on ASL [Cl-] lacks consensus, hindering the discrimination between different pathogenetic hypotheses.

Purpose of the Study:

  • To develop and validate a miniaturized solid-state electrode for accurate in vivo measurement of ASL [Cl-].
  • To determine ASL [Cl-] across various airway regions and species to inform CF pathogenesis models.

Main Methods:

  • Construction of a miniaturized solid-state electrode with shallow immersion depth for ASL [Cl-] measurement.

Related Experiment Videos

  • Validation of the electrode's accuracy (>93%) using physiologic salt solutions, small-volume test solutions, and in vitro cell culture models.
  • In vivo measurement of ASL [Cl-] in human nasal cavity, rabbit and monkey tracheobronchial regions, mouse trachea, and small airways of rabbit and monkey.

    • Main Results:

    • The developed electrode demonstrated high accuracy in controlled experimental settings.
    • ASL [Cl-] in normal human nasal cavity averaged 117.3 mM.
    • Consistently high ASL [Cl-] values (exceeding 100 mM) were measured across all tested airway regions and species, including rabbit, mouse, and monkey.

    Conclusions:

    • The in vivo measurements confirm that ASL [Cl-] is consistently elevated across multiple species and airway locations.
    • These findings support the isotonic volume hypothesis as a key aspect of ASL physiology in health and potentially in CF.
    • The developed electrode provides a valuable tool for future research into airway surface liquid dynamics and cystic fibrosis pathogenesis.