Lancet Neurol:β-淀粉样变性和神经退行性变性的年龄别人群频率横断面研究

2014-10-27 MedSci MedSci原创

阿尔茨海默病临床前期的治疗性干预措施可以有效地缓解病程的发展,因此在影像学上,尽早鉴别诊断老龄化造成的异常表现和阿尔茨海默病的病变,具有十分重要的临床意义。本研究即在于探究老龄化导致的β-淀粉样变性和神经退行性变性与其在阿尔茨海默病的重合度。 研究方法: 研究人员针对认知功能正常的50-89岁人群,检测了其淀粉样变性和神经退行性变性的年龄别人群频率。研究人员在美国明尼苏达州奥姆斯特镇随机招募志

阿尔茨海默病临床前期的治疗性干预措施可以有效地缓解病程的发展,因此在影像学上,尽早鉴别诊断老龄化造成的异常表现和阿尔茨海默病的病变,具有十分重要的临床意义。本研究即在于探究老龄化导致的β-淀粉样变性和神经退行性变性与其在阿尔茨海默病的重合度。

研究方法:

研究人员针对认知功能正常的50-89岁人群,检测了其淀粉样变性和神经退行性变性的年龄别人群频率。研究人员在美国明尼苏达州奥姆斯特镇随机招募志愿者,并对志愿者进行认知功能和影像学检测。入组的志愿者无认知功能异常,并进行了淀粉样蛋白正电子发射断层扫描(amyloid PET)、18F-脱氧葡萄糖-正电子发射断层扫描(18F-FDG-PET)和核磁共振(MRI)。研究中收集2006年3月28日至2013年12月3日的影像资料。研究人员根据淀粉样蛋白正电子发射断层扫描并结合11C-匹兹堡化合物B(11C Pittsburgh compound B)示踪剂,评估淀粉样变性(A+阳性或A-阴性);以阿尔茨海默病的18F-FDG-PET影像学特点或MRI检查中的海马体积为依据,评估神经退行性变性(N+阳性或N-阴性)。研究人员将病变情况分为4组,即淀粉样变性和神经退行性变性均为阴性(A-N-)、淀粉样变性阳性神经退行性变性阴性(A+N-)、淀粉样变性阴性神经退行性变性阳性(A-N+)、淀粉样变性和神经退行性变性均为阳性(A+N+),并采用多项回归模型,在横断面上评估了4组病变情况的年龄别人群频率。同时,研究人员采用协变量多项式模型,评估了APOEɛ4基因(血样DRN测序)和性别与病变频率的关系。

研究结果:

研究中共招募985名适宜的志愿者。A-N-在50岁人群的频率为100%,但在89岁人群中下降至17%(95% CI 11—24);A+N-的年龄别人群频率在74岁上升至28%(95% CI 24—32),在89岁人群下降至17%(95% CI 11—25)。A-N+年龄别人群频率自60岁开始上升,在89岁人群中达到24%(95% CI 16—34);A+N+年龄别人群频率自65岁开始上升,在89岁人群中达到42%(95% CI 31—52)。多项式模型研究结果表明,A+N-和A+N+在APOE ɛ4基因携带者中的人群频率高于非携带者,A+N+更常见于男性,而A+N-更常见于女性。

研究展望:

随着年龄的增加,不可避免地发生淀粉样蛋白的积聚和神经退行性病变,但是多数人可以维持正常的认知功能,淀粉样变性和神经退行性变性的发生率随年龄有变化,并且可能受APOE ɛ4基因和性别的调控,提示阿尔茨海默病的病生理过程在个体中存在差异。

本文是MedSci原创编译整理,欢迎转载!转载请注明来源并附原文链接。谢谢!

原始出处:

Jack CR Jr, Wiste HJ, Weigand SD, Rocca WA, Knopman DS, Mielke MM, Lowe VJ, Senjem ML, Gunter JL, Preboske GM, Pankratz VS, Vemuri P, Petersen RC. Age-specific population frequencies of cerebral β-amyloidosis and neurodegeneration among people with normal cognitive function aged 50-89 years: a cross-sectional study. Lancet Neurol. 2014 Oct;13(10):997-1005.

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    2015-06-10 howi
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    2014-11-30 yinhl1978
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    2014-10-29 huangdf

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