Activation of TRAF1 induced by USP7/SP1 exacerbates the severity of infantile pneumonia.

IF 2.7 3区 生物学
Ying Liu, Yilun Ji, Yu Zhang, Zhengsi Li
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引用次数: 0

Abstract

Background: Infantile pneumonia (IP) is a leading cause of morbidity and mortality in children worldwide, with limited treatment options. Tumor necrosis factor receptor-associated factor 1 (TRAF1) has been implicated in the pathogenesis of various inflammatory diseases. Given the lack of effective therapies in IP, understanding the role of TRAF1 in regulating IP is crucial for developing new therapeutic strategies.

Methods: This study utilized in vitro and in vivo models to investigate the role of TRAF1 in IP. WI-38 cells were stimulated with lipopolysaccharide (LPS), and rats were administered LPS to mimic IP. The mRNA expression of TRAF1 and Sp1 transcription factor (SP1) was analyzed using quantitative real-time polymerase chain reaction. The protein expression of TRAF1, ubiquitin-specific peptidase 7 (USP7), and SP1 was detected by western blotting. Cell viability and apoptosis were assessed using cell counting kit-8 assay and flow cytometry/TUNEL assays, respectively. Interleukin-6 and tumor necrosis factor-α levels were measured by enzyme-linked immunosorbent assays. Reactive oxygen species and malondialdehyde levels were analyzed using fluorescence microscopy and colorimetric assays. The interactions among USP7, TRAF1, and SP1 were identified using co-immunoprecipitation assay, immunofluorescence assay, and dual-luciferase reporter assay. TRAF1 silencing-induced effects were validated in a rat model. Lung tissue pathology was assessed using haematoxylin and eosin assay and Massion assay.

Results: LPS treatment induced apoptosis, inflammation, and oxidative stress of WI-38 cells, however, TRAF1 silencing ameliorated these effects. USP7 stabilized TRAF1 protein expression through its deubiquitinating activity, while TRAF1 overexpression reversed the effects of USP7 silencing in LPS-treated WI-38 cells. In addition, SP1 transcriptionally activated TRAF1 in WI-38 cells. Further, TRAF1 silencing improved lung injury in LPS-induced mice.

Conclusion: Activation of TRAF1 by USP7/SP1 exacerbated the severity of IP, suggesting that targeting TRAF1 may have significant clinical implications for the treatment of IP.

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来源期刊
Hereditas
Hereditas Biochemistry, Genetics and Molecular Biology-Genetics
CiteScore
3.80
自引率
3.70%
发文量
0
期刊介绍: For almost a century, Hereditas has published original cutting-edge research and reviews. As the Official journal of the Mendelian Society of Lund, the journal welcomes research from across all areas of genetics and genomics. Topics of interest include human and medical genetics, animal and plant genetics, microbial genetics, agriculture and bioinformatics.
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