Ornithine decarboxylase attenuates leukemic chemotherapy drugs-induced cell apoptosis and arrest in human promyelocytic HL-60 cells.

doi:10.1016/j.leukres.2008.01.017

中山醫學大學機構典藏 CSMUIR > 醫學院 > 免疫學研究所 > 期刊論文 > Item 310902500/11714

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题名:	Ornithine decarboxylase attenuates leukemic chemotherapy drugs-induced cell apoptosis and arrest in human promyelocytic HL-60 cells.
作者:	Hsu, PC Hung, HC Liao, YF Liu, CC Tsay, GJ Liu, GY
贡献者:	中山醫學大學
关键词:	Ornithine decarboxylase;Cancer chemotherapeutic drug;Apoptosis;Cell cycle
日期:	2008
上传时间:	2015-07-28T05:29:38Z (UTC)
ISSN:	0145-2126
摘要:	Ornithine decarboxylase (ODC), the rate-limiting enzyme of the polyamine biosynthetic pathway, plays an important role in cell cycle, tumor promotion and anti-apoptosis. In our previous studies, overexpression of ODC prevented apoptosis induced by tumor necrosis factor-alpha and methotrexate. We further investigated the apoptotic mechanisms of the cancer chemotherapeutic drugs, including etoposide (VP-16), paclitaxel (TAX) and cisplatin (CDDP), and the influences of ODC on apoptosis and cell cycle. Our results showed that the investigated drugs induced caspase-dependent apoptosis, the generation of reactive oxygen species (ROS) and the disruption of mitochondrial membrane potential (Deltapsi m) in HL-60 cells, all of which were reversed by putrescine, glutathione or N-acetyl-l-cysteine. Overexpression of ODC prevented the cancer chemotherapeutic drugs-induced apoptosis, ROS generation and the disruption of Deltapsi m. After drug administrations, the decline of Bcl-2, cytochrome c release and caspases' activation were inhibited by ODC overexpression. In cell cycle, ODC overexpressed cells seemed to overcome the G1 arrest and G2/M arrest, caused by VP-16 and TAX, respectively, and kept on the cell cycle rolling. Overexpression of ODC increased the expression of Cyclin A, D, E and Cdk4 and the enzyme activity of Cdk1 and Cdk2 after the treatment of VP-16 and TAX, respectively. In conclusions, the cancer chemotherapeutic drugs-induced apoptosis is through ROS-related, mitochondria-mediated and caspase-dependent pathways. With higher ODC activity, cells are resistant to the cancer chemotherapeutic drugs-induced apoptosis and keep on the cell cycle rolling with the significant interference in G1/S arrest caused by VP-16 and G2/M arrest by TAX.
URI:	https://ir.csmu.edu.tw:8080/ir/handle/310902500/11714 http://dx.doi.org/10.1016/j.leukres.2008.01.017
關聯:	Leuk Res. 2008 Oct;32(10):1530-40.
显示于类别:	[免疫學研究所] 期刊論文

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