The bladder cancer (T24) cells were purchased from the ATCC (Manassas, VA, USA) and cultured using Dulbecco’s modified Eagle’s medium (DMEM) supplemented with 10% fetal bovine serum (FBS) at 37 °C in a 5% CO2 incubator. 4′,6-diamidino-2-phenylindole (DAPI) was acquired from Molecular Probes (Eugene, OR, USA). Dojindo Laboratories (Kumamoto, Japan) supplied the cell counting kit 8 (CCK-8), and BD PharMingen (Heidelberg, Germany) supplied the Annexin V-fluorescein isothiocyanate (FITC) Apoptosis Detection kit. Genepharma (Shanghai, China) synthesized and supplied the siRNAs. The circPRMT5-targeting siRNA consisted of a sense strand 5′-AUCUUCCGGCUCCUCAAGUUCTT-3′ and an antisense strand 5′-GAACUUGAGGAGCCGGAAGAUTT-3′. The scrambled negative control siRNA (NC)-siRNA also consisted of a sense strand 5′-UUCUCCGAACGUGUCACGUUU-3′ and an antisense strand 5′-ACGUGACACGUUCGGAGAAUU-3′. The sequence of the FAM and Cy5-labeled (fluorescent) NC-siRNAs was the same, and the dye was attached to the antisense strand.
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