Hypoxia and low glucose differentially augments TRAIL-induced apoptotic death
- PMID:15792357
- DOI: 10.1007/s11010-005-5261-8
Hypoxia and low glucose differentially augments TRAIL-induced apoptotic death
Abstract
Tumor microenvironment, which is characterized by hypoxia, low-glucose concentrations, high-lactate concentrations, low-extracellular pH, can alter the therapeutic response in tumors. In this study, we investigated whether hypoxia affects TRAIL-induced apoptotic death. When human prostate adenocarcinoma DU-145 cells were treated with 50 ng/mL TRAIL or hypoxia for 4 h, the survival was 45.7 and 32.5%, respectively. The combination of TRAIL and hypoxia synergistically increased cell death. Similar results were observed in human prostate adenocarcinoma LNCaP cells. Western blot analysis showed that the hypoxia augmented TRAIL-induced PARP cleavage as well as the activation of caspase-8 and caspase-3, but not caspase-9. Unlike hypoxia, low glucose promoted caspase-9 activation during TRAIL treatment. These results suggest that hypoxia or low glucose-augmented TRAIL cytotoxicity is mediated through the mitochondria-independent pathway or -dependent pathway, respectively.
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