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. 2016 Nov 17;167(5):1264-1280.e18.
doi: 10.1016/j.cell.2016.09.054. Epub 2016 Oct 27.

DNA Damage Signaling Instructs Polyploid Macrophage Fate in Granulomas

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Free article

DNA Damage Signaling Instructs Polyploid Macrophage Fate in Granulomas

Laura Herrtwich et al. Cell. .
Free article

Erratum in

  • DNA Damage Signaling Instructs Polyploid Macrophage Fate in Granulomas.
    Herrtwich L, Nanda I, Evangelou K, Nikolova T, Horn V, Sagar, Erny D, Stefanowski J, Rogell L, Klein C, Gharun K, Follo M, Seidl M, Kremer B, Münke N, Senges J, Fliegauf M, Aschman T, Pfeifer D, Sarrazin S, Sieweke MH, Wagner D, Dierks C, Haaf T, Ness T, Zaiss MM, Voll RE, Deshmukh SD, Prinz M, Goldmann T, Hölscher C, Hauser AE, Lopez-Contreras AJ, Grün D, Gorgoulis V, Diefenbach A, Henneke P, Triantafyllopoulou A. Herrtwich L, et al. 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.

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