Carbon monoxide ameliorates chronic murine colitis through a heme oxygenase 1-dependent pathway.

Carbon monoxide ameliorates chronic murine colitis through a heme oxygenase 1-dependent pathway.
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DOI:
10.1084/jem.20051047
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发表时间:
2005-12-19
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Plevy SE
Plevy SE
中科院分区:
其他
文献类型:
--
作者:
Hegazi RA;Rao KN;Mayle A;Sepulveda AR;Otterbein LE;Plevy SE

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血红素氧合酶(HO)-1及其代谢产物一氧化碳(CO)在急性炎症状态中起调节作用。在这项研究中,我们证明了一氧化碳管理是有效的,作为一种治疗模式,在小鼠建立慢性结肠炎。一氧化碳给药可改善T辅助细胞(Th)1介导的小鼠结肠炎模型,白细胞介素(IL)-10-缺陷(IL-10 −/−)小鼠的慢性肠道炎症。在Th 1介导的炎症中,CO消除干扰素(IFN)-γ对小鼠巨噬细胞中脂多糖诱导的IL-12 p40的协同作用,并通过抑制转录因子IFN调节因子(IRF)家族成员IRF-8改变IFN-γ信号传导。一个特定的信号通路,以前没有确定,涉及一个强制性的作用HO-1诱导提供的保护CO。此外,CO拮抗IFN-γ对HO-1表达的抑制作用在巨噬细胞。在巨噬细胞和Th 1介导的结肠炎中,HO-1的药理学诱导再现了CO的免疫抑制作用。总之,本研究开始阐明CO和HO-1通路在慢性炎症性肠病中的潜在病因学和治疗意义。
Heme oxygenase (HO)-1 and its metabolic product carbon monoxide (CO) play regulatory roles in acute inflammatory states. In this study, we demonstrate that CO administration is effective as a therapeutic modality in mice with established chronic colitis. CO administration ameliorates chronic intestinal inflammation in a T helper (Th)1-mediated model of murine colitis, interleukin (IL)-10–deficient (IL-10 −/−) mice. In Th1-mediated inflammation, CO abrogates the synergistic effect of interferon (IFN)-γ on lipopolysaccharide-induced IL-12 p40 in murine macrophages and alters IFN-γ signaling by inhibiting a member of the IFN regulatory factor (IRF) family of transcription factors, IRF-8. A specific signaling pathway, not previously identified, is delineated that involves an obligatory role for HO-1 induction in the protection afforded by CO. Moreover, CO antagonizes the inhibitory effect of IFN-γ on HO-1 expression in macrophages. In macrophages and in Th1-mediated colitis, pharmacologic induction of HO-1 recapitulates the immunosuppressive effects of CO. In conclusion, this study begins to elucidate potential etiologic and therapeutic implications of CO and the HO-1 pathway in chronic inflammatory bowel diseases.
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