EMBO J:压力是如何增加阿尔茨海默症的发病风险的?

2015-09-20 MedSci MedSci原创

EMBO:压力是如何增加阿尔茨海默症的发病风险的?既往研究表明压力可增加阿尔茨海默症的发病风险,但确切的机制却尚未清楚。来自佛罗里达大学的一项研究发现,应激反应中大脑释放一种激素可增加与阿尔茨海默症发生相关的蛋白的水平,该研究成果发表于EMBO。基于此发现,研究人员正试图研发一种新的阿尔茨海默症的防治措施:应用抗体阻断激素的释放以抑制阿尔茨海默症相关蛋白的产生。该研究中,Dr. Golde及其同事

既往研究表明压力可增加阿尔茨海默症的发病风险,但确切的机制却尚未清楚。来自佛罗里达大学的一项研究发现,应激反应中大脑释放一种激素可增加与阿尔茨海默症发生相关的蛋白的水平,该研究成果发表于EMBO J上。

基于此发现,研究人员正试图研发一种新的阿尔茨海默症的防治措施:应用抗体阻断激素的释放以抑制阿尔茨海默症相关蛋白的产生。

该研究中,Dr. Golde及其同事对比了受到急性应激刺激的小鼠与未受到应激刺激的小鼠,发现与无压力小鼠相比,压力小鼠的大脑中可发现大量的β-淀粉样蛋白。而总所周知,阿尔茨海默症患者大脑中β-淀粉样蛋白积聚所形成的斑块可破坏脑细胞之间的通讯。

进一步的研究显示,压力引起大脑释放的激素为促肾上腺皮质激素释放因子(CRF),该激素可提高γ-分泌酶的活性,从而增加了β-淀粉样蛋白的生成。

研究人员发现,将CRF作用于培养皿中的人大脑神经元后,β-淀粉样蛋白的水平可显著升高。
作者表示,“这些发现表明CRF可通过提高γ-分泌酶的活性,从而增加β-淀粉样蛋白的水平。这为探究压力增加阿尔茨海默症发病风险的机制提供了进一步的见解。”

研究人员认为他们的研究结果可为阿尔茨海默症的防治提供一种新的策略;使用抗体靶向CRF以降低应激激素的释放,继而减少β-淀粉样蛋白的产生。不过该策略研究起来仍是十分困难的。
“这些可导致阿尔茨海默症发生的非遗传因素是很难消除的,” Dr. Golde说道,“但是我们正酝酿需要比现在更多的新的方法。”

原始出处:

Park HJ, Ran Y, Jung JI, Holmes O, Price AR, Smithson L, Ceballos-Diaz C, Han C, Wolfe MS, Daaka Y, Ryabinin AE, Kim SH, Hauger RL, Golde TE, Felsenstein KM.The stress response neuropeptide CRF increases amyloid-β production by regulating γ-secretase activity. EMBO J. 2015 Jun 12;34(12):1674-86. 

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    2015-09-21 he408015781

    不错的视角,长见识了

    0

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    2015-09-21 he408015781

    不错的视角,长见识了

    0

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