Carcinogenesis, Teratogenesis & Mutagenesis ›› 2022, Vol. 34 ›› Issue (4): 247-254,261.doi: 10.3969/j.issn.1004-616x.2022.04.001

   

A mechanistic study on irisin-mediated anti-inflammatory and antioxidant effects in cells

TU Yongmei1,2, YU Weihua2, PENG Jie2, LIU Jiangzheng2, LIU Rui2, WU Hao2, KONG Deqin2, HE Gaihua2, LI Wenli2, WANG Chong1   

  1. 1. School of Public Health, Shaanxi University of Chinese Medicine, Xianyang 712046;
    2. Department of Toxicology, Key Lab of Hazard Assessment and Control in Special Operational Environment of Ministry of Education, Shaanxi Provincial Key Lab of Free Radical Biology and Medicine, School of Public Health, Air Force Medical University, Xi'an 710032, Shaanxi, China
  • Received:2021-12-24 Revised:2022-04-28 Published:2022-08-05

Abstract: OBJECTIVE: To investigate mechanisms of antioxidant and anti-inflammatory effects mediated by Irisin in mouse macrophages RAW264.7. METHODS: RAW264.7 cells were treated with 200 ng/mL Irisin for 0, 24 and 48 h. Real-time PCR was used to detect mRNA expressions of anti-inflammatory factors (IL-10,Arg-1,and CD206),antioxidant genes (HO-1 and SOD2) and PPAR-γ. ELISA assay was used to detect IL-10, Arg-1 in cell supernatants. Commercial kits were used to determine antioxidant enzyme activities,and Western-blot and immunofluorescence to detect Nrf2 and PPAR-γ expression and localization. Furthermore, after 24 h with 100 ng/mL LPS stimulation of RAW264.7 and 4 h 200 ng/mL Irisin pretreatment, real-time PCR was used to detect pro-inflammatory cytokines. DCFH-DA and Mito-LX were used to detect ROS levels. PPAR-γ inhibitor T0070907 (30 μmol/mL) was pretreated for 4 h and 200 ng/mL Irisin for 24 h, real-time PCR was used to detect expressions of anti-inflammatory cytokines. RESULTS: Compared with the untreated cells,Irisin promoted the expression and release of anti-inflammatory factors such as IL-10, Arg-1 and CD206 (P<0.05). However, Irisin inhibited LPS-induced TNF-α and IL-6 mRNA expression (P<0.05), which indicated that Irisin has anti-inflammatory effects. In addition, Nrf2 nuclear translocation occurred after irisin treatment in RAW264.7 cells. Expressions and enzyme activities of HO-1 and SOD2 were significantly enhanced, and the contents of GSH increased (P<0.05). In response to Irisin stimulation, PPAR-γ expression was elevated and underwent nuclear translocation, while PPAR-γ inhibitor T0070907 blocked the Irisin-induced anti-inflammatory response (P<0.05). CONCLUSION: Irisin initiated macrophage M2-type polarization and anti-inflammatory responses through enhancement of PPAR-γ-related anti-inflammatory genes and Nrf2-related antioxidant enzymes. Therefore,Irisin may be a candidate drug for inflammation-related diseases.

Key words: irisin, macrophage, anti-inflammation, antioxidant, PPAR-γ, Nrf2

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