Article (Scientific journals)
Recruitment of hepatic macrophages from monocytes is independent of IL-4Ralpha but is associated with ablation of resident macrophages in schistosomiasis.
Rolot, Marion; Dougall, Annette; Javaux, Justine et al.
2019In European Journal of Immunology
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Keywords :
Mphi; liver; monocytes; mouse model; schistosomiasis
Abstract :
[en] Alternatively-activated Mphis (AAMphi) accumulate in hepatic granulomas during schistosomiasis and have been suggested to originate in the bone marrow. What is less understood is how these Mphi responses are regulated after S. mansoni infection. Here, we investigated the role of IL-4 receptor alpha-chain (IL-4Ralpha)-signalling in the dynamics of liver Mphi responses. We observed that IL-4Ralpha signalling was dispensable for the recruitment of Ly6C(hi) monocytes and for their conversion into F4/80(hi) CD64(hi) CD11b(hi) Mphi. Moreover, while IL-4Ralpha provided an AAMphi phenotype to liver F4/80(hi) CD64(hi) CD11b(hi) Mphi that was associated with regulation of granuloma formation, it was dispensable for host survival. Resident F4/80(hi) CD64(hi) CD11b(lo) Mphi did not upregulate the AAMphi signature gene Ym1. Rather, resident Mphi nearly disappeared by week 8 after infection and artificial ablation of resident Mphi in CD169(DTR) mice did not affect the response to S. mansoni infection. Interestingly, ablation of CD169(+) cells in naive mice resulted in the accumulation of F4/80(hi) CD64(hi) CD11b(hi) Mphi, which was amplified when ablation occurred during schistosomiasis. Altogether, our results suggest the ablation of resident KCs after S. mansoni infection to be associated with the recruitment and accumulation of F4/80(hi) CD64(hi) CD11b(hi) Mphi with lyz2-dependent IL-4Ralpha contributing to the regulation of granuloma inflammation but being dispensable for host survival. This article is protected by copyright. All rights reserved.
Disciplines :
Immunology & infectious disease
Author, co-author :
Rolot, Marion ;  Université de Liège - ULiège > Immunologie et vaccinologie
Dougall, Annette
Javaux, Justine
Lallemand, Francois
Machiels, Bénédicte  ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires (DMI) > Vaccinologie vétérinaire
Martinive, Philippe ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Département des sciences biomédicales et précliniques
Gillet, Laurent  ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires (DMI) > Vaccinologie vétérinaire
Dewals, Benjamin G  ;  Université de Liège - ULiège > Immunologie et vaccinologie
Language :
English
Title :
Recruitment of hepatic macrophages from monocytes is independent of IL-4Ralpha but is associated with ablation of resident macrophages in schistosomiasis.
Publication date :
2019
Journal title :
European Journal of Immunology
ISSN :
0014-2980
eISSN :
1521-4141
Publisher :
John Wiley & Sons, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
This article is protected by copyright. All rights reserved.
Available on ORBi :
since 24 April 2019

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