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• W2971243228 abstract "Macrophage effector function is dynamic in nature and largely dependent on not only the type of immunological challenge but also the tissue-specific environment and developmental origin of a given macrophage population. Recent research has highlighted the importance of glycolytic metabolism in the regulation of effector function as a common feature associated with macrophage activation. Yet, most research has used macrophage cell lines and bone marrow-derived macrophages, which do not account for the diversity of macrophage populations and the role of tissue specificity in macrophage immunometabolism. Tissue-resident alveolar macrophages (TR-AMs) reside in an environment characterized by remarkably low glucose concentrations, making glycolysis-linked immunometabolism an inefficient and unlikely means of immune activation. In this study, we show that TR-AMs rely on oxidative phosphorylation to meet their energy demands and maintain extremely low levels of glycolysis under steady-state conditions. Unlike bone marrow-derived macrophages, TR-AMs did not experience enhanced glycolysis in response to LPS, and glycolytic inhibition had no effect on their proinflammatory cytokine production. Hypoxia-inducible factor 1α stabilization promoted glycolysis in TR-AMs and shifted energy production away from oxidative metabolism at baseline, but it was not sufficient for TR-AMs to mount further increases in glycolysis or enhance immune function in response to LPS. Importantly, we confirmed these findings in an in vivo influenza model in which infiltrating macrophages had significantly higher glycolytic and proinflammatory gene expression than TR-AMs. These findings demonstrate that glycolysis is dispensable for macrophage effector function in TR-AM and highlight the importance of macrophage tissue origin (tissue resident vs. recruited) in immunometabolism." @default.
• W2971243228 created "2019-09-05" @default.
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• W2971243228 date "2020-02-01" @default.
• W2971243228 modified "2023-10-18" @default.
• W2971243228 title "Tissue-Resident Alveolar Macrophages Do Not Rely on Glycolysis for LPS-induced Inflammation" @default.
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• W2971243228 doi "https://doi.org/10.1165/rcmb.2019-0244oc" @default.
• W2971243228 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6993551" @default.
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