miR-199a通过靶向ATP13A2抑制6-OHDA诱导的PC12细胞氧化应激

MiR-199a inhibits 6-hydroxydopamine induced oxidative stress in PC12 cells by targeting ATP13A2

目的:探究miR-199a通过靶向调节ATP13A2对6-OHDA诱导的PC12细胞氧化应激的影响。方法:收集正常大鼠和帕金森(PD)模型大鼠脑组织,培养6-OHDA诱导的PC12细胞,利用Real-time PCR检测miR-199a和ATP13A2的表达,Western Blot检测ATP13A2表达。分别转染miR-199a类似物和miR-199a抑制剂,利用ELISA检测ROS、MDA、SOD和GSH-Px的表达。双荧光素酶报告基因检测miR-199a与ATP13A2的靶向关系。Western Blot法检测ATP13A2和JNK/c-Jun表达的影响。MTT法检测细胞增殖的影响。结果:PD脑组织和细胞中miR-199a表达显著降低,ATP13A2表达显著升高(P<0.01)。过表达miR-199a可显著降低6-OHDA诱导的PC12细胞的ROS、MDA活性,升高SOD、GSH-Px活性(P<0.01)。miR-199a过表达显著降低荧光素酶报告基因的荧光强度,而结合位点突变后荧光素酶活性不变(P<0.01)。过表达miR-199a显著降低ATP13A2的表达并抑制JNK和c-Jun的磷酸化水平,茴香霉素则升高ATP13A2表达并激活JNK和c-Jun的磷酸化水平,过表达miR-199a且给予茴香霉素处理可使JNK和c-Jun的磷酸化水平恢复到6-OHDA-PC12组水平(P<0.01)。过表达miR-199a抑制6-OHDA诱导的PC12细胞增殖,茴香霉素则促进其增殖,过表达miR-199a且给予茴香霉素处理可使细胞增殖率恢复到6-OHDA-PC12组水平(P<0.01)。结论:miR-199a可通过靶向调节ATP13A2抑制6-OHDA诱导的PC12细胞氧化应激并抑制JNK/c-Jun活化。

Objective： To investigate the role of miR-199a on the 6-hydroxydopamine （6-OHDA）-induced oxidative stress in PC12 cells by targeting ATP13A2. Methods： Brain tissues of normal rat and Parkinson disease （PD） model rat were collected, and the PC12 ceils treated with 6-OHDA were cultured. The levels of miR-199a and ATP13A2 were detected by Real-time PCR analysis, the protein level of ATP13A2 was detected by Western Blot analysis. PC12 cells were transfected with miR-199a inhibitor and treated with miR-199a inhibitor respectively. The expressions of ROS, MDA, SOD and GSH-Px were measured by ELISA analysis. Then, the target relationship of miR-199a and ATP13A2 was determined by dual-luciferase reporter gene assay. In addition, the effects of miR-199a on the ATP13A2 and JNK/c-Jun expressions were assessed by Western Blot analysis. The role of anisomycin on ceils proliferation was detected by MTr assay. Results： The expression levels of miR-199a were significantly decreased and ATP13A2 was increased in PD brain tissues and cells （P 〈 0.01 ）. And, miR-199a overexpression remarkably decreased the ROS, MDA levels and increased the SOD, GSH-Px levels in the PC12 cells treated with 6-OHDA （P 〈 0.01 ）. The results showed that the relative luciferase activity was significantly decreased in PC12 cells transfected with miR-199a mimics, but the fluorescence activity was not changed after the binding site mutation （P 〈 0.01 ）. Overexpression of miR-199a decreased the ATP13A2 expression and reduced the JNK and c-Jun phosphorylation levels, but anisomycin increased the ATP13A2 expression and activated the JNK and c-Jun phosphorylation levels （P 〈 0.01 ）. The phosphorylation levels of JNK and c-Jun were restored to the expressions in 6-OHDA-PC12 group by co-treatment of miR-199a overexpression and anisomycin. MiR-199a overexpres- sion inhibited the 6-OHDA induced the PC12 cells proliferation, while anisomycin promoted the cells proliferation. More- over, the cells proliferation rate was restored to the rate in the 6-OHDA-PC12 group by co-treatment of miR-199a overex- pression and anisomycin （P 〈 0.01 ）. Conclusion： MiR-199a inhibited 6-OHDA induced oxidative stress in the PC12 cells by targeting ATP13A2 and down-regulated the JNK/c-Jun activation.