Objective To silence the expression of α-synuclein in MN9D dopaminergic cells using vector mediated RNA interference (RNAi) and examined its effects on cell proliferation and viability. Methods We identified two 19...
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Objective To silence the expression of α-synuclein in MN9D dopaminergic cells using vector mediated RNA interference (RNAi) and examined its effects on cell proliferation and viability. Methods We identified two 19-nucleotide stretches within the coding region of the α-synuclein gene and designed three sets of oligonucleotides to generate doublestranded (ds) oligos. The ds oligos were inserted into the pENTR^TM/Hl/TO vector and transfected into MN9D dopaminergic cells, α-Synuclein expression was detected by RT-PCR, real-time PCR, immunocytochemistry staining and Western blot. In addition, we measured cell proliferation using growth curves and cell viability by 3-(4, 5)-dimethylthiahiazo (-z-y 1)-3, 5-diphenytetrazoliumromide (M'FF). Results The mRNA and protein levels of α-synuclein gene were significantly down-regulated in pSH2/α-SYN-transfected cells compared with control MN9D and pSH/CON-transfected MN9D cells, while pSHI/α-SYN- transfected cells showed no significant difference. Silencing α-synuclein expression does not affect cell proliferation but may decrease cell viability. Conclusion Our results demonstrated pSH2/α-SYN is an effective small interfering RNA (siRNA) sequence and potent silencing of mouse α-synuclein expression in MN9D cells by vector-based RNAi, which provides the tools for studying the normal function of α-synuclein and examining its role in Parkinson's disease (PD) pathogenesis. α-Synuclein may be important for the viability of MN9D cells, and loss of α-synuclein may induce cell injury directly or indirectl
目的探讨α-突触核蛋白(α-synuclein)各结构域与MN9D细胞线粒体的关系。方法用PCR方法获得α-synuclein/1~65(N),α-synuclein/61~95(A)及α-synuclein/96~140(C)基因片段,克隆入真核表达质粒pLNCX2,经测序正确后以脂质体转染PT-67细胞,挑取单克隆并扩增,收集上清感染MN9D细胞,分别用Real Time PCR检测细胞基因表达水平,免疫组织化学染色检测蛋白表达,激光扫描共焦显微镜检测蛋白与线粒体共定位,流式细胞术检测细胞状态及线粒体膜电位状态。结果成功构建了pLNCX2/N、pLNCX2/NAC及pLNCX2/C基因片段的重组真核表达质粒,获得了可稳定表达α-synuclein各基因片段的MN9D细胞株。通过激光扫描共焦显微镜观察,可见α-synuclein/N端与线粒体存在共定位关系;α-synuclein/NAC主要在核内聚集表达;α-synuclein/C端在胞质和胞核内均有表达。JC1染色流式细胞术检测显示,过表达α-synuclein/N实验组细胞线粒体膜电位降低。结论α-synuclein的N端可能定位于线粒体,并参与调节线粒体功能;α-synuclein/NAC虽具有疏水性但却能穿过核膜,聚集在核仁周围;α-synuclein的C端定位于胞质和核内可能参与多种细胞功能。
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