Research Papers:

A lethal synergy induced by phellinus linteus and camptothecin11 in colon cancer cells

Tianqi Yu, Suthakar Ganapathy, Ling Shen, Bo Peng, Sung-Hoon Kim, Alexandros Makriyannis and Changyan Chen _

PDF  |  HTML  |  How to cite

Oncotarget. 2018; 9:6308-6319. https://doi.org/10.18632/oncotarget.23918

Metrics: PDF 1679 views  |   HTML 2514 views  |   ?  


Tianqi Yu1,*, Suthakar Ganapathy1,*, Ling Shen1, Bo Peng1, Sung-Hoon Kim2, Alexandros Makriyannis1 and Changyan Chen1

1The Center for Drug Discovery, Northeastern University, Boston, MA, USA

2Cancer Molecular Targeted Herbal Research Center, College of Korean Medicine, Kyung Hee University, Seoul, Republic of Korea

*These authors have contributed equally to this work

Correspondence to:

Changyan Chen, email: [email protected]

Keywords: PLGL; CPT11; Chk1; cyclin E; S phase

Received: October 20, 2017    Accepted: December 11, 2017    Published: January 04, 2018


Side effects of anti-cancer drugs are always challenging for effective cancer treatments. The polysaccharides extracted from Phellinus linteus (PLGL) have been widely used in treating cancers. However, the mechanism by which PLGL antagonizes cancerous growth has not been fully investigated. The current study demonstrated that human colon cancer HCT116 and HT29 cells became highly susceptible to cell death when being co-treated with PLGL and low dose of camptothecin11 (CPT11, a topoisomerase inhibitor-based drug), the efficacy of which was comparable as that generated by the high dose of CPT11. However, the co-treatment, unlike high doses of CPT11, was not cytotoxic to the control immortalized colon Caco-2 cells. The co-treatment caused high percentages of the colon cancer cells to accumulate in S phase of the cell cycle, which was also seen in the same cells received the high dose of CPT11 treatment. Chk1 was phosphorylated, and then rapidly degraded in the cancer cells treated with the high dose of CPT11 or co-treatment, but not in the cells treated with PLGL alone or low doses of CPT11. PLGL appeared enhancing CPT11 inhibitory effect on topoisomerase, and Chk1 degradatopm in the cancer cells. Furthermore, cyclin E (clnE) became unstable at the transcription level in co-treated or PLGL-treated colon cancer cells. The data suggested that PLGL functions in two ways to achieve its lethal synergy with CPT11 in colon cancer cells. Our findings are of potential significance as PLGL represents a promising medicine for overcoming the side effects of CPT11 and perhaps also for improving other CPTs-based regimens.

Creative Commons License All site content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 License.
PII: 23918