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© Research
Publication : eLife

Identification of polarized macrophage subsets in zebrafish

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in eLife - 08 Jul 2015

Nguyen Chi M, Laplace-Builhe B, Travnickova J, Luz-Crawford P, Tejedor G, Phan QT, Duroux-Richard I, Levraud JP, Kissa K, Lutfalla G, Jorgensen C, Djouad F

Link to Pubmed [PMID] – 26154973

Elife 2015 Jul;4

While the mammalian macrophage phenotypes have been intensively studied in vitro, the dynamic of their phenotypic polarization has never been investigated in live vertebrates. We used the zebrafish as a live model to identify and trail macrophage subtypes. We generated a transgenic line whose macrophages expressing tnfa, a key feature of classically activated (M1) macrophages, express fluorescent proteins Tg(mpeg1:mCherryF/tnfa:eGFP-F). Using 4D-confocal microscopy, we showed that both aseptic wounding and E. coli inoculation triggered macrophage recruitment, some of which started to express tnfa. RT-qPCR on FACS-sorted tnfa+ and tnfa- macrophages showed that they respectively expressed M1 and alternatively activated (M2) mammalian markers. Fate tracing of tnfa+ macrophages during the time-course of inflammation demonstrated that pro-inflammatory macrophages converted into M2-like phenotype during the resolution step. Our results reveal the diversity and plasticity of zebrafish macrophage subsets and underline the similarities with mammalian macrophages proposing a new system to study macrophage functional dynamic.

http://www.ncbi.nlm.nih.gov/pubmed/26154973