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Article

Tumor suppressor REIC/Dkk‑3 and its interacting protein SGTA inhibit glucocorticoid receptor to nuclear transport

  • Authors:
    • Takehiro Iwata
    • Takuya Sadahira
    • Kazuhiko Ochiai
    • Hideo Ueki
    • Takanori Sasaki
    • Peng Haung
    • Motoo Araki
    • Toyohiko Watanabe
    • Yasutomo Nasu
    • Masami Watanabe
  • View Affiliations / Copyright

    Affiliations: Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700‑8558, Japan, School of Veterinary Nursing and Technology, Faculty of Veterinary Science, Nippon Veterinary and Life Science University, Tokyo 180‑8602, Collaborative Research Center for Okayama Medical Innovation Center (OMIC), Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700‑8558, Japan
  • Pages: 1739-1745
    |
    Published online on: May 29, 2020
       https://doi.org/10.3892/etm.2020.8819
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Abstract

REIC/Dkk‑3 is a tumor suppressor, and its expression is significantly downregulated in a variety of human cancer types. A previous study performed yeast two‑hybrid screening and identified the small glutamine‑rich tetratricopeptide repeat‑containing protein α (SGTA), known as a negative modulator of cytoplasmic androgen receptor (AR) signaling, which is a novel interacting partner of REIC/Dkk‑3. The previous study also indicated that the REIC/Dkk‑3 protein interferes with the dimerization of SGTA and then upregulates the AR transport and signaling in human prostate cancer PC3 cells. Since the transport of some steroid receptors to nucleus is conducted similarly by dynein motor‑dependent way, the current study aimed to investigate the role of SGTA and REIC/Dkk‑3 in the transport of other glucocorticoid receptors (GR). In vitro reporter assays for the cytoplasmic GR transport were performed in human prostate cancer PC3 cells and 293T cells. As for the SGTA protein, a suppressive effect on the GR transport to the nucleus was observed in the cells. As for the REIC/Dkk‑3 protein, an inhibitory effect was observed for the GR transport in PC3 cells. Under the depleted condition of SGTA by short‑hairpin (sh)RNA, the downregulation of GR transport by REIC/Dkk‑3 was significantly enhanced compared with the non‑depleted condition in PC3 cells, suggesting a compensatory role of REIC/Dkk‑3 in the SGTA mediated inhibition of GR transport. The current study therefore demonstrated that SGTA inhibited the cytoplasmic transport of GR in 293T and PC3 cells, and REIC/Dkk‑3 also inhibited the cytoplasmic transport of GR in PC3 cells. These results may be used to gain novel insight into the GR transport and signaling in normal and cancer cells.
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Copy and paste a formatted citation
Spandidos Publications style
Iwata T, Sadahira T, Ochiai K, Ueki H, Sasaki T, Haung P, Araki M, Watanabe T, Nasu Y, Watanabe M, Watanabe M, et al: Tumor suppressor REIC/Dkk‑3 and its interacting protein SGTA inhibit glucocorticoid receptor to nuclear transport. Exp Ther Med 20: 1739-1745, 2020.
APA
Iwata, T., Sadahira, T., Ochiai, K., Ueki, H., Sasaki, T., Haung, P. ... Watanabe, M. (2020). Tumor suppressor REIC/Dkk‑3 and its interacting protein SGTA inhibit glucocorticoid receptor to nuclear transport. Experimental and Therapeutic Medicine, 20, 1739-1745. https://doi.org/10.3892/etm.2020.8819
MLA
Iwata, T., Sadahira, T., Ochiai, K., Ueki, H., Sasaki, T., Haung, P., Araki, M., Watanabe, T., Nasu, Y., Watanabe, M."Tumor suppressor REIC/Dkk‑3 and its interacting protein SGTA inhibit glucocorticoid receptor to nuclear transport". Experimental and Therapeutic Medicine 20.2 (2020): 1739-1745.
Chicago
Iwata, T., Sadahira, T., Ochiai, K., Ueki, H., Sasaki, T., Haung, P., Araki, M., Watanabe, T., Nasu, Y., Watanabe, M."Tumor suppressor REIC/Dkk‑3 and its interacting protein SGTA inhibit glucocorticoid receptor to nuclear transport". Experimental and Therapeutic Medicine 20, no. 2 (2020): 1739-1745. https://doi.org/10.3892/etm.2020.8819
Copy and paste a formatted citation
x
Spandidos Publications style
Iwata T, Sadahira T, Ochiai K, Ueki H, Sasaki T, Haung P, Araki M, Watanabe T, Nasu Y, Watanabe M, Watanabe M, et al: Tumor suppressor REIC/Dkk‑3 and its interacting protein SGTA inhibit glucocorticoid receptor to nuclear transport. Exp Ther Med 20: 1739-1745, 2020.
APA
Iwata, T., Sadahira, T., Ochiai, K., Ueki, H., Sasaki, T., Haung, P. ... Watanabe, M. (2020). Tumor suppressor REIC/Dkk‑3 and its interacting protein SGTA inhibit glucocorticoid receptor to nuclear transport. Experimental and Therapeutic Medicine, 20, 1739-1745. https://doi.org/10.3892/etm.2020.8819
MLA
Iwata, T., Sadahira, T., Ochiai, K., Ueki, H., Sasaki, T., Haung, P., Araki, M., Watanabe, T., Nasu, Y., Watanabe, M."Tumor suppressor REIC/Dkk‑3 and its interacting protein SGTA inhibit glucocorticoid receptor to nuclear transport". Experimental and Therapeutic Medicine 20.2 (2020): 1739-1745.
Chicago
Iwata, T., Sadahira, T., Ochiai, K., Ueki, H., Sasaki, T., Haung, P., Araki, M., Watanabe, T., Nasu, Y., Watanabe, M."Tumor suppressor REIC/Dkk‑3 and its interacting protein SGTA inhibit glucocorticoid receptor to nuclear transport". Experimental and Therapeutic Medicine 20, no. 2 (2020): 1739-1745. https://doi.org/10.3892/etm.2020.8819
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