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Bone marrow-derived innate macrophages attenuate oxazolone-induced colitis. | LitMetric

Bone marrow-derived innate macrophages attenuate oxazolone-induced colitis.

Cell Immunol

Department of Hematology, Institute of Molecular Hematology, The Second Xiang-ya Hospital, Central South University, Changsha, Hunan, PR China. Electronic address:

Published: January 2017

AI Article Synopsis

Article Abstract

Previous studies have shown that a subpopulation of granulocyte macrophage colony-stimulating factor (GM-CSF)-dependent F4/80 CD11b innate macrophages could be derived from bone marrow cells by continuous in vitro culturing. These cells could be induced to differentiate into M1 or M2 macrophages in vitro. In the current study, we sought to determine whether bone marrow cell-derived innate macrophages (BMIMs) could be used to fulfill an anti-inflammatory purpose by intravenous transplantation in vivo after being stimulated to differentiate into M2 macrophages. Because Th2 cytokines, such as interleukin IL-4 and IL-13, can induce macrophage polarization into M2 macrophages, we treated the BMIMs with IL-4 and IL-13 in vitro. Next, the M2 macrophages were intravenously transplanted into a typical Th2-mediated inflammatory disease model, oxazolone (OXZ)-induced colitis, to assess the anti-inflammatory activity of BMIM-derived M2 macrophages (BMIM-M2Ms) in vivo. After transplantation, the severity of intestinal inflammation was attenuated. In addition, colon lengths and mouse body weights were noticeably improved. F4/80 CD206 double-positive cells (displaying the markers of M2 macrophages) had accumulated in the colon tissue of BMIM-M2M-transplanted mice. This evidence demonstrated that bone marrow-derived BMIM-M2Ms could be used to alleviate OXZ-induced Th2-mediated inflammation in a mouse model in vivo.

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http://dx.doi.org/10.1016/j.cellimm.2016.10.003DOI Listing

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