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Identification and Characterization of Immunogenic RNA Species in HDM Allergens that Modulate Eosinophilic Lung Inflammation
Published on: May 30, 2020
Eosinophil cationic protein alters pulmonary surfactant structure and function in asthma
Jens M Hohlfeld1, Andreas Schmiedl, Veit J Erpenbeck
1Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany.
The Journal of Allergy and Clinical Immunology
|March 10, 2004
Summary
Eosinophil cationic protein (ECP) impairs lung surfactant function in asthma patients. Elevated ECP levels correlate with reduced surfactant function and structural changes, potentially causing airway obstruction.
Area of Science:
- Pulmonary Medicine
- Immunology
- Biochemistry
Background:
- Asthma is associated with impaired lung surfactant function.
- Eosinophils release eosinophil cationic protein (ECP), a potential mediator of surfactant dysfunction.
- The role of ECP in surfactant inhibition is not well understood.
Purpose of the Study:
- To investigate the correlation between ECP levels in bronchoalveolar lavage fluid (BALF) and surfactant dysfunction in asthma patients post-allergen challenge.
- To determine the in vitro effects of purified ECP on surfactant function and structure.
Main Methods:
- Surfactant biophysical function assessed using Pulsating Bubble and Capillary Surfactometers.
- Correlation analysis of surfactant function with ECP levels in BALF.
- In vitro incubation of natural surfactant with purified ECP and plasma proteins, followed by functional and structural analysis.
Main Results:
- ECP levels were elevated in asthmatic patients after allergen challenge.
- ECP levels correlated with surfactant dysfunction.
- In vitro, ECP inhibited surfactant function and altered surfactant structure in a concentration-dependent manner, more potently than albumin or fibrinogen.
Conclusions:
- ECP contributes to surfactant dysfunction in asthma.
- This dysfunction may lead to airway obstruction in asthmatic patients.
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