Dickkopf-1蛋白与经典Wnt信号通路失活在帕金森病模型中的作用研究
[Abstract]:AIM: Wnt signaling pathway plays an important role in the development of dopaminergic neurons and the damage of dopaminergic neurons in Parkinson's disease.
METHODS: PC12 cells were treated with different concentrations of MPP +. MTT assay was used to detect the survival rate of PC12 cells at different time points and Western Blot to detect the expression of Dkk, beta-catenin and p-Ser9-GSK-3 beta at different time points. Changes in the expression of Dkk1. -cateninn and p-Ser9-GSK-3p were observed.
RESULTS: The survival rate of PC12 cells treated with different concentrations of MPP + for 24 hours had no significant change. The survival rate of PC12 cells treated with high concentrations of MPP + for 48 hours and 72 hours had significant change. After 72 hours of treatment with 1000 mu MMPP + for 72 hours, the cell survival rate decreased to the lowest level of 45.0%, while the effect of 1000 mu mu MMPP + for 48 hours and 72 hours had no effect on the cell survival rate. The results of Western Blot showed that the expression of Dkk1 was significantly increased at 6-24 h, and the peak time of Dkk1 expression was earlier than the time of cell death, but the level of Dkk1 returned to normal at 48 h. After 8 h of MPP + treatment, the level of beta-catenin began to decrease, but decreased significantly at 24 h to 48 h, and p-Ser9-GSK-3 beta (GSK-3 beta) was decreased. LiCl pretreatment significantly increased the expression of beta-catenin and p-Ser9-GSK-3 beta in PC12 cells. LiCl pretreatment reduced the decrease of MPP+induced survival rate of PC12 cells. Annexin V-FITC/PI flow cytometry and TUNEL assay showed that the increase of apoptosis rate of PC12 cells induced by MPP+ could also be induced by LiCl (1mM). Reduce.
CONCLUSION: The classical Wnt signaling pathway protein and its inhibitor Dkk1 may be involved in the decrease of PC12 cells induced by MPP +, and Dkk1 may play a role by inhibiting the classical Wnt signaling pathway protein.
OBJECTIVE: The first part of the experiment showed that Dkk1 induced expression preceded cell death in MPP + induced PC12 cell injury model. The aim of this experiment was to explore the mechanism of Dkk1 induced PC12 cell injury in MPP + induced PC12 cell injury model.
Methods: After 48 hours of exogenous administration of rhDkkl combined with MPP + for PC12 cells, the cell survival rate and the expression of Wnt signaling pathway related proteins were detected.
RESULTS: The results showed that rhDkkl aggravated the damage of MPP + on PC12 cells, but LiCl pretreatment for 1 h could not significantly improve the damage of PC12 cells induced by the combination of hDkk1 (100ng/ml) and MPP +. hDkk1 could promote the decrease of TH in PC12 cells induced by MPP +, and MPP + alone treated PC12 cells. Dkk1-siRNA can significantly reduce the apoptosis of PC12 cells induced by MPP +. 4. Dkk1-siRNA can effectively increase the expression of beta-catenin and p-Ser9-GSK-3 beta, but also significantly increase the level of TH.
CONCLUSION: Dkkl participates in the apoptosis of PC12 cells induced by MPP +, which may be related to the inhibition of classical Wnt signaling pathway.
Objective: To observe the effect of Dkkl on Parkinson's disease model in 6-OHDA injured rats.
METHODS: Parkinson's disease model was established in rats injured with 6-OHDA by brain stereotactic localizer and 6-OHDA by LiCl pretreatment for 7 days. In rats injured with 6-OHDA by rhDkk1 and MFB in substantia nigra, the damage of dopaminergic neurons in substantia nigra was detected by perfusion immunohistochemistry 35 days after operation. The changes of TH, Dkk1, beta catenin and p-Ser9-GSK-3 beta in ventral midbrain of rats were detected by Western Blot.
Results: The number of TH-positive neurons decreased significantly in 6-OHDA injury group, while the number of TH-positive neurons increased significantly in LiC1 preconditioning group. The number of TH-positive neurons decreased more significantly in rhDkk1 and 6-OHDA combined injury group than that in 6-OHDA alone injury group. (3) Inhibition of the classical Wnt signaling pathway was also detected in the ventral midbrain of rats with 6-OHDA injury, including the decrease of beta-catenin and p-Ser9-GSK-3 beta, both of which could be elevated by LiCl; rhDkkl combined with 6-OHDA could further aggravate the decrease of beta-catenin and p-Ser9-GSK-3 beta.
CONCLUSION: Dkkl is induced to express in the ventral mesencephalon of 6-OHDA-injured rats, which may promote the damage of dopaminergic neurons in substantia nigra of 6-OHDA-injured rats by inhibiting the classical Wnt signaling pathway.
【学位授予单位】:华中科技大学
【学位级别】:博士
【学位授予年份】:2012
【分类号】:R742.5
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