Journal
MOLECULAR AND CELLULAR BIOCHEMISTRY
Volume 418, Issue 1-2, Pages 13-20Publisher
SPRINGER
DOI: 10.1007/s11010-016-2726-x
Keywords
Caffeic acid phenethyl ester; Tumor necrosis factor-related apoptosis-inducing ligand; Death receptor 5; C/EBP homologous protein
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology of Korea [2015R1D1A1A01060538]
- National Research Foundation of Korea [2015R1D1A1A01060538] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Caffeic acid phenethyl ester (CAPE) exhibits various pharmaceutical properties, including anti-bacterial, anti-inflammatory, anti-viral, anti-cancer, and anti-oxidative activity. Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) has been a promising anti-cancer agent that preferentially induces cancer cell apoptosis with negligible cytotoxicity toward normal cells. Therefore, the present study investigated whether CAPE promotes TRAIL-mediated cytotoxicity in hepatocarcinoma Hep3B cells. The present study demonstrated that CAPE sensitized TRAIL-mediated cell death in Hep3B carcinoma cells. The percentages of the apoptotic cells and annexin-V+ cells significantly increased in combined treatment with CAPE and TRAIL (CAPE/TRAIL). Treatment with pancaspase inhibitor, z-VAD-fmk, attenuated CAPE/TRAIL-induced apoptosis, suggesting that the combined treatment triggers caspase-dependent apoptosis. Additionally, we found that CAPE stimulated the expression of death receptor 5 (DR5) and treatment with DR5/Fc chimera protein significantly blocked CAPE/TRAIL-induced apoptosis, which indicates that CAPE/TRAIL stimulated apoptosis through the binding of TRAIL to DR5. Moreover, expression of transcription factor C/EBP homologous protein (CHOP) markedly increased in response to CAPE and transient knockdown of CHOP abolished CAPE/TRAIL-mediated apoptosis. These results suggest that CHOP is a key regulator in CAPE/TRAIL-mediated apoptosis. Taken together, the present study found that CAPE significantly enhanced TRAIL-mediated apoptosis in Hep3B carcinoma cells and suggested that CAPE has promising potential in chemoprevention of hepatocellular carcinomas.
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