目的探讨microRNA-144 (miR-144)对非小细胞肺癌(Non-small-cell lung cancer,NSCLC)细胞增殖以及预后的影响。方法通过癌症基因组图谱(The cancer genome atlas,TCGA)检测NSCLC患者组织中miR-144以及泛素样PHD和环指结构域包含1(Ubiqui...目的探讨microRNA-144 (miR-144)对非小细胞肺癌(Non-small-cell lung cancer,NSCLC)细胞增殖以及预后的影响。方法通过癌症基因组图谱(The cancer genome atlas,TCGA)检测NSCLC患者组织中miR-144以及泛素样PHD和环指结构域包含1(Ubiquitin like PHD and ring finger domain 1,UHRF1)的表达预后以及两者表达的相关性。采用CCK-8、AO/EB以及γH2A检测不同表达miR-144对NSCLC细胞活性、细胞凋亡、增殖以及DNA损伤的影响,Western blot检测PCNA、Bax、Bcl-2及UHRF1的表达。荧光素酶报告证明miR-144以及UHRF1的靶向关系。结果在NSCLC患者组织中,miR-144表达水平较低,低表达miR-144 NSCLC患者生存时间明显低于高表达miR-144者。UHRF1在NSCLC患者组织中明显升高,且在不同年龄、性别、TNM分期和种族有显著差异。低表达UHRF1非小细胞肺癌患者生存率明显高于高表达UHRF1的NSCLC患者。过表达miR-144能够明显降低A549细胞活性,诱导A549细胞凋亡,增加γH2ax表达;抑制PCNA以及Bax蛋白表达,上调Bcl-2表达。荧光素酶报告证明UHRF1是miR-144的靶基因。同时,低表达miR-144能够使UHRF1表达增加,过表达miR-144能够抑制UHRF1的表达。结论过表达miR-144通过靶向UHRF1诱导A549细胞凋亡以及DNA损伤,参与NSCLC的病理生理过程,进而影响预后。展开更多
In order to investigate the effect of small ubiquitin-like modifier-1 (SUMO-1) on the p53-induced HepG2 cell apoptosis, HepG2 cells were transfected by recombinant plasmids as pwtp53, pMDM2 and pSUMO-1 respectively. W...In order to investigate the effect of small ubiquitin-like modifier-1 (SUMO-1) on the p53-induced HepG2 cell apoptosis, HepG2 cells were transfected by recombinant plasmids as pwtp53, pMDM2 and pSUMO-1 respectively. Western blot was employed to detect the protein expression of the transfected recombinant plasmids and the rate of apoptosis was measured by flow cytometry. The results showed that in cells transfected with pwtp53 and pwtp53+pSUMO-1, the apoptosis rate was (16.79±1.62) % and (18.15±1.36) % respectively, while transfected with pwtp53+pMDM2, the rate was decreased to (5.17±1.23) %. The apoptosis rate was (14.06±1.84) % in the cells transfected with pwtp53+pMDM2+pSUMO-1, significantly higher than that in the cells Transfected with pwtp53+pMDM2 (P<0.01). The apoptosis rates in the cells were all less than 2 % and had no significant difference among the groups. It was suggested that in the HepG2 cells, SUMO-1 can increase the apoptosis induced by wild-type p53 through binding to p53 protein, post-translational modification and inhibiting the p53 degradation by MDM2.展开更多
文摘目的探讨microRNA-144 (miR-144)对非小细胞肺癌(Non-small-cell lung cancer,NSCLC)细胞增殖以及预后的影响。方法通过癌症基因组图谱(The cancer genome atlas,TCGA)检测NSCLC患者组织中miR-144以及泛素样PHD和环指结构域包含1(Ubiquitin like PHD and ring finger domain 1,UHRF1)的表达预后以及两者表达的相关性。采用CCK-8、AO/EB以及γH2A检测不同表达miR-144对NSCLC细胞活性、细胞凋亡、增殖以及DNA损伤的影响,Western blot检测PCNA、Bax、Bcl-2及UHRF1的表达。荧光素酶报告证明miR-144以及UHRF1的靶向关系。结果在NSCLC患者组织中,miR-144表达水平较低,低表达miR-144 NSCLC患者生存时间明显低于高表达miR-144者。UHRF1在NSCLC患者组织中明显升高,且在不同年龄、性别、TNM分期和种族有显著差异。低表达UHRF1非小细胞肺癌患者生存率明显高于高表达UHRF1的NSCLC患者。过表达miR-144能够明显降低A549细胞活性,诱导A549细胞凋亡,增加γH2ax表达;抑制PCNA以及Bax蛋白表达,上调Bcl-2表达。荧光素酶报告证明UHRF1是miR-144的靶基因。同时,低表达miR-144能够使UHRF1表达增加,过表达miR-144能够抑制UHRF1的表达。结论过表达miR-144通过靶向UHRF1诱导A549细胞凋亡以及DNA损伤,参与NSCLC的病理生理过程,进而影响预后。
文摘In order to investigate the effect of small ubiquitin-like modifier-1 (SUMO-1) on the p53-induced HepG2 cell apoptosis, HepG2 cells were transfected by recombinant plasmids as pwtp53, pMDM2 and pSUMO-1 respectively. Western blot was employed to detect the protein expression of the transfected recombinant plasmids and the rate of apoptosis was measured by flow cytometry. The results showed that in cells transfected with pwtp53 and pwtp53+pSUMO-1, the apoptosis rate was (16.79±1.62) % and (18.15±1.36) % respectively, while transfected with pwtp53+pMDM2, the rate was decreased to (5.17±1.23) %. The apoptosis rate was (14.06±1.84) % in the cells transfected with pwtp53+pMDM2+pSUMO-1, significantly higher than that in the cells Transfected with pwtp53+pMDM2 (P<0.01). The apoptosis rates in the cells were all less than 2 % and had no significant difference among the groups. It was suggested that in the HepG2 cells, SUMO-1 can increase the apoptosis induced by wild-type p53 through binding to p53 protein, post-translational modification and inhibiting the p53 degradation by MDM2.
