生物标志物 生物标志物
Paul A Yushkevich1,2, Sadhana Ravikumar3, Laura E M Wisse4
1Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 26, 2025
概括
尸体后MRI和组织学显示,在阿尔茨海默病 (AD) 中的中间叶缩和边缘主导的与年龄相关的TDP-43脑病变 (LATE) 与神经元损失和质变化有关. 这项研究有助于使用MRI生物标志物区分AD和LATE病理.
科学领域:
- 神经科学是一个神经科学.
- 生物标志物 生物标志物
- 神经成像是一种神经成像.
背景情况:
- 在MRI上,中叶 (MTL) 缩是阿尔茨海默病 (AD) 相关的神经退行症的敏感但非特异性生物标志物.
- 临主导的与年龄相关的TDP-43脑病变 (LATE) 是一种常见的共同病理,使用当前的生物标志物难以区分AD.
- 无论是AD还是LATE,都涉及海马和脑内皮层缩,严重程度和空间模式的潜在差异.
研究的目的:
- 为了研究MRI形态测量在AD和LATE中缩的关系.
- 为了将MRI发现与直接的死后神经退行测量相关联,包括神经元数量,大小和密度.
主要方法:
- 使用了9.4T死后MRI和来自24个大脑捐赠者的宁染色组织学 (AD-LATE-, AD+LATE-, AD+LATE+).
- 采用深度学习 (StarDist) 和高斯混合模型来自动检测海马体 (CA1) 和脑内皮层 (ERC) 中的神经元和细胞质.
- 验证了自动化的神经元密度估计与立体测量,并将神经元测量与MTL体积和MRI厚度进行了比较.
主要成果:
- 自动化的神经元密度估计显示与立体学有很好的一致性 (r=0.72).
- 在CA1和ERC中,较高的神经元数量和大小与较少的缩相关,与高级AD和LATE的神经元损失一致.
- 在较大的缩区域增加的CA1神经/质密度和ERC质密度表明更紧密的包装和显著的神经损失有助于MRI缩措施.
结论:
- 最初的可行性结果支持将这条管道应用于更大的数据集,以研究病理和神经元损失.
- 这项研究旨在更好地区分与LATE和AD相关的缩,使用对联的死后MRI和组织学.
- 这些发现鼓励进一步研究改进基于MRI的生物标志物,以区分AD和LATE病理.
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