endogenous il-33 deficiency exacerbates liver injury and increases hepatic influx of neutrophils in acute murine viral hepatitis
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2017
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Abstract
The alarmin IL-33 has been described to be upregulated in human and murine viral hepatitis. However, the role of endogenous IL-33 in viral hepatitis remains obscure. We aimed to decipher its function by infecting IL-33-deficient mice (IL-33 KO) and their wild-type (WT) littermates with pathogenic mouse hepatitis virus (L2-MHV3). The IL-33 KO mice were more sensitive to L2-MHV3 infection exhibiting higher levels of AST/ALT, higher tissue damage, significant weight loss, and earlier death. An increased depletion of B and T lymphocytes, NKT cells, dendritic cells, and macrophages was observed 48 h postinfection (PI) in IL-33 KO mice than that in WT mice. In contrast, a massive influx of neutrophils was observed in IL-33 KO mice at 48 h PI. A transcriptomic study of inflammatory and cell-signaling genes revealed the overexpression of IL-6, TNFα, and several chemokines involved in recruitment/activation of neutrophils (CXCL2, CXCL5, CCL2, and CCL6) at 72 h PI in IL-33 KO mice. However, the IFNγ was strongly induced in WT mice with less profound expression in IL-33 KO mice demonstrating that endogenous IL-33 regulated IFNγ expression during L2-MHV3 hepatitis. In conclusion, we demonstrated that endogenous IL-33 had multifaceted immunoregulatory effect during viral hepatitis via induction of IFNγ, survival effect on immune cells, and infiltration of neutrophils in the liver.
| Reference Key |
carrire2017mediatorsendogenous
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| Authors | ;Virginie Carrière;Muhammad Imran Arshad;Jacques Le Seyec;Benjamin Lefevre;Muhammad Farooq;Aurélien Jan;Christelle Manuel;Laurence Touami-Bernard;Catherine Lucas-Clerc;Valentine Genet;Hugues Gascan;Jean-Philippe Girard;Frédéric Chalmel;Lucie Lamontagne;Claire Piquet-Pellorce;Michel Samson |
| Journal | polyhedron |
| Year | 2017 |
| DOI |
10.1155/2017/1359064
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| URL | |
| Keywords |
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