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Article

Expression of interferon regulatory factor 5 is regulated by the Sp1 transcription factor

  • Authors:
    • Jin Shu
    • Xiao‑Hua Wang
    • Lan‑Bo Zhou
    • Chun‑Ming Jiang
    • Wei‑Xia Yang
    • Rui Jin
    • Lu‑Lu Wang
    • Guo‑Ping Zhou
  • View Affiliations / Copyright

    Affiliations: Department of Pediatrics, The First Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China, 2013 Clinical Class 7, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu 210029, P.R. China
  • Pages: 2815-2822
    |
    Published online on: July 27, 2016
       https://doi.org/10.3892/mmr.2016.5565
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Abstract

The transcription factor, interferon regulatory factor 5 (IRF5), is important in the induction of type I interferon, proinflammatory cytokines and chemokines, and is involved in autoimmune diseases and tumourigenesis. However, the mechanisms underlying the transcriptional regulation of wild‑type IRF5 remain to be fully elucidated. The present study was primarily designed to clarify whether specificity protein 1 (Sp1) was involved in the regulation of IRF5. Initially, the IRF5 promoter region was cloned and its promoter activity was examined using Hela and HEK 293 cells. Deletion analyses revealed that the region spanning ‑179 to +62 was the minimal promoter of IRF5. Bioinformatics analyses showed that this region contained three putative Sp1 binding sites, and mutational analyses revealed that all the Sp1 sites contributed to transcriptional activity. Secondly, the overexpression of Sp1 was found to increase the activity of the IRF5 promoter and the mRNA level of IRF5, determined using reporter gene assays and polymerase chain reaction analysis, respectively. By contrast, treatment with mithramycin and Sp1 small interfering RNA significantly reduced the activity of the IRF5 promoter and the mRNA level of IRF5. Finally, the results of an electrophoretic mobility shift assay and a chromatin immunoprecipitation assay demonstrated that Sp1 bound to the promoter region of IRF5 in vitro and in vivo. These results suggested that the Sp1 transcription factor is the primary determinant for activating the basal transcription of the IRF5.
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Copy and paste a formatted citation
Spandidos Publications style
Shu J, Wang XH, Zhou LB, Jiang CM, Yang WX, Jin R, Wang LL and Zhou GP: Expression of interferon regulatory factor 5 is regulated by the Sp1 transcription factor. Mol Med Rep 14: 2815-2822, 2016.
APA
Shu, J., Wang, X., Zhou, L., Jiang, C., Yang, W., Jin, R. ... Zhou, G. (2016). Expression of interferon regulatory factor 5 is regulated by the Sp1 transcription factor. Molecular Medicine Reports, 14, 2815-2822. https://doi.org/10.3892/mmr.2016.5565
MLA
Shu, J., Wang, X., Zhou, L., Jiang, C., Yang, W., Jin, R., Wang, L., Zhou, G."Expression of interferon regulatory factor 5 is regulated by the Sp1 transcription factor". Molecular Medicine Reports 14.3 (2016): 2815-2822.
Chicago
Shu, J., Wang, X., Zhou, L., Jiang, C., Yang, W., Jin, R., Wang, L., Zhou, G."Expression of interferon regulatory factor 5 is regulated by the Sp1 transcription factor". Molecular Medicine Reports 14, no. 3 (2016): 2815-2822. https://doi.org/10.3892/mmr.2016.5565
Copy and paste a formatted citation
x
Spandidos Publications style
Shu J, Wang XH, Zhou LB, Jiang CM, Yang WX, Jin R, Wang LL and Zhou GP: Expression of interferon regulatory factor 5 is regulated by the Sp1 transcription factor. Mol Med Rep 14: 2815-2822, 2016.
APA
Shu, J., Wang, X., Zhou, L., Jiang, C., Yang, W., Jin, R. ... Zhou, G. (2016). Expression of interferon regulatory factor 5 is regulated by the Sp1 transcription factor. Molecular Medicine Reports, 14, 2815-2822. https://doi.org/10.3892/mmr.2016.5565
MLA
Shu, J., Wang, X., Zhou, L., Jiang, C., Yang, W., Jin, R., Wang, L., Zhou, G."Expression of interferon regulatory factor 5 is regulated by the Sp1 transcription factor". Molecular Medicine Reports 14.3 (2016): 2815-2822.
Chicago
Shu, J., Wang, X., Zhou, L., Jiang, C., Yang, W., Jin, R., Wang, L., Zhou, G."Expression of interferon regulatory factor 5 is regulated by the Sp1 transcription factor". Molecular Medicine Reports 14, no. 3 (2016): 2815-2822. https://doi.org/10.3892/mmr.2016.5565
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