脳内の特定のアミロイドベータタンパク質組成は,記憶を損なう
Sylvain Lesné1, Ming Teng Koh, Linda Kotilinek
1Department of Neurology, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA.
Nature
|March 17, 2006
まとめ
溶解性アミロイドベータ集合体であるAbeta*56は,プラークが形成される前に老齢マウスの記憶喪失を引き起こします. この発見は,アベタ*56がアルツハイマー病における認知機能低下の早期の原動力である可能性があることを示唆しています.
科学分野:
- 神経科学は神経科学である.
- 老化に関する研究
- 分子生物学は分子生物学である.
背景:
- 年齢に関連した記憶の低下は,ニューロンの喪失に先立つシナプス変化としばしば関連しています.
- アルツハイマー病には神経変性やアミロイド斑があるが,早期の記憶障害はこれなしに起こる.
- Tg2576 マウスモデル アルツハイマー病は,ヒトアミロイド前駆タンパク質 (APP) 変種を発現させる.
研究 の 目的:
- 神経変性またはアミロイドーシスがないTg2576マウスの記憶低下の原因を調査する.
- 早期記憶障害の原因となる特定の分子種を特定する.
- 溶解性アミロイドベータの集合がプラーク形成と認知障害に先行するかどうかを判断する.
主な方法:
- 異なる年齢層 (若者,中年,高齢) のマウスモデルTg2576を使用した.
- 神経病理学 (ニューロン喪失,アミロイド斑) に関して記憶機能を評価.
- 溶解性アミロイドベータ集合体,特にアベタ*56.6を分離し,特徴づけました.
- 精製されたアベタ*56の記憶破壊効果を若いネズミでテストした.
主要な成果:
- 中年のTg2576マウスは,神経細胞の損失や重要なプラーク形成なしに記憶の欠陥を示した.
- 56kDaの溶解性アミロイドベータアセンブリ (Abeta*56) が,障害のあるマウスの蓄積種として特定されました.
- 若いネズミに浄化されたアベタ*56を投与すると,記憶障害が引き起こされた.
- アベタ*56の蓄積は,既知の神経病理学とは無関係に記憶障害と相関していた.
結論:
- アベタ*56は,老化しているTg2576マウスの記憶障害を引き起こす重要な要因です.
- この溶解性アミロイドベータ種は,プラーク形成とニューロン喪失の前に記憶を損なう.
- アベタ*56は,アルツハイマー病における認知機能の欠陥に対する早期の治療対象となる可能性がある.
さらに関連する動画
10:19Neurodegeneration in an Animal Model of Chronic Amyloid-beta Oligomer Infusion Is Counteracted by Antibody Treatment Infused with Osmotic Pumps
Published on: August 14, 2016
06:23Visualizing Axonal Growth Cone Collapse and Early Amyloid β Effects in Cultured Mouse Neurons
Published on: October 30, 2018
関連する概念動画
Amyloid Fibrils
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, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Amyloid Fibrils
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, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Alzheimer's Disease: Overview
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 and tau...
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ and tau...
Role of Neurotransmitters in Memory
Neurotransmitters are integral to the brain's communication system, enabling neurons to transmit signals across synapses. This chemical exchange underpins various cognitive functions, including memory processes. The role of neurotransmitters in memory is multifaceted, influencing the encoding, consolidation, and retrieval of memories through their action on different neural circuits.
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is critical for...
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is critical for...
Alzheimer Disease ll: Pathophysiology
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 microglia. Abnormal...
Dementia l: Introduction
Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
