Artículo del mes
mayo 2017

Local amplifiers of IL-4Rα-mediated macrophage activation promote repair in lung and liver

Nuestro estudio demuestra la existencia de amplificadores específicos de tejido necesarios para promover la activación y proliferación de macrófagos mediada por IL-4Ra. IL-4 da lugar a la producción de proteínas estructuralmente similares, SP-A en pulmón y C1q en hígado, y a la expresión de su receptor (myosin 18A), impulsando la activación efectiva de macrófagos para frenar la lesión y favorecer la reparación del tejido después de la infección con parásitos o bacterias patógenas.
Resumen
The type 2 immune response controls helminth infection and maintains tissue homeostasis but can lead to allergy and fibrosis if not adequately regulated. We have discovered local tissue-specific amplifiers of type-2 mediated-macrophage activation. In the lung, surfactant protein A (SP-A) enhanced IL-4-dependent macrophage proliferation and activation, accelerating parasite clearance and reducing pulmonary injury following infection with a lung-migrating helminth. In the peritoneal cavity and liver, C1q enhancement of type 2 macrophage activation was required for liver repair following bacterial infection, but resulted in fibrosis following peritoneal dialysis. IL-4 drives production of these structurally related defense collagens, SP-A and C1q, and the expression of their receptor, myosin 18A. These findings reveal the existence within different tissues of an amplification system needed for local type 2 responses.
Sobre el grupo investigador