带有阿尔茨海默病β-分泌酶活性的膜固的阿斯巴蒂尔蛋白酶
R Yan1, M J Bienkowski, M E Shuck
1Cell & Molecular Biology, Pharmacia & Upjohn, Inc., Kalamazoo, MI 49007, USA. riqiang.yan@am.pnu.com
Nature
|December 11, 1999
概括
研究人员发现了一种新的蛋白酶,Asp2,具有β-分泌酶活性. 这一发现为减少粉样β的产生和预防阿尔茨海默病中粉样斑块的形成提供了潜在的药物标.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 自体主导性阿尔茨海默病与粉样蛋白前体蛋白 (APP) 基因的突变有关.
- 粉样蛋白β-是阿尔茨海默氏症斑块的关键组成部分,由β和分泌酶的APP裂变产生的.
- 在APP中引起疾病的突变有助于其被这些分泌酶分裂.
研究的目的:
- 为了确定负责APP裂变的未识别的β-分泌酶.
- 为了研究这种蛋白酶在粉样β-的生产中的作用.
- 评估这种蛋白酶作为阿尔茨海默病治疗点的潜力.
主要方法:
- 鉴定和描述一种具有β-分泌酶活性的新型膜结合的阿斯巴提尔蛋白酶 (Asp2).
- 对包括大脑在内的各种组织中Asp2基因表达的分析.
- 对细胞中Asp2表达水平的实验操纵,以评估其对粉样β-产生的影响.
- 使用溶解的Asp2蛋白和合成APP基质进行体外酶分析.
主要成果:
- 一种新的阿斯巴提尔蛋白酶,Asp2,被确定并证实具有β-分泌酶活性.
- Asp2在大脑和其他组织中得到广泛的表达.
- 细胞中Asp2表达的减少导致了粉样β-的产生减少和β-分泌酶分裂的APP片段的积累.
- Asp2有效地分裂了一种APP基质,由于早期发病的阿尔茨海默病相关突变,分裂率显著增加.
结论:
- Asp2被确定为参与粉样β-生成的关键β-分泌酶.
- Asp2代表了一个有前途的新治疗点,用于开发抑制粉样β-的药物.
- 阻止Asp2活动可以防止粉样蛋白斑块的形成,为阿尔茨海默病的治疗提供了一种新的策略.
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