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Published in: Journal of Neuroinflammation 1/2018

Open Access 01-12-2018 | Research

Targeted intracerebral delivery of the anti-inflammatory cytokine IL13 promotes alternative activation of both microglia and macrophages after stroke

Authors: Somayyeh Hamzei Taj, Debbie Le Blon, Chloé Hoornaert, Jasmijn Daans, Alessandra Quarta, Jelle Praet, Annemie Van der Linden, Peter Ponsaerts, Mathias Hoehn

Published in: Journal of Neuroinflammation | Issue 1/2018

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Abstract

Background

Subtle adjustment of the activation status of CNS resident microglia and peripheral macrophages, to promote their neuroprotective and neuroregenerative functions, may facilitate research towards curing neurodegenerative disorders. In the present study, we investigated whether targeted intracerebral delivery of the anti-inflammatory cytokine interleukin (IL)13, by means of transplanting IL13-expressing mesenchymal stem cells (IL13-MSCs), can promote a phenotypic switch in both microglia and macrophages during the pro-inflammatory phase in a mouse model of ischemic stroke.

Methods

We used the CX3CR1eGFP/+ CCR2RFP/+ transgenic mouse model to separately recognize brain-resident microglia from infiltrated macrophages. Quantitative immunohistochemical analyses were applied to characterize polarization phenotypes of both cell types.

Results

Distinct behaviors of both cell populations were noted dependent on the anatomical site of the lesion. Immunohistochemistry revealed that mice grafted with IL13-MSCs, in contrast to non-grafted and MSC-grafted control mice, were able to drive recruited microglia and macrophages into an alternative activation state, as visualized by a significant increase of Arg-1 and a noticeable decrease of MHC-II expression at day 14 after ischemic stroke. Interestingly, both Arg-1 and MHC-II were expressed more abundantly in macrophages than in microglia, further confirming the distinct behavior of both cell populations.

Conclusions

The current data highlight the importance of controlled and localized delivery of the anti-inflammatory cytokine IL13 for modulation of both microglia and macrophage responses after ischemic stroke, thereby providing pre-clinical rationale for the application of L13-MSCs in future investigations of neurodegenerative disorders.
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Metadata
Title
Targeted intracerebral delivery of the anti-inflammatory cytokine IL13 promotes alternative activation of both microglia and macrophages after stroke
Authors
Somayyeh Hamzei Taj
Debbie Le Blon
Chloé Hoornaert
Jasmijn Daans
Alessandra Quarta
Jelle Praet
Annemie Van der Linden
Peter Ponsaerts
Mathias Hoehn
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Journal of Neuroinflammation / Issue 1/2018
Electronic ISSN: 1742-2094
DOI
https://doi.org/10.1186/s12974-018-1212-7

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