一个路线图的人类海马神经发生在成年,衰老和AD
Orly Lazarov1, Ahmed Disouky1, Mark Sanborn2
1The University of Illinois at Chicago.
Research square
|June 10, 2024
概括
这项研究揭示了人类海马神经生成如何随着衰老和阿尔茨海默病 (AD) 的变化而发生变化,突出了神经干细胞和抑制神经元的变化,以及AD中的通信中断.
科学领域:
- 神经科学是一个神经科学.
- 基因组学就是基因组学.
- 衰老研究研究 衰老研究
背景情况:
- 成年海马神经发生对于动物的学习和记忆至关重要,由抑制神经元调节,并与阿尔茨海默病 (AD) 模型有关.
- 人类海马神经发生的机制,与衰老相关的转录基因组/表观基因组变化,以及在阿尔茨海默病中的细胞相互作用仍然不太清楚.
研究的目的:
- 用单核多组学绘制人类海马神经发生的分子机制,跨越衰老,认知衰退和AD神经病理学.
- 调查转录基因和表观基因概况以及细胞利基互动中的动态变化.
主要方法:
- 死亡后人类海马体的单核多组特征分析.
- 神经干细胞 (NSC),神经母细胞和不成熟神经元的转录和表观遗传分析.
- 对抑制性神经元群体的分析 (帕瓦尔胺+,GABAergic).
- 使用CellChat和NeuronChat推断细胞与细胞之间的通信.
主要成果:
- 早期的神经发生变化发生在老化期间的NSC中;认知障碍与神经细胞样本变化有关.
- 阿尔茨海默病在不成熟的神经元中表现出广泛的转录停止,降低了核糖体和线粒体基因的调节.
- 随着衰老和AD观察到的帕尔瓦胺+和其他抑制神经元的显著损失;神经发生标志物与神经病理学相反相关.
- 细胞与细胞之间的通信分析显示,AD神经位中的突触粘附分子和神经递质损失.
结论:
- 人类海马神经发生经历了显著的分子和细胞变化与衰老和AD.
- 抑制性神经元的失调和受损的细胞间通信有助于AD的发病.
- 这项研究提供了对阿尔茨海默病中海马体过度兴奋机制的见解.
相关概念视频
01:26Alzheimer's Disease: Overview
462
Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
462
01:19Role of Hippocampus in Memory
222
The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
222
01:15Neurogenesis and Regeneration of Nervous Tissue
761
In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
761
01:26Aging
48
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
48