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Eosinophil activation in preterm infants with lung disease
E Berggren Broström1, M Katz-Salamon, J Lundahl
1Department of Pediatrics, Södersjukhuset, Karolinska Institute, Stockholm, Sweden. eva.berggren-brostrom@karolinska.se
Acta Paediatrica (Oslo, Norway : 1992)
|December 26, 2006
Summary
Bronchopulmonary dysplasia (BPD) in preterm infants is linked to eosinophil activation. Eosinophil counts and activity markers were elevated in BPD infants, suggesting a role in disease pathogenesis.
Area of Science:
- Neonatal Medicine
- Pulmonology
- Immunology
Background:
- Bronchopulmonary dysplasia (BPD) is a significant complication in preterm infants.
- The precise mechanisms underlying BPD pathogenesis remain incompletely understood.
- Eosinophils are implicated in various inflammatory lung diseases.
Purpose of the Study:
- To investigate the role of eosinophils in the pathogenesis of BPD in preterm infants.
- To compare eosinophil counts and activation markers between preterm infants with BPD, respiratory distress syndrome (RDS), and healthy controls.
Main Methods:
- Comparative study involving preterm infants with BPD (n=15), RDS (n=13), and healthy controls (n=16).
- Analysis of venous blood samples for total eosinophil and neutrophil counts.
- Measurement of eosinophilic cationic protein (ECP) and CD9 levels as markers of eosinophil activation.
Main Results:
- Significantly higher eosinophil counts were observed in infants with BPD compared to RDS and healthy infants (p=0.03).
- Elevated ECP levels (p=0.002) and reduced CD9 expression (p=0.01) in BPD infants indicate eosinophil activation.
- ECP levels correlated positively with oxygen supplementation duration; eosinophil counts decreased after steroid treatment in BPD infants.
Conclusions:
- Eosinophil activation is associated with bronchopulmonary dysplasia in preterm infants.
- These findings suggest that eosinophils may play a contributory role in the pathogenesis of BPD.
- Further research into eosinophil-targeted therapies for BPD is warranted.
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