Upregulated long non-coding RNA SBF2-AS1 promotes proliferation in esophageal squamous cell carcinoma.

Abstract:

:Esophageal cancer is one of the most common types of malignant tumors located within the digestive system, with >50% of esophageal cancer cases worldwide occurring in China. Recent studies have demonstrated that long non-coding RNAs (lncRNAs) are frequently dysregulated in cancer; however, few lncRNAs have been characterized in esophageal squamous cell carcinoma (ESCC). In the present study, a novel lncRNA, SET-binding factor 2 (SBF2) antisense RNA1 (SBF2-AS1) was exhibited in ESCC. Expression levels of SBF2-AS1 in ESCC and adjacent non-cancerous tissues were detected using the reverse transcription-quantitative polymerase chain reaction. SBF2-AS1 was knocked down, and proliferation, migration, invasion, apoptosis and the cell cycle were examined in ESCC cells. Results identified that SBF2-AS1 was significantly upregulated in ESCC compared with adjacent non-cancerous tissues (fold increase, 8.82; P=0.023). The SBF2-AS1 expression level was significantly increased in patients who had a smoking (9.927 vs. 4.507; P=0.030) and/or drinking (10.938 vs. 4.232; P=0.032) history. Patients with a large tumor size exhibited increased SBF2-AS1 expression (≥4 vs. <4 cm, 14.898 vs. 5.435; P=0.018). Patients with advanced ESCC exhibited increased upregulation of SBF2-AS1 [tumor-node-metastasis (TNM) I-II vs. TNM III-IV, 1.302 vs. 15.475; P<0.01]. SBF2-AS1 was also silenced using small interfering RNA. Cell proliferative and invasive ability were significantly inhibited (P<0.05) following SBF2-AS1 silencing, the cell cycle was arrested in the G2 phase; however, there was no significant difference in the proportion of apoptotic cells. Gene Set Enrichment Analysis revealed that genes associated with cell cycle biological processes, including the cancer suppressor gene cyclin-dependent kinase 1A (CDKN1A), were significantly associated with SBF2-AS1 in ESCC tissues. Further validation confirmed that CDKN1A expression levels were increased in ECA-109 cells following SBF2-AS1 silencing. The results of the present study demonstrate that SBF2-AS1 is significantly upregulated in ESCC, and that silencing of SBF2-AS1 inhibits the proliferative and invasive ability of ESCC cells. SBF2-AS1 may be a novel biomarker and therefore a potential therapeutic target for ESCC.

journal_name

Oncol Lett

journal_title

Oncology letters

authors

Chen R,Xia W,Wang X,Qiu M,Yin R,Wang S,Xi X,Wang J,Xu Y,Dong G,Xu L,De W

doi

10.3892/ol.2018.7968

subject

Has Abstract

pub_date

2018-04-01 00:00:00

pages

5071-5080

issue

4

eissn

1792-1074

issn

1792-1082

pii

OL-0-0-7968

journal_volume

15

pub_type

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