生物标志物 生物标志物
Emily N Holy1, Guobao Wang1, Benjamin A Spencer1
1University of California Davis, Davis, CA, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 26, 2025
概括
阿尔茨海默氏病 (AD) 粉样β (Aβ) 可以通过全身PET成像在肝脏中检测到. 在AD患者中肝脏Aβ信号增加表明肝脏是疾病进展的潜在生物标志物.
科学领域:
- 神经科学是一个神经科学.
- 医疗成像医学成像
- 生物化学 生物化学
背景情况:
- 阿尔茨海默病 (AD) 的特征是大脑中的粉样ββ (Aβ) 斑块.
- 在肝脏等外围器官中,Aβ也存在并降解.
- 目前对阿尔茨海默病的PET成像仅限于大脑,忽视了全身Aβ分布.
研究的目的:
- 利用全身PET成像来描述肝脏的Aβ信号随着时间的推移.
- 为了研究患有阿尔茨海默病和没有阿尔茨海默病的个体之间肝脏Aβ沉积的差异.
- 为肝脏Aβ检测建立最佳的成像窗口.
主要方法:
- 在全身uEXPLORER PET系统上进行了F-florbetaben动态PET成像.
- 感兴趣的区域被定义为八个肝脏部分和一个复合肝脏区域.
- 标准化摄入值比率 (SUVR) 时间活动曲线使用线性混合效应模型进行了分析.
主要成果:
- 患有AD的个体 (Aβ+) 与对照组 (Aβ-) 相比,在较晚的时间点 (90-110分钟) 显示肝脏SUVR显著增加.
- 在以后的时间点,Aβ+和Aβ-组之间的歧视最为显著.
- 早期和中期时间点在肝脏SUVR.中显示出有限的歧视.
结论:
- 肝脏表现出一种随时间变化的粉样蛋白信号,类似于大脑.
- 90-110分钟的时间窗口是使用PET评估肝脏粉样蛋白负担的最佳时间窗口.
- 这些发现支持肝脏作为AD和全身分子过程的潜在外围生物标志物.
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