ReferenceID 4511
Icaritin inhibited cigarette smoke extract-induced CD8+ T cell chemotaxis enhancement by targeting the CXCL10/CXCR3 axis and TGF-β/Smad2 signaling
Phytomedicine
BACKGROUND: Chronic obstructive pulmonary disease (COPD) is a disabling/fatal disease characterized by progressive pulmonary function decline, and there are currently few drugs that can effectively reverse the decline in
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- Reference Id
- 4511
- Evidence Id
- 21101
- Core Evidence Id
- 21101
- Source Reference Id
- 2299
- Herb2 Reference Id
- HBREF003096
- Subject Paper Key
- HBIN016163_35026517
- Pubmed Id
- 35026517
- Doi
- 10.1016/j.phymed.2021.153907
- Paper Title
- Icaritin inhibited cigarette smoke extract-induced CD8+ T cell chemotaxis enhancement by targeting the CXCL10/CXCR3 axis and TGF-β/Smad2 signaling
- Paper Abstract
- BACKGROUND: Chronic obstructive pulmonary disease (COPD) is a disabling/fatal disease characterized by progressive pulmonary function decline, and there are currently few drugs that can effectively reverse the decline in lung function; therefore, it is necessary to find novel drug targets. CD8+ T cells might be a new therapeutic target for alleviating lung tissue destruction and improving pulmonary function in COPD. The CXCL10/CXCR3 axis is a pivotal chemotactic axis involved in the abnormal infiltration of CD8+ T cells into the lung tissue of COPD; thus, inhibition of this axis might be a potential method to suppress CD8+ T cell-mediated lung tissue destruction in COPD. However, few drugs have been reported to target CD8+ T cells and the CXCL10/CXCR3 axis. Icaritin (ICT), one of the major components of Epimedii Folium, has been reported to have antioxidative effects in a COPD model in vitro. Whether ICT also has effects on CD8+ T cells and the CXCL10/CXCR3 axis in COPD has never been investigated. PURPOSE: This study aimed to investigate the effects of ICT on CD8+ T cell chemotaxis and the CXCL10/CXCR3 axis in interferon (IFN)-gamma + cigarette smoke extract (CSE)-stimulated THP-1-derived macrophages, which simulated the pulmonary microenvironment of COPD, and then to determine the mechanisms. METHODS: The effects of ICT on the expression and secretion of CXCL9, CXCL10, and CXCL11 in THP-1-derived macrophages were measured by qRT-PCR and ELISA, and the effects of the supernatant of THP-1-derived macrophages treated with or without ICT on CD8+ T cell chemotaxis were also evaluated. Subsequently, the effects of ICT on the apoptosis and proliferation of CD8+ T cells were also assessed by EdU-488 assays and Annexin V/PI staining, respectively. Moreover, the mechanisms by which ICT inhibits the CXCL10/CXCR3 axis were investigated by RNA sequencing (RNA-seq) and KEGG pathway enrichment analysis. RESULTS: The present study showed that ICT (5 muM) significantly suppressed the expression and secretion of CXCL9, CXCL10, and CXCL11 in THP-1-derived macrophages after stimulation with IFN-gamma + CSE and indirectly inhibited CD8+ T cell chemotaxis by reducing the secretion of the above chemokines. In addition, this study found that ICT had no significant effect on the proliferation of CD8+ T cells, and neither led to apoptosis. The results of the RNA-seq analysis illustrated that the transforming growth factor (TGF)-beta signaling pathway was significantly downregulated after ICT intervention, and subsequent qRT-PCR and western blotting showed that ICT could significantly downregulate the TGF-beta-Smad2 signaling pathway. CONCLUSIONS: ICT reduced CD8+ T cell chemotaxis by inhibiting the CXCL10/CXCR3 axis, and these effects might be achieved by suppressing the TGF-beta-Smad2 signaling pathway.
- Journal
- Phytomedicine
- Publish Year
- 2022
- Experiment Subject
- Experiment Type
- Cell Experiment
- Phenotype Related
- Pulmonary Function Decline; Lung Tissue Destruction; Chronic Obstructive Pulmonary Disease
- Paper Title Cn
- Paper Title En
- Icaritin inhibited cigarette smoke extract-induced CD8+ T cell chemotaxis enhancement by targeting the CXCL10/CXCR3 axis and TGF-β/Smad2 signaling
- Bilingual Status
- semi_complete