Video Experimental Relacionado

Updated: Jun 18, 2025

Electrophoretic Delivery of γ-aminobutyric Acid GABA into Epileptic Focus Prevents Seizures in Mice

Electrophoretic Delivery of γ-aminobutyric Acid GABA into Epileptic Focus Prevents Seizures in Mice

Published on: May 16, 2019

El propofol rescata el encierro dependiente del voltaje de los mutantes de la epilepsia del canal HCN1

Elizabeth D Kim¹, Xiaoan Wu², Sangyun Lee¹

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

|July 31, 2024

Resumen

El propofol inhibe los canales HCN1 al unirse a una ranura entre las hélices transmembranales, ofreciendo nuevas vías para el tratamiento del dolor neuropático y la epilepsia.

Área de la Ciencia:

Biología estructural
La neurociencia
Farmacología

Sus antecedentes:

Los canales activados por hiperpolarización de nucleótidos cíclicos (HCN) son cruciales para la creación de ritmo y la señalización neuronal.
Los inhibidores del canal HCN1 son prometedores para el tratamiento del dolor neuropático y la epilepsia.
El anestésico propofol es un inhibidor de HCN1, pero su mecanismo estructural es desconocido.

Objetivo del estudio:

Para aclarar la base estructural de la inhibición del propofol de los canales HCN1.
Para entender cómo el propofol afecta a las puertas dependientes de voltaje.
Investigar el efecto del propofol en los polimorfismos HCN1 asociados a la epilepsia.

Principales métodos:

Microscopía criolectrónica de una sola partícula
Electrofisiología
Seguimiento del sensor de tensión en los canales de spHCN

Principales resultados:

El propofol se une a una ranura entre las hélices transmembrana S5 y S6, inhibiendo el HCN1.
El propofol restaura el cierre dependiente del voltaje en los mutantes HCN1 asociados a la epilepsia (M305L y D401H).
La inhibición del propofol es independiente de los cambios de conformación del sensor de tensión, estabilizando el acoplamiento sensor-poro de tensión.

Conclusiones:

El mecanismo del propofol implica la estabilización de la interfaz metionina-fenilalanina, crucial para el encierro dependiente de voltaje.
Este sitio de unión representa un objetivo potencial para el diseño de nuevos fármacos para las canalopatías HCN.

Más Videos Relacionados

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

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

Published on: January 29, 2018

Preparation of Acute Human Hippocampal Slices for Electrophysiological Recordings

Preparation of Acute Human Hippocampal Slices for Electrophysiological Recordings

Published on: May 7, 2020

Videos de Conceptos Relacionados

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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...

Antiepileptic Drugs: Calcium Channel Blockers

Antiepileptic Drugs: Calcium Channel Blockers

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...

Antiepileptic Drugs: GABAergic Pathway Potentiators

Antiepileptic Drugs: GABAergic Pathway Potentiators

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...

Antiepileptic Drugs: Potassium Channel Activators

Antiepileptic Drugs: Potassium Channel Activators

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...

Voltage-gated Ion Channels

Voltage-gated Ion Channels

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...