Extracellular ATP mediates mast cell-dependent intestinal inflammation through P2X7 purinoceptors.

Extracellular ATP mediates mast cell-dependent intestinal inflammation through P2X7 purinoceptors.
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DOI:
10.1038/ncomms2023
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发表时间:
2012
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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肥大细胞是已知的过敏性和炎症性疾病的效应细胞,但它们在肠道炎症中的确切作用仍然未知。在这里,我们表明,在肠道炎症肥大细胞的激活是由ATP反应性P2 X7嘌呤受体介导的。我们发现在结肠炎小鼠和克罗恩病患者的结肠中表达P2 X7嘌呤受体的肥大细胞数量增加。用P2 X7嘌呤受体特异性抗体治疗小鼠可抑制肥大细胞活化和随后的肠道炎症。类似地,在肥大细胞缺陷型KitW-sh/W-sh小鼠中肠道炎症得到改善,并且用野生型而不是P2 x7 −/−肥大细胞重建导致对炎症的易感性。ATP-P2 X7嘌呤受体介导的肥大细胞活化不仅诱导炎性细胞因子,而且诱导趋化因子和白三烯,以募集中性粒细胞并随后加剧肠道炎症。这些发现揭示了P2 X7嘌呤受体介导的肥大细胞活化在肠道炎症的起始和加重中的作用。肥大细胞是I型过敏性疾病和炎症的介质。Kurashima等人发现,在患有结肠炎的小鼠结肠中肥大细胞增加,并且可以通过抑制嘌呤受体P2 X7来阻断细胞的活化和随后的炎症。
Mast cells are known effector cells in allergic and inflammatory diseases, but their precise roles in intestinal inflammation remain unknown. Here we show that activation of mast cells in intestinal inflammation is mediated by ATP-reactive P2X7 purinoceptors. We find an increase in the numbers of mast cells expressing P2X7 purinoceptors in the colons of mice with colitis and of patients with Crohn's disease. Treatment of mice with a P2X7 purinoceptor-specific antibody inhibits mast cell activation and subsequent intestinal inflammation. Similarly, intestinal inflammation is ameliorated in mast cell-deficient KitW-sh/W-sh mice, and reconstitution with wild-type, but not P2x7−/− mast cells results in susceptibility to inflammation. ATP-P2X7 purinoceptor-mediated activation of mast cells not only induces inflammatory cytokines, but also chemokines and leukotrienes, to recruit neutrophils and subsequently exacerbate intestinal inflammation. These findings reveal the role of P2X7 purinoceptor-mediated mast cell activation in both the initiation and exacerbation of intestinal inflammation. Mast cells are mediators of type I allergic disease and inflammation. Here, Kurashima et al. show that mast cells are increased in the colons of mice with colitis, and that activation of the cells and subsequent inflammation can be blocked by inhibition of the purinoceptor, P2X7.
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