A Competing Endogenous RNA Network Identifies Novel MRNA,miRNA,and LncRNA Markers In Human Cholangiocarcinoma

Objective: Cholangiocarcinoma(CCA)is the second most common malignant primary liver tumor and has shown an alarming increase in incidence over the last two decades.However,the mechanisms behind tumorigenesis and progression remain insufficient.The present study aimed to uncover the underlying regulatory mechanism on CCA and find novel biomarkers for the disease prognosis.Methods: The RNA-sequencing datasets of lncRNAs,miRNAs,and mRNAs in CCA as well as relevant clinical information were obtained from the Cancer Genome Atlas(TCGA)database.After pretreatment,differentially expressedRNAs(DERNAs)were identified and further interrogated for their correlations with clinical information.PrognosticRNAs were selected using univariate Cox regression.Then,a ceRNA network was constructed based on theseRNAs.Results: We identified a total of five prognostic DEmiRNAs,63 DElncRNAs,and 90 DEmRNAs between CCA and matched normal tissues.Integrating the relationship between the different types ofRNAs,a lncRNA-miRNA-mRNA network was established and included 28 molecules and 47 interactions.Screened prognosticRNAs involved in the ceRNA network included 3 miRNAs(hsa-mir-1295 b,hsa-mir-33 b,and hsa-mir-6715a),7 lncRNAs(ENSG00000271133,ENSG00000233834,ENSG00000276791,ENSG00000241155,COL18A1-AS1,ENSG00000274737,and ENSG00000235052),and 18 mRNAs(ANO9,FUT4,MLLT3,ABCA3,FSCN2,GRID2 IP,NCK2,MACC1,SLC35E4,ST14,SH2D3 A,MOB3B,ACTL10,RAB36,ATP1B3,MST1 R,SEMA6A,and SEL1L3).Conclusions: Our study identified novel prognostic makers and predicted a previously unknown ceRNA regulatory network in CCA and may provide novel insight into a further understanding of lncRNA-mediated ceRNA regulatory mechanisms in CCA.