Caspr與β-淀粉樣前體蛋白在體外相互作用減少了β-淀粉樣蛋白的產生
[Abstract]:Objective: to study the relationship between Caspr (Contactin associated protein) and 尾 -amyloid precursor protein (Amyloid PrecursorProtein,APP), and to explore the mechanism of Caspr inhibiting the production of 尾 -amyloid protein (A 尾). To reveal the role of Caspr in the pathogenesis of Alzheimer's disease. Methods: the distribution of Caspr in the brain of APP/PS1 senile dementia mice was observed by immunofluorescence technique (Immunofluorescence staining). The expression of Caspr protein in the brain of APP/PS1 senile dementia mice and the same litter wild type mice was observed by Western blotting (western blot). HEK-293 cells (V717FnHEK-APP) expressing Indiana mutant APP and CHO cells expressing endogenous APP were used to transfect plasmid PCMV-Caspr-myc and its empty vector into the cells by cell transfection technique. The expression of APP protein was observed by Western blot and mRNA expression of APP was detected by real-time quantitative PCR (Quantitativereal-time PCR,qPCR). The co-localization of Caspr and APP in cells and cerebral cortex of adult C57BL/6J mice (male) was observed by immunofluorescence technique, and the interaction between Caspr and APP was studied by immunoprecipitation (Co-Immunoprecipitation,Co-IP). Plasmid PCMV-Caspr-myc was transfected into HEK-APP cells. The effect of Caspr on A 尾 (A 尾 40 and A 尾 42) of APP was studied by (ELISA), and the effect of Caspr transfection on cell activity was detected by MTT colorimetry. Results: immunofluorescence assay showed that in the cerebral cortex of APP/PS1 dementia mice, Caspr was highly concentrated around senile plaque. Western blot showed that the expression of Caspr was increased in the cerebral cortex of APP/PS1 senile dementia mice compared with the control group. The results of Western blot and qPCR showed that overexpression of Caspr in HEK-APP and CHO cells decreased the expression of APP protein, but did not affect the mRNA level of APP. Immunofluorescence technique showed that both Caspr and APP were located on the membrane of mouse cerebral cortex and cell line, and Co-IP confirmed that they interact with each other. The results of ELISA showed that Caspr could inhibit the production of A 尾 (A 尾 40 and A 尾 42), but the ratio of A 尾 42 / A 尾 40 was not affected, and the cell activity was not affected by MTT colorimetry. Conclusion: in the cortex of APP/PS1 model mice, the expression of Caspr increases and aggregates around the senile plaque. Caspr binds to APP and Caspr reduces the expression of APP protein through the mechanism of posttranscriptional regulation. And inhibit the production of A 尾, which leads to the formation of senile plaque. Therefore, our study found that Caspr is involved in the pathogenesis of Alzheimer's disease and may be a new drug target for the treatment of AD.
【學位授予單位】:蘇州大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:R749.16
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