J ALZHEIMERS DIS :带有阿尔兹海默症等位基因的中年女性体重下降更快?

2015-10-11 sunshine 译 MedSci原创

J ALZHEIMERS DIS:存在APOE ε4等位基因的女性晚年时期体重减轻的速度更快中老年时期超重及肥胖可增加老年痴呆症的发病风险,然而,在多年的临床痴呆诊断过程中发现,体重或身体质量指数(BMI)的下降以及体重过轻与老年痴呆症的发生同样有关。APOE基因型是阿尔茨海默症(AD)的一个主要易感基因,目前对APOE基因型的修饰作用对BMI—老年痴呆症成人发病过程的影响却知之甚少。研究人员分析

中老年时期超重及肥胖可增加老年痴呆症的发病风险,然而,在多年的临床痴呆诊断过程中发现,体重或身体质量指数(BMI)的下降以及体重过轻与老年痴呆症的发生同样有关。APOE基因型是阿尔茨海默症(AD)的一个主要易感基因,目前对APOE基因型的修饰作用对BMI—老年痴呆症成人发病过程的影响却知之甚少。

研究人员分析了1462名38-60岁的瑞典女性,随访30余年。追踪观察与老年痴呆症始发有关的BMI,并分析了APOE ε4等位基因可能发挥的作用。至2000年时,对尚在人世的559名女性(年龄在70-92岁)采集血液样本以进行遗传分析,并记录其BMI。

结果发现,在后来的37年中,研究对象的BMI变化轨迹与APOEε4等位基因的状态不同。从中年时期至70岁时BMI增加类似的女性中,与不存在APOEε4等位基因的女性相比,存在至少一个APOE ε4等位基因的女性,在其70岁以后BMI下降的速度更快。然而,根据老年痴呆症的发生,对研究对象进行分层,结果发现,老年痴呆症促成了整体的BMI轨迹。其主要原因为年龄,APOE ε4等位基因状态与年龄之间的相互作用以及年龄与存在/不存在老年痴呆症之间的相互作用。

中年时期平均BMI类似的女性表现出不同的BMI轨迹与老年痴呆症的发生。此外,基于APOE ɛ4等位基因存在的基础,老年时期BMI的下降模式各异。因此,这些数据表明,机体成年时期BMI对老年痴呆症以及APOEε4等位基因状态改变的作用。

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根据德国《明镜周刊》报道(2015年第31期,作者Jörg Blech),人类战胜阿兹海默病(老年痴呆症)的最新一次尝试再次以失败告终。一种指望能清洗老年人大脑中的Beta-Amyloid蛋白质的新药“苏蓝粗抹布”(Solanezumab)首次针对病人进行的临床试验结果表明,这种药物没有疗效。 尽管如此,研制苏蓝粗抹布的制药商Eli Lilly没有马上放弃。他们的研究人员甚至进行了二组第三阶

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