DNA Damage Signaling Instructs Polyploid Macrophage Fate in Granulomas
- PMID: 28084216
- DOI: 10.1016/j.cell.2016.09.054
DNA Damage Signaling Instructs Polyploid Macrophage Fate in Granulomas
Erratum in
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DNA Damage Signaling Instructs Polyploid Macrophage Fate in Granulomas.Cell. 2018 Aug 23;174(5):1325-1326. doi: 10.1016/j.cell.2018.08.015. Cell. 2018. PMID: 30142346 No abstract available.
Abstract
Granulomas are immune cell aggregates formed in response to persistent inflammatory stimuli. Granuloma macrophage subsets are diverse and carry varying copy numbers of their genomic information. The molecular programs that control the differentiation of such macrophage populations in response to a chronic stimulus, though critical for disease outcome, have not been defined. Here, we delineate a macrophage differentiation pathway by which a persistent Toll-like receptor (TLR) 2 signal instructs polyploid macrophage fate by inducing replication stress and activating the DNA damage response. Polyploid granuloma-resident macrophages formed via modified cell divisions and mitotic defects and not, as previously thought, by cell-to-cell fusion. TLR2 signaling promoted macrophage polyploidy and suppressed genomic instability by regulating Myc and ATR. We propose that, in the presence of persistent inflammatory stimuli, pathways previously linked to oncogene-initiated carcinogenesis instruct a long-lived granuloma-resident macrophage differentiation program that regulates granulomatous tissue remodeling.
Keywords: DNA damage; granulomas; inflammation; macrophages; mycobacteria; replication stress; tuberculosis.
Copyright © 2016 Elsevier Inc. All rights reserved.
Comment in
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Macrophages: Granuloma macrophage differentiation.Nat Rev Immunol. 2016 Nov 25;16(12):718-719. doi: 10.1038/nri.2016.132. Nat Rev Immunol. 2016. PMID: 27885281 No abstract available.
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