Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 1 de 1
Filtrar
Más filtros

Base de datos
Tipo del documento
País de afiliación
Intervalo de año de publicación
1.
Cell Rep ; 42(1): 111943, 2023 01 31.
Artículo en Inglés | MEDLINE | ID: mdl-36640310

RESUMEN

The endoplasmic reticulum (ER) is a tortuous organelle that spans throughout a cell with a continuous membrane containing ion channels, pumps, and transporters. It is unclear if stimuli that gate ER ion channels trigger substantial membrane potential fluctuations and if those fluctuations spread beyond their site of origin. Here, we visualize ER membrane potential dynamics in HEK cells and cultured rat hippocampal neurons by targeting a genetically encoded voltage indicator specifically to the ER membrane. We report the existence of clear cell-type- and stimulus-specific ER membrane potential fluctuations. In neurons, direct stimulation of ER ryanodine receptors generates depolarizations that scale linearly with stimulus strength and reach tens of millivolts. However, ER potentials do not spread beyond the site of receptor activation, exhibiting steep attenuation that is exacerbated by intracellular large conductance K+ channels. Thus, segments of ER can generate large depolarizations that are actively restricted from impacting nearby, contiguous membrane.


Asunto(s)
Retículo Endoplásmico , Neuronas , Animales , Ratas , Calcio/metabolismo , Retículo Endoplásmico/metabolismo , Hipocampo/metabolismo , Potenciales de la Membrana/fisiología , Neuronas/metabolismo , Canal Liberador de Calcio Receptor de Rianodina/metabolismo , Humanos , Línea Celular
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA