生物标志物 生物标志物
Yishu Chao1, Trevor A Chadwick1, Karly Cody2
1University of California, Berkeley, Berkeley, CA, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 25, 2025
概括
在TAU PET成像中,特别是在PI2620标记器中,脱位信号 (OTS) 可以导致粉样蛋白阴性个体的错误阳性. 这凸显了需要仔细评估OTS在定量TAU PET分析中的需要,以准确地确定疾病的阶段.
科学领域:
- 神经成像是一种神经成像.
- 分子成像学分子成像学
- 阿尔茨海默氏症疾病研究研究
背景情况:
- 定量定子发射断层扫描 (PET) 成像对于确定神经退行性疾病的阶段至关重要.
- 来自tau PET配体的目标外信号 (OTS) 可能会混定量分析.
- 了解OTS对疾病病期的影响对于准确的诊断和治疗监测至关重要.
研究的目的:
- 调查与TAU PET配体相关的脱信号 (OTS) 对定量疾病病期的影响.
- 确定OTS是否以及如何影响不同粉样蛋白状态中的tau阳性率.
主要方法:
- 利用55岁以上的个体的TAU PET (MK6240,PI2620,FTP) 和MRI扫描.
- 协调管道用于扫描处理,tau PET扫描被下小脑正常化.
- 定义并应用了非目标信号 (OTS) 感兴趣的区域 (ROI),并使用全球β-粉样蛋白 (Ab) SUVRs确定了粉样蛋白状态.
主要成果:
- 对于每个标志物,观察到不同的OTS模式:MK6240显示脑膜结合,PI2620显示头骨,脑膜和白质OTS,FTP显示基底和白质的信号升高.
- 对于PI2620,在所有OTSROI中发现了tau和粉样蛋白状态之间的显著相互作用效应,特别是在粉样蛋白阴性 (Ab-) 个体中.
- 这些相互作用表明,OTS可能会导致tau PET成像中的错误阳性,特别是在Ab-组.
结论:
- 在对PI2620标记物的阳性,粉样蛋白阴性 (T+Ab-) 组中检测到升高的OTS.
- 在认知上未受损的粉样蛋白阴性受试者中,OTS可能会导致错误阳性粉样蛋白阳性.
- 建议对扫描进行进一步的视觉检查,以量化与OTS相关的错误阳性率.
相关概念视频
01:20Blood Studies for Cardiovascular System I: Cardiac Biomarkers
749
Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
749
01:19Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers
516
Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
516