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2018 ; 9
(26
): 18386-18399
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Comprehensive analysis of aberrantly expressed lncRNAs and construction of ceRNA
network in gastric cancer
#MMPMID29719612
Arun K
; Arunkumar G
; Bennet D
; Chandramohan SM
; Murugan AK
; Munirajan AK
Oncotarget
2018[Apr]; 9
(26
): 18386-18399
PMID29719612
show ga
Gastric cancer remains fifth most common cancer often diagnosed at an advanced
stage and is the second leading cause of cancer-related death worldwide. Long
non-coding RNAs (lncRNAs) involved in various cellular pathways are essential for
tumor occurrence and progression and they have high potential to promote or
suppress the expression of many genes. In this study, we profiled 19 selected
cancer-associated lncRNAs in thirty gastric adenocarcinomas and matching normal
tissues by qRT-PCR. Our results showed that most of the lncRNAs were
significantly upregulated (12/19). Further, we performed bioinformatic screening
of miRNAs that share common miRNA response elements (MREs) with lncRNAs and their
downstream mRNA targets. The prediction identified three microRNAs (miR-21,
miR-145 and miR-148a) and five gastric cancer-specific target genes (EGFR, KLF4,
DNMT1 and AGO4) which also showed strong correlation with lncRNAs in regression
analysis. Finally, we constructed an integrated lncRNA-miRNA-mRNA interaction
network of the candidate genes to understand the post-transcriptional gene
regulation. The ceRNA network analysis revealed that the differentially regulated
miR-21 and miR-148a were playing as central candidates coordinating sponging
activity of the lncRNAs analyzed (H19, TUG1 and MALAT1) in this study and the
overexpression of H19 and miR-21 could be a signature event of gastric
tumorigenesis that could serve as prognostic indicators and therapeutic targets.