Lung epithelial cell-derived IL-25 negatively regulates LPS-induced exosome release from macrophages.

Lung epithelial cell-derived IL-25 negatively regulates LPS-induced exosome release from macrophages.
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肺上皮细胞来源的 IL-25 负向调节 LPS 诱导的巨噬细胞外泌体释放

DOI:
10.1186/s40779-018-0173-6
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发表时间:
2018-07-30
影响因子:
21.1
通讯作者:
Fan J
Fan J
中科院分区:
医学1区
文献类型:
--
作者:
Li ZG;Scott MJ;Brzóska T;Sundd P;Li YH;Billiar TR;Wilson MA;Wang P;Fan J

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急性肺损伤(ALI)是肺部和全身感染后多器官功能障碍综合征(MODS)的主要组成部分。肺泡巨噬细胞(AMϕ)是急性肺损伤发病机制的核心。新的证据表明,肺部细胞与细胞之间的相互作用在急性肺部炎症的发展过程中起着重要的调节作用。然而,其中的内在机制仍未得到很好的研究。在本研究中,我们探索了肺上皮细胞(LEPCs)在 LPS 刺激后调节 AMϕ 释放外泌体的新功能。 在体内实验中,C57BL/6野生型(WT)小鼠经气管内气雾剂给药,在0.2毫升生理盐水中加入脂多糖(LPS)(2毫克/千克体重)。在 LPS 处理后 0-24 小时收集支气管肺泡灌洗液,并测量从 AMϕ 中提取的外泌体。在体外研究中,从 WT 或 TLR4-/- 小鼠体内分离出 LEPCs 和骨髓衍生 Mϕ (BMDM),然后在 Transwell™ 系统中进行共培养。在共培养 0-24 小时后,收获 BMDM 和上清液以测定外泌体和细胞因子。 我们证明了 LPS 能诱导巨噬细胞(Mϕ)释放外泌体,然后被邻近的 Mϕ 内化,促进 TNF-α 的表达。LEPCs 分泌的白细胞介素(IL)-25 会下调 Mϕ 中 Rab27a 和 Rab27b 的表达,从而抑制外泌体的释放,进而减少外泌体诱导的 TNF-α 表达和分泌。 这些研究结果揭示了 LEPCs 和 Mϕ 之间以前未被发现的串扰途径,它能负向调节 Mϕ 对 LPS 的炎症反应。调节 IL-25 信号和靶向外泌体释放可能是治疗 ALI 的一种新的治疗策略。
Acute lung injury (ALI) is a major component of multiple organ dysfunction syndrome (MODS) following pulmonary and systemic infection. Alveolar macrophages (AMϕ) are at the center of ALI pathogenesis. Emerging evidence has shown that cell-cell interactions in the lungs play an important regulatory role in the development of acute lung inflammation. However, the underneath mechanisms remain poorly addressed. In this study, we explore a novel function of lung epithelial cells (LEPCs) in regulating the release of exosomes from AMϕ following LPS stimulation. For the in vivo experiments, C57BL/6 wildtype (WT) mice were treated with lipopolysaccharide (LPS) (2 mg/kg B.W.) in 0.2 ml of saline via intratracheal aerosol administration. Bronchoalveolar lavage fluid was collected at 0–24 h after LPS treatment, and exosomes derived from AMϕ were measured. For the in vitro studies, LEPCs and bone marrow-derived Mϕ (BMDM) were isolated from WT or TLR4−/− mice and were then cocultured in the Transwell™ system. After coculture for 0–24 h, the BMDM and supernatant were harvested for the measurement of exosomes and cytokines. We demonstrate that LPS induces macrophages (Mϕ) to release exosomes, which are then internalized by neighboring Mϕ to promote TNF-α expression. The secreted interleukin (IL)-25 from LEPCs downregulates Rab27a and Rab27b expression in Mϕ, resulting in suppressed exosome release and thereby attenuating exosome-induced TNF-α expression and secretion. These findings reveal a previously unidentified crosstalk pathway between LEPCs and Mϕ that negatively regulates the inflammatory responses of Mϕ to LPS. Modulating IL-25 signaling and targeting exosome release may present a new therapeutic strategy for the treatment of ALI.
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