Crystalline silica-induced leukotriene B4-dependent inflammation promotes lung tumour growth.

Crystalline silica-induced leukotriene B4-dependent inflammation promotes lung tumour growth.
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DOI:
10.1038/ncomms8064
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发表时间:
2015-04-29
影响因子:
16.6
通讯作者:
Haribabu B
Haribabu B
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Satpathy SR;Jala VR;Bodduluri SR;Krishnan E;Hegde B;Hoyle GW;Fraig M;Luster AD;Haribabu B

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长期暴露于结晶二氧化硅(CS)会导致矽肺,这是一种不可逆的肺部炎症性疾病,最终可能导致肺癌。在这项研究中,我们证明,在K-rasLA 1小鼠中,CS暴露显着增强肺肿瘤负荷和白三烯B4受体1(BLT 1-/-)的基因缺失减弱这种增加。在BLT 1 −/− K-rasLA 1小鼠中,CS诱导的肺部嗜酸性炎症显著减少。CS暴露诱导肥大细胞和巨噬细胞产生LTB 4,而不依赖于炎性小体活化。在气囊模型中,CS诱导的中性粒细胞募集依赖于肥大细胞产生LTB 4和中性粒细胞表达BLT 1。在可植入的肺肿瘤模型中,CS暴露导致肿瘤快速生长并降低存活率,其在不存在BLT 1的情况下减弱。这些结果表明,LTB 4/BLT 1轴设定了CS诱导的无菌炎症的速度,促进了肺癌的进展。这些知识将促进免疫策略的发展,以对抗矽肺和肺癌。
Chronic exposure to crystalline silica (CS) causes silicosis, an irreversible lung inflammatory disease that may eventually lead to lung cancer. In this study, we demonstrate that in K-rasLA1 mice, CS exposure markedly enhances the lung tumor burden and genetic deletion of leukotriene B4 receptor1 (BLT1−/−) attenuates this increase. Pulmonary neutrophilic inflammation induced by CS is significantly reduced in BLT1−/−K-rasLA1 mice. CS exposure induces LTB4 production by mast cells and macrophages independent of inflammasome activation. In an air pouch model, CS-induced neutrophil recruitment is dependent on LTB4 production by mast cells and BLT1 expression on neutrophils. In an implantable lung tumor model, CS exposure results in rapid tumor growth and decrease survival that is attenuated in the absence of BLT1. These results suggest that LTB4/BLT1 axis sets the pace of CS-induced sterile inflammation that promotes lung cancer progression. This knowledge will facilitate development of immunotherapeutic strategies to fight silicosis and lung cancer.
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