Carcinogenesis, Teratogenesis & Mutagenesis ›› 2023, Vol. 35 ›› Issue (4): 245-252.doi: 10.3969/j.issn.1004-616x.2023.04.001

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Protection against LPS-induced pro-inflammatory response by nuezhenide in macrophages

JIANG Xiaoxu1, SUN Muhan2, ZHANG Boxu3, WANG Yuyue3, MA Jiajun3, SHI Minjie2, YU Weihua2, GUO Xian4   

  1. 1. Department of Basic Computer Science, School of Basic Medicine, Air Force Medical University, Xi'an 710032;
    2. Department of Military Toxicology, School of Preventive Medicine, Air Force Medical University, Xi'an 710032;
    3. Cadet Brigade, Air Force Medical University, Xi'an 710032;
    4. Key Laboratory of Aerospace Medicine, Ministry of Education, Department of Aerospace Medicine, Air Force Medical University, Xi'an 710032, Shaanxi, China
  • Received:2023-04-17 Revised:2023-06-14 Online:2023-07-30 Published:2023-08-04

Abstract: OBJECTIVE: This study aimed to investigate effects of nuezhenide (NED) on LPS-induced proinflammatory response in macrophages. METHODS: RAW264.7 cells were treated with 50 μmol/L NED for 12 hours. Differential gene expressions were detected via transcriptome,cell viability using the CCK8 kit,and apoptosis rates measured using Annexin V-FITC/PI staining,and expression and localization of Nrf2 protein were detected by immunofluorescence. The cells were treated with LPS (100 ng/mL) and NED (12.5,25 and 50 μmol/L) for 12 hours. Then,TNF-α and IL-6 contents in the supernatant of cultured cells were determined by ELISA,and expressions of TNF-α and IL-6 by RT-PCR. Moreover,ROS,mitochondrial mass,and membrane potential were measured by flow cytometry after staining with DCFH-DA,MitoTracker-Green and JC-1,respectively. Enzyme activities of SOD and CAT,activities of mitochondrial complexes I and Ⅲ,as well as ATP contents were determined using commercial kits. RESULTS: Our results show that 50 μmol/L NED had no significant effects on survival and apoptosis of the RAW264.7 macrophages (P>0.05). However,NED treatments blunted LPS-induced expression of TNF-α and IL-6 (P<0.05),and enhanced expression of anti-inflammatory cytokines (P<0.05). Meanwhile,NED significantly promoteed Nrf2 nuclear translocation and downstream antioxidant transcription (P<0.05),which contributed to inhibition of LPS-induced accumulation of ROS and GSSG (P<0.05). In addition,NED reversed the LPS-induced decreased of mitochondrial membrane potential,mitochondrial complexes I and III activities,as well as ATP contents through promoting mitochondrial biogenesis (P<0.05). CONCLUSION: NED inhibited LPS-induced macrophages pro-inflammatory differentiation through enhancing Nrf2 antioxidant system and mitochondrial biogenesis. Application of NED may be a potential strategy for treatment of inflammatory diseases.

Key words: nuezhenide, macrophages, inflammatory response, antioxidant, mitochondrial biogenesis

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