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Fish Macrophages

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Abstract

Fish macrophages arise from haematopoietic progenitors in the head kidney and differentiate into tissue macrophage subtypes and/or self-maintaining resident populations. New insights into the ‘forms’ and functions of fish macrophages are provided by in vitro studies of macrophages purified by density gradients/adherence, as well as immortal macrophage-like cell lines and prolonged culture of primary macrophages. Polarisation states observed in mammalian macrophages, with associated changes in molecular and behavioural properties across a spectrum of two extremes, termed M1 and M2, also likely exist in fish macrophages. There is evidence that these different states are underpinned by immunometabolic changes. With the current advances in transcriptome sequencing, markers for macrophages and macrophage subtypes are slowly but definitively emerging in fish species. An ever-increasing toolbox of transgenic zebrafish lines allows for the elucidation of the multiple roles of macrophages in disease models, providing a more detailed insight into their in vivo function in fish.

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Abbreviations

angptl4:

angiopoietin-like 4

arg:

arginase

BCG:

Bacillus Calmette-Guérin

cAMP:

cyclic adenosine monophosphate

cfms:

csf-1 receptor

CRISPR:

clustered regularly interspaced short palindromic repeats

csf-1:

colony-stimulating factor-1 (see also M-CSF)

cxcl11:

C-X-C motif chemokine 11

dpf:

days post-fertilisation

eGFP:

enhanced green fluorescence protein

FACS:

fluorescence-activated cell sorter

GAL4:

galactokinase 4 transcription factor (see also UAS for combined system)

Hif1a:

hypoxia-inducible factor 1 alpha

hpf:

hours post-fertilisation

hsp70:

heat shock protein 70

ifnγ:

interferon gamma, cytokine

il-10:

interleukin-10

il-1b:

interleukin-1 beta, cytokine

il-4:

interleukin-4, cytokine

il-6:

interleukin-6, cytokine

inos:

inducible nitric oxide synthase

irf8:

interferon regulatory factor 8, transcription factor

irg1:

immune-responsive gene 1

LPS:

lipopolysaccharide

M1:

type 1 macrophage

M2:

type 2 macrophage

m-csf:

macrophage-colony-stimulating factor (see also CSF-1)

mfap4:

microfibril-associated protein 4

mm:

Mycobacterium marinum

mpeg-1:

macrophage-expressed gene 1

mrc1b:

mannose receptor 1b

NO:

nitric oxide

NOD:

nucleotide-binding oligomerisation domain

nos:

nitric oxide synthase

rag:

recombination-activating gene

ROS:

reactive oxygen species

spi1b:

proto-oncogene b

TALEN:

transcription activator-like effector nucleases

TB:

tuberculosis

TCA:

tricarboxylic acid cycle

tg:

transgenic

tgfb:

transforming growth factor beta

tnfa:

tumour necrosis factor alpha

UAS:

upstream-activating sequence (see also GAL4 for combined system)

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Acknowledgements

PME is funded by a Sir Henry Dale Fellowship jointly funded by the Wellcome Trust and the Royal Society (Grant Number 105570/Z/14/Z). GFW gratefully acknowledges the contributions of J. Petit, A.S. Wentzel and M. Forlenza.

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Correspondence to Geert F. Wiegertjes .

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Wiegertjes, G.F., Elks, P.M. (2022). Fish Macrophages. In: Buchmann, K., Secombes, C.J. (eds) Principles of Fish Immunology . Springer, Cham. https://doi.org/10.1007/978-3-030-85420-1_6

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