GSE175436
Expression profile of exosomal LncRNA in plasma of pancreatic ductal adenocarcinoma
Background:Exosomes are extracellular vesicles secreted by a variety of cells and are widely distributed in human body fluids. Exosomal long non-coding RNA (lncRNA) is a by-product of gene transcription and is involved in the regulation of cancer cell growth and migration. Numerous studies have identified aberrant lncRNA levels in pancreatic cancer (PC), but studies on exosomal lncRNA expression in pancreatic ductal adenocarcinoma (PDAC) plasma are relatively few and remain largely unknown. Methods:We studied the expression of exosomal lncRNAs and mRNAs in the plasma of 5 PDAC patients and 5 healthy human subjects using high-throughput sequencing. Results:A total of 43715 exosomal lncRNAs were found to be expressed in PDAC and healthy human plasma, of which 5851 were up-regulated, and 1055 were down-regulated in all 5 PDAC plasma (=2.0-fold change, P<0.05). The expression of eight significantly expressed genes (ABCD4, RP11-77P6.2, FLVCR1-AS1, HMBOX1, TUBA1C, RP11-115C21.2, PRKG1-AS1, and MTATP6P1) were selected to be measured in 5 patients using database and real-time quantitative reverse transcription PCR (qRT-PCR), and the data were consistent with those obtained from high-throughput sequencing. Analysis of their nearby coding genes (mRNAs) showed that the principal functions of most genes were to regulate cell metabolism process, apoptosis, protein binding and receptor binding. The main regulatory pathways included the ErbB signaling pathway, which regulates cell proliferation and differentiation, and the tumour pathway. Analysis of the co-expressed gene regulatory network identified key lncRNA-mRNA pairs that may play an important role in the pathogenesis of PDAC. Conclusions: Expression differences in exosomal lncRNAs exist between PDAC and healthy human plasma, so the expression profile of exosomal lncRNAs could explain the onset and development of PDAC and could also serve as a candidate biomarker for the diagnosis of PDAC and a potential therapeutic target. Overall design: Expression profile of exosomal LncRNA of pancreatic ductal adenocarcinoma (PDAC) patients and healthy human