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[Effect of bortezomib on sensitization of HL-60 cells to TRAIL].

This study was aimed to explore whether bortezomib can sensitize HL-60 cells to TNF-related apoptosis-inducing ligand (TRAIL) and to investigate its possible mechanism. The HL-60 cells were treated by different concentrations of TRAIL combined with subtoxic concentration of bortezomib. The proliferative inhibition of treated HL-60 cell was analysed by MTT assay. The cell apoptosis was determined by flow cytometry with Annexin V/PI double staining and the expression of caspase-8 was detected by Western blot. The results showed that the subtoxic concentration of bortezomib combined with 10 ng/ml of TRAIL enhanced apoptosis of HL-60 cells, as compared with TRAIL used alone; the expression of caspase-8 increased correspondingly. It is concluded that subtoxic concentration of bortezomib can sensitize HL-60 cells to TRAIL and its mechanism may be related to upregulation of caspase-8 expression.