RÉSUMÉ
Objective To construct the clustered regularly interspaced short palindromic repeats / associated protein 9 (CRISPR/ Cas9) plasmid targeting forkhead box J2 (FOXJ2) gene and investigate the effects of FOXJ2 interference on the expression of transforming growth factor-β(TGF-β) / Smads and proliferation in hepatocellular carcinoma cells of mouse. Methods Small guide RNA(sgRNA) sequence of FOXJ2 was designed, linked with PX458 vector and transfected into competent E. coli for proliferation. The recombinant plasmids were sent for sequencing to confirm the accuracy of the sgRNA sequence. The PX458-FOXJ2-sgRNAs plasmids were transfected into Hepa1-6 cells by liposome transfection, respectively. The empty vectors of PX458 were transfected as control group. After 48 hours, the expression of FOXJ2, TGF-β and Smads were obtained by RT-PCR and agarose gel electrophoresis, respectively. The cell proliferation was detected by methylthio tetrazole (MTT) method . Results The CRISPR/ Cas9 plasmids of PX458-FOXJ2-sgRNAs were successfully constructed. The recombinant plasmid of PX458-FOXJ2-sgRNA2 could effectively inhibit FOXJ2 gene expression which induced increasing expression of TGF-β, Smad2 and Smad4 in Hepa1-6 cells comparing to the control group transfected with PX458 only. And the proliferation of Hepa1-6 was promoted in PX458-FOXJ2-sgRNA2 interference group. Conclusion In hepatocellular carcinoma cells of mouse, FOXJ2 gene inhibits the expression of TGF-β, Smad2, Smad4 and cell proliferation partially, which indicates the relationship between FOXJ2 and TGF-β signal pathway. The result provides the target molecule of FOXJ2 for the prevention and treatment of hepatocellular carcinoma.
RÉSUMÉ
Objective To construct the recombinant plasmids of knocking down Rho guanine dissociation inhibitor α (GDIα ) gene by using clustered regularly interspaced short palindromic repeats/associated protein 9 (CRISPR/Cas9) technique, and investigate the effect of Rho GDIα interference on the migration of Hepa 1-6 cells of mouse in order to provide the method of prevention and treatment of liver cancer. Methods To construct and identify the PX458-Rho GDIα-single guide (sg) RNAs by using CRISPR/Cas9 technique. And the Hepa 1-6 cells were transfected by liposomes with PX458-Rho GDIα-sgRNAs for 48 hours respectively, and cells treated with PX458 plasmids were used as control. The migration ability of Hepa 1-6 was checked by wound healing assay and Transwell assay, respectively. Results The expression of Rho GDIα was depressed in group of PX458-Rho GDIα-sgRNAl transfection which was detected by using RT-PCR. The migration distance of Hepa 1-6 in PX458-Rho GDIα-sgRNAl transfection group was significantly promoted comparing with the control group which was transfected with PX458 only, and the cell number of PX458-Rho GDIα-sgRNAl group was more than that in control group by using transwell assay, indicating concluded that knocking down of Rho GDIα promoted the migration ability of Hepal-6 cells. Conclusion The result is explicit that in vivo, Rho GDIα may inhibit the migration of Hepal-6 partially. Overexpression of Rho GDIα might be used as an important method to prevent the metastasize of carcinoma.