Repetitive exposure of Rag1−/− mice to the Alternaria allergen extract generated a form of memory that elicited an asthma-like response upon a subthreshold recall challenge 3–15 wk later. This memory was associated with lung ICOS+ST2+ ILC2s. Genetic, pharmacologic, and antibody-mediated inhibition and adoptive transfer established an essential role for ILC2s in memory-driven asthma. ATAC-seq demonstrated a distinct epigenetic landscape of memory ILC2s and identified Bach2 and AP1 (JunD and Fosl2) motifs as major drivers of altered gene accessibility. scRNA-seq, gene knockout, and signaling studies suggest that repetitive allergenic stress induces a gene repression program involving Nr4a2, Zeb1, Bach2, and JunD and a preparedness program involving Fhl2, FosB, Stat6, Srebf2, and MPP7 in memory ILC2s. A mutually regulated balance between these two programs establishes and maintains memory. The preparedness program (e.g., Fhl2) can be activated with a subthreshold cognate stimulation, which down-regulates repressors and activates effector pathways to elicit the memory-driven phenotype.
The molecular and epigenetic mechanisms of innate lymphoid cell (ILC) memory and its relevance for asthma
Disclosures: M. Gorska reported a book contract with Springer Nature. The book will describe methods and protocols to study asthma. The book is currently in preparation. No other disclosures were reported.
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Mukesh Verma, Lidia Michalec, Anand Sripada, Jerome McKay, Kapil Sirohi, Divya Verma, Dipa Sheth, Richard Martin, Nathan Dyjack, Max A. Seibold, Jennifer R. Knapp, Ting-Hui Tu, Brian P. O’Connor, Magdalena M. Gorska, Rafeul Alam; The molecular and epigenetic mechanisms of innate lymphoid cell (ILC) memory and its relevance for asthma. J Exp Med 5 July 2021; 218 (7): e20201354. doi: https://doi.org/10.1084/jem.20201354
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