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20(s)-Protopanaxadiol (PPD) increase the radiotherapy sensitivity of laryngeal carcinoma


Laryngeal carcinoma (LC) is one of the most prevalent malignant tumors in the head and neck area. Due to its high morbidity and mortality, LC has posed a serious threat to human life and health. Even with surgical removal, some patients were not sensitive to radiotherapy or appeared transfer or recurrence. 20(s)-Protopanaxadiol (PPD), a natural product from Panax ginseng, has been reported to have cytotoxicity effect against several cancer cell lines. However, whether it can improve the radiation sensitivity and the underlining mechanism of PPD’s sensitization effect are still unknown. Herein, by in vitro and in vivo experiments, we found that the combination of PPD and radiation not only significantly inhibited proliferation, induced apoptosis, but also suppressed the tumor growth in mouse models. These findings confirmed the role of PPD in enhancing the sensitivity of radiotherapy. Moreover, our work showed that the expression levels of mTOR and its downstream effectors dramatically decreased after PPD addition when compared to radiation only. This result suggested that the PPD’s excellent synergistic effects with radiation might be associated with down-regulation of mTOR signaling pathway in Hep-2 cells.

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Publication details

The article was received on 11 Jun 2017, accepted on 05 Oct 2017 and first published on 10 Oct 2017

Article type: Paper
DOI: 10.1039/C7FO00853H
Citation: Food Funct., 2017, Accepted Manuscript
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    20(s)-Protopanaxadiol (PPD) increase the radiotherapy sensitivity of laryngeal carcinoma

    B. Teng, L. Zhao, J. gao, P. He, H. Li, J. Chen, Q. Feng and C. Yi, Food Funct., 2017, Accepted Manuscript , DOI: 10.1039/C7FO00853H

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