Luciferase reporter assay was performed according to a previously defined protocol20 (link),61 (link). Briefly, cells were seeded into 24-well plates and transfected with 16 ng cytomegalovirus-Renilla (Promega), 20 pmol miR-302d mimic or NC mimic, and 800 ng CDKN1AWT or CDKN1AMU. Cells were collected 72 h post transfection for luciferase activities measurement using the dual luciferase system (Promega) with a GloMax-96 luminometer. Renilla luciferase activities were taken as internal standard indicators for transfection efficiency. Firefly luciferase activities were further normalized to Renilla luciferase activities.
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