Ectopic overexpression of β-catenin induces cell death via induction of c-Jun and p73. MM.1S cells were transiently transfected with plasmids expressing β-catenin (pCat) or empty vector only. (A) Cell lysates (48 hours after transfection) were immunoblotted with the indicated antibodies. (B) Cell survival was measured by MTT assay at indicated times.