China Animal Husbandry and Veterinary Medicine ›› 2023, Vol. 50 ›› Issue (2): 807-816.doi: 10.16431/j.cnki.1671-7236.2023.02.038

• Basic Veterinary Medicine • Previous Articles     Next Articles

Anti-inflammatory and Antioxidant Roles of HO-1 in Macrophages

FU Jingcheng1,2, HE Junhui1,2, TONG Jiang1,2, WU Wei1,2, GUO Shuang1,2, YANG Yanbin1,2, HAN Yingqian1,2, WANG Yueying1,2, LI Heping1,2   

  1. 1. Key Laboratory of Animal Biochemistry and Nutrition, Ministry of Agriculture and Rural Affairs, Henan Agricultural University, Zhengzhou 450046, China;
    2. Key Laboratory of Animal Growth and Development of Henan Province, Zhengzhou 450046, China
  • Received:2022-07-13 Online:2023-02-05 Published:2023-02-06

Abstract: 【Objective】 This study was aim to reveal the anti-inflammatory and antioxidant effects of heme oxygenase-1 (HO-1) in macrophages.【Method】 Different concentrations of lipopolysaccharide (LPS,0,3,5,10,15,20,25 μg/mL),HO-1(0,0.02,0.04,0.06,0.08,0.10 μg/mL) and zinc protoporphyrin (ZPP;0,5,10,15,20,30 ng/mL) respectively were used to treat macrophages (RAW264.7) for 12 hours.The viability of RAW264.7 cells was detected by CCK8 method,and the optimal concentration of RAW264.7 cells treated with LPS,HO-1 and ZPP was calculated. RAW264.7 cells were randomly divided into control group (CT),LPS group (LPS),LPS+HO-1 group (LH),HO-1 group (HO-1),LPS+HO-1+ ZPP group (LHZ),with three replicates in each group.The cells in CT group were seeded in DMEM medium containing 10% fetal bovine serum.The cells in LPS group were treated with LPS.The cells in LH group were treated with LPS and HO-1.The cells in HO-1 group were treated with HO-1.The cells in LHZ group were co-cultured with LPS,HO-1 and ZPP.Cells in each group was treated for 12 hours,collecting the cells and supernatant.The contents of interleukin-6 (IL-6),IL-8,tumor necrosis factor-α (TNF-α), reactive oxygen sepecies (ROS), malondialdehyde (MDA), superoxide dismutase (SOD) and glutathione peroxidase (GPx) in the supernatant were detected by ELISA.The mRNA expression of IL-6,IL-8,TNF-α,nuclear factor-E2-related factor 2 (Nrf2) and HO-1 was measured by quantitative Real-time PCR.The expression of Nrf2,HO-1 protein was detected by Western blotting.【Result】 Compared with cells treated by 0 μg/mL LPS,the concentration of 20 and 25 μg/mL LPS extremely significantly decreased the viability of RAW264.7 cells (P<0.01).Compared with cells treated by 0 μg/mL HO-1,the concentration of 0.08 and 0.10 μg/mL HO-1 extremely significantly increased cell viability (P<0.01).Compared with cells treated by 0 ng/mL,ZPP with 15,20 and 30 ng/mL extremely significantly reduced cell viability (P<0.01).The results showed that the concentration of LPS,HO-1 and ZPP treatment was 20 μg/mL,0.08 μg/mL,15 ng/mL in subsequent experiment,respectively.Compared with CT group,IL-6,IL-8 and TNF-α mRNA expression in LPS group were extremely significantly up-regulated (P<0.01).The contents of IL-6,IL-8,TNF-α,MDA and ROS were extremely significantly increased (P<0.01),and the contents of GPx and SOD were extremely significantly decreased (P<0.01).Compared with LPS group,IL-6,IL-8 and TNF-α mRNA expression in LH group were extremely significantly decreased (P<0.01).The contents of IL-6,IL-8,TNF-α,MDA and ROS were extremely significantly decreased (P<0.01),and the contents of GPx and SOD were extremely significantly increased (P<0.01).Compared with the LH group,IL-6,IL-8 and TNF-α mRNA expression in LHZ group were extremely significantly up-regulated (P<0.01).The content of IL-6,IL-8,TNF-α,MDA and ROS were extremely significantly increased (P<0.01),while the contents of GPx and SOD were extremely significantly decreased (P<0.01).The results of Nrf2/HO-1 signal pathway molecules expression showed that the mRNA and protein expressions of Nrf2 and HO-1 in LPS group were extremely significantly up-regulated compared with CT group (P<0.01).Compared with LPS group,Nrf2 and HO-1 mRNA expression in LH group were extremely significantly down-regulated (P<0.01),Nrf2 protein expression was extremely significantly decreased (P<0.01),and HO-1 protein expression was extremely significantly increased (P<0.01).Compared with LH group,Nrf2 and HO-1 mRNA expression in LHZ group was extremely significantly up-regulated (P<0.01),Nrf2 protein expression was extremely significantly increased (P<0.01),and HO-1 protein expression was extremely significantly decreased (P<0.01).Compared with CT group,the indexes of HO-1 group were not significantly different (P>0.05).【Conclusion】 20 μg/mL LPS induced macrophages to produce inflammatory response and oxidative stress.0.08 μg/mL HO-1 had anti-inflammatory and antioxidant effects.HO-1 regulated Nrf2 signaling pathway to exert anti-inflammatory and antioxidant effects.

Key words: heme oxygenase-1; lipopolysaccharide; RAW264.7 cells; oxidative stress; inflammatory response

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