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Neonatal eosinophils possess efficient Eotaxin/IL-5- and N-formyl-methionyl-leucyl-phenylalanine-induced
Ali Moshfegh1, Carina Lothian, Gunilla Halldén
1Department of Medicine, Division of Clinical Immunology and Allergy, Karolinska Institutet and Hospital, Solna, SE-171 76 Stockholm, Sweden. ali.moshfegh@cck.ki.se
Insights
Neonatal eosinophils exhibit enhanced transmigration and receptor expression compared to adults, suggesting a distinct role in early life immunity. This study highlights key differences in immune cell function during the neonatal period.
Area of Science:
- Immunology
- Neonatal Biology
- Cellular Biology
Background:
- Premature infants often show eosinophilia and altered eosinophil trafficking post-birth.
- Understanding neonatal immune responses is crucial for managing infant health.
Purpose of the Study:
- To compare the in vitro transmigration of neonatal and adult eosinophils.
- To investigate eosinophil response to bacterial and allergic inflammation mimics.
- To analyze the expression of key receptors and adhesion molecules.
Main Methods:
- In vitro eosinophil transmigration assay.
- Chemotactic stimuli: N-formyl-methionyl-leucyl-phenylalanine (fMLP) and IL-5/eotaxin.
- Flow cytometry for CD11b and fMLP receptor expression analysis.
Main Results:
- Neonatal eosinophils showed significantly higher transmigration efficiency towards fMLP and IL-5/eotaxin compared to adults.
- Increased expression of the fMLP receptor and CD11b was observed on neonatal eosinophils.
- These findings indicate enhanced migratory and activation potential in neonatal eosinophils.
Conclusions:
- Neonatal eosinophils possess a heightened capacity for transmigration and express higher levels of fMLP receptors and CD11b.
- These characteristics suggest neonatal eosinophils may have a unique functional role in early postnatal life, distinct from adult eosinophils.
Abstract:
The majority of premature infants develop eosinophilia and abnormalities in eosinophil trafficking during the first period of postnatal life. We therefore thought to assess the ability of neonatal eosinophils to transmigrate in vitro toward chemotactic stimuli mimic either bacterial infections, or to allergic inflammation in vivo, and to compare the results with eosinophils in adults. We used an in vitro transmigration method and the chemotactic stimuli N-formyl-methionyl-leucyl-phenylalanine (fMLP) or a combination of IL-5 and eotaxin. The expression of the adhesion-promoting molecule CD11b and the fMLP receptor were assessed by flow cytometry. Both the fMLP- and IL5/eotaxin-induced eosinophil transmigration capacity was significantly more efficient in neonates than in adults (p < 0.0001 and p < 0.0002, respectively). The fMLP-induced up-regulation of CD11b on eosinophils was significantly (p < 0.0003) higher in neonates compared with that in adults. We also assessed a significant (p < 0.0001) higher expression of the fMLP receptor on resting eosinophils in neonates compared with that in adults. The integrated impact of increased transmigration capacity, fMLP receptor expression, and CD11b expression on eosinophil by bacterial peptide fMLP suggests that neonatal eosinophils possess the potential to play an alternative role compared with eosinophils in adults.
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