在阿尔茨海默病小鼠模型中,Akt激活改善了海马体依赖性记忆和活动依赖性突触蛋白合成的缺陷
Reddy Peera Kommaddi1, Ruturaj Gowaikar2, Haseena P A3
1Centre for Brain Research, Indian Institute of Science, Bangalore, India.
The Journal of biological chemistry
|January 5, 2024
概括
早期阿尔茨海默氏症 (AD) 通过Akt/mTOR通路调节障碍损害了突触蛋白质合成. 在AD小鼠中激活Akt恢复了记忆和突触功能,突出了Akt作为治疗目标.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 病理学 病理学 病理学
背景情况:
- 拉巴胺素 (mTOR) 途径的Akt/机制性标调节突触蛋白质合成和可塑性.
- 这些途径的失调与阿尔茨海默氏症 (AD) 病原发生有关.
- 早期AD中突触蛋白合成受损的基础分子机制尚未完全理解.
研究的目的:
- 在前症状AD小鼠模型中研究Akt1/mTOR信号级联和突触蛋白质合成.
- 阐明Akt1在突触蛋白质合成和记忆回忆中的作用.
- 评估阿克特激活在阿尔茨海默病中的治疗潜力.
主要方法:
- 野生类型 (WT) 和粉样蛋白前体蛋白/前林-1 (APP/PS1) 小鼠海马中的Akt1/mTOR信号分子 (pAkt1,pmTOR,ps6,p4E-BP1) 的表征.
- 在synaptoneurosomes中评估活动依赖的突触蛋白质合成.
- 在Akt信号 (SC79激活剂,MK2206抑制剂) 的药理学操纵后,使用行为测试评估记忆回忆.
主要成果:
- 没有症状的APP/PS1小鼠在海马和突触体中显示了关键的Akt1/mTOR信号分子水平的降低.
- 在症状前和成年APP/PS1小鼠中观察到活动依赖的突触蛋白合成受损.
- Akt1下调抑制了海马神经元中的突触蛋白质合成.
- 将Akt激活剂 (SC79) 给3个月大的APP/PS1小鼠,可挽救记忆缺陷并恢复突触蛋白质合成.
- 在WT小鼠中的Akt抑制导致记忆缺陷.
结论:
- 在海马体中Akt1/mTOR通路的调节失调有助于早期AD的记忆缺陷和突触蛋白质合成受损.
- 在AD模型中,Akt激活显示了改善AD模型中的认知和突触缺陷的治疗潜力.
更多相关视频
08:01Intracerebroventricular Injection of Amyloid-β Peptides in Normal Mice to Acutely Induce Alzheimer-like Cognitive Deficits
Published on: March 16, 2016
42.4K
04:41Preparation of Oligomeric β-amyloid1-42 and Induction of Synaptic Plasticity Impairment on Hippocampal Slices
Published on: July 14, 2010
23.2K
相关概念视频
Alzheimer's Disease: Treatment
195
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...
195
Alzheimer's Disease: Overview
491
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...
491
Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists
127
Cognitive enhancers, also known as "smart drugs," are substances used to enhance memory, mental alertness, and concentration. These can be natural or synthetic and improve cognition in conditions like Alzheimer's disease (AD) and other neurodegenerative diseases. Some common examples include caffeine, amphetamines, methylphenidate, modafinil, arecoline, donepezil, vortioxetine, and piracetam. These enhancers work on the principle of synaptic plasticity and altered circuit function.
127
