Cell Reports (Aug 2021)

Macrophage HIF-2α suppresses NLRP3 inflammasome activation and alleviates insulin resistance

  • Xiaopeng Li,
  • Xiujuan Zhang,
  • Jialin Xia,
  • Linqi Zhang,
  • Bo Chen,
  • Guan Lian,
  • Chuyu Yun,
  • Juan Yang,
  • Yu Yan,
  • Pengcheng Wang,
  • Xuemei Wang,
  • Bo Liu,
  • Huiying Liu,
  • Hui Liang,
  • Yanli Pang,
  • Xian Wang,
  • Changtao Jiang

Journal volume & issue
Vol. 36, no. 8
p. 109607

Abstract

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Summary: The interrelation between hypoxia and immune response has pivotal roles in the pathogenesis of chronic metabolic diseases. However, the role of macrophage HIF-2α in NLRP3 inflammasome activation remains unclear. Here, we show that deficiency of HIF-2α in macrophages results in excessive activation of the NLRP3 inflammasome in a manner dependent on CPT1A-mediated enhancement of fatty acid oxidation (FAO). Mechanistically, HIF-2α binds directly to the Cpt1a promoter and is involved in the regulation of H3K27me3 methylation during NLRP3 inflammasome activation. Myeloid-specific Hif2α knockout mice exhibit exacerbated insulin resistance and increased activation of NLRP3 inflammasome in macrophages. Overexpression of the Hif2α gene or stabilization of the protein by FG-4592 ameliorates insulin resistance and reduces NLRP3 inflammasome activation in macrophages. Taken together, our results suggest that macrophage HIF-2α inhibits FAO-mediated activation of the NLRP3 inflammasome and alleviates insulin resistance.

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