title: Differential expression profiles of long non-coding RNAs reveal potential biomarkers for identification of human gastric cancer.
abstract: Gastric cancer (GC) is one of the most lethal malignancies worldwide. To reduce its high mortality, sensitive and specific biomarkers for early detection are urgently needed. Recent studies have reported that tumor-specific long non-coding RNAs (lncRNAs) seem to be potential biomarkers for the early diagnosis and treatment of cancer. In the present study, lncRNA and mRNA expression profiling of GC specimens and their paired adjacent non-cancerous tissues was performed. Differentially expressed lncRNAs and mRNAs were identified through microarray analysis. The function of differential mRNA was determined by gene ontology and pathway analysis and the functions of lncRNAs were studied by constructing a co-expression network to find the relationships with corresponding mRNAs. We connected the co-expression network, mRNA functions, and the results of the microarray profile differential expression and selected 14 significantly differentially expressed key lncRNAs and 21 key mRNAs. Quantitative RT-PCR (qRT-PCR) was conducted to verify these key RNAs in 50 newly diagnosed GC patients. The data showed that RP5-919F19, CTD-2541M15 and UCA1 was significantly higher expressed. AP000459, LOC101928316, RP11-167N4 and LINC01071 expression was significantly lower in 30 advanced GC tumor tissues than adjacent non-tumor tissues P<0.05. Then, we further validated the above significant differential expression candidate lncRNAs in 20 early stage GC patients. Results showed that CTD-2541M15 and UCA1 were significantly higher expressed, AP000459, LINC01071 and MEG3 expression was significantly lower in 20 early stage GC patient tumor tissues than adjacent non-tumor tissues (P<0.05). In addition, expression of these lncRNAs shows gradual upward trend from early stage GC to advanced GC. Furthermore, conditional logistic regression analysis revealed the aberrant expression of CTD-2541M15, UCA1 and MEG3 closely linked with GC. There is a set of differentially expressed lncRNAs in GC which may be associated with the progression and development of GC. The differential expression profiles of lncRNAs in GC may be promising biomarkers for the early detection and early screening of high‑risk populations.
authors.affiliation: Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, Jiangsu 210009, P.R. China.
authors.forename: Chengyun
authors.initials: C
authors.lastname: Li
authors.affiliation: Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, Jiangsu 210009, P.R. China.
authors.forename: Geyu
authors.initials: G
authors.lastname: Liang
authors.affiliation: Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, Jiangsu 210009, P.R. China.
authors.forename: Wenzhuo
authors.initials: W
authors.lastname: Yao
authors.affiliation: Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, Jiangsu 210009, P.R. China.
authors.forename: Jing
authors.initials: J
authors.lastname: Sui
authors.affiliation: Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, Jiangsu 210009, P.R. China.
authors.forename: Xian
authors.initials: X
authors.lastname: Shen
authors.affiliation: Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, Jiangsu 210009, P.R. China.
authors.forename: Yanqiu
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, Jiangsu 210009, P.R. China.
authors.forename: Shumei
authors.initials: S
authors.lastname: Ma
authors.affiliation: Gansu Wuwei Tumor Hospital, Wuwei, Gansu 733000, P.R. China.
authors.forename: Yancheng
authors.initials: Y
authors.lastname: Ye
authors.affiliation: Gansu Wuwei Tumor Hospital, Wuwei, Gansu 733000, P.R. China.
authors.forename: Zhiyi
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Gansu Wuwei Tumor Hospital, Wuwei, Gansu 733000, P.R. China.
authors.forename: Wenhua
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, Jiangsu 210009, P.R. China.
authors.forename: Lihong
authors.initials: L
authors.lastname: Yin
authors.affiliation: Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, Jiangsu 210009, P.R. China.
authors.forename: Yuepu
authors.initials: Y
authors.lastname: Pu
mesh_terms: D000368:Aged; D014408:Biomarkers, Tumor / Q000096:biosynthesis / Q000235:genetics* / Q000302:isolation & purification; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D062085:RNA, Long Noncoding / Q000096:biosynthesis* / Q000235:genetics*; D012333:RNA, Messenger / Q000096:biosynthesis; D013274:Stomach Neoplasms / Q000175:diagnosis / Q000235:genetics* / Q000473:pathology
chemical_list: D014408:Biomarkers, Tumor; C000611826:CTD-2541M15 long noncoding RNA, human; C498907:MEG3 non-coding RNA, human; D062085:RNA, Long Noncoding; D012333:RNA, Messenger; C515159:UCA1 RNA, human