Beclin1在长春新碱致斑马鱼多巴胺能神经元损伤中的作用

Effect of beclin1 on vincristine-induced dopaminergic neurons injury in zebrafish

以斑马鱼幼鱼为实验动物,通过RT-PCR、Western blotting、过表达、knock down和整体免疫荧光等技术手段,研究长春新碱导致的斑马鱼幼鱼多巴胺能神经元损伤的分子机制,并探索降低长春新碱毒性的分子靶标。结果显示,长春新碱抑制多巴胺能神经元标志基因酪氨酸羟化酶基因、多巴胺转运蛋白基因转录水平,诱导幼鱼脑部多巴胺能神经元细胞丢失。长春新碱浓度依赖性抑制自噬相关基因beclin1的表达,过表达beclin1基因对长春新碱诱导的多巴胺能神经元毒性具有挽救作用,下调beclin1基因加剧长春新碱导致的多巴胺能神经元细胞毒性。结果提示,beclin1基因可能在长春新碱导致的神经毒性中发挥重要作用。

To investigate vincristine-induced dopaminergic neurons toxicity and mechanism, and explore the molecular target to reduce the toxicity, zebrafish was chosen as a model animal, based on RT-PCR, Western blotting, whole mount in situ immunofluorescence and other technical means. The results showed that the transcription levels of tyrosine hydroxylase gene and dopamine transporter protein gene were inhibited. Furthermore, the number of dopaminergic neurons was decreased by vincristine. Autophagy was suppressed and beclinl gene expression was inhibited in a dose-dependent manner by vincristine in larval zebrafish. Up-regulated beclinl partly reduced vincristine-induced neurotoxicity, and down-regulated beclinl increased toxicity. Beclinl plays an important role in vincristine-induced dopaminergic neurons toxicity.