Journal: American Journal of Cancer Research
Article Title: MiRNA-1469 promotes lung cancer cells apoptosis through targeting STAT5a
doi:
Figure Lengend Snippet: Stat5a is a direct target of miRNA-1469. A. MiR-1469 targeting site resides at nucleotides 226-232 of Stat5a-3’UTR and is highly conserved in different species. Upper panel: sequence alignment of miR-1469 with binding sites on the Stat5a-3’UTR. Bottom panel: sequence of the miR-1469 binding site within the Stat5a-3’UTR of three species (human, chimpanzee and rhesus). B. Diagram of the luciferase reporter plasmids including plasmid with the full-length Stat5a-3’UTR insert (pIS0-Stat5a-3’UTR) and plasmid with a mutant Stat5a-3’UTR (pIS0-Stat5a-3’UTR-mut) which carried a substitution of three nucleotides within the miR-1469 binding site. C. Luciferase activity assay demonstrates a direct targeting of the Stat5a-3’UTR by miR-1469. A549 cells (left panel) and H1650 cells (right panel) were transfected with miR-1469 mimics (20 nM) and pIS0-Stat5a-3’UTR /pIS0-Stat5a-3’UTR-mut. pRL-SV40 Renilla was used for the normalization of transfection efficiency. After 48 h, the luciferase activities were measured. D. Western blotting was used to detect the expression of the Stat5a protein after miRNA-1469 mimics (20 nM) or miRNA-1469; Inhibitor (40 nM) transfection of A549 (left panel) or H1650 (right panel) cells. E. Stat5a mRNA in the A549 (left panel) or H1650 (right panel) cell lines treated as above was measured with real-time RT-PCR. β-actin was used as internal control. F. Overexpression of miR-1469 mimics (20 nM) or miRNA-1469.Inhibitor (40 nM) in A549 or H1650 cell lines transfected miRNA-1469 mimics or miRNA-1469. Inhibitor was measured by real-time RT-PCR. U6 was used as internal control. *, p < 0.05; **, p < 0.01; ***, p < 0.001.
Article Snippet: The antibodies against Stat5a (Santa Cruz Biotechnology, Santa Cruz, CA, USA, sc-1081), phosphorylated H2AX (gH2AX) (Cell Signaling Technology, Beverly, MA, USA, # 9718), Bcl-2 and b-actin (Cell Signaling Technology, #4970) were respectively used to detect their targeting proteins: Statistical analysis Data were presented as mean±SD from at least three separate experiments, and Student’s t-test analysis was performed using SPSS 17.0 software.
Techniques: Sequencing, Binding Assay, Luciferase, Plasmid Preparation, Mutagenesis, Activity Assay, Transfection, Western Blot, Expressing, Quantitative RT-PCR, Control, Over Expression