IL-33/ST2 signalling and crosstalk with FcεRI and TLR4 is targeted by the parasitic worm product, ES-62.

IL-33/ST2 signalling and crosstalk with FcεRI and TLR4 is targeted by the parasitic worm product, ES-62.
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DOI:
10.1038/s41598-018-22716-9
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发表时间:
2018-03-14
期刊:
影响因子:
4.6
通讯作者:
Harnett MM
Harnett MM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ball DH;Al-Riyami L;Harnett W;Harnett MM

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ES-62 是一种分泌型寄生虫源性免疫调节剂,通过下调异常 MyD88 信号传导使炎症表型和肥大细胞反应正常化,在过敏方面具有治疗潜力。 IL-33 通过 IL-33 受体 (ST2)、TLR4 和 FcεRI 之间的 MyD88 整合串扰,在驱动肥大细胞反应和促进 2 型过敏性炎症(尤其是哮喘)方面发挥重要作用。我们现在已经研究了 ES-62 是否通过破坏 ST2 信号传导来靶向该致病网络,特别是通过表征野生型和 ST2 缺陷肥大细胞中的蠕虫产物如何调节 ST2、TLR4 和 FcεRI 之间串扰的功能结果。该分析表明,虽然 ES-62 抑制 IL-33/ST2 信号传导,但观察到的精确功能调节随受体使用和/或肥大细胞表型而变化。因此,虽然 ES-62 利用 ST2 隔离 MyD88 的能力似乎足以介导其在腹膜来源的浆膜肥大细胞中的抑制作用,但似乎需要下调 MyD88 表达来抑制通常由骨髓来源的粘膜肥大细胞释放的较高水平的细胞因子产生。
ES-62 is a secreted parasitic worm-derived immunomodulator that exhibits therapeutic potential in allergy by downregulating aberrant MyD88 signalling to normalise the inflammatory phenotype and mast cell responses. IL-33 plays an important role in driving mast cell responses and promoting type-2 allergic inflammation, particularly with respect to asthma, via MyD88-integrated crosstalk amongst the IL-33 receptor (ST2), TLR4 and FcεRI. We have now investigated whether ES-62 targets this pathogenic network by subverting ST2-signalling, specifically by characterising how the functional outcomes of crosstalk amongst ST2, TLR4 and FcεRI are modulated by the worm product in wild type and ST2-deficient mast cells. This analysis showed that whilst ES-62 inhibits IL-33/ST2 signalling, the precise functional modulation observed varies with receptor usage and/or mast cell phenotype. Thus, whilst ES-62’s harnessing of the capacity of ST2 to sequester MyD88 appears sufficient to mediate its inhibitory effects in peritoneal-derived serosal mast cells, downregulation of MyD88 expression appears to be required to dampen the higher levels of cytokine production typically released by bone marrow-derived mucosal mast cells.
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