To measure Bax or PUMA promoter activity, H1299 cells were transfected with expression vectors encoding p53, PARP1 and HIPK2, along with the PUMA- or Bax-luciferase reporter vector (kindly provided by Dr G D'Orazi, Regina Elena Cancer Institute, Rome, Italy) and control pRL-TK plasmids. At 24 h after the transfection, dual luciferase activity assay was carried out using dual luciferase reporter assay kit (Promega) according to the manufacturer's protocol.
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