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Gastric cancer is the fourth most common cancer and the second most frequent cause of cancer-associated mortality in the world. Previous studies have revealed that expression levels of microRNAs (miRNAs) are associated with the initiation and progression of several types of cancer, including gastric cancer. Previous studies have demonstrated that the abnormal expression of miRNA-136 may serve a function in the progression of several types of human cancer. However, the expression pattern of miR-136, its functions and underlying molecular mechanisms in gastric cancer remain unresolved. In the present study, it was revealed that the expression of miR-136 was aberrantly up regulated in gastric cancer tissues and cell lines. The suppression of miR-136 was able to inhibit proliferation and invasion in gastric cancer cell lines. Furthermore, phosphatase and tensin homolog (PTEN) was identified as a direct target gene of miR-136 in gastric cancer. PTEN was under expressed in gastric cancer tissues compared with non-tumor gastric tissues, and PTEN expression was negatively correlated with miR-136 expression. Furthermore, PTEN overexpression mimics the effects of miR-136 knockdown on gastric cancer cells. Additionally, miR-136 under expression decreased phospho-(p) AKT expression, but did not affect AKT expression in gastric cancer cells. In conclusion, the data of the present study suggest that miR-136 acts as an oncogene in gastric cancer via regulation of the PTEN/AKT/p-AKT signaling pathway and may potentially serve as a novel therapeutic target for the treatment of gastric cancer.

Microrna-136 promotes proliferation and invasion ingastric cancer cells through Pten/Akt/P-Akt signaling pathway