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Article

Gemcitabine treatment enhances HER2 expression in low HER2-expressing breast cancer cells and enhances the antitumor effects of trastuzumab emtansine

  • Authors:
    • Shin Kan
    • Shigeo Koido
    • Masato Okamoto
    • Kazumi Hayashi
    • Masaki Ito
    • Yuko Kamata
    • Hideo Komita
    • Takefumi Ishidao
    • Eijiro Nagasaki
    • Sadamu Homma
  • View Affiliations / Copyright

    Affiliations: Division of Oncology, Research Center for Medical Sciences, Jikei University School of Medicine, Tokyo, Japan, Department of Advanced Immunotherapeutics, Kitasato University School of Pharmacy, Tokyo, Japan, Shimbashi Medical Checkup Office, Jikei University Hospital, Tokyo, Japan, Tella, Inc., Tokyo, Japan
  • Pages: 504-510
    |
    Published online on: May 12, 2015
       https://doi.org/10.3892/or.2015.3974
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Abstract

Trastuzumab emtansine (T-DM1), trastuzumab-conjugated with a cytotoxic agent, has shown promising antitumor effects in breast cancer. Since a good therapeutic response using T-DM1 treatment requires high human epidermal growth factor receptor 2 (HER2) expression, breast cancers with low or no HER2 expression have not been used for T-DM1 treatment. The aim of the present study was to show that treatment of low HER2-expressing breast cancer cells with gemcitabine (GEM) enhanced HER2 expression using RT-qPCR, immunoblot and flow cytometric analysis. The results showed that GEM treatment significantly enhanced HER2 expression in MDA-MB-231, MCF7 and BT-20 breast cancer cells, while paclitaxel (PTX) treatment induced lower or no enhancement in HER2 expression. The expression of HER2 mRNA was also enhanced in GEM-treated MCF7 cells. Treatment with an inhibitor for nuclear factor-(NF)-κB suppressed GEM-induced HER2 upregulation, indicating that NF-κB activation by GEM may be associated with HER2 upregulation. T-DM1 binding to HER2 on MCF-7 cells was enhanced by GEM pretreatment and the combined treatment of GEM and T-DM1 synergistically inhibited the proliferation of MCF7 cells. Thus, the combined treatment with GEM and T-DM1 may be a promising therapeutic modality for low HER2‑expressing breast cancers, which was facilitated by the unique HER2-upregulating effect of GEM.
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Copy and paste a formatted citation
Spandidos Publications style
Kan S, Koido S, Okamoto M, Hayashi K, Ito M, Kamata Y, Komita H, Ishidao T, Nagasaki E, Homma S, Homma S, et al: Gemcitabine treatment enhances HER2 expression in low HER2-expressing breast cancer cells and enhances the antitumor effects of trastuzumab emtansine. Oncol Rep 34: 504-510, 2015.
APA
Kan, S., Koido, S., Okamoto, M., Hayashi, K., Ito, M., Kamata, Y. ... Homma, S. (2015). Gemcitabine treatment enhances HER2 expression in low HER2-expressing breast cancer cells and enhances the antitumor effects of trastuzumab emtansine. Oncology Reports, 34, 504-510. https://doi.org/10.3892/or.2015.3974
MLA
Kan, S., Koido, S., Okamoto, M., Hayashi, K., Ito, M., Kamata, Y., Komita, H., Ishidao, T., Nagasaki, E., Homma, S."Gemcitabine treatment enhances HER2 expression in low HER2-expressing breast cancer cells and enhances the antitumor effects of trastuzumab emtansine". Oncology Reports 34.1 (2015): 504-510.
Chicago
Kan, S., Koido, S., Okamoto, M., Hayashi, K., Ito, M., Kamata, Y., Komita, H., Ishidao, T., Nagasaki, E., Homma, S."Gemcitabine treatment enhances HER2 expression in low HER2-expressing breast cancer cells and enhances the antitumor effects of trastuzumab emtansine". Oncology Reports 34, no. 1 (2015): 504-510. https://doi.org/10.3892/or.2015.3974
Copy and paste a formatted citation
x
Spandidos Publications style
Kan S, Koido S, Okamoto M, Hayashi K, Ito M, Kamata Y, Komita H, Ishidao T, Nagasaki E, Homma S, Homma S, et al: Gemcitabine treatment enhances HER2 expression in low HER2-expressing breast cancer cells and enhances the antitumor effects of trastuzumab emtansine. Oncol Rep 34: 504-510, 2015.
APA
Kan, S., Koido, S., Okamoto, M., Hayashi, K., Ito, M., Kamata, Y. ... Homma, S. (2015). Gemcitabine treatment enhances HER2 expression in low HER2-expressing breast cancer cells and enhances the antitumor effects of trastuzumab emtansine. Oncology Reports, 34, 504-510. https://doi.org/10.3892/or.2015.3974
MLA
Kan, S., Koido, S., Okamoto, M., Hayashi, K., Ito, M., Kamata, Y., Komita, H., Ishidao, T., Nagasaki, E., Homma, S."Gemcitabine treatment enhances HER2 expression in low HER2-expressing breast cancer cells and enhances the antitumor effects of trastuzumab emtansine". Oncology Reports 34.1 (2015): 504-510.
Chicago
Kan, S., Koido, S., Okamoto, M., Hayashi, K., Ito, M., Kamata, Y., Komita, H., Ishidao, T., Nagasaki, E., Homma, S."Gemcitabine treatment enhances HER2 expression in low HER2-expressing breast cancer cells and enhances the antitumor effects of trastuzumab emtansine". Oncology Reports 34, no. 1 (2015): 504-510. https://doi.org/10.3892/or.2015.3974
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