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Related Experiment Videos

Sputum processing for evaluation of inflammatory mediators.

J S Kim1, G H Hackley, K Okamoto

  • 1Department of Pediatrics, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, USA.

Pediatric Pulmonology
|July 31, 2001
PubMed
Summary

Cystic Fibrosis (CF) airways show higher levels of interleukin-8, myeloperoxidase, and deoxyribonucleic acid compared to Chronic Bronchitis (CB). Dornase alfa treatment increased myeloperoxidase in CF sputum, suggesting DNA

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Area of Science:

  • Pulmonary Medicine
  • Inflammation Research
  • Biochemistry

Background:

  • Neutrophil-dominated inflammation is a hallmark of Cystic Fibrosis (CF) and Chronic Bronchitis (CB) airways.
  • Interleukin-8 (IL-8), myeloperoxidase (MPO), and deoxyribonucleic acid (DNA) are key inflammatory mediators in these conditions.

Purpose of the Study:

  • To quantify and compare sputum concentrations of IL-8, MPO, and DNA in CF and CB patients.
  • To investigate the relationships among these inflammatory markers.
  • To explore methodological factors influencing measurements, including the effect of dornase alfa.

Main Methods:

  • Sputum samples from 31 patients were processed using phosphate-buffered saline, dithiothreitol (DTT), or dornase alfa.
  • IL-8 and MPO concentrations were measured via enzyme-linked immunosorbent assay (ELISA).

Related Experiment Videos

  • DNA levels were determined using microfluorimetry.

    • Main Results:

    • Significantly higher concentrations of MPO, IL-8, and DNA were found in CF sputum compared to CB sputum (P < 0.0001 for MPO and DNA; P = 0.0002 for IL-8).
    • A significant positive correlation was observed among sputum IL-8, MPO, and DNA levels.
    • In vitro dornase alfa treatment approximately doubled MPO concentration in CF sputum (P < 0.0001).

    Conclusions:

    • CF airways exhibit a heightened inflammatory state characterized by elevated IL-8, MPO, and DNA compared to CB.
    • These inflammatory markers are interrelated in sputum.
    • DNA may inhibit MPO activity, and dornase alfa treatment could release this inhibition.