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Using Mass Cytometry and In vivo Imaging to Study Emergency Repopulation of Immune Cells in Murine Liver


ABSTRACT: Macrophages and dendritic cells are phagocytes present in almost all tissues in mammals and play a pivotal role for tissue homeostasis and during immune responses. Liver phagocytes play a pivotal role in host immune responses and exquisite mechanisms are necessary to govern the density and the location of the different hepatic leukocytes. However in catastrophic events including trauma, infections or toxin ingestion, many of the liver phagocytes can be wiped out leaving large areas devoid of these cells. Here we used a unique combination of mass cytometry (CyTOF), gene expression and liver intravital approaches to precisely determine phagocytic populations within the liver and the functional consequences of their replenishment by myeloid precursors. While Kupffer cells were exclusively located in the sinusoidal lumen, we identified a population of dendritic cells that was mainly located under the liver capsule. After full depletion of dendritic and Kupffer cells, intravascular myeloid precursors replenished location, density and function of both populations. However, these emergency repopulated livers were dysfunctional in their ability to respond to injury and to clear bacteria for at least 30 days. After this “educational period”, new phagocytes returned to normal response to injury and bacterial trapping. Conclusions: Our data shed light on the liver’s ability to locally shape phagocyte precursors into two vastly different immune cells localized to two fundamentally different tissue compartments.

ORGANISM(S): Mus musculus

PROVIDER: GSE81645 | GEO | 2016/06/12

SECONDARY ACCESSION(S): PRJNA322189

REPOSITORIES: GEO

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