Abstract
Both tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) and histone deacetylase inhibitors (HDIs) show promise for the treatment of cancer. However, in a number of reports they have been proven ineffective to induce cell death when applied as single agents. In this study, we show that A549 lung carcinoma cells and PC-3 prostate carcinoma cells underwent substantial apoptosis when coexposed to TRAIL and either suberoylanilide hydroxamic acid, sodium butyrate or trichostatin A. HDIs and TRAIL synergized in activation of capase-3, induction of internucleosomal DNA fragmentation and promoting mitochondrial damage. Significantly, cotreatment with minimally toxic doses of HDIs and TRAIL resulted in a marked apoptotic response in both cell lines. These data provide a rationale for a more in-depth exploration into the potential of combining TRAIL and HDIs as a valuable anticancer strategy.
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