Soluble Epoxide Hydrolase Inhibitor Suppresses the Expression of Triggering Receptor Expressed on Myeloid Cells-1 by Inhibiting NF-kB Activation in Murine Macrophage.

Soluble Epoxide Hydrolase Inhibitor Suppresses the Expression of Triggering Receptor Expressed on Myeloid Cells-1 by Inhibiting NF-kB Activation in Murine Macrophage.
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可溶性环氧化物水解酶抑制剂通过抑制小鼠巨噬细胞中 NF-kB 的激活来抑制骨髓细胞 1 上表达的触发受体的表达

DOI:
10.1007/s10753-016-0448-6
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发表时间:
2017-03
期刊:
影响因子:
5.1
通讯作者:
Guan CX
Guan CX
中科院分区:
医学2区
文献类型:
--
作者:
Dong L;Zhou Y;Zhu ZQ;Liu T;Duan JX;Zhang J;Li P;Hammcok BD;Guan CX

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髓样细胞表达的触发受体1(TREM - 1)是一种在髓样细胞上表达的超免疫球蛋白受体。TREM - 1会增强炎症反应。环氧二十碳三烯酸(EETs)是花生四烯酸经细胞色素P450酶代谢产生的产物,具有抗炎特性。然而,在炎症刺激下EETs对TREM - 1表达的影响仍不清楚。因此,使用一种高选择性抑制剂[1 - 三氟甲氧基苯基 - 3 -(1 - 丙酰基哌啶 - 4 - 基)脲,TPPU]抑制可溶性环氧化物水解酶(sEH)来稳定EETs。在TPPU处理3小时后,将脂多糖(LPS)气管内注射到小鼠体内以诱导肺部炎症。组织学检查显示TPPU治疗减轻了LPS诱导的肺部炎症。TPPU降低了TREM - 1的表达,但不降低DAP12或MyD88的表达。在体外,用LPS刺激小鼠腹腔巨噬细胞。我们发现TPPU以剂量依赖的方式降低LPS诱导的TREM - 1表达,但不降低DAP12或MyD88的表达。TPPU还降低了TREM - 1的下游信号,减少了促炎细胞因子肿瘤坏死因子 - α(TNF - α)和白细胞介素 - 1β(IL - 1β)的mRNA表达。此外,TPPU治疗在体内和体外均抑制IκB的降解。我们的结果表明,抑制sEH可通过抑制小鼠巨噬细胞中核因子 - κB(NF - κB)的激活来抑制LPS诱导的TREM - 1表达和炎症。
Triggering receptors expressed on myeloid cell-1 (TREM-1) is a superimmunoglobulin receptor expressed on myeloid cells. TREM-1 amplifies the inflammatory response. Epoxyeicosatrienoic acids (EETs), the metabolites of arachidonic acid derived from the cytochrome P450 enzyme, have anti-inflammatory properties. However, the effects of EETs on TREM-1 expression under inflammatory stimulation remain unclear. Therefore, inhibition of soluble epoxide hydrolase (sEH) with a highly selective inhibitor [1-trifluoromethoxyphenyl-3-(1-propionylpiperidin-4-yl) urea, TPPU] was used to stabilize EETs. LPS was intratracheally injected into mice to induce pulmonary inflammation, after TPPU treatment for 3 h. Histological examination showed TPPU treatment-alleviated LPS-induced pulmonary inflammation. TPPU decreased TREM-1 expression, but not DAP12 or MyD88 expression. Murine peritoneal macrophages were challenged with LPS in vitro. We found that TPPU reduced LPS-induced TREM-1 expression in a dose-dependent manner, but not DAP12 or MyD88 expression. TPPU also decreased downstream signal from TREM-1, reducing pro-inflammatory cytokineTNF-αandIL-1βmRNA expression. Furthermore, TPPU treatment inhibited IkB degradationin vivoandin vitro. Our results indicate that the inhibition of sEH suppresses LPS-induced TREM-1 expression and inflammationviainhibiting NF-kB activation in murine macrophage.
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