Lin Chen , Hui Chen , Hui Zhang , Guang Zhou , Xuejiao Sun
{"title":"Smoking activates EMT in COPD bronchial epithelial cells through PIK3CA overexpression","authors":"Lin Chen , Hui Chen , Hui Zhang , Guang Zhou , Xuejiao Sun","doi":"10.1016/j.genrep.2024.101994","DOIUrl":null,"url":null,"abstract":"<div><h3>Background</h3><p>Airway remodeling caused by smoking is an important pathological change in chronic obstructive pulmonary disease (COPD), and epithelial-mesenchymal transition (EMT) is one of the core mechanisms involved in airway remodeling. However, the exact molecules and pathway mechanisms involved in the induction of EMT in COPD remain largely unknown. Numerous previous studies have elucidated that overexpression of PIK3CA promotes the proliferation and metastasis in various types of tumors by inducing EMT, while inhibition of PIK3CA can inhibit the invasion and proliferation of tumors. However, the relationship between PIK3CA and EMT has not been reported in COPD.</p></div><div><h3>Methods</h3><p>Fresh pulmonary specimens were collected away from the tumor site from the smoker with COPD (<em>n</em> = 9) and non-smokers without COPD control group (n = 9) who underwent lung tissue resection, and conducted deep sequencing of lung tissue mRNA. It was found that the PIK3CA and EMT pathways play a significant role in the development of COPD using bioinformatics. Therefore a mouse model of emphysema exposed to cigarette smoke(CS) was constructed which demonstrated increased PIK3CA expression and EMT activation in bronchial epithelial cells with increased apoptosis by immunohistochemical and immunofluorescence. In vitro, it was further confirmed the expression of PIK3CA and the activation of EMT by cigarette smoke extract (CSE)-incubated BEAS-2B cells. By PIK3CA knockout, it was proved that PIK3CA plays an important role in the EMT process.</p></div><div><h3>Results</h3><p>Through the analysis of mRNA sequencing data of fresh pulmonary specimens from smokers with COPD and non-smokers without COPD, we found that EMT plays a core role in COPD. Through analysis of GSEA and PPI, we found that PIK3CA is a key gene in COPD. By studying the established mouse model of COPD and BEAS-2B cells incubated with CSE, we found that CS exposure increased PIK3CA expression and associated EMT activation. CSE can induce EMT in vitro by increasing PIK3CA expression, and knockout PIK3CA can reverse CSE-induced EMT.</p></div><div><h3>Conclusion</h3><p>Cigarette smoke induces EMT in bronchial epithelial cells by up-regulating PIK3CA expression. PIK3CA knockdown reversed CSE-induced EMT. EMT and PIK3CA may be potential new targets for the treatment of COPD in the future.</p></div>","PeriodicalId":12673,"journal":{"name":"Gene Reports","volume":null,"pages":null},"PeriodicalIF":1.0000,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Gene Reports","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2452014424001171","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GENETICS & HEREDITY","Score":null,"Total":0}
引用次数: 0
Abstract
Background
Airway remodeling caused by smoking is an important pathological change in chronic obstructive pulmonary disease (COPD), and epithelial-mesenchymal transition (EMT) is one of the core mechanisms involved in airway remodeling. However, the exact molecules and pathway mechanisms involved in the induction of EMT in COPD remain largely unknown. Numerous previous studies have elucidated that overexpression of PIK3CA promotes the proliferation and metastasis in various types of tumors by inducing EMT, while inhibition of PIK3CA can inhibit the invasion and proliferation of tumors. However, the relationship between PIK3CA and EMT has not been reported in COPD.
Methods
Fresh pulmonary specimens were collected away from the tumor site from the smoker with COPD (n = 9) and non-smokers without COPD control group (n = 9) who underwent lung tissue resection, and conducted deep sequencing of lung tissue mRNA. It was found that the PIK3CA and EMT pathways play a significant role in the development of COPD using bioinformatics. Therefore a mouse model of emphysema exposed to cigarette smoke(CS) was constructed which demonstrated increased PIK3CA expression and EMT activation in bronchial epithelial cells with increased apoptosis by immunohistochemical and immunofluorescence. In vitro, it was further confirmed the expression of PIK3CA and the activation of EMT by cigarette smoke extract (CSE)-incubated BEAS-2B cells. By PIK3CA knockout, it was proved that PIK3CA plays an important role in the EMT process.
Results
Through the analysis of mRNA sequencing data of fresh pulmonary specimens from smokers with COPD and non-smokers without COPD, we found that EMT plays a core role in COPD. Through analysis of GSEA and PPI, we found that PIK3CA is a key gene in COPD. By studying the established mouse model of COPD and BEAS-2B cells incubated with CSE, we found that CS exposure increased PIK3CA expression and associated EMT activation. CSE can induce EMT in vitro by increasing PIK3CA expression, and knockout PIK3CA can reverse CSE-induced EMT.
Conclusion
Cigarette smoke induces EMT in bronchial epithelial cells by up-regulating PIK3CA expression. PIK3CA knockdown reversed CSE-induced EMT. EMT and PIK3CA may be potential new targets for the treatment of COPD in the future.
Gene ReportsBiochemistry, Genetics and Molecular Biology-Genetics
CiteScore
3.30
自引率
7.70%
发文量
246
审稿时长
49 days
期刊介绍:
Gene Reports publishes papers that focus on the regulation, expression, function and evolution of genes in all biological contexts, including all prokaryotic and eukaryotic organisms, as well as viruses. Gene Reports strives to be a very diverse journal and topics in all fields will be considered for publication. Although not limited to the following, some general topics include: DNA Organization, Replication & Evolution -Focus on genomic DNA (chromosomal organization, comparative genomics, DNA replication, DNA repair, mobile DNA, mitochondrial DNA, chloroplast DNA). Expression & Function - Focus on functional RNAs (microRNAs, tRNAs, rRNAs, mRNA splicing, alternative polyadenylation) Regulation - Focus on processes that mediate gene-read out (epigenetics, chromatin, histone code, transcription, translation, protein degradation). Cell Signaling - Focus on mechanisms that control information flow into the nucleus to control gene expression (kinase and phosphatase pathways controlled by extra-cellular ligands, Wnt, Notch, TGFbeta/BMPs, FGFs, IGFs etc.) Profiling of gene expression and genetic variation - Focus on high throughput approaches (e.g., DeepSeq, ChIP-Seq, Affymetrix microarrays, proteomics) that define gene regulatory circuitry, molecular pathways and protein/protein networks. Genetics - Focus on development in model organisms (e.g., mouse, frog, fruit fly, worm), human genetic variation, population genetics, as well as agricultural and veterinary genetics. Molecular Pathology & Regenerative Medicine - Focus on the deregulation of molecular processes in human diseases and mechanisms supporting regeneration of tissues through pluripotent or multipotent stem cells.