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Article Open Access

Cetuximab improves AZD6244 antitumor activity in colorectal cancer HT29 cells in vitro and in nude mice by attenuating HER3/Akt pathway activation

  • Authors:
    • Qin Zhang
    • He Xiao
    • Feng Jin
    • Mengxia Li
    • Jia Luo
    • Ge Wang
  • View Affiliations / Copyright

    Affiliations: Cancer Center, Research Institute of Surgery, Daping Hospital, The Third Military Medical University, Chongqing 400042, P.R. China
    Copyright: © Zhang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 326-334
    |
    Published online on: May 9, 2018
       https://doi.org/10.3892/ol.2018.8674
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Abstract

The present study investigated the molecular mechanism by which the epidermal growth factor receptor (EGFR) inhibitor cetuximab enhances the antitumor activity of the mitogen‑activated protein kinase kinase (MEK) inhibitor AZD6244 in colorectal cancer HT29 cells. HT29 cells were treated with AZD6244 plus cetuximab and then subjected to the following assays: Cell Counting kit‑8, BrdU‑incorporation, flow cytometric cell cycle distribution and apoptosis analysis, western blot analysis, and nude mouse xenografts. The combination of AZD6244 and cetuximab significantly reduced HT29 cell viability and proliferation compared with AZD6244 alone. The combination treatment reduced the IC50 value from 108.12±10.05 to 28.45±1.92 nM. AZD6244 and cetuximab also induced cell cycle arrest at G1 phase and reduced S phase (88.53% vs. 93.39%, P=0.080; 8.73% vs. 4.24%, P=0.082, respectively). Combination of AZD6244 with cetuximab significantly induced tumor cells apoptosis (14.61% vs. 8.99%, P=0.046). Inhibition of EGFR activity using cetuximab partially abrogated the feedback‑activation of phosphorylated receptor tyrosine‑protein kinase erB‑3 (p‑HER3) and p‑AKT serine/threonine kinase (AKT), as well as prevented reactivation of p‑extracellular regulated kinase (ERK) conferred by AZD6244 treatment. Combination of AZD6244 and cetuximab also inhibited HT29 cell xenograft growth in nude mice and suppressed HER3 and p‑AKT levels in xenografts. The EGFR inhibitor cetuximab enhanced the antitumor activity of the MEK inhibitor AZD6244 in colorectal cells in vitro and in vivo. Co‑inhibition of MEK and EGFR may be a promising treatment strategy in colorectal cancers.
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Copy and paste a formatted citation
Spandidos Publications style
Zhang Q, Xiao H, Jin F, Li M, Luo J and Wang G: Cetuximab improves AZD6244 antitumor activity in colorectal cancer HT29 cells in vitro and in nude mice by attenuating HER3/Akt pathway activation. Oncol Lett 16: 326-334, 2018.
APA
Zhang, Q., Xiao, H., Jin, F., Li, M., Luo, J., & Wang, G. (2018). Cetuximab improves AZD6244 antitumor activity in colorectal cancer HT29 cells in vitro and in nude mice by attenuating HER3/Akt pathway activation. Oncology Letters, 16, 326-334. https://doi.org/10.3892/ol.2018.8674
MLA
Zhang, Q., Xiao, H., Jin, F., Li, M., Luo, J., Wang, G."Cetuximab improves AZD6244 antitumor activity in colorectal cancer HT29 cells in vitro and in nude mice by attenuating HER3/Akt pathway activation". Oncology Letters 16.1 (2018): 326-334.
Chicago
Zhang, Q., Xiao, H., Jin, F., Li, M., Luo, J., Wang, G."Cetuximab improves AZD6244 antitumor activity in colorectal cancer HT29 cells in vitro and in nude mice by attenuating HER3/Akt pathway activation". Oncology Letters 16, no. 1 (2018): 326-334. https://doi.org/10.3892/ol.2018.8674
Copy and paste a formatted citation
x
Spandidos Publications style
Zhang Q, Xiao H, Jin F, Li M, Luo J and Wang G: Cetuximab improves AZD6244 antitumor activity in colorectal cancer HT29 cells in vitro and in nude mice by attenuating HER3/Akt pathway activation. Oncol Lett 16: 326-334, 2018.
APA
Zhang, Q., Xiao, H., Jin, F., Li, M., Luo, J., & Wang, G. (2018). Cetuximab improves AZD6244 antitumor activity in colorectal cancer HT29 cells in vitro and in nude mice by attenuating HER3/Akt pathway activation. Oncology Letters, 16, 326-334. https://doi.org/10.3892/ol.2018.8674
MLA
Zhang, Q., Xiao, H., Jin, F., Li, M., Luo, J., Wang, G."Cetuximab improves AZD6244 antitumor activity in colorectal cancer HT29 cells in vitro and in nude mice by attenuating HER3/Akt pathway activation". Oncology Letters 16.1 (2018): 326-334.
Chicago
Zhang, Q., Xiao, H., Jin, F., Li, M., Luo, J., Wang, G."Cetuximab improves AZD6244 antitumor activity in colorectal cancer HT29 cells in vitro and in nude mice by attenuating HER3/Akt pathway activation". Oncology Letters 16, no. 1 (2018): 326-334. https://doi.org/10.3892/ol.2018.8674
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