Scientia Agricultura Sinica ›› 2019, Vol. 52 ›› Issue (6): 1102-1109.doi: 10.3864/j.issn.0578-1752.2019.06.013

• ANIMAL SCIENCE·VETERINARY SCIENCE·RESOURCE INSECT • Previous Articles     Next Articles

Construction of Chicken TIGAR Gene Eukaryotic Expression Plasmid and Evaluation of Its Anti-Apoptotic Function

LI YongHua1,2,CHE LuPing2,QIU XuSheng2,TAN Lei2,SUN YingJie2,LIU WeiWei2,SONG CuiPing2,LIAO Ying2,DING Chan2,WANG JinQuan1(),MENG ChunChun2   

  1. 1 College of Animal Medicine, Xinjiang Agricultural University, Urumqi 830052
    2 Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241
  • Received:2018-08-20 Accepted:2018-12-13 Online:2019-03-16 Published:2019-03-22
  • Contact: JinQuan WANG E-mail:wangjinquan163@163.com

Abstract:

【Background】TP53-induced glycolysis and apoptosis regulator (TIGAR) is a target gene downstream of p53, which can regulate glycolysis level, remove reactive oxygen species (ROS) and reduce apoptosis induced by reactive oxygen species (ROS). 【Objective】The objective of this study was to construct the eukaryotic expression plasmid contain of chicken TIGAR gene, and to evaluate its resistance apoptosis effect in DF1 cells, in order to establish the cell line with stable expression of the chicken TIGAR gene. 【Method】According to design primers based on the predicted TIGAR gene published in Genbank (accession number: XM_417232.6), the TIGAR gene from SPF chicken spleen was amplified by RT-PCR, and then amplified products were cloned into expression vector (Flag-CMV14), finally the positive clone was verified by DNA sequencing. Then the phylogenetic tree of chicken TIGAR genes with other mammals and aquatic animals TIGAR gene was constructed to do homology analysis. The recombinant plasmid was transfected into DF1 cells, and infected with Newcastle disease virus to induce apoptosis. The expression of the TIGAR gene and the cleavage level of PARP protein were detected by Western Blot. At the same time the recombinant plasmid (Flag-TIGAR) was transfected into DF1 cells and incubated with apoptosis inducer staurosporine for 2 hours before sample collection, then cells were collected at 24 hours and 48 hours after transfection to evaluate apoptosis level by flow cytometry. 【Result】The TIGAR gene was amplified by RT-PCR, and a band appeared at 843 bp, which was consistent with the prediction. The constructed TIGAR eukaryotic expression plasmid (Flag-TIGAR) was sequenced, and the result showed that the sequence of amplified TIGAR gene were almost consistent with the predicted sequence published on GenBank. Western Blot results showed: cleavaged PARP bands were existed, and the expression level in transfected recombinant plasmid (Flag-TIGAR) group was significantly different (P<0.05) from that in non-transfected plasmid (MOCK) group and transfected empty vector (Flag-CMV14) group. Flow cytometry results showed that the total apoptotic rate was 11% (early apoptosis 7.8%, late apoptosis 3.2%) after transfection with Flag-CMV14 for 24 h, while the total apoptotic rate was decreased to 4% (early apoptosis 3.7%, late apoptosis 0.3%) in Flag-TIGAR transfected group. The early apoptotic rate of Flag-CMV14 transfected group was much higher than that of Flag-TIGAR transfection group, and the difference was very significant (P<0.01), while the late apoptotic rate was also higher than that of Flag-TIGAR transfected group and the difference was significant (P<0.05). The total apoptotic rate was 20.3% (early apoptosis 14.3%, late apoptosis 6.0%) after transfection with Flag-CMV14 for 48 h, while the total apoptotic rate was only 6.4% (early apoptosis 4.8%, late apoptosis 1.6%) after transfection with Flag-TIGAR for 48 h. Both the early apoptotic rate and late apoptotic rate of Flag-CMV14 transfected group were much higher than that of Flag-TIGAR transfected group and the difference was very significant (P<0.01). 【Conclusion】The chicken TIGAR gene was amplified and the eukaryotic expression plasmid was constructed successfully. It was also confirmed that overexpression of chicken TIGAR could obviously reduce the degree of apoptosis and increase cell survival rate.

Key words: TIGAR, Eukaryotic expression plasmid, Newcastle disease virus, Anti-apoptotic function

Fig. 1

Amplification chicken TIGAR gene with RT-PCR 1:The production of amplification chicken TIGAR gene by RT- PCR"

Fig. 2

Phylogenetic tree of TIGAR gene in mammals and aquatic animals"

Fig. 3

Expression of Flag-TIGAR with Western Blot(Flag antibody)"

Fig. 4

Detection PARP expression with Western Blot a:The expression of PARP, NP, TIGAR was detection by Western Blot;b:Relative expression of Cleaved PARP/β-actin"

Fig. 5

Detection the rate of apoptosis with FCM a: Detection the apoptosis of cells by flow cytometry;b: Statistical analysis of apoptosis rate"

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