Globular Adiponectin Exerts a Pro-Inflammatory Effect via IκB/NF-κB Pathway Activation and Anti-Inflammatory Effect by IRAK-1 Downregulation

  • Lee, Kyoung-Hee (Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University Hospital) ;
  • Jeong, Jiyeong (Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University Hospital) ;
  • Woo, Jisu (Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University Hospital) ;
  • Lee, Chang-Hoon (Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University Hospital) ;
  • Yoo, Chul-Gyu (Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University Hospital)
  • Received : 2018.01.02
  • Accepted : 2018.06.20
  • Published : 2018.08.31


Adiponectin, a hormone produced by adipose tissue, is very abundant in plasma, and its anti- and pro-inflammatory effects are reported. However, the mechanisms of these pro- and anti-inflammatory effects are not fully defined. Herein, we evaluated the dual inflammatory response mechanism of adiponectin in macrophages. Short-term globular adiponectin (gAd) treatment induced $I{\kappa}B{\alpha}$ degradation, $NF-{\kappa}B$ nuclear translocation, and $TNF-{\alpha}$ production in RAW 264.7 cells. Polymyxin B pretreatment did not block gAd-induced $I{\kappa}B{\alpha}$ degradation, and heated gAd was unable to degrade $I{\kappa}B{\alpha}$, suggesting that the effects of gAd were not due to endotoxin contamination. gAd activated IKK and Akt, and inhibition of either IKK or Akt by dominant-negative $IKK{\beta}$ ($DN-IKK{\beta}$) or DN-Akt overexpression blocked gAd-induced $I{\kappa}B{\alpha}$ degradation, suggesting that short-term incubation with gAd mediates inflammatory responses by activating the $I{\kappa}B/NF-{\kappa}B$ and PI3K/Akt pathways. Contrastingly, long-term stimulation with gAd induced, upon subsequent stimulation, tolerance to gAd, lipopolysaccharide, and CpG-oligodeoxynucleotide, which is associated with gAd-induced downregulation of IL-receptor-associated kinase-1 (IRAK-1) due to IRAK-1 transcriptional repression. Conclusively, our findings demonstrate that the pro- and anti-inflammatory responses to gAd in innate immune cells are time-dependent, and mediated by the activation of the $I{\kappa}B/NF-{\kappa}B$ pathway, and IRAK-1 downregulation, respectively.


globular adiponection;$NF-{\kappa}B$;IRAK-1


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