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El papel inductor del factor de necrosis tumoral en el desarrollo de granulomas bactericidas durante la infección por
V Kindler1, A P Sappino, G E Grau
1Department of Pathology, University of Geneva, Centre Medical Universitaire, Switzerland.
Cell
|March 10, 1989
Resumen
El factor de necrosis tumoral (TNF) es crucial para la formación de granulomas y la eliminación bacteriana en ratones infectados con BCG. El bloqueo del TNF detiene el desarrollo del granuloma y promueve la regresión, destacando su papel en la defensa del huésped.
Área de la Ciencia:
- Inmunología Inmunología.
- Microbiología Microbiología.
Sus antecedentes:
- La formación de granulomas en el hígado es una respuesta clave del huésped a la infección por BCG.
- El factor de necrosis tumoral (TNF) se sintetiza localmente durante este proceso.
Objetivo del estudio:
- Investigar el papel del TNF en la formación de granulomas inducidos por BCG y la eliminación de micobacterias en ratones.
Principales métodos:
- Los ratones infectados con BCG fueron tratados con anticuerpos anti-TNF en diferentes momentos.
- Se evaluó el desarrollo del granuloma, el tamaño, la composición celular y la carga micobacteriana.
- Se analizaron los niveles de ARNm y proteínas TNF en los macrófagos.
Principales resultados:
- El tratamiento con anticuerpos anti-TNF inhibió significativamente la formación de granulomas y evitó la aparición de células epitelioides.
- Los granulomas establecidos regresaron después del tratamiento anti-TNF.
- El bloqueo del TNF suprimió la acumulación de ARNm y proteínas del TNF, que se reanudó después del aclaramiento de anticuerpos.
- El TNF mejoró su propia acumulación de ARNm en los macrófagos, particularmente en respuesta al interferón gamma.
Conclusiones:
- El TNF juega un papel crítico en el desarrollo y mantenimiento del granuloma durante la infección por BCG.
- El TNF parece actuar en un bucle de autoamplificación, promoviendo la acumulación de macrófagos y la diferenciación para la eliminación bacteriana.
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