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Related Experiment Videos

Eosinophilic inflammation in asthma.

J Bousquet1, P Chanez, J Y Lacoste

  • 1Clinique des Maladies Respiratoires, Hôpital l'Aiguelongue, Montpellier, France.

The New England Journal of Medicine
|October 11, 1990
PubMed
Summary
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Eosinophilic inflammation in asthma is linked to disease severity. Degranulated eosinophils in the airways may contribute to epithelial damage in asthma patients.

Area of Science:

  • Pulmonology
  • Immunology
  • Pathology

Background:

  • The role of eosinophils in asthma pathogenesis remains unclear.
  • Asthma severity is assessed via clinical scores and pulmonary function tests.

Purpose of the Study:

  • To evaluate the role of eosinophilic inflammation in bronchial asthma.
  • To correlate eosinophil presence and activity with asthma severity.

Main Methods:

  • Compared eosinophil counts in blood, bronchoalveolar lavage fluid, and bronchial biopsies from asthma patients and controls.
  • Measured eosinophil cationic protein (ECP) levels using radioimmunoassay and immunohistochemistry.

Main Results:

  • Increased peripheral blood eosinophils correlated with asthma severity and impaired pulmonary function.

Related Experiment Videos

  • Elevated eosinophils and ECP in bronchoalveolar lavage fluid also correlated with asthma severity.
  • Intraepithelial eosinophils were unique to asthma patients; degranulated eosinophils were found beneath the basement membrane and among epithelial cells.

    • Conclusions:

    • Airway eosinophilic inflammation is associated with asthma severity.
    • Degranulated eosinophils likely contribute to epithelial damage observed in asthma.