eIF2α酸化双向调节从短期到长期的突触可塑性和记忆的切换.
Mauro Costa-Mattioli1, Delphine Gobert, Elad Stern
1Department of Biochemistry and McGill Cancer Center, McGill University, Montreal, Quebec, Canada. mauro.costa-mattioli@mail.mcgill.ca
Cell
|April 10, 2007
概括
改变eIF2α酸化会影响记忆和突触可塑性. 减少酸化会增强记忆力和晚期长期潜能 (L-LTP),而增加酸化会损害它们.
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
- 突触性可塑性 突触性可塑性
背景情况:
- 晚期长期增强 (LTP) 和长期记忆 (LTM) 取决于新的基因表达.
- 控制这些过程的精确分子机制仍然不完全理解.
- 化真核启动因子2α (eIF2alpha) 全球抑制转化,但有选择地增强ATF4,一种抑制CREB介导的晚期LTP (L-LTP) 和LTM的抑制剂.
研究的目的:
- 研究eIF2α酸化在突触可塑性和行为学习中的作用.
- 阐明eIF2α酸化在L-LTP和LTM形成中的调节功能.
主要方法:
- 在小鼠中使用了药物遗传双向方法.
- 在eIF2alpha(+/S51A) 小鼠中研究了减少eIF2alpha酸化的作用.
- 使用海马体中的小分子Sal003研究了eIF2alpha酸化增加的影响.
主要成果:
- 在eIF2alpha(+/S51A) 小鼠中减少了eIF2alpha酸化,降低了L-LTP的值,并增强了记忆力.
- 通过Sal003注射增加eIF2α酸化只导致早期LTP和LTM受损.
- 这些发现表明eIF2alpha酸化部位是关键的调节器.
结论:
- eIF2α酸化是控制L-LTP和LTM的关键分子开关.
- 调节eIF2alpha酸化为记忆障碍提供了一个潜在的治疗点.
- eIF2α酸化的平衡对于记忆巩固和突触可塑性至关重要.
相关概念视频
Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Long-term Potentiation
Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when presynaptic neurons...
Hebbian LTP
LTP can occur when presynaptic neurons...
Long-term Depression
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 time, all...
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Long-term Depression
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.
Calmodulin-dependent Signaling
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
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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.
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