Silica crystals and aluminum salts activate the NALP3 inflammasome through phagosomal destabilization.

Silica crystals and aluminum salts activate the NALP3 inflammasome through phagosomal destabilization.
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DOI:
10.1038/ni.1631
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发表时间:
2008-08
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
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--
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吸入二氧化硅晶体会引起肺泡腔炎症。长期接触二氧化硅可导致矽肺的发展,这是一种不可逆的纤维化肺病。二氧化硅和其他晶体激活免疫细胞的机制尚不清楚。在这里,我们证明了二氧化硅和铝盐晶体激活NALP3炎性体。NALP3活化需要晶体吞噬作用,晶体摄取导致溶酶体损伤和破裂。无菌溶酶体损伤也足以诱导NALP 3活化,并且吞噬体酸化或组织蛋白酶B的抑制损害NALP 3活化。这些结果表明,NALP3炎性体可以感知由各种手段诱导的溶酶体损伤作为内源性危险信号。
Inhalation of silica crystals causes inflammation in the alveolar space. Prolonged silica exposure can lead to the development of silicosis, an irreversible, fibrotic pulmonary disease. The mechanisms by which silica and other crystals activate immune cells are not well understood. Here, we demonstrate that silica and aluminum salt crystals activate the NALP3 inflammasome. NALP3 activation requires crystal phagocytosis and crystal uptake leads to lysosomal damage and rupture. Sterile lysosomal damage is also sufficient to induce NALP3 activation and inhibition of phagosomal acidification or cathepsin B impairs NALP3 activation. These results indicate that the NALP3 inflammasome can sense lysosomal damage induced by various means as an endogenous danger signal.
DOI: 10.1126/science.1150110
发表时间: 2008-02-01
期刊: SCIENCE
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