Niacin suppresses pro‐inflammatory cytokine expression in macrophages in DSS‐induced colitis in mice Niacin suppresses pro‐inflammatory cytokine expression.

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Niacin suppresses pro‐inflammatory cytokine expression in macrophages in DSS‐induced colitis in mice Niacin suppresses pro‐inflammatory cytokine expression in macrophages in DSS‐induced colitis in mice Representative immunofluorescent staining (left) and quantitation (right) of CD301+CD68+ cells in colonic tissues from DSS‐challenged DP1F/F/LysMCre and DP1F/F mice. The arrows indicate the CD301+CD68+ cells (left panel). Scale bar: 100 μm. n = 4.Flow cytometry analysis of CD206+F4/80+ cells in colons DSS‐challenged DP1F/F/LysMCre and DP1F/F mice. n = 5.Flow cytometry analysis of CD11b+F4/80+ cells in colons from DSS‐challenged mice.Real‐time PCR analysis of TNF‐α, MCP‐1, IL‐4, IL‐5, and IL‐10 expression in colonic F4/80+CD11b+ cells in DP1F/F/LysMCre mice and DP1F/F mice. n = 6.Effect of niacin on colonic macrophage infiltration in DSS‐challenged DP1−/− and WT mice. The arrows indicate the CD301+CD68+ cells. Scale bar: 100 μm. WT‐vehicle, DP1−/−‐vehicle, DP1−/−‐niacin: n = 4; WT‐niacin, n = 7.Effect of niacin on MCP‐1, IL‐5, and IL‐10 expression in colonic F4/80+CD11b+ cells in DP1−/− mice and WT mice. n = 6.Schematic illustration of the protective mechanisms of PGD2/DP1 axis in UC. Niacin stimulates PGD2 release in the inflamed colon tissues, which inhibits vascular permeability, suppresses DSS‐induced apoptosis, and downregulates pro‐inflammatory cytokine secretion in macrophages through activation of DP1 receptor. IECs, intestinal epithelial cells; SMCs, smooth muscle cells; MΦ: macrophage.Data information: All data are expressed as mean ± SEM. P‐values were calculated using unpaired Student's t‐test. Data are representative of at least two independent experiments. (A, B) **P < 0.01 vs. DP1F/F. (D) *P < 0.05 vs. DP1F/F. (E) ##P < 0.01 vs. vehicle, **P < 0.01 as indicated. (F) #P < 0.05 vs. vehicle, *P < 0.05, **P < 0.01 as indicated. Juanjuan Li et al. EMBO Mol Med. 2017;emmm.201606987 © as stated in the article, figure or figure legend