Lancet Neurol:50-95岁年龄段人群认知老化生物标志物变化

2017-04-27 zhangfan MedSci原创

ATN各组的比例随患者年龄不断变化,随着年龄升高,更多的生物标志物发生异常导致患者认知能力持续下降

近日研究人员公布了一种新的阿尔茨海默病和认知老化生物标志物分类研究分类,该方法分为三类:根据淀粉样沉积物(A)、tau蛋白病变(T)以及神经退行性疾病或神经元损伤(N)是否病变可以有8种不同结果。研究人员对50岁及以上人群进行ATN临床测试。

参与测试人群年龄50-89岁,参与者被随机选择,按年龄和性别分层,并进行认知评估,脑成像研究和多模态成像研究。利用淀粉样沉积PET、tau蛋白病变PET以及MRI评估皮质厚度区分参与者ATN情况。淀粉样沉积PET、tau蛋白病变PET以及MRI评估皮质厚度标准摄取值比值分界点分别为1.42,1.23以及2.67mm。

各个ATN组别人数如下: A-T-N-165, A-T+N-35, A-T-N+63, A-T+N+19, A+T-N-44, A+T+N-25, A+T-N+ 35以及  A+T+N+49;各组平均年龄跨度由A-T+N-的57岁至A+T-N+的80岁。各组的APOE ε4等位基因携带者差异较大(p=0.04),A+组的携带率是A-组的两倍;各组之前白质高信号病变体积以及认识性能差异较大;tau蛋白病变PET以及神经退行性病变生物标志物在大多数诊断为II或III级临床前阿尔茨海默病患者(A+T+N-, A+T-N+, A+T+N+; 86% 的65岁以上患者以及 51%的80岁以上患者)与疑似非阿尔茨海默病的病理生理学特征患者(A-T+N-, A-T-N+, A-T+N+; 92% 的 65岁以上患者以及78%的 80岁以上患者)中的差异较大。50岁之后A-T-N-患者比例下降但A-T+N+比例上升,无论性别A-T-N-在70岁之前的比例最高;80岁之后A+T+N+比例最高;85岁以上患者中,有90%的患者存在至少一种的生物标志物异常。

研究表明ATN各组的比例随患者年龄不断变化,随着年龄升高,更多的生物标志物发生异常导致患者认知能力持续下降。

原文出处

Clifford R Jack Jr et al. Age-specific and sex-specific prevalence of cerebral β-amyloidosis, tauopathy, and neurodegeneration in cognitively unimpaired individuals aged 50-95 years: a cross-sectional study. Lancet Neurol. April 26, 2017

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    2017-06-01 howi
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    2017-12-24 yinhl1978
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