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La inmunidad innata y la inmunidad adaptativa cooperan de manera flexible para mantener el mutualismo
Emma Slack1, Siegfried Hapfelmeier, Bärbel Stecher
1Farncombe Family Digestive Health Research Institute, McMaster University, Hamilton, ON L8S 4L8, Canada. andrew.macpherson@insel.ch
Science (New York, N.Y.)
|August 1, 2009
Resumen
La inmunodeficiencia innata en ratones desencadena la inmunidad adaptativa, lo que lleva a los anticuerpos contra los microbios intestinales. Esta respuesta de anticuerpos es crucial para mantener el equilibrio huésped-microbio cuando fallan las defensas innatas.
Área de la Ciencia:
- Inmunología Inmunología.
- Microbiología Microbiología.
- Gastroenterología y Gastroenterología.
Sus antecedentes:
- El intestino inferior alberga una densa población de bacterias comensales, significativamente más numerosas que las células huésped.
- Comprender los mecanismos inmunológicos que controlan la microbiota intestinal es vital para mantener el mutualismo huésped-microbio.
Objetivo del estudio:
- Investigar la interacción entre la inmunidad innata y la adaptativa en el control de la microbiota intestinal.
- Determinar el papel de las vías inmunitarias específicas en la prevención de la propagación microbiana desde el intestino.
Principales métodos:
- Se utilizaron modelos de ratones con deficiencias en las funciones inmunológicas innatas clave, incluida la señalización de receptores similares a Toll y la producción de ráfagas oxidativas.
- Evaluó las respuestas inmunes resultantes, centrándose en la producción de anticuerpos y su importancia funcional in vivo.
- Examinó la relación anfitrión-comensal en condiciones de inmunidad innata comprometida.
Principales resultados:
- Los ratones que carecían de funciones inmunológicas innatas críticas desarrollaron espontáneamente anticuerpos séricos de alto título contra su microbiota comensal.
- Estas respuestas de anticuerpos inducidas fueron esenciales para mantener el mutualismo comensal huésped-anfitrión a pesar de los defectos inmunes innatos.
- Demostró un continuo flexible entre las respuestas inmunes innatas y adaptativas en la contención microbiana.
Conclusiones:
- Las respuestas inmunes adaptativas, particularmente la producción de anticuerpos, pueden compensar las deficiencias en la inmunidad innata para controlar la microbiota intestinal.
- La hiperactivación inmune espontánea contra los comensales, secundaria a la insuficiencia inmune innata, ofrece información sobre las enfermedades inflamatorias vinculadas a la disfunción inmune.
- Destaca el papel crítico de un sistema inmunológico equilibrado en el mantenimiento de la homeostasis intestinal.
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