Combined oridonin with cetuximab treatment shows synergistic anticancer effects on laryngeal squamous cell carcinoma: involvement of inhibition of EGFR and activation of reactive oxygen species-mediated JNK pathway

  • Authors:
    • Shijie Cao
    • Meijuan Xia
    • Yiwei Mao
    • Qiang Zhang
    • Paul Owusu Donkor
    • Feng Qiu
    • Ning Kang
  • View Affiliations

  • Published online on: September 19, 2016     https://doi.org/10.3892/ijo.2016.3696
  • Pages: 2075-2087
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Abstract

Epidermal growth factor receptor (EGFR), a transmembrane glycoprotein, is expressed at high levels in a large proportion of laryngeal squamous cell carcinoma (LSCC). Cetuximab (Cet), an anti-EGFR monoclonal antibody, has limited clinical outcome for patients with head and neck squamous cell carcinoma. Our previous studies showed that oridonin (ORI), a natural and safe kaurene diterpenoid isolated from Rabdosia rubescens, inhibited cell growth in HEp-2 cells through inhibition of EGFR phosphorylation. The aim of the present study was to determine whether ORI could improve the anticancer efficacy of Cet on LSCC. We observed that the combination with Cet and ORI synergistically inhibited cell growth associated with Fas-mediated apoptosis and G2/M phase arrest in two LSCC cell lines (HEp-2 and Tu212 cells). Moreover, combination treatment caused cell death associated with suppression of p-EGFR and activation of reactive oxygen species (ROS)-mediated JNK pathway. In nude mice bearing HEp-2 xenografts, ORI plus Cet caused a significant tumor regression through induction of apoptosis and inhibition of proliferation with no side-effect. Together, our findings suggest that the combination of ORI and Cet has the potential to enhance tumor responses and may significantly improve therapeutic outcomes in LSCC.
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November-2016
Volume 49 Issue 5

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Cao S, Xia M, Mao Y, Zhang Q, Donkor PO, Qiu F and Kang N: Combined oridonin with cetuximab treatment shows synergistic anticancer effects on laryngeal squamous cell carcinoma: involvement of inhibition of EGFR and activation of reactive oxygen species-mediated JNK pathway. Int J Oncol 49: 2075-2087, 2016
APA
Cao, S., Xia, M., Mao, Y., Zhang, Q., Donkor, P.O., Qiu, F., & Kang, N. (2016). Combined oridonin with cetuximab treatment shows synergistic anticancer effects on laryngeal squamous cell carcinoma: involvement of inhibition of EGFR and activation of reactive oxygen species-mediated JNK pathway. International Journal of Oncology, 49, 2075-2087. https://doi.org/10.3892/ijo.2016.3696
MLA
Cao, S., Xia, M., Mao, Y., Zhang, Q., Donkor, P. O., Qiu, F., Kang, N."Combined oridonin with cetuximab treatment shows synergistic anticancer effects on laryngeal squamous cell carcinoma: involvement of inhibition of EGFR and activation of reactive oxygen species-mediated JNK pathway". International Journal of Oncology 49.5 (2016): 2075-2087.
Chicago
Cao, S., Xia, M., Mao, Y., Zhang, Q., Donkor, P. O., Qiu, F., Kang, N."Combined oridonin with cetuximab treatment shows synergistic anticancer effects on laryngeal squamous cell carcinoma: involvement of inhibition of EGFR and activation of reactive oxygen species-mediated JNK pathway". International Journal of Oncology 49, no. 5 (2016): 2075-2087. https://doi.org/10.3892/ijo.2016.3696