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Journal Article

Macrophages acquire a TNF-dependent inflammatory memory in allergic asthma

MPS-Authors

Kabat,  Agnieszka M
Department Immunometabolism, Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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Pearce,  Edward Jonathen
Department Immunometabolism, Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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https://www.sciencedirect.com/science/article/pii/S009167492102741X?via%3Dihub
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10.1016_j.jaci.2021.11.026.pdf
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Citation

Lechner, A., Henkel, F. D. R., Hartung, F., Bohnacker, S., Alessandrini, F., Gubernatorova, E. O., et al. (2021). Macrophages acquire a TNF-dependent inflammatory memory in allergic asthma. The journal of allergy and clinical immunology: official publication of the American Academy of Allergy, Asthma and Immunology, 149, 2078-2090. doi:10.1016/j.jaci.2021.11.026.


Cite as: https://hdl.handle.net/21.11116/0000-000D-15E1-D
Abstract
Background: Infectious agents can reprogram or "train" macrophages and their progenitors to respond more readily to subsequent insults. However, whether such an inflammatory memory exists in type 2 inflammatory conditions such as allergic asthma was not known.

Objective: We sought to decipher macrophage-trained immunity in allergic asthma.

Methods: We used a combination of clinical sampling of house dust mite (HDM)-allergic patients, HDM-induced allergic airway inflammation in mice, and an in vitro training setup to analyze persistent changes in macrophage eicosanoid, cytokine, and chemokine production as well as the underlying metabolic and epigenetic mechanisms. Transcriptional and metabolic profiles of patient-derived and in vitro trained macrophages were assessed by RNA sequencing or metabolic flux analysis and liquid chromatography-tandem mass spectrometry analysis, respectively.

Results: We found that macrophages differentiated from bone marrow or blood monocyte progenitors of HDM-allergic mice or asthma patients show inflammatory transcriptional reprogramming and excessive mediator (TNF-α, CCL17, leukotriene, PGE2, IL-6) responses upon stimulation. Macrophages from HDM-allergic mice initially exhibited a type 2 imprint, which shifted toward a classical inflammatory training over time. HDM-induced allergic airway inflammation elicited a metabolically activated macrophage phenotype, producing high amounts of 2-hydroxyglutarate (2-HG). HDM-induced macrophage training in vitro was mediated by a formyl peptide receptor 2-TNF-2-HG-PGE2/PGE2 receptor 2 axis, resulting in an M2-like macrophage phenotype with high CCL17 production. TNF blockade by etanercept or genetic ablation of Tnf in myeloid cells prevented the inflammatory imprinting of bone marrow-derived macrophages from HDM-allergic mice.

Conclusion: Allergen-triggered inflammation drives a TNF-dependent innate memory, which may perpetuate and exacerbate chronic type 2 airway inflammation and thus represents a target for asthma therapy.