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Title: Mesenchymal stem cells attenuate liver fibrosis by suppressing Th17 cells – an experimental study
Authors: Milosavljevic N.
Gazdic, Marina
Simovic Markovic, Bojana
Arsenijevic A.
Nurkovic J.https
Dolicanin Z.
Jovicic, Nemanja
Jeftic, Ilija
Djonov V.
Arsenijevic, Nebojsa
Lukic, Miodrag
Volarevic, Vladislav
Issue Date: 2018
Abstract: © 2017 Steunstichting ESOT This study investigates molecular and cellular mechanisms involved in mesenchymal stem cell (MSC)-mediated modulation of IL-17 signaling during liver fibrosis. Mice received CCl4 (1 μl/g intraperitoneally) twice/week for 1 month. MSCs (1 × 106), or MSC-conditioned medium (MSC-CM), were intravenously injected 24 h after CCl4 and on every 7th day. Liver fibrosis was determined by macroscopic examination, histological analysis, Sirius red staining, and RT-PCR. Serum levels of cytokines, indoleamine 2,3-dioxygenase (IDO), and kynurenine were determined by ELISA. Flow cytometry was performed to identify liver-infiltrated cells. In vitro, CD4+ T cells were stimulated and cultured with MSCs. 1-methyltryptophan was used for inhibition of IDO. MSCs significantly attenuated CCl4-induced liver fibrosis by decreasing serum levels of inflammatory IL-17, increasing immunosuppressive IL-10, IDO, and kynurenine, reducing number of IL-17 producing Th17 cells, and increasing percentage of CD4+IL-10+ T cells. Injection of MSC-CM resulted with attenuated fibrosis accompanied with the reduced number of Th17 cells in the liver and decreased serum levels of IL-17. MSC-CM promoted expansion of CD4+FoxP3+IL-10+ T regulatory cells and suppressed proliferation of Th17 cells. This phenomenon was completely abrogated in the presence of IDO inhibitor. MSCs, in IDO-dependent manner, suppress liver Th17 cells which lead to the attenuation of liver fibrosis.
Type: article
DOI: 10.1111/tri.13023
ISSN: 0934-0874
SCOPUS: 2-s2.0-85039041588
Appears in Collections:Faculty of Medical Sciences, Kragujevac

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