Abstract：
:Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) is a potent inducer of apoptosis of transformed and cancer cells but not of most normal cells. Recent studies have revealed an unforeseen toxicity of TRAIL toward normal human hepatocytes, thereby bringing into question the safety of systemic administration of TRAIL in humans with cancer. We found that SW480 colon adenocarcinoma, or H460 non-small cell lung cancer cell lines, which are sensitive to TRAIL, were not protected by the caspase 9 inhibitor Z-LEHD-FMK from TRAIL-induced apoptosis. However, a human colon cancer cell line HCT116 and a human embryonic kidney cell line 293, which are sensitive to TRAIL, were protected by Z-LEHD-FMK from TRAIL-mediated death. Both HCT116 and SW480 cells were protected from TRAIL by the caspase 8 inhibitor Z-IETD-FMK, dominant-negative FADD and cellular FLIP-s and interestingly both cell lines displayed caspase 9 cleavage to a similar extent after TRAIL exposure. We confirmed that normal human liver cells are sensitive to TRAIL. Moreover, we found that normal human liver cells could be protected from TRAIL-induced apoptosis by simultaneous exposure to Z-LEHD-FMK. A similar brief exposure to TRAIL plus Z-LEHD-FMK inhibited colony growth of SW480 but not HCT116 cells. Because some cancer cell lines are not protected from TRAIL-mediated killing by Z-LEHD-FMK, we believe that a brief period of caspase 9 inhibition during TRAIL administration may widen the therapeutic window and allow cancer cell killing while protecting normal liver cells. This strategy could be further developed in the effort to advance TRAIL into clinical trials.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Ozoren N,Kim K,Burns TF,Dicker DT,Moscioni AD,El-Deiry WSsubject
Has Abstractpub_date
2000-11-15 00:00:00pages
6259-65issue
22eissn
0008-5472issn
1538-7445journal_volume
60pub_type
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