Let-7d microRNA Attenuates 6-OHDA-Induced Injury by Targeting Caspase-3 in MN9D Cells

Let-7d microRNA Attenuates 6-OHDA-Induced Injury by Targeting Caspase-3 in MN9D Cells
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Let-7d microRNA 通过靶向 MN9D 细胞中的 Caspase-3 减轻 6-OHDA 诱导的损伤

DOI:
10.1007/s12031-017-0994-x
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发表时间:
2017-10
影响因子:
3.1
通讯作者:
孙申
孙申
中科院分区:
医学4区
文献类型:
--
作者:
李俐;刘辉;宋海晶;秦迎松;王影;徐明;刘超侠;高锦;孙申

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帕金森病(PD)的主要原因是黑质致密部(SNPC)多巴胺(DA)能神经元的进行性丢失,其确切的机制尚不清楚。我们先前工作的结果表明,在6-OHDA诱导的帕金森病细胞模型中,let-7d的表达显著下调。然而,let-7d对.DA神经细胞的确切作用尚不清楚。在MN9D多巴胺能神经元细胞中,我们用let-7d模拟和抑制剂分别上调和下调let-7d的表达,用细胞计数试剂盒检测细胞活力,用TUNEL染色和流式细胞仪检测细胞死亡率,发现let-7d对6-OHDA诱导的细胞损伤有负性调节作用。进一步用caspase-3 siRNA和caspase-3过表达载体(不含3‘非编码区)分别抑制和上调caspase-3的表达,发现caspase-3 siRNA可以逆转LET-7d抑制剂诱导的细胞损伤,caspase-3过表达可以逆转Let-7d模拟的6-OHDA诱导的细胞损伤的保护作用。综上所述,这些发现有力地表明let-7d在DA.神经细胞损伤中起重要作用,并且let-7d的作用至少部分是通过抑制caspase-3的表达来实现的。
Parkinson’s disease (PD) mainly results from the.progressive loss of dopaminergic (DA) neurons in the.substantia nigra pars compacta (SNpc), and the exact underlying.mechanisms of the loss of DA neurons in PD remains.largely unclear. The results of our previous work showed that.let-7d was significantly downregulated in a 6-OHDA-induced.cellular model of PD. However, the exact effect of let-7d on.DA neural cells was unclear. In MN9D dopaminergic neuronal.cells, we used a let-7d mimic and inhibitor to upregulate.and downregulate the expression of let-7d, respectively, a cell.counting kit to assess cell viability, and a TUNEL staining.assay and flow cytometry to examine the cell death rate, and.we found that let-7d could negatively regulate 6-OHDAinduced.cell injury. Then, we verified that caspase-3 was a.target gene of let-7d by using a dual-luciferase reporter system..Furthermore, using caspase-3 siRNA and a caspase-3-.overexpression vector (without the 3′UTR) to respectively.inhibit and increase the expression of caspase-3, we found that.caspase-3 siRNA could reverse the cell injury induced by the.let-7d inhibitor and that caspase-3 overexpression could.reverse the protective effects of the let-7d mimic on 6-.OHDA-induced cell injury. Taken together, these findings.strongly suggest that let-7d plays an important role in DA.neuronal cell injury and that the effects of let-7d are, at least.in part, via the suppression of caspase-3 expression.
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