NDLI: Salidroside attenuates HALI via IL-17A-mediated ferroptosis of alveolar epithelial cells by regulating Act1-TRAF6-p38 MAPK pathway

Content Provider	Springer Nature : BioMed Central
Author	Guo, Baoyue Zuo, Zhongfu Di, Xingwei Huang, Ying Gong, Gu Xu, Bo Wang, Lulu Zhang, Xiaoyu Liang, Zhuang Hou, Yang Liu, Xuezheng Hu, Zhansheng
Abstract	Background and Purpose Hyperoxia-induced acute lung injury (HALI) is a critical life-threatening disorder characterized by severe infiltration immune cells and death of type II alveolar epithelial cells (AECII). However, little is known about the relations between immune cells and AECII in HALI. IL-17A is a pro-inflammatory cytokine mainly secreted by Th17 cells, contributing to the pathogenesis of various inflammatory diseases. The present study investigated the role of IL-17A in cell–cell communication between immune cells and AECII in HALI, and explored the therapeutic effect of salidroside (Sal, a natural anti-inflammatory agents) on HALI. Methods Mice with HALI were induced by exposure to hyperoxia over 90% for 12 h, 24 h, 48 h or 72 h, and the optimal timing was detected by H&E and Masson staining. Ferroptosis was confirmed by detecting the levels of MDA, Fe2+ and GPX4, and the morphological alterations of AECII under transmission electron microscopy. The expression of pro-inflammatory cytokine, including IL-6, TGF-β1, IL-17A and IL-17A receptor (IL-17RA) were measured by Western blotting and immunohistochemical stanning. The ferroptosis-related Act1/TRAF6/p38 MAPK pathway was detected by Western blotting. The role of pro-inflammatory cytokine IL-17A for AECII ferroptosis, and the effect of Sal on HALI were investigated by administration of Y-320 (IL-17 inhibitor) and Sal respectively 3 days before mice exposed to hyperoxia. Results Mice exposed to hyperoxia for 24 h suffered sufficient HALI with inflammatory cell infiltration and collagen deposition, and exhibited features of ferroptosis under TME. Meanwhile, compared with sham mice, mice exposed to hyperoxia showed down-regulation of GPX4, and up-regulation of IL-6, TGF-β1, IL-17A, IL-17RA, Act1, TRAF6, p38 MAPK and p-p38 MAPK. Moreover, inhibition of IL-17A with Y-320 or administration with Sal could reverse the effect caused by hyperoxia respectively. Conclusions IL-17A is associated with immune cells infiltration in HALI, and contributes to ferroptosis of AECII that related to Act1/TRAF6/p38 MAPK pathway. Additionally, Sal protects against HALI throughout the whole pathogenic process. Video Abstract
Related Links	https://biosignaling.biomedcentral.com/counter/pdf/10.1186/s12964-022-00994-1.pdf
Ending Page	13
Page Count	13
Starting Page	1
File Format	HTM / HTML
DOI	10.1186/s12964-022-00994-1
Journal	Cell Communication and Signaling
Issue Number	1
Volume Number	20
Language	English
Publisher	BioMed Central
Publisher Date	2022-11-21
Access Restriction	Open
Subject Keyword	Cell Biology Protein-Ligand Interactions Receptors Cytokines and Growth Factors IL-17A Ferroptosis Salidroside Immune cells HALI
Content Type	Text
Resource Type	Article
Subject	Biochemistry Cell Biology Molecular Biology
Journal Impact Factor	8.2/2023
5-Year Journal Impact Factor	8/2023

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