Abstract
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) is known to cause apoptosis in several types of malignant tumor cells through its interaction with the death domain-containing receptor, death receptor 5 (DR5). In the present study, we showed that co-treatment with troglitazone (TGZ), a synthetic ligand of peroxisome proliferator-activated receptor γ (PPARγ), and TRAIL synergistically induced apoptosis through DR5 upregulation in human colon cancer DLD-1 cells. TGZ elevated DR5 expression at the promoter level through the CCAAT/enhancer-binding protein homologous protein (CHOP) binding site. These results suggest that combined treatment with TGZ and TRAIL may be promising as a new therapy against malignant tumors.
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