PC-3/N cells35 (link) were treated with ROB and/or DOC for 24 h, and then the cells were harvested in 1× reporter lysis buffer (Promega, Madison, WI, USA). After centrifugation, 10 µl aliquots of the supernatants were mixed with 10 µl of luciferase substrate (Promega) and measured for the luciferase activity by using a Luminometer LuMate™ (Awareness Technology, Palm City, FL, USA). The luciferase activity was normalised against known protein concentrations and expressed as the percentage of luciferase activity in the control cells. The protein level was determined by Bio-Rad protein assay kits (Bio-Rad, Hercules, CA, USA) according to the manufacturer's instructions.
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