PSD-95は刺激性シナプスの成熟に関与している
A E El-Husseini1, E Schnell, D M Chetkovich
1Department of Physiology, University of California, San Francisco 94143, USA.
まとめ
ポストシナプス密度-95 (PSD-95) タンパク質の過剰発現は,海馬の神経細胞におけるグルタマタージックシナプスの成熟を促します. このタンパク質はシナプスの発達を指揮し,受容体活性,シナプス前端子,および状脊椎の成長を高めます.
科学分野:
- 神経科学は神経科学である.
- 分子生物学は分子生物学である.
- シナプスの可塑性
背景:
- ポストシナプス密度-95 (PSD-95) は,ニューロンのシナプスにおける重要な支架タンパク質である.
- シナプスの発達と機能におけるその正確な役割は,まだ完全に理解されていません.
研究 の 目的:
- グルタマタージックシナプスの成熟におけるPSD-95の機能を調査する.
- シナプス発達の過程におけるPSD-95の役割の基礎となる分子メカニズムを決定する.
主な方法:
- 培養ヒポカンパニューロンにおけるPSD-95の過剰発現.
- ポストシナプスグルタミン酸受容体のクラスタ化と活性に関する分析.
- 前シナプス末端成熟の評価.
- 樹状脊椎の形状と数値の評価.
主要な成果:
- PSD-95の過剰発現は,グルタマタージックシナプスの成熟を促した.
- 強化されたポストシナプスクラスタリングとグルタミン酸受容体の活性が観察されました.
- プレシナプス端末成熟とデンドリート脊椎の数とサイズの増加も誘発された.
- これらの効果はPSD-95のシナプス・クラスタリングに依存しているが,ガニラートキナーゼドメインには依存していない.
結論:
- PSD-95はシナプス発達の調整に重要な役割を果たしています.
- 研究結果は,PSD-95がシナプス安定化と可塑性に関与することを示唆しています.
- PSD-95はシナプス構造と機能のマスターレギュレーターとして機能します.
さらに関連する動画
09:24High-Resolution Quantitative Immunogold Analysis of Membrane Receptors at Retinal Ribbon Synapses
Published on: February 18, 2016
09:07Electroconvulsive Seizures in Rats and Fractionation of Their Hippocampi to Examine Seizure-induced Changes in Postsynaptic Density Proteins
Published on: August 15, 2017
関連する概念動画
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 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.
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...
Calcium Ion Concentration Mechanism
If over time, all...
Postsynaptic Potential (PSP)
Postsynaptic potential (PSP) refers to a change in the electrical potential of a neuron when neurotransmitters released by presynaptic neurons bind to postsynaptic receptors. This potential can either be excitatory, leading to depolarization and ultimately action potential generation, or inhibitory, leading to hyperpolarization and suppression of the postsynaptic neuron.
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
There are two types of receptors: ionotropic and metabotropic.
The ionotropic receptor is the membrane protein that has an...
Integration of Synaptic Events
Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability to...
