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Article Open Access

NLS‑RARα is a novel transcriptional factor

  • Authors:
    • Kai‑Ling Jiang
    • Liang Zhong
    • Xiao‑Qun Yang
    • Peng‑Peng Ma
    • Hui Wang
    • Xin‑Yu Zhu
    • Bei‑Zhong Liu
  • View Affiliations / Copyright

    Affiliations: Central Laboratory of Yongchuan Hospital, Chongqing Medical University, Chongqing 402160, P.R. China, Key Laboratory of Laboratory Medical Diagnostics, Ministry of Education, Department of Laboratory Medicine, Chongqing Medical University, Chongqing 400016, P.R. China
    Copyright: © Jiang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 7091-7098
    |
    Published online on: October 3, 2017
       https://doi.org/10.3892/ol.2017.7132
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Abstract

Acute promyelocytic leukemia (APL) is chara­cterized by the presence of the promyelocytic leukemia (PML)‑retinoic acid receptor‑α (RAR‑α) fusion protein. PML‑RARα can be cleaved by neutrophil elastase (NE) in several positions in cells in the promyelocytic stage, nuclear location signal (NLS)‑negative PML and NLS‑RARα may be the products of PML‑RARα by NE. The function of NLS‑RARα may be affected by the addition of NLS, which would alter its localization in cells, as the role of NLS is to identify proteins for transport to the nucleus. Preliminary experiments demonstrated that the overexpression of NLS‑RARα in HL‑60 cells could promote cellular proliferation and inhibit cellular differentiation. Following treatment with all‑trans retinoic acid (ATRA), the degree of cellular differentiation was enhanced. In the present study, the localization of NLS‑RARα was identified and its activity as a novel transcriptional factor was assessed, which may be critical in the development of APL. The location of NLS‑RARα was detected in the nucleus and cytoplasm by indirect immunofluorescence and western blot analysis, with expression in the nucleus revealed to be increased compared with that in the cytoplasm. Next, native‑PAGE was performed and NLS‑RARα and RXRα were revealed to form heterodimers in the nucleus. In addition, co‑immunoprecipitation revealed an interaction between NLS‑RARα and retinoid X receptor‑α (RXRα). An electrophoresis mobility shift assay (EMSA) indicated that NLS‑RARα could bind retinoic acid response elements (RAREs) in the presence of ATRA. Indeed, NLS‑RARα could bind RAREs just as WTRARα could, including the RAREs direct repeat‑2 (DR‑2) and DR‑5. In addition, results from a luciferase reporter gene assay demonstrated that NLS‑RARα could mediate the activity of RAREs that it bound. Together, these results indicated that NLS‑RARα may be a novel transcription factor that contributes to leukemogenesis by competitively binding RAREs as heterodimers with RXRα, just as PML‑RARα does, thus repressing the gene transcription essential for myeloid differentiation. These findings indicate the potential role of NLS‑RARα targeted therapy in APL.
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Copy and paste a formatted citation
Spandidos Publications style
Jiang KL, Zhong L, Yang XQ, Ma PP, Wang H, Zhu XY and Liu BZ: NLS‑RARα is a novel transcriptional factor. Oncol Lett 14: 7091-7098, 2017.
APA
Jiang, K., Zhong, L., Yang, X., Ma, P., Wang, H., Zhu, X., & Liu, B. (2017). NLS‑RARα is a novel transcriptional factor. Oncology Letters, 14, 7091-7098. https://doi.org/10.3892/ol.2017.7132
MLA
Jiang, K., Zhong, L., Yang, X., Ma, P., Wang, H., Zhu, X., Liu, B."NLS‑RARα is a novel transcriptional factor". Oncology Letters 14.6 (2017): 7091-7098.
Chicago
Jiang, K., Zhong, L., Yang, X., Ma, P., Wang, H., Zhu, X., Liu, B."NLS‑RARα is a novel transcriptional factor". Oncology Letters 14, no. 6 (2017): 7091-7098. https://doi.org/10.3892/ol.2017.7132
Copy and paste a formatted citation
x
Spandidos Publications style
Jiang KL, Zhong L, Yang XQ, Ma PP, Wang H, Zhu XY and Liu BZ: NLS‑RARα is a novel transcriptional factor. Oncol Lett 14: 7091-7098, 2017.
APA
Jiang, K., Zhong, L., Yang, X., Ma, P., Wang, H., Zhu, X., & Liu, B. (2017). NLS‑RARα is a novel transcriptional factor. Oncology Letters, 14, 7091-7098. https://doi.org/10.3892/ol.2017.7132
MLA
Jiang, K., Zhong, L., Yang, X., Ma, P., Wang, H., Zhu, X., Liu, B."NLS‑RARα is a novel transcriptional factor". Oncology Letters 14.6 (2017): 7091-7098.
Chicago
Jiang, K., Zhong, L., Yang, X., Ma, P., Wang, H., Zhu, X., Liu, B."NLS‑RARα is a novel transcriptional factor". Oncology Letters 14, no. 6 (2017): 7091-7098. https://doi.org/10.3892/ol.2017.7132
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