Liver type 1 innate lymphoid cells develop locally via an interferon-γ–dependent loop

Lu Bai (1) , Margaux Vienne (2) , Ling Tang (1) , Yann Kerdiles (2) , Marion Etiennot (2) , Bertrand Escalière (2) , Justine Galluso (2) , Haiming Wei (1) , Rui Sun (1, 3) , Eric Vivier (2, 4, 5) , Hui Peng (1) , Zhigang Tian (1)

1 USTC - University of Science and Technology of China [Hefei]
2 CIML - Centre d'Immunologie de Marseille - Luminy
3 UCAS - University of Chinese Academy of Sciences [Beijing]
4 Innate Pharma
5 TIMONE - Hôpital de la Timone [CHU - APHM]

The pathways that lead to the development of tissue-resident lymphocytes, including liver type 1 innate lymphoid cells (ILC1s), remain unclear. We show here that the adult mouse liver contains Lin − Sca-1 + Mac-1 + hematopoietic stem cells derived from the fetal liver. This population includes Lin − CD122 + CD49a + progenitors that can generate liver ILC1s but not conventional natural killer cells. Interferon-γ (IFN-γ) production by the liver ILC1s themselves promotes the development of these cells in situ, through effects on their IFN-γR + liver progenitors. Thus, an IFN-γ–dependent loop drives liver ILC1 development in situ, highlighting the contribution of extramedullary hematopoiesis to regional immune composition within the liver.

Domaines: Sciences du Vivant [q-bio]

Lu Bai, Margaux Vienne, Ling Tang, Yann Kerdiles, Marion Etiennot, et al.. Liver type 1 innate lymphoid cells develop locally via an interferon-γ–dependent loop. Science, 2021, 371 (6536), pp.eaba4177. ⟨10.1126/science.aba4177⟩. ⟨hal-03375153⟩