海马抑制性内神经元特异性DREADDs治疗改变mTORC1-4E-BP信号,并损害记忆形成
Ziying Huang1,2, Niaz Mahmood1,2, Jean-Claude Lacaille3
1Department of Biochemistry, McGill University, Montreal, Quebec, Canada.
Journal of neurochemistry
|March 24, 2025
概括
在海马抑制神经元中准拉巴胺素复合体1 (mTORC1) 途径的机械性标对记忆形成至关重要. 在学习后立即操纵这些特定神经元中的mTORC1信号会损害长期记忆.
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
- 细胞生物学 细胞生物学
背景情况:
- 通过拉巴胺素复合体1 (mTORC1) 的机械性点控制蛋白质合成,对学习和记忆至关重要.
- 在记忆形成过程中mTORC1通路的精确细胞类型特定和时空调节仍然不完全理解.
研究的目的:
- 研究mTORC1信号传递在海马体CA1激发和抑制神经元中在记忆形成过程中的细胞类型特定作用.
- 阐明针对性mTORC1路径调制对长期记忆的影响.
主要方法:
- 完全由设计药物 (DREADDs) 激活的利用设计受体,特别是hM3D ((Gq) 和hM4D ((Gi),在成年小鼠的海马体CA1兴奋或抑制神经元中表达.
- 用克洛扎-N-氧化物 (CNO) 激活或禁用DREADDs,从而调节mTORC1信号.
- 通过测量其位的酸化来评估mTORC1通路活性,即真核细胞启动因子4E结合蛋白 (4E-BP1/2) 和核糖体蛋白S6 (S6).
- 评估了DREADD激活对长期记忆形成的影响,使用已建立的记忆任务.
主要成果:
- 在海马内部神经元中mTORC1信号的激活或非激活通过4E-BP1/2和S6酸化的变化得到证实.
- 在训练后立即在抑制神经元中针对mTORC1信号的定向激活或非激活显著损害了长期记忆的形成.
- 刺激神经元中mTORC1信号的调节没有影响长期记忆的形成.
结论:
- hippocampal 抑制性内部神经元中的活动依赖的 mTORC1-4E-BP1/2 信号传递对于记忆形成至关重要.
- 在学习后的抑制性神经元中,mTORC1信号的特定时间操纵会破坏记忆巩固.
- 这些发现突出了神经元亚型在与记忆相关的分子通路中的不同作用.
更多相关视频
07:43Immunohistochemical Visualization of Hippocampal Neuron Activity After Spatial Learning in a Mouse Model of Neurodevelopmental Disorders
Published on: May 12, 2015
11.2K
09:45Motor and Hippocampal Dependent Spatial Learning and Reference Memory Assessment in a Transgenic Rat Model of Alzheimer's Disease with Stroke
Published on: March 22, 2016
10.2K
相关概念视频
Long-term Depression
2.5K
Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
If over...
Calcium Ion Concentration Mechanism
If over...
2.5K
Role of Neurotransmitters in Memory
351
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...
Glutamate and Synaptic Plasticity
Glutamate, the brain's main excitatory neurotransmitter, is...
351
