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Article

Cetuximab-induced insulin-like growth factor receptor I activation mediates cetuximab resistance in gastric cancer cells

  • Authors:
    • Xin Li
    • Ling Xu
    • Heming Li
    • Lei Zhao
    • Ying Luo
    • Zhitu Zhu
    • Yunpeng Liu
    • Xiujuan Qu
  • View Affiliations / Copyright

    Affiliations: Department of Medical Oncology, The First Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China, Department of Medical Oncology, The First Affiliated Hospital of Liaoning Medical University, Jinzhou, Liaoning 121001, P.R. China
  • Pages: 4547-4554
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    Published online on: January 23, 2015
       https://doi.org/10.3892/mmr.2015.3245
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Abstract

Epidermal growth factor receptor (EGFR) and insulin‑like growth factor receptor‑I (IGF‑IR) are frequently overexpressed in gastric cancer cells. However, these cells are resistant to the anti‑EGFR monoclonal antibody cetuximab. The aim of the present study was to determine whether cetuximab resistance in gastric cancer cells resulted from activation of the IGF‑IR signaling pathway by cetuximab. The results demonstrated that EGFR phosphorylation was markedly inhibited in gastric cancer cell lines (SGC7901 and MGC803) which possessed functional K‑ras and BRAF following treatment with cetuximab. However, cetuximab treatment did not diminish cell viability; by contrast, IGF‑IR activation was observed. Knockdown of IGF‑IR or the use of an IGF‑IR inhibitor were found to increase the sensitivity of gastric cancer cells to cetuximab. Furthermore, cetuximab induced phosphorylation of the non‑receptor tyrosine kinase c‑steroid receptor co‑activator (Src). Treatment of gastric cancer cells with a Src inhibitor was shown to significantly reduce cetuximab‑induced phosphorylation of IGF‑IR as well as Src, which resulted in enhanced sensitivity to cetuximab treatment. In conclusion, the results of the present study demonstrated that cetuximab‑induced IGF‑IR activation was involved in cetuximab resistance in gastric cancer cells and that Src was an important mediator for IGF‑IR activation.
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Copy and paste a formatted citation
Spandidos Publications style
Li X, Xu L, Li H, Zhao L, Luo Y, Zhu Z, Liu Y and Qu X: Cetuximab-induced insulin-like growth factor receptor I activation mediates cetuximab resistance in gastric cancer cells. Mol Med Rep 11: 4547-4554, 2015.
APA
Li, X., Xu, L., Li, H., Zhao, L., Luo, Y., Zhu, Z. ... Qu, X. (2015). Cetuximab-induced insulin-like growth factor receptor I activation mediates cetuximab resistance in gastric cancer cells. Molecular Medicine Reports, 11, 4547-4554. https://doi.org/10.3892/mmr.2015.3245
MLA
Li, X., Xu, L., Li, H., Zhao, L., Luo, Y., Zhu, Z., Liu, Y., Qu, X."Cetuximab-induced insulin-like growth factor receptor I activation mediates cetuximab resistance in gastric cancer cells". Molecular Medicine Reports 11.6 (2015): 4547-4554.
Chicago
Li, X., Xu, L., Li, H., Zhao, L., Luo, Y., Zhu, Z., Liu, Y., Qu, X."Cetuximab-induced insulin-like growth factor receptor I activation mediates cetuximab resistance in gastric cancer cells". Molecular Medicine Reports 11, no. 6 (2015): 4547-4554. https://doi.org/10.3892/mmr.2015.3245
Copy and paste a formatted citation
x
Spandidos Publications style
Li X, Xu L, Li H, Zhao L, Luo Y, Zhu Z, Liu Y and Qu X: Cetuximab-induced insulin-like growth factor receptor I activation mediates cetuximab resistance in gastric cancer cells. Mol Med Rep 11: 4547-4554, 2015.
APA
Li, X., Xu, L., Li, H., Zhao, L., Luo, Y., Zhu, Z. ... Qu, X. (2015). Cetuximab-induced insulin-like growth factor receptor I activation mediates cetuximab resistance in gastric cancer cells. Molecular Medicine Reports, 11, 4547-4554. https://doi.org/10.3892/mmr.2015.3245
MLA
Li, X., Xu, L., Li, H., Zhao, L., Luo, Y., Zhu, Z., Liu, Y., Qu, X."Cetuximab-induced insulin-like growth factor receptor I activation mediates cetuximab resistance in gastric cancer cells". Molecular Medicine Reports 11.6 (2015): 4547-4554.
Chicago
Li, X., Xu, L., Li, H., Zhao, L., Luo, Y., Zhu, Z., Liu, Y., Qu, X."Cetuximab-induced insulin-like growth factor receptor I activation mediates cetuximab resistance in gastric cancer cells". Molecular Medicine Reports 11, no. 6 (2015): 4547-4554. https://doi.org/10.3892/mmr.2015.3245
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