Dataset Information

Neutrophil phenotypes in bronchial airways differentiate single from dual responding allergic asthmatics.

ABSTRACT:

Introduction

Allergic asthmatics with both an early (EAR) and a late allergic reaction (LAR) following allergen exposure are termed 'dual responders' (DR), while 'single responders' (SR) only have an EAR. Mechanisms that differentiate DR from SR are largely unknown, particularly regarding the role and phenotypes of neutrophils. Therefore, we aimed to study neutrophils in DR and SR asthmatics.

Methods

Thirty-four allergic asthmatics underwent an inhaled allergen challenge, samples were collected before and up to 24 h post-challenge. Cell differentials were counted from bronchial lavage, alveolar lavage and blood; and tissue neutrophils were quantified in immune-stained bronchial biopsies. Lavage neutrophil nuclei lobe segmentation was used to classify active (1-4 lobes) from suppressive neutrophils (≥5 lobes). Levels of transmigration markers: soluble (s)CD62L and interleukin-1Ra, and activity markers: neutrophil elastase (NE), DNA-histone complex and dsDNA were measured in lavage fluid and plasma.

Results

Compared with SR at baseline, DR had more neutrophils in their bronchial airways at baseline, both in the lavage (p = .0031) and biopsies (p = .026) and elevated bronchial neutrophils correlated with less antitransmigratory IL-1Ra levels (r = -0.64). DR airways had less suppressive neutrophils and more 3-lobed (active) neutrophils (p = .029) that correlated with more bronchial lavage histone (p = .020) and more plasma NE (p = .0016). Post-challenge, DR released neutrophil extracellular trap factors in the blood earlier and had less pro-transmigratory sCD62L during the late phase (p = .0076) than in SR.

Conclusion

DR have a more active airway neutrophil phenotype at baseline and a distinct neutrophil response to allergen challenge that may contribute to the development of an LAR. Therefore, neutrophil activity should be considered during targeted diagnosis and bio-therapeutic development for DR.

SUBMITTER: van der Burg N

PROVIDER: S-EPMC10083921 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature

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Publications

Neutrophil phenotypes in bronchial airways differentiate single from dual responding allergic asthmatics.

van der Burg Nicole N Stenberg Henning H Ekstedt Sandra S Diamant Zuzana Z Bornesund Daisy D Ankerst Jaro J Kumlien Georén Susanna S Cardell Lars-Olaf LO Bjermer Leif L Erjefält Jonas J Tufvesson Ellen E

Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology 20220428 1

<h4>Introduction</h4>Allergic asthmatics with both an early (EAR) and a late allergic reaction (LAR) following allergen exposure are termed 'dual responders' (DR), while 'single responders' (SR) only have an EAR. Mechanisms that differentiate DR from SR are largely unknown, particularly regarding the role and phenotypes of neutrophils. Therefore, we aimed to study neutrophils in DR and SR asthmatics.<h4>Methods</h4>Thirty-four allergic asthmatics underwent an inhaled allergen challenge, samples ...[more]

PMID: 35437872

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Dataset Information

Neutrophil phenotypes in bronchial airways differentiate single from dual responding allergic asthmatics.

Introduction

Methods

Results

Conclusion

Publications

Neutrophil phenotypes in bronchial airways differentiate single from dual responding allergic asthmatics.

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