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Identificación de un factor que vincula las células apoptóticas con los fagocitos
Rikinari Hanayama1, Masato Tanaka, Keiko Miwa
1Department of Genetics, Osaka University Medical School, 2-2 Yamada-oka, Suita, Osaka, 565-0871, Japan.
Nature
|May 10, 2002
Resumen
El glóbulo de grasa láctea-factor EGF 8 (MFG-E8) actúa como un puente crucial entre las células moribundas y los fagocitos. Esta proteína facilita el aclaramiento de las células apoptóticas, previniendo el daño tisular y la inflamación.
Área de la Ciencia:
- Biología celular Biología celular.
- Inmunología Inmunología.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Las células apoptóticas son eliminadas por los fagocitos para mantener la homeostasis del tejido.
- La fagocitosis de las células apoptóticas implica señales y receptores específicos.
- Los mecanismos moleculares que unen las células apoptóticas a los fagocitos requieren una aclaración.
Objetivo del estudio:
- Identificar y caracterizar un factor que interviene en el reconocimiento y la absorción de las células apoptóticas por los fagocitos.
- Para investigar el papel de los glóbulos grasos de la leche-factor EGF 8 (MFG-E8) en la eferocitosis.
Principales métodos:
- Detección de MFG-E8 en macrófagos activados.
- Evaluación de la unión de MFG-E8 a las células apoptóticas a través del reconocimiento de fosfatidilserina.
- Análisis de la fagocitosis mediada por MFG-E8 mediante el uso de alfa (v) beta (v) 3) integrina.
- Estudios de inhibición in vitro e in vivo en los que se utilizó un mutante MFG-E8 dominante negativo.
Principales resultados:
- MFG-E8, una glicoproteína secretada, es producida por los macrófagos activados.
- MFG-E8 se une específicamente a las células apoptóticas a través del reconocimiento de aminofosfolípidos como la fosfatidilserina.
- El MFG-E8 facilita la unión de las células apoptóticas a los fagocitos que expresan la integrina alfa (v) beta (III).
- Un MFG-E8 mutado inhibió la fagocitosis de las células apoptóticas in vitro e in vivo.
Conclusiones:
- MFG-E8 es un enlace molecular clave entre las células apoptóticas y los fagocitos.
- MFG-E8 media la eferocitosis uniendo la fosfatidilserina en las células apoptóticas con las integrinas de los fagocitos.
- MFG-E8 juega un papel crítico en el mantenimiento de la integridad del tejido durante la apoptosis.
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