Chinese Journal of Tissue Engineering Research ›› 2022, Vol. 26 ›› Issue (24): 3826-3832.doi: 10.12307/2022.561

Previous Articles     Next Articles

CD1d-mediated inhibition of the nucleotide-binding oligomerization domain-like receptor protein 3 inflammatory factor expression via signal regulatory protein-alpha

Xiang Mingzhi1, 2, Yuan Zilin2, 3, Wang Gang2, 3, Cheng Jie2, 4, Diao Bo2, 3, Liu Yueping2, 3   

  1. 1Medical College, Wuhan University of Science and Technology, Wuhan 430081, Hubei Province, China; 2Basic Medical Laboratory, General Hospital of Central Theater Command, Wuhan 430070, Hubei Province, China; 3Hubei Key Laboratory of Central Nervous System Tumor and Intervention, Wuhan 430070, Hubei Province, China; 4First School of Clinical Medicine, Southern Medical University, Guangzhou 510515, Guangzhou Province, China
  • Received:2021-01-28 Accepted:2021-03-04 Online:2022-08-28 Published:2022-01-24
  • Contact: Diao Bo, MD, Associate professor, Basic Medical Laboratory, General Hospital of Central Theater Command, Wuhan 430070, Hubei Province, China; Hubei Key Laboratory of Central Nervous System Tumor and Intervention, Wuhan 430070, Hubei Province, China Liu Yueping, Master, Associate chief technician, Basic Medical Laboratory, General Hospital of Central Theater Command, Wuhan 430070, Hubei Province, China; Hubei Key Laboratory of Central Nervous System Tumor and Intervention, Wuhan 430070, Hubei Province, China
  • About author:Xiang Mingzhi, Master candidate, Physician, Medical College, Wuhan University of Science and Technology, Wuhan 430081, Hubei Province, China; Basic Medical Laboratory, General Hospital of Central Theater Command, Wuhan 430070, Hubei Province, China
  • Supported by:
    the National Natural Science Foundation of China, No. 81971478, No. 81771691 (to DB)

Abstract: BACKGROUND: Nucleotide-binding oligomerization domain-like receptor protein 3 (NLRP3) inflammatory factors have been proven to be associated with a variety of inflammatory diseases, and regulating their expression will provide some insights into the treatment of related diseases.
OBJECTIVE: To explore whether CD1d regulates the expression of NLRP3 inflammatory factors so as to verify the underlying mechanism that CD1d regulates the NLRP3 inflammasomes expression via signal regulatory protein-α (SIRPα).
METHODS: (1) 293T cells were transfected with Flag-CD1d and HA-SIRPα lentivirus overexpression vectors for co-immunoprecipitation assay to verify the interaction between CD1d and SIRPα. (2) RAW264.7 was transfected with the Flag-CD1d lentiviral overexpression vector. RT-qPCR was used to detect the expression of NLRP3 and other genes. (3) RAW264.7 was transfected with the overexpression vector of HA-SIRPα lentivirus. The gene and protein expression levels of NLRP3  were detected by RT-qPCR and western blot assay, respectively. (4) SIRPα lentivirus RNAi vector was used to transfect RAW264.7. After lipopolysaccharide stimulation, gene and protein expression levels of NLRP3 were detected by RT-qPCR and western blot assay. 
RESULTS AND CONCLUSION: (1) Co-immunoprecipitation assay confirmed the interactions between CD1d and SIRPα. (2) After overexpression of CD1d gene, the expression levels of NLRP3, pro-IL-1β and pro-IL-18 gene in the experimental group were significantly lower than those in the normal group (P < 0.05). (3) The expression of NLRP3 in the experimental group was significantly lower than that in the normal group after lipopolysaccharide stimulation (P < 0.05), but there were no differences in the expression of pro-IL-1β and pro-IL-18 between the experimental group and the control group (P > 0.05). The protein expression of p38, P-P38, NLRP3, pro-IL-1β and pro-IL-18 in the experimental group was significantly lower than that in the SIRPα interference group (P < 0.01). (4) The expression of NLRP3, pro-IL-1β, and pro-IL-18 gene in the experimental group was significantly higher than that in the normal group after lipopolysaccharide stimulation (P < 0.05). The protein expression of p38, p-p38, NLRP3, pro-IL-1β, and pro-IL-18 in the experimental group was significantly higher than that in the overexpression SIRPα group (P < 0.01). (5) It is concluded that CD1d forms a complex with SIRPα on the cell membrane, then inhibits the downstream p38MAPK/NF-κB pathway via SIRPα, and finally inhibits the expression of NLRP3 inflammatory factors. 

Key words: CD1d, signal regulatory protein-α, NLRP3, inflammatory factor, p38MAPK, NF-κB, pathway

CLC Number: