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Food Chem Toxicol. 2019 Apr;126:223-232. doi: 10.1016/j.fct.2019.02.030. Epub 2019 Feb 25.

Auriculasin sensitizes primary prostate cancer cells to TRAIL-mediated apoptosis through up-regulation of the DR5-dependent pathway.

Author information

1
Department of Food Science and Technology, Kyungpook National University, Daegu, 41566, Republic of Korea.
2
Department of Food Science, University of Arkansas, AR, 72704, USA.
3
Institute of Agriculture Life Science, Dong-A University, Busan, 49315, Republic of Korea.
4
Division of Applied Life Science (BK21 plus), IALS, Gyeongsang National University, Jinju, 52828, Republic of Korea.
5
Department of Biotechnology, Dong-A University, Busan, 49315, Republic of Korea. Electronic address: kseo@dau.ac.kr.

Abstract

Primary prostate cancer cells frequently develop resistance toward chemotherapy as well as most chemotherapeutics have been reported to induce undesirable cytotoxicity in normal cells. In this study, we performed sensitizing activity analysis of auriculasin (AC) to tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) in RC-58T/h/SA#4 primary prostate cancer cells without significant cytotoxicity in RWPE-1 prostate epithelial cells. Combined treatment with AC and TRAIL at optimal concentrations resulted in tumor-specific apoptotic cell death in RC-58T/h/SA#4 cells, characterized by DNA fragmentation, accumulation of apoptotic cell population, and nuclear condensation. Compared to single treatment with AC or TRAIL, co-treatment with AC and TRAIL significantly increased expression of Bax, cleaved PARP, AIF, endo G, and cytochrome c but decreased expression of phosphorylation of AKT and mammalian target of rapamycin (mTOR), phosphoinositide 3-kinase (PI3K), Bcl-2 and caspases-9, -8, -3, and -10. The sensitizing effect of AC to TRAIL was well correlated with inhibition of death receptor 5 (DR5) CHOP, and p53 expression. Moreover, pre-treatment with a chimeric blocking antibody for DR5 effectively reduced AC-TRAIL-induced cell death and apoptosis-related protein expression. These results suggest that non-toxic concentrations of AC sensitize TRAIL-resistant primary prostate cancer cells to TRAIL-mediated apoptosis via up-regulation of DR5 and downstream signaling pathways.

KEYWORDS:

Apoptosis; Auriculasin; Death receptor 5; Primary prostate cancer; Tumor necrosis factor-related apoptosis-inducing ligand

PMID:
30817944
DOI:
10.1016/j.fct.2019.02.030
[Indexed for MEDLINE]

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