Figure 3: CASC2 functions as a miR-18a decoy in CRC cells.

(A) The predicted positions of miR-18a/b and miR-4735 binding sites on the CASC2 transcript. (B) Schematic diagrams of two luciferase reporters containing the wild type CASC2 (psiCHECK2-CASC2-WT) and mutant CASC2 (psiCHECK2-CASC2-MU) abolishing targeting by miR-18a. Luciferase activity in CACO2 (C) and HT-29 (D) cells co-transfected with miR-18a or miR-4735 mimics and the indicated luciferase reporters or control. Renilla luciferase activity was measured and normalized to firefly luciferase. The experiment was repeated at least three times, and data are presented as the meanā±āSD (*Pā<ā0.05, Two-sided Studentās t-test; nā=ā3). (E) qRT-PCR for CASC2 levels in CRC cell lines transfected with miR-18a mimics, inhibitors or negative control (*Pā<ā0.05; Two-sided Studentās t-test; nā=ā3).