プロポフォールは,HCN1チャネルエピレプシー変異体の電圧依存ゲートを救います

Elizabeth D Kim¹, Xiaoan Wu², Sangyun Lee¹

¹Department of Anesthesiology, Weill Cornell Medical College, New York, NY, USA.

Nature

|July 31, 2024

まとめ

プロポポールは,トランスメブランヘリクスの間の溝に結合することによって,HCN1チャンネルを阻害し,神経疾患の痛みとの治療に新しい道を開きます.

科学分野:

構造生物学
神経科学
薬理学について

背景:

ハイパーポラライゼーションで活性化されたサイクルヌクレオチドゲート (HCN) チャンネルは,ペースメーカーとニューラルシグナル伝達に不可欠です.
HCN1チャネル阻害剤は神経疾患の痛みとの治療に有望である.
麻酔剤プロポフォルはHCN1阻害剤であるが,その構造的メカニズムは不明である.

研究の目的:

HCN1チャネルのプロポホル阻害の構造的基礎を明らかにする.
プロポフォルが電圧依存ゲーティングにどう影響するかを理解するためです
に関連したHCN1ポリモルフィズムに対するプロポポールの効果を調査する.

主な方法:

単粒子冷凍電子顕微鏡
電気生理学
spHCNチャネルにおける電圧センサー追跡

主要な成果:

プロポフォルはS5とS6のトランスメブランヘリクスの間の溝に結合し,HCN1を阻害する.
プロポフォールは,エピレプシーに関連したHCN1変異体 (M305LとD401H) の電圧依存閉塞を回復します.
プロポポールの阻害は,電圧センサーの形状の変化とは無関係で,電圧センサーと毛穴の結合を安定させる.

結論:

プロポポールのメカニズムは,メチオニン-フェニララニンのインターフェースを安定させ,電圧依存ゲートに不可欠です.
この結合部位は,HCNチャネル病変に対する新薬の設計の潜在的なターゲットです.

さらに関連する動画

11:54

Simultaneous Video-EEG-ECG Monitoring to Identify Neurocardiac Dysfunction in Mouse Models of Epilepsy

Published on: January 29, 2018

25.4K

07:31

Preparation of Acute Human Hippocampal Slices for Electrophysiological Recordings

Published on: May 7, 2020

7.2K

関連する概念動画

01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

2.2K

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...

2.2K

01:17

Antiepileptic Drugs: Calcium Channel Blockers

353

Calcium channel blockers, a class of antiepileptic drugs, regulate the flow of calcium ions within neurons.
Calcium channel blockers exert their antiepileptic effects by targeting T-type calcium channels, which are integral to transmitting nerve signals in the central nervous system. These channels allow the passage of calcium ions, which are vital for neuronal communication. By inhibiting T-type calcium channels, calcium channel blockers effectively reduce the release of neurotransmitters and...

353

01:18

Antiepileptic Drugs: GABAergic Pathway Potentiators

363

γ-aminobutyric acid or GABA, plays a pivotal role as an inhibitory neurotransmitter in the brain. GABA pathway potentiators, also known as GABAergic drugs, are a class of pharmaceutical agents designed to enhance the functioning of the GABAergic system. These medications primarily treat epilepsy, a neurological disorder characterized by recurrent seizures.
The key GABA pathway potentiators used in epilepsy management are as follows.
Benzodiazepines are a well-known class of drugs used for...

363

01:20

Antiepileptic Drugs: Potassium Channel Activators

157

Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
Ezogabine has gained approval as an adjunctive treatment...

157

01:26

Voltage-gated Ion Channels

8.1K

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...