Abstract
β-Glucan-induced trained immunity in myeloid cells leads to long-term protection against secondary infections. Although previous studies have characterized this phenomenon, strategies to boost trained immunity remain undefined. We found that β-glucan-trained macrophages from mice with a myeloid-specific deletion of the phosphatase SHIP-1 (LysMΔSHIP-1) showed enhanced proinflammatory cytokine production in response to lipopolysaccharide. Following β-glucan training, SHIP-1-deficient macrophages exhibited increased phosphorylation of Akt and mTOR targets, correlating with augmented glycolytic metabolism. Enhanced training in the absence of SHIP-1 relied on histone methylation and acetylation. Trained LysMΔSHIP-1 mice produced increased amounts of proinflammatory cytokines upon rechallenge in vivo and were better protected against Candida albicans infection compared with control littermates. Pharmacological inhibition of SHIP-1 enhanced trained immunity against Candida infection in mouse macrophages and human peripheral blood mononuclear cells. Our data establish proof of concept for improvement of trained immunity and a strategy to achieve it by targeting SHIP-1. Trained immunity leads to long-term protection, but strategies to boost it require further investigation. Saz-Leal et al. show that myeloid SHIP-1 deletion enhances trained immunity, improving the response to pathogen-specific or heterologous challenges. Pharmacological inhibition of SHIP-1 also potentiates this phenomenon, thereby revealing a potential tool to harness trained immunity.
Original language | English (US) |
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Pages (from-to) | 1118-1126 |
Number of pages | 9 |
Journal | Cell Reports |
Volume | 25 |
Issue number | 5 |
DOIs | |
State | Published - Oct 30 2018 |
Keywords
- SHIP-1
- glycolytic metabolism
- innate immune memory
- myeloid
- trained immunity
ASJC Scopus subject areas
- General Biochemistry, Genetics and Molecular Biology