白细胞介素-1β诱导促炎成纤维细胞微环境,损害肺祖细胞功能。
IL-1β Induces a Proinflammatory Fibroblast Microenvironment that Impairs Lung Progenitors' Function.
作者信息
Ciminieri Chiara, Woest Manon E, Reynaert Niki L, Heijink Irene H, Wardenaar René, Spierings Diana C J, Brandsma Corry-Anke, Königshoff Melanie, Gosens Reinoud
机构信息
Department of Molecular Pharmacology, Faculty of Science and Engineering, University of Groningen, Groningen, The Netherlands.
Groningen Research Institute for Asthma and COPD.
出版信息
Am J Respir Cell Mol Biol. 2023 Apr;68(4):444-455. doi: 10.1165/rcmb.2022-0209OC.
Chronic obstructive pulmonary disease (COPD) is characterized by a persistent inflammatory state in the lungs and defective tissue repair. Although the inflammatory response in patients with COPD is well characterized and known to be exaggerated during exacerbations, its contribution to lung injury and abnormal repair is still unclear. In this study, we aimed to investigate how the inflammatory microenvironment affects the epithelial progenitors and their supporting mesenchymal niche cells involved in tissue repair of the distal lung. We focused on IL-1β, a key inflammatory mediator that is increased during exacerbations of COPD, and used an organoid model of lung epithelial cells and fibroblasts to assess the effect of IL-1β treatment on these cells' transcriptome and secreted factors. Whereas direct treatment of the lung organoids with IL-1β promoted organoid growth, this switched toward inhibition when it was added as fibroblast pretreatment followed by organoid treatment. We then investigated the IL-1β-driven mechanisms in the fibroblasts and found an inflammatory response related to (C-X-C motif) ligand (CXCL) chemokines; we confirmed that these chemokines were responsible for the impaired organoid growth and found that targeting their C-X-C chemokine receptors 1/2 (CXCR1/2) receptors or the IL-1β intracellular signaling reduced the proinflammatory response and restored organoid growth. These data demonstrate that IL-1β alters the fibroblasts' state by promoting a distinct inflammatory response, switching their supportive function on epithelial progenitors toward an inhibitory one in an organoid assay. These results imply that chronic inflammation functions as a shift toward inhibition of repair, thereby contributing to chronic inflammatory diseases like COPD.
慢性阻塞性肺疾病(COPD)的特征是肺部持续存在炎症状态以及组织修复缺陷。尽管COPD患者的炎症反应已得到充分表征,并且已知在病情加重期间会加剧,但炎症对肺损伤和异常修复的作用仍不清楚。在本研究中,我们旨在探究炎症微环境如何影响参与远端肺组织修复的上皮祖细胞及其支持性间充质微环境细胞。我们聚焦于白细胞介素-1β(IL-1β),这是一种在COPD病情加重期间会增加的关键炎症介质,并使用肺上皮细胞和成纤维细胞的类器官模型来评估IL-1β处理对这些细胞转录组和分泌因子的影响。虽然用IL-1β直接处理肺类器官可促进类器官生长,但当成纤维细胞预处理后再进行类器官处理时,这种促进作用就会转变为抑制作用。然后,我们研究了成纤维细胞中IL-1β驱动的机制,发现了一种与(C-X-C基序)配体(CXCL)趋化因子相关的炎症反应;我们证实这些趋化因子是类器官生长受损的原因,并发现靶向它们的C-X-C趋化因子受体1/2(CXCR1/2)或IL-1β细胞内信号传导可降低促炎反应并恢复类器官生长。这些数据表明,IL-1β通过促进一种独特的炎症反应来改变成纤维细胞的状态,在类器官试验中将它们对上皮祖细胞的支持功能转变为抑制功能。这些结果意味着慢性炎症起到了抑制修复的作用,从而导致了像COPD这样的慢性炎症性疾病。
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