在阿尔茨海默氏症模型中,早期的皮质三角管电路过度活动会损害胆能功能和认知灵活性
bioRxiv : the preprint server for biology
|February 6, 2026
概括
早期阿尔茨海默氏症 (AD) 涉及由于过度活跃的中间前额叶皮层 (mPFC) 到背中条体 (DMS) 电路的认知不灵活性. 在5xFAD小鼠中抑制这个电路改善了学习并减少了AD病理.
科学领域:
- 神经科学是一个神经科学.
- 神经退行性疾病 神经退行性疾病
- 计算精神病学是一种计算精神病学.
背景情况:
- 认知灵活性缺陷是阿尔茨海默病 (AD) 的早期指标.
- 在阿尔茨海默氏症早期这种认知不灵活性背后的特定神经电路机制仍然不清楚.
- 5xFAD小鼠模型表现出与AD相关的神经病理学.
研究的目的:
- 研究早期阿尔茨海默病 (AD) 认知不灵活性的电路机制.
- 检查介质前额叶皮层 (mPFC) 和背介质条纹体 (DMS) 电路在AD相关的认知缺陷中的作用.
- 评估针对mPFC-DMS电路的治疗潜力.
主要方法:
- 使用了AD神经病理学的5xFAD小鼠模型.
- 使用仪器逆向学习任务评估认知灵活性.
- 采用电生理学来记录神经元活动和化学遗传学来操纵电路.
- 测量了粉样β (Aβ) 积累和神经递质水平.
主要成果:
- 5xFAD小鼠表现出早期的认知不灵活性,先前存在空间记忆缺陷.
- 在mPFC神经元和mPFC-to-dorsal striatum (DMS) 电路中观察到过度活动,特别是在直接通路中等状神经元 (dMSNs) 中.
- 这种过度活跃导致胆固醇内部神经元 (CIN) 的抑制增加,减少了CIN发射,并减少了条状乙胆 (ACh) 的释放.
- 在5xFAD小鼠中,对mPFC-DMS电路的化学遗传抑制减少了Aβ沉积,正常化了谷氨酸转移,恢复了ACh水平,并挽救了逆转学习缺陷.
结论:
- 一个过度活跃的mPFC-to-DMS电路通过破坏皮质层和胆固醇信号传递,导致早期AD的认知不灵活性.
- 针对这个特定的电路提供了一个潜在的治疗策略,以保持在早期阶段的AD认知功能.
- 这些发现强调了在神经退行性疾病中调查电路水平功能障碍的重要性.
更多相关视频
05:12A Mouse Model for Vascular Cognitive Impairment and Dementia Based on Needle-guided Asymmetric Bilateral Common Carotid Artery Stenosis
Published on: November 22, 2024
1.7K
08:41Author Spotlight: Deciphering the Role of ATM in Ataxia-Telangiectasia and the Associated Cerebellar Degeneration
Published on: December 27, 2024
1.5K
相关概念视频
01:37Neural Regulation
34.8K
Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
34.8K
01:28Disorders of the Nervous Tissue
3.0K
Nervous tissue is a vital component of the human body's communication system, enabling us to perceive and respond to stimuli. However, like all other tissues, it is vulnerable to disorders and diseases that can significantly impact our neurological functioning.
Homeostatic Imbalances:
Alzheimer's disease manifests as a gradual decline in memory and cognitive abilities, attributed to the buildup of amyloid plaques and neurofibrillary tangles in the brain.
Parkinson's disease arises from the...
Homeostatic Imbalances:
Alzheimer's disease manifests as a gradual decline in memory and cognitive abilities, attributed to the buildup of amyloid plaques and neurofibrillary tangles in the brain.
Parkinson's disease arises from the...
3.0K
01:29Alzheimer Disease l: Introduction
21
Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
21
01:23Alzheimer Disease ll: Pathophysiology
35
Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and...
35
01:29Hepatic Encephalopathy
53
DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic...
53