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  Gut microbiota shape ‘inflamm-ageing’ cytokines and account for age-dependent decline in DNA damage repair

Guedj, A., Volman, Y., Geiger-Maor, A., Bolik, J., Schumacher, N., Künzel, S., et al. (2019). Gut microbiota shape ‘inflamm-ageing’ cytokines and account for age-dependent decline in DNA damage repair. Gut. doi:10.1136/gutjnl-2019-318491.

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 Creators:
Guedj, Avital, Author
Volman, Yael, Author
Geiger-Maor, Anat, Author
Bolik, Julia, Author
Schumacher, Neele, Author
Künzel, Sven1, Author              
Baines, John F.2, Author              
Nevo, Yuval, Author
Elgavish, Sharona, Author
Galun, Eithan, Author
Amsalem, Hagai, Author
Schmidt-Arras, Dirk, Author
Rachmilewitz, Jacob, Author
Affiliations:
1Department Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445635              
2Guest Group Evolutionary Genomics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445638              

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 Abstract: Objective Failing to properly repair damaged DNA drives the ageing process. Furthermore, age-related inflammation contributes to the manifestation of ageing. Recently, we demonstrated that the efficiency of repair of diethylnitrosamine (DEN)-induced double-strand breaks (DSBs) rapidly declines with age. We therefore hypothesised that with age, the decline in DNA damage repair stems from age-related inflammation.Design We used DEN-induced DNA damage in mouse livers and compared the efficiency of their resolution in different ages and following various permutations aimed at manipulating the liver age-related inflammation.Results We found that age-related deregulation of innate immunity was linked to altered gut microbiota. Consequently, antibiotic treatment, MyD88 ablation or germ-free mice had reduced cytokine expression and improved DSBs rejoining in 6-month-old mice. In contrast, feeding young mice with a high-fat diet enhanced inflammation and facilitated the decline in DSBs repair. This latter effect was reversed by antibiotic treatment. Kupffer cell replenishment or their inactivation with gadolinium chloride reduced proinflammatory cytokine expression and reversed the decline in DSBs repair. The addition of proinflammatory cytokines ablated DSBs rejoining mediated by macrophage-derived heparin-binding epidermal growth factor-like growth factor.Conclusions Taken together, our results reveal a previously unrecognised link between commensal bacteria-induced inflammation that results in age-dependent decline in DNA damage repair. Importantly, the present study support the notion of a cell non-autonomous mechanism for age-related decline in DNA damage repair that is based on the presence of ‘inflamm-ageing’ cytokines in the tissue microenvironment, rather than an intrinsic cellular deficiency in the DNA repair machinery.

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Language(s): eng - English
 Dates: 2019-09-122019-02-172019-09-122019-10-052019-10
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1136/gutjnl-2019-318491
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Title: Gut
  Other : Gut
Source Genre: Journal
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Publ. Info: London : BMJ Publishing Group
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: Other: 1468-3288
ISSN: 0017-5749
CoNE: https://pure.mpg.de/cone/journals/resource/954925402606