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Advances in Brief |
The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21231-1000
The cornerstone of the systemic treatment of advanced colorectal cancer is 5-fluorouracil.However, 5-fluorouracil-induced apoptosis is dependent on p53, a tumor suppressor gene that is lost or inactivated in at least 85% of human colorectal cancers. Here we show that tumor necrosis factor-related apoptosis-inducing ligand (TRAIL)/Apo2L triggers caspase-8-mediated truncation of BID, mitochondrial activation of caspase-9, and apoptosis in both p53+/+ or p53-/- isogenic HCT116 colorectal cancer cells. TRAIL/Apo2L also sensitizes both p53+/+ or p53-/- colorectal cancer cells to ionizing radiation. In contrast, we find that TRAIL/Apo2L fails to activate caspase-9 or induce apoptosis in isogenic HCT116 colorectal cancer cells that are deficient in BAX, a proapoptotic gene that is mutated in >50% of colorectal cancers of the microsatellite mutator phenotype. Loss of BAX also renders colorectal cancer cells resistant to TRAIL/Apo2L-mediated radiosensitization. We additionally demonstrate that TRAIL/Apo2L-induced death of p53+/+- or p53-/-- BAX-proficient but not BAX-deficient colorectal cancer cells is augmented by reducing nuclear factor-
B-dependent expression of Bcl-xL with either a peptide that disrupts the inhibitor of B kinase complex or the nonsteroidal anti-inflammatory drug, sulindac sulfide. These results indicate that the combination of TRAIL/Apo2L with either irradiation or sulindac may be highly effective against both p53-proficient and p53-deficient colorectal cancers; however, BAX-deficient tumors may evade elimination by TRAIL/Apo2L-based regimens. Our findings may aid the development and genotype-specific application of TRAIL/Apo2L-based combinatorial regimens for the treatment of colorectal cancers.
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