Format

Send to

Choose Destination
Cancer Lett. 2012 Jun 28;319(2):203-213. doi: 10.1016/j.canlet.2012.01.006. Epub 2012 Feb 1.

Synergistic anticancer activity of triptolide combined with cisplatin enhances apoptosis in gastric cancer in vitro and in vivo.

Author information

1
Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan. Electronic address: 97751101@stmail.tcu.edu.tw.
2
Department of Life Sciences, Tzu Chi University, Hualien, Taiwan. Electronic address: chingyu@mail.tcu.edu.tw.
3
School of Medicine, Institute of Traditional Medicine, National Yang-Ming University, Taipei, Taiwan. Electronic address: yg1236@yahoo.com.tw.
4
Department of Life Sciences, Tzu Chi University, Hualien, Taiwan. Electronic address: wangmh@mail.tcu.edu.tw.
5
Department of Pathology, Buddhist Tzu Chi General Hospital Taichung Branch, Taichung, Taiwan. Electronic address: laifakimo@yahoo.com.tw.
6
Department of Family Medicine, Tzu Chi University, Hualien, Taiwan; Department of Family Medicine, Buddhist Tzu Chi General Hospital, Hualien, Taiwan. Electronic address: jihiyeh@mail.tcu.edu.tw.
7
Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan; Department of Life Sciences, Tzu Chi University, Hualien, Taiwan. Electronic address: hsueyin@mail.tcu.edu.tw.

Abstract

Cisplatin is an anticancer agent that is effective against several types of cancer, including gastric cancer. However, its therapeutic application is limited by its toxicity in normal tissues and complications caused in patients. In this study, we attempted to clarify how triptolide, an active component extracted from the traditional Chinese herbal medicine Tripterygium wilfordii Hook F (TWHF), enhances cisplatin-induced cytotoxicity in gastric cancer SC-M1 cells. After low-dose combined treatments with triptolide and cisplatin, a decrease in viability with a concomitant increase in apoptosis was observed in SC-M1 cells but not in normal cells. Apoptosis induced by the combined treatments was accompanied by loss of mitochondrial membrane potential and release of cytochrome c. Triptolide increased the cisplatin-induced activation of caspase-3 and caspase-9 and the downstream cleavage of PARP in SC-M1 cells. Results of these in vitro experiments indicated that triptolide enhanced cytotoxicity in cisplatin-treated SC-M1 cells and that this effect is mediated by apoptosis through a mitochondrial pathway. Furthermore, using a SCID mouse xenograft model, we demonstrated that the combined treatment completely suppressed tumor growth via down-regulation of proliferating cell nuclear antigen expression without significant side effects. These results suggest that lower concentrations of cisplatin and triptolide used in combination may produce a synergistic anticancer effect that warrants further investigation for its potential clinical applications.

PMID:
22306340
DOI:
10.1016/j.canlet.2012.01.006
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center