title: Lentiviral vector-mediated RBM5 overexpression downregulates EGFR expression in human non-small cell lung cancer cells.
abstract: BACKGROUND
  RNA binding motif 5 (RBM5) is a tumor suppressor gene that modulates apoptosis through the regulation of alternative splicing of apoptosis-related genes. Our previous studies suggested that RBM5 expression was negatively correlated with the expression of epidermal growth factor receptor (EGFR) in non-small cell lung cancer (NSCLC) tissues. This study was aimed at determining whether RBM5 is able to regulate EGFR expression.
  
  
  METHODS
  Both in vitro and in vivo studies were carried out to determine the effect of RBM5 on the expression of EGFR. Lentiviral vector-mediated RBM5 overexpression was employed in lung adenocarcinoma cell line A549. A549 xenograft mice were treated with recombinant RBM5 plasmid carried by attenuated Salmonella typhi Ty21a. Real-time quantitative polymerase chain reaction and Western blot were carried out to detect RBM5 and EGFR expression.
  
  
  RESULTS
  Both in vivo and in vitro studies indicated that the expression of EGFR mRNA and protein was decreased significantly in the RBM5 overexpression group compared to control groups as shown by real-time PCR and Western blot analysis. We identified that RBM5 overexpression inhibited EGFR expression both in A549 cells and in A549 xenograft mice model.
  
  
  CONCLUSIONS
  Our study demonstrated that EGFR expression is regulated by RBM5 in lung adenocarcinomas cells either in a direct or indirect way, which might be meaningful with regards to target therapy in lung cancer.
authors.forename: Zhenzhong
authors.initials: Z
authors.lastname: Su
authors.forename: Jinzhi
authors.initials: J
authors.lastname: Yin
authors.forename: Lijing
authors.initials: L
authors.lastname: Zhao
authors.forename: Ranwei
authors.initials: R
authors.lastname: Li
authors.forename: Hong
authors.initials: H
authors.lastname: Liang
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Respiratory Medicine, The Second Affiliated Hospital of Jilin University, No,218 Ziqiang Street, Nanguan District, Changchun, Jilin 130041, China. kewangm1@hotmail.com.
authors.forename: Ke
authors.initials: K
authors.lastname: Wang
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D000818:Animals; D015153:Blotting, Western; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D066246:ErbB Receptors / Q000235:genetics / Q000378:metabolism*; D005260:Female; D006801:Humans; D016086:Lentivirus / Q000235:genetics*; D008175:Lung Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D010957:Plasmids / Q000008:administration & dosage; D012333:RNA, Messenger / Q000235:genetics; D016601:RNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014407:Tumor Cells, Cultured; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism*; D023041:Xenograft Model Antitumor Assays
chemical_list: D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; C473448:RBM5 protein, human; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D025521:Tumor Suppressor Proteins; C512478:EGFR protein, human; D066246:ErbB Receptors