RÉSUMÉ
Objective:To study the associations between single-nucleotide polymorphisms (SNPs) of rs4977574/rs1537378 in ANRIL gene and risk of ischemic stroke. Methods:PubMed, Embase, The Cochrane Library, and CNKI, Wanfang, and VIP Data were searched from inception to September 2020 to collect literatures about randomized controlled trials on associations between SNPs of rs4977574/rs1537378 in ANRIL gene and risk of ischemic stroke. According to inclusion and exclusion criteria, the literatures were selected and the data were extracted; Stata15.1 software was used for Meta analysis of the literatures. Results:About the associations between rs4977574 polymorphism of ANRIL gene and risk of ischemic stroke, a total of 7 articles were chosen, including 12 553 patients in the case group and 15 547 patients in the control group; about the associations between rs1537378 polymorphism of ANRIL gene and risk of ischemic stroke, a total of 6 articles were chosen, including 6166 patients in case group and 6129 patients in control group. The results of Meta analysis indicated that rs4977574 polymorphism had a significant association with ischemic stroke susceptibility under 5 genetic models: allele model [G vs. A]: OR=1.110, 95%CI: 1.020-1.210, P=0.010; dominance model ([GG+GA] v s. AA): OR=1.170, 95%CI: 1.070-1.280, P=0.001; recessive model (GG vs. [GA+AA]): OR=1.160, 95%CI: 1.050-1.280, P=0.020; homozygote model (GG vs. AA): OR=1.260, 95%CI: 1.130-1.420, P=0.000; heterozygote model (GA vs. AA): OR=1.130, 95%CI: 1.030-1.240, P=0.010. The rs1537378 polymorphism was associated with reduced risk of ischemic stroke under 5 genetic models: allele model (T vs. C): OR=0.800, 95%CI: 0.700-0.920, P=0.001; dominance model ([TT+TC] vs. CC): OR=0.790, 95%CI: 0.680-0.920, P=0.002; recessive model (TT vs. [TC+CC]): OR=0.830, 95%CI: 0.740-0.930, P=0.001; homozygote model (TT vs. CC): OR=0.780, 95%CI: 0.690-0.880, P=0.000; heterozygote model (TC vs. CC): OR=0.870, 95%CI: 0.810-0.940, P=0.001. Conclusions:The rs4977574 polymorphism in ANRIL gene is a susceptibility factor for ischemic stroke, and allele G of this locus can significantly increase the risk of ischemic stroke. The rs1537378 polymorphism in ANRIL gene is a protective factor for ischemic stroke, and carrying this allele T can reduce the risk of ischemic stroke.
RÉSUMÉ
Objective@#To investigate the effect and mechanism of LncRNA ANRIL on the radiosensitivity of HCT116 cells line and nude mouse transplant tumors.@*Methods@#The expression of LncRNA ANRIL in colorectal cancer cells was detected by qPCR. The negative control siRNA, ANRIL siRNA, miR-NC mimic, miR-195 mimic, miR-NC inhibitor and miR-195 inhibitor were transfected into HCT116 cells, and marked as negative control group, silencing ANRIL group, overexpressing miR-NC group, overexpressing miR-195 group, inhibiting miR-NC group and inhibiting miR-195 group, and the HCT116 cells without any treatment were marked as the blank control group. The clone formation assay was used to detect radiosensitivity of colorectal cancer cells, flow cytometry was used to detect apoptosis. The web site, StarBase, was used to predict the downstream miRNAs of ANRIL and dual luciferase reporter gene assay was used to further verify. Subcutaneous tumor transplantation assay was used to detect the effect of ANRIL on the growth of colorectal cancer cells after irradiation.@*Results@#After irradiation with 2, 4, 6 and 8 Gy, the cell survival fraction of silencing ANRIL group was significantly decreased when compared with that of negative control group (P<0.05), and the radiosensitivity ratio was 1.52. The apoptosis rate of the silencing ANRIL+ 4 Gy group was significantly higher than that of the negative control+ 4 Gy group ((27.86±2.78)% vs. (12.06±1.46)%, P<0.05). The results of the experiment on nude mouse transplant tumors showed that the tumor volume in the negative control group was lower than that of the silent ANRIL group on days 13, 16, 19, 22 and 25 ((234±66) mm3, (273±63) mm3, (296±72) mm3, (321±85) mm3 and (403±94) mm3 vs. (357±79) mm3, (485±124) mm3, (617±143) mm3, (764±174) mm3 and (985±221) mm3P<0.05). MiR-195 is a target gene of ANRIL, and inhibition of miR-195 can reverse the inhibitory effect of silencing ANRIL on radiosensitivity, apoptosis and xenografts of HCT116 cells.@*Conclusions@#LncRNA ANRIL regulates the radiosensitivity of colorectal cancer cells by miR-195, which may provide a new sensitizing target for clinical colorectal cancer radiotherapy.