Transient cell transfections were performed with jetPEI™ (Polyplus transfection, Illkirch, France). The pRLTK-Renilla luciferase expression vector was co-transfected in all experiments to monitor transfection efficiencies. Luciferase activity was determined with the dual-Luciferase reporter assay system (Promega, Charbonnieres, France). The (CAGA)9-Lux was used as reporter constructs specific for Smad3/4-driven signaling (18). The 8xGTIIC-Luc (gift from Stefano Piccolo, Addgene plasmid #34615; http://n2t.net/addgene:34615; RRID : Addgene-34615; (TEAD)8-lux in the text) construct was used as a reporter construct specific for TEAD-driven signaling.
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