OBJECTIVE:To investigate the relationship between nuclear factor(NF-κB)activity and proteasome inhibitor-mediated cell death in undifferentiated thyroid cancer cells.METHODS:Seven undifferentiated thyroid cancer cell lines were treated with proteasome inhibitors(PSI,EPOX and MG132).The cell viability,toxicity and death were measured by MTT assay,LDH release assay and FCM,respectively.DNA binding activity of NF-κB and Caspase-3 activity were analyzed by ELISA.RESULTS:ARO and 8305C cells were completely insen...