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Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
Published on: March 30, 2015
Transporte de azúcares acoplados al sodio: efectos sobre las actividades intracelulares del sodio y la actividad de
Science (New York, N.Y.)
|June 15, 1984
Resumen
La galactosa aumenta temporalmente la actividad intracelular del sodio en el intestino delgado de Necturus. Esto mejora el transporte transcelular de sodio sin un aumento sostenido en los niveles intracelulares de sodio.
Área de la Ciencia:
- Fisiología Fisiología Fisiología.
- Biología celular Biología celular.
- Ciencias Gastrointestinales Ciencias Gastrointestinales
Sus antecedentes:
- La actividad intracelular del sodio ((Na) c) es crucial para las funciones celulares, incluido el transporte de nutrientes.
- Comprender la dinámica del sodio es clave para comprender los mecanismos de absorción intestinal.
Objetivo del estudio:
- Para investigar el efecto de la galactosa en la actividad intracelular del sodio en el intestino delgado de Necturus.
- Determinar la relación entre los cambios inducidos por la galactosa en (Na) c y el transporte transcelular de sodio.
Principales métodos:
- Medición de las actividades intracelulares del sodio ((Na) c) en el intestino delgado de Necturus.
- Adición de galactosa a la solución de baño de la mucosa.
- Monitorear los cambios en el transporte de (Na) c y el transporte transcelular de sodio.
Principales resultados:
- En ausencia de galactosa, (Na) c fue en promedio de 12 mmol/L.
- La adición de galactosa causó un aumento transitorio en (Na) c a 20 mmol / L en 2 minutos.
- El transporte transcelular de Na+ en estado estacionario aumentó de 3 a 4 veces con la galactosa, sin un aumento significativo en (Na) c.
Conclusiones:
- El aumento transitorio de (Na) c tras la adición de galactosa no se mantiene.
- El aumento de la actividad de la bomba basolateral en el estado estacionario es independiente del sodio intracelular elevado.
- La galactosa mejora el transporte de sodio a través de mecanismos distintos al aumento de la reserva intracelular de sodio.
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