Construction of a competing endogenous RNA network and identification of potential regulatory axes in gastric cancer chemoresistance

Emerging evidence highlights the multifunctional role of noncoding RNAs (ncRNAs) in gastric cancer (GC) chemoresistance. However, the comprehensive expression profile and competing endogenous RNAs (ceRNAs) regulatory network of GC chemoresistance remain unanswered.The whole-transcriptome sequencing (RNA sequencing) was performed to comprehensively analyze the differentially expressed (DE) lncRNAs, miRNAs and mRNAs in cisplatin-resistant cells MGC-803/DDP and GC cells MGC-803. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses were conducted to investigate the biological functions implicated with the DEncRNAs. Then, the cisplatin-resistant-related ceRNA network and potential regulatory axes were constructed by bioinformatic analysis.We successfully generated cisplatin-resistant GC cell line MGC-803/DDP. Differential expression analysis showed that a total of 1936 DElncRNAs, 2194 DEmRNAs and 174 DEmiRNAs were identified. Functional enrichment analysis indicated that those DEncRNAs were mainly involved in neuroactive ligand-receptor interaction, drug metabolism and Hippo signaling pathway. Subsequently, the cisplatin-resistant-related ceRNA network was constructed with the widely accepted vital chemo-resistant-related genes and signaling pathways. In addition, two constructed regulatory axes (include FAM66C/miR-129-5p/7 mRNAs and SFTA1P/miR-206/FN1 or NRP1) were successfully validated by the Genomic Data Commons (GDC) GC data.The novel ceRNA network and the potential regulatory axes may provide the most comprehensive view of GC chemoresistance to date. Our findings uncovered potential biomarkers for prognostic prediction and novel therapeutic targets for reversing cisplatin resistance in GC.