In vivo imaging of inflammasome activation reveals a subcapsular macrophage burst response that mobilizes innate and adaptive immunity

Pervinder Sagoo (1, 2) , Zacarias Garcia (1, 2) , Beatrice Breart (1, 2) , Fabrice Lemaître (1, 2) , David Michonneau (1, 2) , Matthew L Albert (3) , Yves Levy (4, 2, 5) , Philippe Bousso (1, 2, 3)

1 Dynamiques des Réponses Immunes
2 INSERM - Institut National de la Santé et de la Recherche Médicale
3 Immunobiologie des Cellules Dendritiques
4 VRI - Institut de Recherche sur le Vaccin
5 Service d'immunologie clinique [Créteil]

The inflammasome is activated in response to a variety of pathogens and has an important role in shaping adaptive immunity, yet the spatiotemporal orchestration of inflammasome activation in vivo and the mechanisms by which it promotes an effective immune response are not fully understood. Using an in vivo reporter to visualize inflammasome assembly, we establish the distribution, kinetics and propagation of the inflammasome response to a local viral infection. We show that modified vaccinia Ankara virus induces inflammasome activation in subcapsular sinus (SCS) macrophages, which is immediately followed by cell death and release of extracellular ASC specks. This transient inflammasome signaling in the lymph node generates a robust influx of inflammatory cells and mobilizes T cells from the circulation to increase the magnitude of T cell responses. We propose that after infection, SCS macrophages deliver a burst response of inflammasome activity and cell death that translates into the broadening of T cell responses, identifying an important aspect of inflammasome-driven vaccination strategies.

Domains: Life Sciences [q-bio]

Pervinder Sagoo, Zacarias Garcia, Beatrice Breart, Fabrice Lemaître, David Michonneau, et al.. In vivo imaging of inflammasome activation reveals a subcapsular macrophage burst response that mobilizes innate and adaptive immunity. Nature Medicine, 2015, 22 (1), pp.64-71. ⟨10.1038/nm.4016⟩. ⟨pasteur-01253201⟩