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El movimiento de la membrana inducido por la tensión induce el movimiento de la membrana
P C Zhang1, A M Keleshian, F Sachs
1HHMI Center for Single Molecule Biophysics, State University of New York at Buffalo, Buffalo, New York 14214, USA.
Nature
|September 28, 2001
Resumen
La tensión transmembrana impulsa el movimiento celular al alterar la tensión de la membrana. Esta electromotilidad, influenciada por la rigidez celular y la carga superficial, se confirmó utilizando microscopía de fuerza atómica en células HEK293.
Área de la Ciencia:
- La biofísica es la biofísica.
- Electrofisiología Celular Electrofisiología celular
Sus antecedentes:
- La termodinámica predice que la tensión transmembrana afecta la tensión de la membrana, lo que lleva al movimiento celular.
- La rigidez celular y los potenciales de superficie gobiernan la dirección y la magnitud de este movimiento.
Objetivo del estudio:
- Para confirmar experimentalmente las predicciones termodinámicas del movimiento celular inducido por el voltaje.
- Para cuantificar la relación entre el voltaje, las propiedades de la célula y el movimiento.
- Investigar el papel de la carga superficial y el efecto del salicilato en la electromobilidad.
Principales métodos:
- Se utilizó la microscopía de fuerza atómica (AFM) para rastrear el movimiento de las células HEK293 sujetas a tensión.
- Realizó experimentos en soluciones de diferentes intensidades iónicas.
- Aplicó un modelo físico para estimar las densidades de carga superficial.
Principales resultados:
- Confirmado movimiento de la célula inducido por tensión (electromotilidad) en células HEK293.
- Movimiento observado hacia afuera en solución salina normal y movimiento hacia adentro en soluciones de baja resistencia iónica.
- La amplitud de movimiento está correlacionada con el voltaje (~1 nm/100 mV) y la profundidad de la hendidura.
- Las densidades de carga superficial externa e interna estimadas.
- El salicilato inhibió la electromotilidad al aumentar la carga externa, lo que sugiere una posible reevaluación del papel de la prestina.
Conclusiones:
- La evidencia experimental apoya las predicciones termodinámicas del movimiento celular impulsado por voltaje de transmembrana.
- La electromotilidad celular depende de la fuerza iónica, el voltaje y las propiedades mecánicas celulares.
- La carga superficial juega un papel crítico en la modulación de la electromobilidad, con implicaciones para las proteínas mecanicamente sensibles como la prestina.
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