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El receptor polimérico de inmunoglobulina expresado en las células MDCK transcita las IgAA
Cell
|August 15, 1986
Resumen
Este estudio demuestra que el receptor polimérico de inmunoglobulina (pIgR) funciona in vitro para la transcitosis de IgA. El receptor transporta la IgA dimérica y su fragmento escindido, el componente secretor, a través de las células epiteliales.
Área de la Ciencia:
- Biología celular Biología celular.
- Inmunología Inmunología.
- El transporte epitelial es
Sus antecedentes:
- El receptor polimérico de inmunoglobulina (pIgR) media el transporte de IgA dimérico a través de las células epiteliales.
- Comprender la función de la pIgR es crucial para la inmunidad de la mucosa y la protección mediada por IgA.
Objetivo del estudio:
- Establecer un sistema in vitro para el análisis cuantitativo de la transcitosis IgA.
- Para investigar la vía de transporte y la cinética de pIgR e IgA.
Principales métodos:
- La expresión del ADNc pIgR de conejo en las células epiteliales polarizadas del riñón canino Madin-Darby (MDCK).
- Análisis cuantitativo del transporte de receptores y ligandos a través de la monocapa epitelial.
Principales resultados:
- El pIgR recién sintetizado se dirige principalmente a la superficie basolateral antes de la liberación apical.
- El transporte del receptor y la subsiguiente escisión al componente secretor son independientes de la unión del ligando (IgA).
- La transcitosis de la IgA unida exhibe un tiempo de semidesintegración (t 1/2) de 30 minutos.
Conclusiones:
- El sistema in vitro establecido recapitula con precisión la transcitosis de IgA mediada por pIgR mediada por pIgR in vivo.
- El transporte de pIgR es un proceso constitutivo que no requiere la unión de IgA.
- La rápida transcitosis de IgA pone de relieve la vigilancia inmune eficaz de la mucosa.
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