Journal: Molecular Therapy Oncolytics
Article Title: Potential for reversing miR-634 -mediated cytoprotective processes to improve efficacy of chemotherapy against oral squamous cell carcinoma
doi: 10.1016/j.omto.2022.02.002
Figure Lengend Snippet: Identification of the cIAP1 gene as a miR-634 direct target (A) Induction of apoptotic cell death by overexpression of miR-634 in SAS and Ca9-22 cells. Cells were evaluated at day 2 after transfection with 20 nM miR-NC or miR-634 . Upper: phase-contrast images in the miRNA-transfected cells. Scale bars: 20 μm. Lower: FACS analysis of the apoptotic cell population. (B) Western blot analysis of the miRNA-transfected cells. Cell lysates were prepared two days after transfection. (C) Identification of miR-634 target genes by RIP-Chip analysis in SAS and A431 cells. In total, 3,491 and 1,459 genes were identified as the candidates with a fold change (FC) > 2.0 by RIP-Chip analysis in SAS and A431 cells, respectively; 1,313 genes identified by both analyses were defined as the miR-634 target genes. (D) RIP-PCR analysis of the cIAP1 gene. Enrichment relative to IgG immunoprecipitation in miR-NC -transfected cells is presented. (E) Western blot analysis of cIAP1 in the miRNA-transfected cells. (F) The positions of two putative miR-634 binding sites (site 1; S1 and site 2; S2) within the coding region of the cIAP1 gene (accession No. NM_001166 ; 3,764 bp) are indicated. (G) Luciferase assay using reporter plasmids. Seed sequences of miR-634 and its mutant sequences are indicated. SAS cells were cotransfected with a reporter plasmid and an internal control vector, and after 5 h, either miR-NC or miR-634 was additionally transfected. Thirty-six hours after transfection, luciferase activity was measured. The luciferase activity in miR-634 -transfected cells relative to that in miR-NC -transfected cells is indicated on the vertical axis. In (A), (D), and (G), error bars indicate the SD of triplicate experiments, and data are presented as the mean ± SD. p values were calculated using the two-sided Student's t test (A and D) or one-way ANOVA (G). ∗p < 0.0001, ∗∗p < 0.005. NS, not significant.
Article Snippet: Among the 1,313 genes, we found cIAP1 , whose expression is involved in chemotherapeutic resistance, including CDDP (listed as BIRC2 in ; FC:5.22 in A431 cells and FC:10.01 in SAS cells).
Techniques: Over Expression, Transfection, Western Blot, RNA Immunoprecipitation - Chromatin Immunoprecipitation, Immunoprecipitation, Binding Assay, Luciferase, Mutagenesis, Plasmid Preparation, Control, Activity Assay