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Long-term Depression01:03

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...
Long-term Depression01:05

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.
Role of Neurotransmitters in Memory01:23

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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Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists01:30

Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists

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. They...
Role of Amygdala in Memory01:16

Role of Amygdala in Memory

The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
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HDAC2は,記憶形成とシナプス可塑性を否定的に調節する.

Ji-Song Guan1, Stephen J Haggarty, Emanuela Giacometti

  • 1Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences.

Nature
|May 9, 2009
PubMed
まとめ
この要約は機械生成です。

ヒストン脱酸化酵素2 (HDAC2) は,シナプス密度を下げることで,学習と記憶を否定的に調節する. HDAC2を阻害すると,記憶が強化され,記憶障害に対するHDAC2選択薬が示唆される.

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Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology
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Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue
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Published on: November 30, 2018

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Preparation of Acute Hippocampal Slices from Rats and Transgenic Mice for the Study of Synaptic Alterations during Aging and Amyloid Pathology
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Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue
09:43

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科学分野:

  • 神経科学は神経科学である.
  • エピジェネティクス エピジェネティクス
  • 分子生物学は分子生物学である.

背景:

  • クロマチンの改変,特にヒストンのアセチル化が,記憶形成に不可欠である.
  • ヒストン脱セチラーゼ阻害剤 (HDACis) は,様々なモデルで学習と記憶を強化します.

研究 の 目的:

  • 認知機能強化に関与する特定のヒストン脱セチラゼ (HDAC) 家族のメンバーを特定する.
  • シナプス性可塑性,学習,記憶におけるHDAC2の役割を調査する.

主な方法:

  • ニューロン特異的な過剰表現またはHDAC2.2の欠乏症を持つマウスを生成した.
  • HDAC阻害剤 (HDACis) を投与した慢性治療.
  • dendritic 脊椎の密度,シナプス数,シナプス可塑性,および記憶形成を評価しました.

主要な成果:

  • HDAC2のニューロン特異的過剰発現は,デンドリティック脊椎の密度,シナプスの数,および記憶を低下させた.
  • Hdac2欠乏症は,シナプス数を増加させ,HDACi効果を模倣して記憶を促進しました.
  • HDACi治療は,HDAC2過剰発現したマウスの記憶欠陥を改善したが,Hdac2欠乏したマウスの記憶をさらに改善することはなかった.
  • HDAC2は,シナプス可塑性に関与する遺伝子のプロモーターと関連することが判明しました.

結論:

  • HDAC2は,シナプス可塑性および神経回路を調節することによって,学習と記憶を否定的に調節します.
  • HDAC2を選択性阻害剤で標的化することは,記憶障害障害に対する治療戦略を提供することができる.