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An anti-inflammatory phenotype in visceral adipose tissue of old lean mice, augmented by exercise

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  • A K Ziegler
  • A Damgaard
  • A L Mackey
  • P Schjerling
  • P Magnusson
  • A T Olesen
  • M Kjaer
  • C Scheele
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Visceral adipose tissue is an immunogenic tissue, which turns detrimental during obesity by activation of proinflammatory macrophages. During aging, chronic inflammation increases proportional to visceral adipose tissue (VAT) mass and associates with escalating morbidity and mortality. Here, we utilize a mouse model to investigate the inflammatory status of visceral adipose tissue in lean aging mice and assess the effects of exercise training interventions. We randomized adult (11 months; n = 21) and old (23 months; n = 27) mice to resistance training (RT) or endurance training (ET), or to a sedentary control group (S). Strikingly, we observed an anti-inflammatory phenotype in the old mice, consisting of higher accumulation of M2 macrophages and IL-10 expression, compared to the adult mice. In concordance, old mice also had less VAT mass and smaller adipocytes compared to adult mice. In both age groups, exercise training enhanced the anti-inflammatory phenotype and increased PGC1-α mRNA expression. Intriguingly, the brown adipose tissue marker UCP1 was modestly higher in old mice, while remained unchanged by the intervention. In conclusion, in the absence of obesity, visceral adipose tissue possesses a pronounced anti-inflammatory phenotype during aging which is further enhanced by exercise.

OriginalsprogEngelsk
TidsskriftScientific Reports
Vol/bind9
Udgave nummer1
Sider (fra-til)12069
ISSN2045-2322
DOI
StatusUdgivet - 19 aug. 2019

ID: 59363213