Costunolide causes mitotic arrest and enhances radiosensitivity in human hepatocellular carcinoma cells
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- 作者：Chia-Yuan Liu (1) (3)
Hsun-Shuo Chang (5)
Ih-Sheng Chen (5)
Chih-Jen Chen (3)
Ming-Ling Hsu (2)
Shu-Ling Fu (1)
Yu-Jen Chen (1) (2) (4) - 刊名：Radiation Oncology
- 出版年：2011
- 出版时间：December 2011
- 年：2011
- 卷：6
- 期：1
- 全文大小：2510KB
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Hsun-Shuo Chang (5)
Ih-Sheng Chen (5)
Chih-Jen Chen (3)
Ming-Ling Hsu (2)
Shu-Ling Fu (1)
Yu-Jen Chen (1) (2) (4)
1. Institute of Traditional Medicine, National Yang-Ming University, Taipei, Taiwan
3. Section of Gastroenterology, Department of Internal Medicine, Mackay Memorial Hospital, Taipei, Taiwan
5. Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan
2. Department of Medical Research, Mackay Memorial Hospital, Taipei, Taiwan
4. Department of Radiation Oncology, Mackay Memorial Hospital, Taipei, Taiwan
文摘
Purpose This work aimed to investigate the effect of costunolide, a sesquiterpene lactone isolated from Michelia compressa, on cell cycle distribution and radiosensitivity of human hepatocellular carcinoma (HCC) cells. Methods The assessment used in this study included: cell viability assay, cell cycle analysis by DNA histogram, expression of phosphorylated histone H3 (Ser 10) by flow cytometer, mitotic index by Liu's stain and morphological observation, mitotic spindle alignment by immunofluorescence of alpha-tubulin, expression of cell cycle-related proteins by Western blotting, and radiation survival by clonogenic assay. Results Our results show that costunolide reduced the viability of HA22T/VGH cells. It caused a rapid G2/M arrest at 4 hours shown by DNA histogram. The increase in phosphorylated histone H3 (Ser 10)-positive cells and mitotic index indicates costunolide-treated cells are arrested at mitosis, not G2, phase. Immunofluorescence of alpha-tubulin for spindle formation further demonstrated these cells are halted at metaphase. Costunolide up-regulated the expression of phosphorylated Chk2 (Thr 68), phosphorylated Cdc25c (Ser 216), phosphorylated Cdk1 (Tyr 15) and cyclin B1 in HA22T/VGH cells. At optimal condition causing mitotic arrest, costunolide sensitized HA22T/VGH HCC cells to ionizing radiation with sensitizer enhancement ratio up to 1.9. Conclusions Costunolide could reduce the viability and arrest cell cycling at mitosis in hepatoma cells. Logical exploration of this mitosis-arresting activity for cancer therapeutics shows costunolide enhanced the killing effect of radiotherapy against human HCC cells.