To study endoplasmic reticulum(ER) stress and damage during prion replication, 14-3-3 protein dimer depolymerization and Bax/14-3-3 dissociation will be tested, and the phenomenon of both Bax translocation to the ER membrane and increased permeability of the ER membrane will be observed in the appear of abnormal prion protein characteristics of PrP106-126 peptide. To further confirm specific function of Bax translocation on ER membrane in the appear of PrP106-126, ER membrane permeability, ER calcium ion outflow and cytoplasm calcium concentration increase will be tested after inhibiting the expression of Bax or 14-3-3 or function of ER calcium channel and receptor.
本研究针对朊病毒病细胞内存在内质网应激的现象,拟以具有异常朊蛋白特征的PrP106-126多肽为研究对象,检测PrP106-126肽作用多种细胞后14-3-3蛋白二聚体解聚的现象,并引起Bax与14-3-3x解离;观察解离的Bax转位至内质网膜使得内质网膜通透性增加的现象。抑制Bax、14-3-3蛋白的表达或内质网钙通道及受体功能,进一步证实PrP106-126通过引起内质网钙离子外流的关键环节是Bax与14-3-3蛋白解离而致内质网膜转位致膜通透性增加,从而为朊病毒引起的内质网应激及损伤机制的研究打下一定的基础。
一、研究计划要点及执行情况概述。.按计划进行。.研究发现PrP106-126肽诱导细胞出现核固缩及碎裂的凋亡现象,同时,也诱导细胞PARP降解;PrP蛋白促进重组14-3-3β蛋白多聚体形成;PrP106-126肽抑制了14-3-3β蛋白二聚体和多聚体形成;PrP蛋白拮抗PrP106-126肽抑制14-3-3β蛋白多聚体的形成;研究还发现细胞通过IRES途径调控14-3-3蛋白的表达。
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数据更新时间:2023-05-31
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