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Bacterial skin infection primes bone marrow eosinophils to promote allergic skin-lung crosstalk

GSE287520 Mus musculus Genome binding/occupancy profiling by high throughput sequencing 8 samples Submitted 2025/02/12 Platform GPL24247
Summary
Microbial exposure at barrier interfaces drives development and balance of the immune system, but the consequences of local infections for systemic immunity and secondary inflammation are unclear. Here, we show that dermal exposure to the bacterium Staphylococcus aureus persistently shapes the immune system of mice with specific impact on progenitor and mature bone marrow neutrophil and eosinophil populations. The infection-imposed changes in eosinophils were long-lasting with functional changes associated with epigenetic and metabolic reprogramming, indicative of trained immunity. Bacterial exposure enhanced dermal allergic sensitization and resulted in exacerbated allergen-induced lung inflammation. S. aureus-mediated reprogramming of bone marrow eosinophils was driven by the alarmin interleukin 33 and the complement cleavage fragment C5a. Our study highlights the systemic impact of skin inflammation and reveals eosinophil progenitor training and organ-crosstalk mechanisms that modulate systemic responses to allergens.
Published in
Eosinophil innate immune memory after bacterial skin infection promotes allergic lung inflammation
Radhouani M, Farhat A, Hakobyan A et al. · Science immunology 2025 · PMID 40184438 · doi:10.1126/sciimmunol.adp6231
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Also filed as BioProject PRJNA1213137 and SRA study SRP558562. Searching any of these in the dataset finder brings you back here.

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