The protocol for the firefly luciferase reporter assay was described previously [18 (link)]. Briefly, 3.0 g of TCF/LEF luciferase reporter was added to culture flasks, and transfection was performed with LipofectamineTM 2000 (Invitrogen, Gaithersburg, MD, USA). Twenty-four hours after transfection, the treated cells were replanted in 24-well plates, and EGCG or DMSO was then added to the cells in each group. After 24 hours, the upper medium was collected for fluorescence activity detection using a Gaussia Luciferase Assay kit (New England Biolabs).
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