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Related Experiment Videos

Induced sputum eicosanoid concentrations in asthma.

I D Pavord1, R Ward, G Woltmann

  • 1Department of Respiratory Medicine and Thoracic Surgery, Glenfield Hospital, Leicester, United Kingdom. trina.raftery@glenfield-tr.trent.nhs.uk

American Journal of Respiratory and Critical Care Medicine
|December 10, 1999
PubMed
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Induced sputum analysis reveals higher leukotriene levels in asthma patients, aiding noninvasive assessment. Prostaglandin E2 may have an anti-inflammatory role in asthma.

Area of Science:

  • Pulmonary Medicine
  • Inflammation Research
  • Biomarker Discovery

Background:

  • Asthma management requires noninvasive methods to assess airway inflammation.
  • Leukotrienes (LT) and prostaglandins (PG) are key inflammatory mediators in asthma.
  • Induced sputum supernatant is a potential source for measuring airway eicosanoids.

Purpose of the Study:

  • To define the role of leukotrienes and prostaglandins in asthma.
  • To validate induced sputum supernatant as a method for measuring airway eicosanoids.
  • To compare eicosanoid levels in asthma patients and healthy individuals.

Main Methods:

  • Measured sputum supernatant concentrations of cysteinyl-leukotrienes (LTC4/D4/E4) via enzyme immunoassay.
  • Quantified prostaglandins (PGE2, PGD2, TXB2, PGF2alpha) using gas chromatography-mass spectrometry.

Related Experiment Videos

  • Analyzed samples from 26 asthma patients and 10 healthy controls.

    • Main Results:

    • Significantly higher sputum cysteinyl-leukotriene concentrations in asthma patients compared to controls (9.5 vs. 6.4 ng/ml).
    • Elevated leukotriene levels observed in persistent asthma and during acute exacerbations.
    • Negative correlation between sputum eosinophil percentage and PGE2 concentration in asthma patients (r = -0.48).

    Conclusions:

    • Induced sputum is a valuable source of eicosanoids.
    • Sputum cysteinyl-leukotriene levels are elevated in asthma.
    • PGE2 may possess anti-inflammatory properties in asthma, indicated by its inverse relationship with eosinophilic inflammation.