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Valproic acid inhibits proliferation of HER2-expressing breast cancer cells by inducing cell cycle arrest and apoptosis through Hsp70 acetylation

  • Authors:
    • Toshiki Mawatari
    • Itasu Ninomiya
    • Masafumi Inokuchi
    • Shinichi Harada
    • Hironori Hayashi
    • Katsunobu Oyama
    • Isamu Makino
    • Hisatoshi Nakagawara
    • Tomoharu Miyashita
    • Hidehiro Tajima
    • Hiroyuki Takamura
    • Sachio Fushida
    • Tetsuo Ohta
  • View Affiliations / Copyright

    Affiliations: Gastroenterologic Surgery, Division of Cancer Medicine, Graduate School of Medical Science, Kanazawa University, Kanazawa, Japan, Breast Oncology, Division of Cancer Medicine, Graduate School of Medical Science, Kanazawa University, Kanazawa, Japan, Center for Biomedical Research and Education, Graduate School of Medical Science, Kanazawa University, Kanazawa, Japan
    Copyright: © Mawatari et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 2073-2081
    |
    Published online on: October 20, 2015
       https://doi.org/10.3892/ijo.2015.3213
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Abstract

Breast cancer encompasses a heterogeneous group of diseases at the molecular level. It is known that chemosensitivity of breast cancer depends on its molecular subtype. We investigated the growth inhibitory effect of valproic acid (VPA), a histone deacetylase (HDAC) inhibitor, and the mechanism of this inhibition on four breast cancer cell lines with different molecular subtypes. The growth inhibitory effect of VPA in the four different breast cancer cell lines was investigated. The alteration of levels of p21 WAF1, cleaved caspase-3, acetylated Heat shock protein (Hsp) 90, acetylated Hsp70, and acetylated α-tubulin by VPA was examined in VPA-sensitive, human epidermal receptor 2 (HER2)-overexpressing SKBR3 cells. The cell growth inhibition of breast cancer cell lines was dependent on the dose and exposure time of VPA. The cell growth of HER2-overexpressing SKBR3 cell line was inhibited by VPA to a much greater degree than other cell lines studied. In SKBR3 cell line, VPA upregulated expression of p21 WAF1 and cleaved caspase-3 in the early phase. VPA markedly increased Hsp70 acetylation in a time-dependent manner but did not increase Hsp90 acetylation. Our data demonstrated that VPA inhibited cell proliferation and induced cell cycle arrest and apoptosis of HER2-overexpressing breast cancer cells. This anti-proliferation effect might be the direct function of VPA as an HDAC inhibitor. We propose an alternative mechanism whereby acetylation of Hsp70 disrupts the function of Hsp90 and leads to downregulation of its client proteins, including HER2 that might be the indirect function of VPA, in the sense that non-histone proteins are acetylated.
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Copy and paste a formatted citation
Spandidos Publications style
Mawatari T, Ninomiya I, Inokuchi M, Harada S, Hayashi H, Oyama K, Makino I, Nakagawara H, Miyashita T, Tajima H, Tajima H, et al: Valproic acid inhibits proliferation of HER2-expressing breast cancer cells by inducing cell cycle arrest and apoptosis through Hsp70 acetylation. Int J Oncol 47: 2073-2081, 2015.
APA
Mawatari, T., Ninomiya, I., Inokuchi, M., Harada, S., Hayashi, H., Oyama, K. ... Ohta, T. (2015). Valproic acid inhibits proliferation of HER2-expressing breast cancer cells by inducing cell cycle arrest and apoptosis through Hsp70 acetylation. International Journal of Oncology, 47, 2073-2081. https://doi.org/10.3892/ijo.2015.3213
MLA
Mawatari, T., Ninomiya, I., Inokuchi, M., Harada, S., Hayashi, H., Oyama, K., Makino, I., Nakagawara, H., Miyashita, T., Tajima, H., Takamura, H., Fushida, S., Ohta, T."Valproic acid inhibits proliferation of HER2-expressing breast cancer cells by inducing cell cycle arrest and apoptosis through Hsp70 acetylation". International Journal of Oncology 47.6 (2015): 2073-2081.
Chicago
Mawatari, T., Ninomiya, I., Inokuchi, M., Harada, S., Hayashi, H., Oyama, K., Makino, I., Nakagawara, H., Miyashita, T., Tajima, H., Takamura, H., Fushida, S., Ohta, T."Valproic acid inhibits proliferation of HER2-expressing breast cancer cells by inducing cell cycle arrest and apoptosis through Hsp70 acetylation". International Journal of Oncology 47, no. 6 (2015): 2073-2081. https://doi.org/10.3892/ijo.2015.3213
Copy and paste a formatted citation
x
Spandidos Publications style
Mawatari T, Ninomiya I, Inokuchi M, Harada S, Hayashi H, Oyama K, Makino I, Nakagawara H, Miyashita T, Tajima H, Tajima H, et al: Valproic acid inhibits proliferation of HER2-expressing breast cancer cells by inducing cell cycle arrest and apoptosis through Hsp70 acetylation. Int J Oncol 47: 2073-2081, 2015.
APA
Mawatari, T., Ninomiya, I., Inokuchi, M., Harada, S., Hayashi, H., Oyama, K. ... Ohta, T. (2015). Valproic acid inhibits proliferation of HER2-expressing breast cancer cells by inducing cell cycle arrest and apoptosis through Hsp70 acetylation. International Journal of Oncology, 47, 2073-2081. https://doi.org/10.3892/ijo.2015.3213
MLA
Mawatari, T., Ninomiya, I., Inokuchi, M., Harada, S., Hayashi, H., Oyama, K., Makino, I., Nakagawara, H., Miyashita, T., Tajima, H., Takamura, H., Fushida, S., Ohta, T."Valproic acid inhibits proliferation of HER2-expressing breast cancer cells by inducing cell cycle arrest and apoptosis through Hsp70 acetylation". International Journal of Oncology 47.6 (2015): 2073-2081.
Chicago
Mawatari, T., Ninomiya, I., Inokuchi, M., Harada, S., Hayashi, H., Oyama, K., Makino, I., Nakagawara, H., Miyashita, T., Tajima, H., Takamura, H., Fushida, S., Ohta, T."Valproic acid inhibits proliferation of HER2-expressing breast cancer cells by inducing cell cycle arrest and apoptosis through Hsp70 acetylation". International Journal of Oncology 47, no. 6 (2015): 2073-2081. https://doi.org/10.3892/ijo.2015.3213
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