胆固醇强化信号通过氨基粉症在它的突触损失之前受到损害
Simon Allard1, Marshall G Hussain Shuler2
1Kavli Neuroscience Discovery Institute, Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.
概括
阿尔茨海默病 (AD) 损害了对记忆至关重要的乙胆信号传递,甚至在突触退化之前. 这项研究揭示了乙胆作为一种强化信号,在AD小鼠中被粉样化症破坏.
科学领域:
- 神经科学是一个神经科学.
- 阿尔茨海默氏症疾病研究研究
- 胆固醇系统功能 胆固醇系统功能
背景情况:
- 阿尔茨海默氏症 (AD) 与粉样粉症和胆固醇系统功能障碍有关,影响学习和记忆.
- 在可塑性中乙胆信号传递的精确性质及其因粉样性病的改变仍然不太清楚.
研究的目的:
- 在临床前AD小鼠模型的视觉皮层中对预测,预测和预测事件的反应中光学测量乙胆释放.
- 调查粉症如何影响乙胆信号传递及其在突触退化之前的强化特性.
主要方法:
- 利用光学测量技术量化阿西胆释放概况在AD的小鼠模型与发展粉样化症.
- 检查了对视觉皮层中意外,预测和预测事件的反应中的乙胆信号.
- 鉴定和分析了三种不同阶段的粉样化症.
主要成果:
- 乙胆证明了强化信号,报告行为相关的结果,并根据经验调整释放配置文件.
- 含有粉样蛋白的小鼠的胆固醇反应在粉样蛋白症的三个阶段都受到损害,与对照组不同.
- 粉症降低了对意外奖励/惩罚的信号,并减弱了对预测线索和结果的乙胆反应的经验依赖性变化.
结论:
- 乙胆作为强化信号起作用,这种强化信号在胆系统退化之前因粉样化症而受损.
- 被破坏的胆固醇活性,包括暂时的过活性,可以作为阿尔茨海默病的早期功能生物标志物.
- 这些发现有助于更好地理解AD中的乙胆信号传递,并告知潜在的治疗干预时间.
相关概念视频
01:22Alzheimer's Disease: Treatment
212
Alzheimer's Disease (AD), a neurodegenerative disorder, is pathologically identified by amyloid plaques and neurofibrillary tangles composed of tau protein. AD pharmacotherapy aims to manage cognitive symptoms, delay disease progression, and treat behavioral symptoms. The treatment is primarily symptomatic and palliative, with no definitive disease-modifying therapy available. Cholinesterase inhibitors, including donepezil (Aricept), rivastigmine (Exelon), and galantamine (Razadyne), are...
212
01:26Alzheimer's Disease: Overview
517
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...
517
03:03Amyloid Fibrils
9.6K
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
9.6K
01:26Chemical Synapses
8.9K
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
8.9K
01:30Indirect-Acting Cholinergic Agonists: Pharmacological Actions
715
Indirect-acting cholinergic agonists, also known as anticholinesterases, exert their pharmacological effects by enhancing cholinergic transmission in various body parts, including the neuromuscular junction, autonomic cholinergic synapses, and the brain.
At the neuromuscular junction, these agents work by inhibiting the breakdown of acetylcholine, allowing it to remain bound to the receptor and bind to nearby receptors. This process leads to repetitive firing of the endplate, causing muscle...
At the neuromuscular junction, these agents work by inhibiting the breakdown of acetylcholine, allowing it to remain bound to the receptor and bind to nearby receptors. This process leads to repetitive firing of the endplate, causing muscle...
715
01:23Cholinergic Neurons: Neurotransmission
3.1K
Cholinergic neurotransmission involves the synthesis and the release of acetylcholine (ACh) in order to transmit nerve impulses across the synapse. The process begins with the synthesis of acetyl CoA, a precursor for ACh, from ATP, acetate, and coenzyme A in the mitochondria. Choline, another vital precursor, is transported inside the neuron through choline transporters, including high-affinity choline transporter CHT1, low-affinity choline transporter CTL1, and lower-affinity choline...
3.1K