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A novel long noncoding RNA-LOWEG is low expressed in gastric cancer and acts as a tumor suppressor by inhibiting cell invasion

  • Original Article – Cancer Research
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Abstract

Purpose

Long noncoding RNA (lncRNA) have been reported to be involved in the development of multiple cancers. The aim of this study was to report the identification of lncRNA-CTD-2108O9.1, which we have named lncRNA low expressed in gastric cancer (lncRNA-LOWEG), and investigate its role in cancer development.

Methods

Total RNA was extracted from the tissues of 94 patients with GC, one normal gastric epithelial cell line and four GC cell lines. Expression levels of lncRNA-LOWEG were determined by real-time PCR. Moreover, CCK-8 proliferation assay, transwell cell invasion assay and flow cytometry were performed to study the effects of lncRNA-LOWEG on SGC-7901 cell proliferation, cell invasion and cell cycle progression. Lastly, western blot and real-time PCR were used to verify the potential target genes of lncRNA-LOWEG.

Results

Significantly reduced expression of lncRNA-LOWEG was found in gastric cancer tissues and cell lines (SGC-7901, AGS, BGC-823 and HG-27) compared with patient-matched nontumorous adjacent tissues (P < 0.01) or the normal gastric cell line GES-1 (P < 0.05). Moreover, the transwell assay showed that the number of cells capable of passing through the Matrigel was significantly reduced after lncRNA-LOWEG transfection (P < 0.05). However, lncRNA-LOWEG overexpression did not significantly influence cell proliferation (P > 0.05) and cell cycle progression (P > 0.05). Lastly, western blot and real-time PCR analysis suggested that lncRNA-LOWEG is positively correlated with the expression of leukemia inhibitory factor receptor (LIFR) gene at the translational level.

Conclusions

LncRNA-LOWEG is a tumor suppressor that inhibits GC cell invasion. And LIFR gene is up-regulated by lncRNA-LOWEG.

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Acknowledgments

This work was supported by National Science Foundation of China (Nos. 81201888, 81372549 and No. 81172370), Specialized Research Fund for the Doctoral Program of Higher Education (No. 20122104110009) and Natural Science Foundation of Liaoning Province (No. 2014029201), Program of Education Department of Liaoning Province (L2014307).

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Correspondence to Zhen-ning Wang.

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The authors declare that they have no competing interests.

Ethical standards

This study was conducted according to the principles expressed in the Declaration of Helsinki. Tissue specimens were collected after obtaining the informed consent of patients in accordance with institutional ethical guidelines, which were reviewed and approved by the Research Ethics Committee of China Medical University (Shenyang, China).

Additional information

Jun-hua Zhao and Jing-xu Sun have contributed equally to this work.

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Figure S1

The effect of lncRNA-LOWEG on cell proliferation and the cell cycle. Overexpression of lncRNA-LOWEG did not cause significant differences in cell proliferation and cell cycle detection. (A) Twenty-four hours after transfection, cells were plated in 96-well plates. After 24, 48, 72 and 96 h, cell proliferation was measured using a CCK-8 assay. Data are presented as mean ± SD. Experiments were independently conducted three times to obtain the presented data. (B) Representative results of a cell cycle assay by flow cytometry 48 h after transfection. (C) Statistical results are based on four independent experiments (Mean ± SD) of cell cycle detection. (TIFF 4871 kb)

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Zhao, Jh., Sun, Jx., Song, Yx. et al. A novel long noncoding RNA-LOWEG is low expressed in gastric cancer and acts as a tumor suppressor by inhibiting cell invasion. J Cancer Res Clin Oncol 142, 601–609 (2016). https://doi.org/10.1007/s00432-015-2071-6

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