[No authors listed]
Increasing evidence has shown that abnormal expression of miR-4284 participates in the progression of several types of cancer. However, the expression and the role of miRâ4284 in gastric cancer remain largely unknown. Therefore, in the present study the miRâ4284 expression levels in gastric cancer tissues and cell lines, was examined using reverse transcriptionâquantitative polymerase chain reaction (RTâqPCR) and found that miRâ4284 was significantly upregulated in 40 pairs of gastric cancer tissues and five gastric cancer cell lines compared to the corresponding normal tissues and GESâ1 cell line. In addition, increased miRâ4284 expression was positively associated with TNM stage (P=0.035), distal metastasis (P=0.022) and poor prognosis in gastric cancer patients. Furthermore, the overexpression of miRâ4284 expression was shown to promote cell proliferation, clone formation, invasion and migration, while the suppression of miRâ4284 expression induced opposite effects. Additionally, luciferase reporter assay was conducted and showed that ten-eleven translocation 1 (TET1), a tumor suppressor gene that regulating cell survival and metastasis, was a direct target of miRâ4284. Upregulated miRâ4284 decreased the mRNA and protein levels of TET1 in SGCâ7901 cells and downregulated miRâ4284 increased the mRNA and protein levels of TET1 in AGS cells. In addition, miRâ4284 expression was negatively correlated with the TET1 expression in gastric cancer tissues. Moreover, inhibition of TET1 suppressed the effect of miRâ4284 inhibitors on cell proliferation in AGS cells. Therefore, data demonstrated that miRâ4284 could promote tumor cell growth, migration and invasion by directly targeting TET1 in gastric cancer, which may provide a potential therapeutic target for gastric cancer treatment.
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