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KMID : 0988920180160030384
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Intestinal Research
2018 Volume.16 No. 3 p.384 ~ p.392
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β-(1,3)-Glucan derived from Candida albicans induces inflammatory cytokines from macrophages and lamina propria mononuclear cells derived from patients with Crohn’s disease
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Mori Kiyoto
Naganuma Makoto
Mizuno Shinta
Suzuki Hiroaki
Kitazume Mina T.
Shimamura Katsuyoshi
Chiba Sayako
Sugita Akira
Matsuoka Katsuyoshi
Hisamatsu Tadakazu
Kanai Takanori
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Abstract
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Background/Aims: Recent research has highlighted the importance of interactions between commensal fungi and intestinal inflammation. However, there are few studies investigating whether commensal fungi contribute to inflammation in patients with Crohn’s disease (CD). The aim of this study is to investigate reveal interactions between commensal fungi and host immune cells in CD.
Methods: CD14-positive monocytes were isolated from peripheral blood mononuclear cells from healthy human volunteers and then differentiated in the presence of macrophage colony-stimulating factor (M-CSF) (referred to as M-macrophages, M-Mφs) or M-CSF and interferon-γ (IFN-γ) (referred to as M-gamma macrophages, Mγ-Mφs). Cytokine production by these in vitro differentiated macrophages in response to β-(1,3)-glucan was analyzed by flow cytometry. Expression of Dectin-1 was examined using flow cytometry, western blotting, and quantitative reverse transcription-polymerase chain reaction. Cytokine production by in vitro differentiated macrophages in response to β-(1,3)-glucan was measured in the presence of an anti-Dectin-1 receptor antagonist, anti-Syr, or an anti-Fas-1 antibody. Cytokine production by lamina propria mononuclear cells (LPMCs) derived from CD patients in response to β-(1,3)-glucan was also analyzed.
Results: Mγ-Mφs produced a large amount of tumor necrosis factor-α (TNF-α) and interleukin-6 in response to β-(1,3)-glucan. Dectin-1 expression was significantly higher in Mγ-Mφs than in M-Mφs. The increase in TNF-α production by Mγ-Mφs stimulated with glucan was reversed by blocking Dectin-1, Syr or Fas-1. LPMCs derived from CD patients stimulated with β-(1,3)-glucan produced significantly higher amount of TNF-α than LPMCs derived from UC patients.
Conclusions: These results suggest that commensal fungal microbiota may contribute to the pathogenesis of CD by inducing macrophages-derived pro-inflammatory cytokines.
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KEYWORD
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Crohn disease, Candida albicans, Tumor necrosis factor-alpha, Dectin-1
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