Publication:
Involvement of endoplasmic reticulum stress and activation of MAP kinases in B-lapachone-induced human prostate cancer cell apoptosis

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Authors
Lien, Yi-Chen ; Kung, Hsiu-Ni ; Lu, Kuo-Shyan ; Jeng, Chung-Jiuan ; Chau, Yat-Pang
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
ß-Lapachone, an o-naphthoquinone, induces various carcinoma cells to undergo apoptosis, but the mechanism is poorly understood. In the present study, we found that the ß-lapachone-induced apoptosis of DU145 human prostate carcinoma cells was associated with endoplasmic reticulum (ER) stress, as shown by increased intracellular calcium levels and induction of GRP-78 and GADD-153 proteins, suggesting that the endoplasmic reticulum is a target of ß-lapachone. ß- Lapachone-induced DU145 cell apoptosis was dosedependent and accompanied by cleavage of procaspase- 12 and phosphorylation of p38, ERK, and JNK, followed by activation of the executioner caspases, caspase-7 and calpain. However, pretreatment with the general caspase inhibitor, z-VAD-FMK, or calpain inhibitors, including ALLM or ALLN, failed to prevent ß-lapachone-induced apoptotic cell death. Blocking the enzyme activity of NQO1 with dicoumarol, a known NQO1 inhibitor, or preventing an increase in intracellular calcium levels using BAPTA-AM, an intracellular calcium chelator, substantially inhibited MAPK phosphorylation, abolished the activation of calpain, caspase-12 and caspase-7, and provided significant protection of ßlapachone- treated cells. These findings show that ßlapachone- induced ER stress and MAP kinase phosphorylation is a novel signaling pathway underlying the molecular mechanism of the anticancer effect of ßlapachone.
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Citation
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