Eosinophilic Cell Mechanisms in Allergic Inflammation

Allergic inflammation is underpinned by the orchestrated recruitment, activation and effector functions of eosinophils. These granulocytes, derived from bone marrow under the influence of interleukin-5 (IL-5) and other growth factors, home to mucosal tissues in response to chemokines such as eotaxins. Upon arrival, eosinophils undergo degranulation, releasing cytotoxic proteins (major basic protein, eosinophil peroxidase) that damage epithelium and amplify inflammation. In parallel, they generate extracellular traps—web-like DNA structures studded with granule proteins—that capture pathogens but may also propagate tissue remodelling. Single-cell analyses have revealed that tissue-resident and recruited eosinophil subsets exhibit distinct transcriptomic programmes, modulating local immune networks and stromal cell behaviour. Metabolic adaptations, notably in mitochondrial respiration and lipid catabolism, support eosinophil survival in hypoxic niches. Cross-talk with innate lymphoid cells, mast cells and T helper type-2 lymphocytes sustains a self-reinforcing type-2 milieu, while neuroimmune interactions amplify mucosal hyperreactivity. Advances in understanding eosinophil heterogeneity and effector pathways have driven targeted therapies—anti-IL-5 and anti-IL-5-receptor monoclonal antibodies—that attenuate tissue eosinophilia and improve clinical outcomes in asthma and eosinophilic oesophagitis. Ongoing research seeks to refine biomarkers of activation states and explore adjunctive strategies to resolve chronic allergic pathology.

Research from Nature Portfolio

Single-cell transcriptomics in bronchial biopsy specimens has delineated discrete eosinophil states, revealing a pro-remodelling subset enriched for genes governing extracellular matrix turnover and angiogenesis. This work has illuminated mechanisms by which eosinophils shape airway architecture in chronic asthma. Another study has demonstrated that eosinophil extracellular trap formation is regulated by autocrine leukotriene signalling, identifying 5-lipoxygenase as a potential therapeutic target to restrain aberrant trap generation in atopic dermatitis. A further investigation has characterised the immunometabolic circuitry that sustains eosinophil longevity in inflamed lung tissue, highlighting a reliance on fatty-acid oxidation under cytokine-limiting conditions and suggesting that metabolic inhibition may promote resolution of eosinophil-driven inflammation.

Eosinophilic Cell Mechanisms in Allergic Inflammation publication trend

The graph below shows the total number of articles in eosinophilic cell mechanisms in allergic inflammation across all publications each year (not limited to Nature Index journals).

Technical terms

Eosinophil: A type of white blood cell containing cytotoxic granules, central to type-2 immune responses and allergic pathology.

Interleukin-5 (IL-5): A cytokine that promotes eosinophil proliferation, differentiation and survival.

Degranulation: The process by which eosinophils release stored cytotoxic proteins into the extracellular space.

Extracellular trap: A meshwork of DNA and granule proteins expelled by activated granulocytes to ensnare pathogens.

Chemokine: A small chemoattractant protein that guides leucocyte migration to sites of inflammation.

References

1. The Unified Airway Hypothesis: Evidence From Specific Intervention With Anti–IL-5 Biologic Therapy. The Journal of Allergy and Clinical Immunology In Practice (2023).
2. Expression of IL-5 receptor alpha by murine and human lung neutrophils. PLOS ONE (2019).