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Alzheimer's & Dementia: 老年唐氏综合征(NiAD)中基线淀粉样蛋白β和神经纤维tau沉积的关系

2020-11-02 haibei MedSci原创

其进行了一项研究,目的是利用[18F]AV-1451正电子发射断层扫描(PET)评估DS患者脑中tau的存在,并利用匹兹堡化合物B(PiB)-PET评估脑tau病理与Aβ的关系。

阿尔茨海默病(AD)的确诊依赖于尸检时淀粉样β(Aβ)斑块和含tau的神经纤维缠结的出现。最近,Aβ和tau的正电子发射断层扫描(PET)配体,如[11C]PiB3,和[18F]AV-14514的出现,允许我们在体内检查认知与AD病理生理学的关系。这些研究表明,tau病理与认知能力下降的关系比Aβ2更密切,并与AD诊断、淀粉样蛋白阳性、和认知功能相关。

唐氏综合征(Down syndrome,DS)的成年人一致受到AD相关病理的影响,其特点是在他们的第四个十年中会出现Aβ斑块,而且他们表现出AD的患病率增加。

从大量的数据来看,淀粉样蛋白前体蛋白(APP)的过度生产,部分是由于21号染色体编码APP的三倍体,显然与DS中AD的高风险和在较早的年龄出现临床AD表型有关。

最近,研究人员在Alzheimer's & Dementia发文,其进行了一项研究,目的是利用[18F]AV-1451正电子发射断层扫描(PET)评估DS患者脑中tau的存在,并利用匹兹堡化合物B(PiB)-PET评估脑tau病理与Aβ的关系。

该研究为多中心队列研究。参与者包括从社区招募的DS患者,和其兄弟姐妹对照组的样本。排除标准包括磁共振成像(MRI)禁忌症和/或损害认知功能的医疗或精神状况。

研究人员使用多重线性回归模型(根据年代年龄、性别和表现部位进行调整),评估研究区域[18F]AV-1451标准摄取值比(SUVR)(基于与Braak阶段1-6相关的区域)和全脑[11C]PiB SUVR(作为连续和二分变量)之间的关联。

该队列研究共对156名参与者(平均年龄=39.05岁,SD(8.4))进行了研究。研究结果揭示了DS患者中体内Aβ和tau病理之间的显著关系。

作为一个二分变量,[18F]AV-1451保留在PiB(+)参与者的每个Braak区域中较高。研究人员还发现,根据其统计模型,从Braak 3感兴趣的区域(ROI)开始,[18F]AV-1451 SUVR沉积加速,[11C]PiB SUVR增加。

 

原始出处:

DL Tudorascu et al. Relationship of amyloid beta and neurofibrillary tau deposition in Neurodegeneration in Aging Down Syndrome (NiAD) study at baseline. Alzheimer's & Dementia (2020). DOI: https://doi.org/10.1002/trc2.12096

 

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    2020-11-04 hb2008ye
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    2020-11-02 lovetcm

    #唐氏综合征#是不是相当于少年时期的#老年性痴呆#

    0

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