Overexpression of miR-382-5p Overexpression Mediated Downregulation of PTEN on Malignant Biological Behavior of Human Glioma U251 Cells

  Objective  To investigate the effect of overexpression of miR-382-5p overexpression on malignant biological behavior of human glioma U251 cells.

  Methods  U251 cells were transfected with miR-382-5pmimic. Then miR-382-5p and PTEN mRNA levels were detected by reverse transcription-polymerase chain reaction (RT-PCR) after transfection. Used bioinformatics to predicted the presence of base binding sites between miR-382-5p and PTEN, and constructed PTEN pcDNA vector overexpression plasmid was constructed. Luciluciase reporting experiment was used to detect the targeting relationship between miR-382-5p and PTEN. Cells were randomly divided into four groups: control group, mimics group, pc-PTEN group and mimics+pc-PTEN group for follow-up experiments. RT-PCR was carried out to detect the level of PTEN mRNA in each group. Cell proliferation was detected by clone formation method. The mRNA levels of Ki67, Survivin and c-Myc were detected by RT-PCR. Transwell experiment was used to assayed cell invasion ability. The expression levels of E-cadherin, N-cadherin and Vimentin were determined by Western blot.

  Results  Results showed that miR-382-5p directly targeted PTEN. Compared with the control group, miR-382-5p and c-Myc mRNA levels and E-cadherin protein level were increased (P<0.05), PTEN, Ki67 and Survivin mRNA levels were decreased (P<0.05), cell clonal formation rate and cell invasion number were decreased (P<0.05), N-cadherin and Vimentin protein levels were decreased (P<0.05) in the mimics group; In pc-PTEN group, miR-382-5p mRNA and c-Myc mRNA levels and E-cadherin protein level were decreased (P<0.05), PTEN, Ki67 and Survivin mRNA levels were increased (P<0.05), cell clonal formation rate and cell invasion number were increased (P<0.05), N-cadherin and Vimentin protein levels were increased (P<0.05). Compared with pc-PTEN group, PTEN, Ki67 and Survivin mRNA levels, the cell clone formation rate, the number of invasion cells and the N-cadherin and Vimentin levels of mimics+PC-PTEN group decreased significantly (P<0.05), while the c-Myc mRNA level and E-cadherin protein level increased significantly (P<0.05).

  Conclusion  Overexpression of miR-382-5p mediates the downregulation of PTEN expression, causing the inhibition of the proliferation, invasion, growth and EMT of U251 glioma cells.