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Neutrophil ageing is regulated by the microbiome.

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Title: Neutrophil ageing is regulated by the microbiome.
Authors: Zhang, Dachuan, Chen, Grace, Manwani, Deepa, Mortha, Arthur, Xu, Chunliang, Faith, Jeremiah J., Burk, Robert D., Kunisaki, Yuya, Jang, Jung-Eun, Scheiermann, Christoph, Merad, Miriam, Frenette, Paul S.
Source: Nature. 9/24/2015, Vol. 525 Issue 7570, p528-532. 5p. 2 Charts, 12 Graphs.
Subjects: Neutrophils, Microbiota, Blood microbiology, Immune system, Cellular aging
Abstract: Blood polymorphonuclear neutrophils provide immune protection against pathogens, but may also promote tissue injury in inflammatory diseases. Although neutrophils are generally considered to be a relatively homogeneous population, evidence for heterogeneity is emerging. Under steady-state conditions, neutrophil heterogeneity may arise from ageing and replenishment by newly released neutrophils from the bone marrow. Aged neutrophils upregulate CXCR4, a receptor allowing their clearance in the bone marrow, with feedback inhibition of neutrophil production via the IL-17/G-CSF axis, and rhythmic modulation of the haematopoietic stem-cell niche. The aged subset also expresses low levels of L-selectin. Previous studies have suggested that in vitro-aged neutrophils exhibit impaired migration and reduced pro-inflammatory properties. Here, using in vivo ageing analyses in mice, we show that neutrophil pro-inflammatory activity correlates positively with their ageing whilst in circulation. Aged neutrophils represent an overly active subset exhibiting enhanced αMβ2 integrin activation and neutrophil extracellular trap formation under inflammatory conditions. Neutrophil ageing is driven by the microbiota via Toll-like receptor and myeloid differentiation factor 88-mediated signalling pathways. Depletion of the microbiota significantly reduces the number of circulating aged neutrophils and dramatically improves the pathogenesis and inflammation-related organ damage in models of sickle-cell disease or endotoxin-induced septic shock. These results identify a role for the microbiota in regulating a disease-promoting neutrophil subset. [ABSTRACT FROM AUTHOR]
Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Dachuan%22">Zhang, Dachuan</searchLink><br /><searchLink fieldCode="AR" term="%22Chen%2C+Grace%22">Chen, Grace</searchLink><br /><searchLink fieldCode="AR" term="%22Manwani%2C+Deepa%22">Manwani, Deepa</searchLink><br /><searchLink fieldCode="AR" term="%22Mortha%2C+Arthur%22">Mortha, Arthur</searchLink><br /><searchLink fieldCode="AR" term="%22Xu%2C+Chunliang%22">Xu, Chunliang</searchLink><br /><searchLink fieldCode="AR" term="%22Faith%2C+Jeremiah+J%2E%22">Faith, Jeremiah J.</searchLink><br /><searchLink fieldCode="AR" term="%22Burk%2C+Robert+D%2E%22">Burk, Robert D.</searchLink><br /><searchLink fieldCode="AR" term="%22Kunisaki%2C+Yuya%22">Kunisaki, Yuya</searchLink><br /><searchLink fieldCode="AR" term="%22Jang%2C+Jung-Eun%22">Jang, Jung-Eun</searchLink><br /><searchLink fieldCode="AR" term="%22Scheiermann%2C+Christoph%22">Scheiermann, Christoph</searchLink><br /><searchLink fieldCode="AR" term="%22Merad%2C+Miriam%22">Merad, Miriam</searchLink><br /><searchLink fieldCode="AR" term="%22Frenette%2C+Paul+S%2E%22">Frenette, Paul S.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Nature%22">Nature</searchLink>. 9/24/2015, Vol. 525 Issue 7570, p528-532. 5p. 2 Charts, 12 Graphs.
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  Data: Blood polymorphonuclear neutrophils provide immune protection against pathogens, but may also promote tissue injury in inflammatory diseases. Although neutrophils are generally considered to be a relatively homogeneous population, evidence for heterogeneity is emerging. Under steady-state conditions, neutrophil heterogeneity may arise from ageing and replenishment by newly released neutrophils from the bone marrow. Aged neutrophils upregulate CXCR4, a receptor allowing their clearance in the bone marrow, with feedback inhibition of neutrophil production via the IL-17/G-CSF axis, and rhythmic modulation of the haematopoietic stem-cell niche. The aged subset also expresses low levels of L-selectin. Previous studies have suggested that in vitro-aged neutrophils exhibit impaired migration and reduced pro-inflammatory properties. Here, using in vivo ageing analyses in mice, we show that neutrophil pro-inflammatory activity correlates positively with their ageing whilst in circulation. Aged neutrophils represent an overly active subset exhibiting enhanced αMβ2 integrin activation and neutrophil extracellular trap formation under inflammatory conditions. Neutrophil ageing is driven by the microbiota via Toll-like receptor and myeloid differentiation factor 88-mediated signalling pathways. Depletion of the microbiota significantly reduces the number of circulating aged neutrophils and dramatically improves the pathogenesis and inflammation-related organ damage in models of sickle-cell disease or endotoxin-induced septic shock. These results identify a role for the microbiota in regulating a disease-promoting neutrophil subset. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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