Neurology:高精度血浆β-淀粉样蛋白42/40预测脑淀粉样变性准确率为94%

2019-08-06 Violet MedSci原创

以淀粉样蛋白PET或者脑脊液(CSF)标本中p-tau181/Aβ42为参照标准,研究高精度检测血浆β-淀粉样蛋白(Aβ)42/Aβ40法能否对脑淀粉样变性进行准确诊断。采用免疫沉淀法和液相色谱-质谱法,对158名认知正常人血浆和脑脊液标本中的Aβ42/Aβ40 进行检测,且进行了淀粉样蛋白PET扫描。血浆Aβ42/Aβ40 与淀粉样PET状态(受试者工作特征曲线下面积[AUC]0.88,95%置

以淀粉样蛋白PET或者脑脊液(CSF)标本中p-tau181/Aβ42为参照标准,研究高精度检测血浆β-淀粉样蛋白(Aβ)42/Aβ40法能否对脑淀粉样变性进行准确诊断

采用免疫沉淀法和液相色谱-质谱法,对158名认知正常人血浆和脑脊液标本中的Aβ42/Aβ40 进行检测,且进行了淀粉样蛋白PET扫描。

血浆Aβ42/Aβ40 与淀粉样PET状态(受试者工作特征曲线下面积[AUC]0.88,95%置信区间[CI]0.82-0.93)和CSF p-tau181/Aβ42(AUC 0.85,95%CI 0.79-0.92)具有很高的相关性。血浆Aβ42/Aβ40、年龄和 APOE ε4的组合与淀粉样PET的相关性很高(AUC 0.94,95%CI 0.90–0.97)。与血浆Aβ42/Aβ40阴性的患者相比,基线时淀粉样蛋白PET阴性和血浆Aβ42/Aβ40阳性的患者转化为淀粉样蛋白PET阳性的风险高出15倍(p=0.01)。

血浆Aβ42/Aβ40,特别是结合年龄和APOE ε4水平,能准确诊断脑淀粉样变性,可用于筛查认知正常个体的脑淀粉样变性。阳性血浆Aβ42/Aβ40和阴性淀粉样蛋白PET扫描的患者转化为阳性淀粉样蛋白PET的风险增加。血浆Aβ42/Aβ40可用于预防试验,以筛选淀粉样蛋白PET可能阳性和有阿尔茨海默病痴呆风险的个体。

原始出处:
Suzanne E. Schindler,et al.High-precision plasma β-amyloid 42/40 predicts current and future brain amyloidosis.Neurology.2019. https://doi.org/10.1212/WNL.0000000000008081

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    2020-01-19 yinhl1978
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随着年龄的增长,体细胞突变在各种组织中积累。近日,韩国科学技术院(KAIST)的研究人员发现,大脑中出现的体细胞突变可能导致阿尔茨海默病的发生。

Science :一夜没睡,患阿尔茨海默症风险或升高

长期以来,睡眠不足一直被认为与阿尔茨海默症(Alzheimer’s disease)有关,但研究人员对睡眠不足如何导致这种疾病却知之甚少。此前已有研究证明,睡眠问题和阿尔茨海默症在一定程度上与该疾病的标志蛋白质β淀粉样蛋白相关。

Brain:新方法有望让阿尔茨海默症患者重拾记忆!

研究人员发现,H3K9me2正是通过改变染色质结构,削弱了谷氨酸受体的转录途径,抑制基因表达,进而减少了谷氨酸受体,最终导致了突触功能缺陷和记忆丧失。换言之,H3K9me2就是谷氨酸受体缺失的真凶,要遏制AD患者的记忆障碍,最重要的就是减少H3K9me2的发生。

Neuron:基因多样小鼠模型打造阿尔茨海默最佳治疗

国家老龄化研究所(NIA)资助的一项研究表明,将遗传多样性纳入阿尔茨海默病的小鼠模型,这将会导致这种普遍的人类疾病的研究可以更全面,可以覆盖到遗传、分子和临床特征的研究,NIA是国家卫生研究所的一部分。

eLife:阿尔茨海默症的基因可能在20多岁时就表现出影响

一项新的研究发现,当有阿尔茨海默症(AD)家族史的年轻人出现记忆衰退时,这可能是严重问题的早期征兆。 为了更好地掌握AD家族史对未来风险的影响,研究者对近60000名18至85岁的男女进行了一项在线单词记忆测试。首先展示12组两个词,之后,只随机显示一个单词,每个受试者被要求回忆起缺失的单词。这个过程重复三次。近5000名有家族史的参与者也提供了血液或唾液样本,测量样本中与AD风险相关的