Re-defining the unique roles for eosinophils in allergic respiratory inflammation

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Abstract

Summary: The role of eosinophils in the progression and resolution of allergic respiratory inflammation is poorly defined despite the commonality of their presence and in some cases their use as a biomarker for disease severity and/or symptom control. However, this ambiguity belies the wealth of insights that have recently been gained through the use of eosinophil-deficient/attenuated strains of mice that have demonstrated novel immunoregulatory and remodelling/repair functions for these cells in the lung following allergen provocation. Specifically, studies of eosinophil-deficient mice suggest that eosinophils contribute to events occurring in the lungs following allergen provocation at several key moments: (i) the initiating phase of events leading to Th2-polarized pulmonary inflammation, (ii) the suppression Th1/Th17 pathways in lung-draining lymph nodes, (iii) the recruitment of effector Th2 T cells to the lung, and finally, (iv) mechanisms of inflammatory resolution that re-establish pulmonary homoeostasis. These suggested functions have recently been confirmed and expanded upon using allergen provocation of an inducible eosinophil-deficient strain of mice (iPHIL) that demonstrated an eosinophil-dependent mechanism(s) leading to Th2 dominated immune responses in the presence of eosinophils in contrast to neutrophilic as well as mixed Th1/Th17/Th2 variant phenotypes in the absence of eosinophils. These findings highlighted that eosinophils are not exclusively downstream mediators controlled by T cells, dendritic cells (DC) and/or innate lymphocytic cells (ILC2). Instead, eosinophils appear to be more aptly described as significant contributors in complex interrelated pathways that lead to pulmonary inflammation and subsequently promote resolution and the re-establishment of homoeostatic baseline. In this review, we summarize and put into the context the evolving hypotheses that are now expanding our understanding of the roles eosinophils likely have in the lung following allergen provocation.

Original languageEnglish (US)
Pages (from-to)1119-1136
Number of pages18
JournalClinical and Experimental Allergy
Volume44
Issue number9
DOIs
StatePublished - 2014

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Eosinophils
Inflammation
Lung
Allergens
Pneumonia
T-Lymphocytes
Th2 Cells
Dendritic Cells
Homeostasis
Biomarkers
Lymph Nodes
Phenotype

ASJC Scopus subject areas

  • Immunology
  • Immunology and Allergy

Cite this

Re-defining the unique roles for eosinophils in allergic respiratory inflammation. / Jacobsen, Elizabeth; Lee, Nancy A; Lee, J. J.

In: Clinical and Experimental Allergy, Vol. 44, No. 9, 2014, p. 1119-1136.

Research output: Contribution to journalArticle

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