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La regulación de la maduración del fagosoma mediante señales de receptores tipo peaje
J Magarian Blander1, Ruslan Medzhitov
1Howard Hughes Medical Institute, Section of Immunobiology, Yale University School of Medicine, New Haven, Connecticut 06520, USA.
Science (New York, N.Y.)
|May 15, 2004
Resumen
La señalización del receptor tipo peaje (TLR) regula la fagocitosis de las bacterias, lo que afecta la internalización celular y la maduración del fagosoma. Esta vía es crucial para la defensa del huésped, pero no para eliminar las células apoptóticas.
Área de la Ciencia:
- Biología celular Biología celular.
- Inmunología Inmunología.
- Microbiología Microbiología.
Sus antecedentes:
- La fagocitosis es vital para la defensa del huésped y la limpieza de desechos celulares en metazoos.
- Las células microbianas y apoptóticas comparten una vía común hacia los lisosomas para la degradación.
Objetivo del estudio:
- Para investigar el papel de la señalización del receptor Toll-like (TLR) en la regulación de la fagocitosis.
- Determinar cómo la señalización TLR influye en la internalización y la maduración del fagosoma de las células microbianas y apoptóticas.
Principales métodos:
- Estudió la fagocitosis en metazoos superiores.
- Investigó el impacto de la activación de la vía de señalización TLR por bacterias y células apoptóticas.
- Analizó los pasos de fagocitosis, incluida la internalización y la maduración del fagosoma.
- Modos constitutivos e inducibles observados de la maduración del fagosoma.
Principales resultados:
- La activación de la señalización TLR por bacterias, no por células apoptóticas, regulado por múltiples pasos de fagocitosis.
- La fagocitosis de las bacterias se vio significativamente afectada en ausencia de señalización TLR.
- Se identificaron dos modos distintos de maduración del fagosoma (constitutivo e inducible).
- La activación de estos modos de maduración dependía de la capacidad de la carga para activar la señalización TLR.
Conclusiones:
- La señalización TLR es un regulador crítico de la fagocitosis bacteriana, que afecta tanto a la captación como al procesamiento intracelular.
- La vía de maduración del fagosoma está regulada diferencialmente en función de la naturaleza de la carga y su capacidad para activar las TLR.
- Los hallazgos destacan un mecanismo específico por el cual el sistema inmunológico distingue entre los patógenos y el material apoptótico auto-derivado durante la fagocitosis.
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