标题：High miR-718 Suppresses Phosphatase and Tensin Homolog (PTEN) Expression and Correlates to Unfavorable Prognosis in Gastric Cancer
作者：Liu, Shufang; Tian, Ying; Zhu, Chanchan; Yang, Xiaoqing; Sun, Qing
作者机构：[Liu, Shufang; Tian, Ying] Linyi Cent Hosp, Dept Clin Lab, Linyi, Shandong, Peoples R China.; [Zhu, Chanchan] Shandong Univ, Dept Pathol, Sch Med, J 更多
通讯作者：Yang, XQ;Sun, Q
通讯作者地址：[Yang, XQ; Sun, Q]Qianfoshan Hosp, Dept Pathol, Jinan, Shandong, Peoples R China.
来源：MEDICAL SCIENCE MONITOR
关键词：MicroRNAs; Prognosis; PTEN Phosphohydrolase; Stomach Neoplasms
摘要：Background: Phosphatase and tensin homolog (PTEN) is a kind of phosphatase which has been demonstrated to suppress progression of gastric cancer. Many micro-RNAs (miRNAs), such as miR-106b, miR-93, and miR-200c, could inhibit expression of PTEN in cell lines; and many miRNAs including miR-21, miR-22, miR-18a, and miR-222 are related to the progression and prognosis of gastric cancer. However, among these miRNAs, the clinical significance of miR-718 has not yet been elucidated.; Material/Methods: The expression of PTEN and miR-718 in 141 gastric cancer tissues were detected by immunohistochemistry and quantitative real-time PCR respectively. The correlation between PTEN, miR-718, and the clinicopathological factors was analyzed by chi(2) test. The prognostic significance of PTEN and miR-718 was evaluated by univariate and multivariate analysis. Luciferase reporter assay was performed to evaluate the regulation of PTEN by miR-718. The effect of miR-718 on gastric cancer proliferation and invasion was investigated by MTT assay and Transwell assay.; Results: Low expression of PTEN and high expression of miR-718 were both significantly associated with unfavorable prognosis, and both were identified as biomarkers predicting poorer prognosis of patients with gastric cancer. Increased miR-718 expression could decrease PTEN expression, thus enhancing phosphatidylinositide 3-kinases/protein kinase B (PI3K/Akt) signaling. Moreover, the abilities of proliferation and invasion of gastric cells transfected with miR-718 were promoted significantly compared with those transfected with control miRNA.; Conclusions: Low expression of PTEN and increased expression of miR-718 in gastric cancer tissues were both independent unfavorable prognostic factors of gastric cancer. Upregulation of miR-718 could increase PI3K/Akt signaling by directly downregulating PTEN, thus promoting the proliferation and invasion of gastric cancer cells.