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Article

TIPE2, a negative regulator of TLR signaling, regulates p27 through IRF4-induced signaling

  • Authors:
    • Yanping Peng
    • Qian Zhao
    • Hanyu Zhang
    • Bo Han
    • Suxia Liu
    • Mingyong Han
    • Shili Liu
  • View Affiliations / Copyright

    Affiliations: School of Medicine, Shandong University, Jinan, Shandong 250012, P.R. China
  • Pages: 2480-2486
    |
    Published online on: January 14, 2016
       https://doi.org/10.3892/or.2016.4562
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Abstract

Targeted inhibition of specific toll-like receptor (TLR) pathways may provide an effective strategy to prevent the development of selected gastric malignancies. Tumor necrosis factor (TNF)-α-induced protein 8-like-2 (TIPE2) was identified as a novel negative regulator of TLR signaling. Our previous study identified TIPE2 as an inhibitor of gastric cancer cell growth; it promotes p27 expression, which leads to restored control of the cell cycle and cell division. However, the molecular mechanism by which TIPE2 regulates p27 remains unclear. In the present study, we examined the expression patterns of TIPE2 in serial clinical gastritis tissues as well as gastric cancer, and found a negative correlation between TIPE2 expression and progression of gastritis to gastric cancer. This negative correlation verified the role of TIPE2 in preventing the occurrence and development of gastric cancer, suggesting that TIPE2 may be a potential biomarker for gastric cancer progression. To determine the mechanism employed by TIPE2 in gastric cell carcinogenesis, a TIPE2-expressing plasmid was introduced into gastric cell lines, and microarray and western blot analysis revealed that TIPE2 selectively upregulates the expression of interferon regulatory factor 4 (IRF4). Variations in IRF4 expression were additionally verified in knockout mice. Next, the effect of IRF4 on p27 expression was tested by an IRF4 siRNA interference assay. Finally, we explored the signaling pathways used by TIPE2 to regulate IRF4. An experiment using pathway inhibitors and a nuclear factor κ-light-chain enhancer of activated B cells (NF-κB) luciferase reporter assay showed that NF-κB plays a crucial role in regulating IRF4 expression. Our data provide evidence that TIPE2, a potential biomarker for gastric cancer progression, stimulates an IRF4-associated signaling cascade that promotes p27 expression and controls cell growth. To the best of our knowledge, this is the first study to demonstrate that IRF4 acts as an inhibitor of epithelial cell proliferation and mediates the expression of TIPE2, a negative regulator of TLR signaling, to control cell growth.
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Copy and paste a formatted citation
Spandidos Publications style
Peng Y, Zhao Q, Zhang H, Han B, Liu S, Han M and Liu S: TIPE2, a negative regulator of TLR signaling, regulates p27 through IRF4-induced signaling. Oncol Rep 35: 2480-2486, 2016.
APA
Peng, Y., Zhao, Q., Zhang, H., Han, B., Liu, S., Han, M., & Liu, S. (2016). TIPE2, a negative regulator of TLR signaling, regulates p27 through IRF4-induced signaling. Oncology Reports, 35, 2480-2486. https://doi.org/10.3892/or.2016.4562
MLA
Peng, Y., Zhao, Q., Zhang, H., Han, B., Liu, S., Han, M., Liu, S."TIPE2, a negative regulator of TLR signaling, regulates p27 through IRF4-induced signaling". Oncology Reports 35.4 (2016): 2480-2486.
Chicago
Peng, Y., Zhao, Q., Zhang, H., Han, B., Liu, S., Han, M., Liu, S."TIPE2, a negative regulator of TLR signaling, regulates p27 through IRF4-induced signaling". Oncology Reports 35, no. 4 (2016): 2480-2486. https://doi.org/10.3892/or.2016.4562
Copy and paste a formatted citation
x
Spandidos Publications style
Peng Y, Zhao Q, Zhang H, Han B, Liu S, Han M and Liu S: TIPE2, a negative regulator of TLR signaling, regulates p27 through IRF4-induced signaling. Oncol Rep 35: 2480-2486, 2016.
APA
Peng, Y., Zhao, Q., Zhang, H., Han, B., Liu, S., Han, M., & Liu, S. (2016). TIPE2, a negative regulator of TLR signaling, regulates p27 through IRF4-induced signaling. Oncology Reports, 35, 2480-2486. https://doi.org/10.3892/or.2016.4562
MLA
Peng, Y., Zhao, Q., Zhang, H., Han, B., Liu, S., Han, M., Liu, S."TIPE2, a negative regulator of TLR signaling, regulates p27 through IRF4-induced signaling". Oncology Reports 35.4 (2016): 2480-2486.
Chicago
Peng, Y., Zhao, Q., Zhang, H., Han, B., Liu, S., Han, M., Liu, S."TIPE2, a negative regulator of TLR signaling, regulates p27 through IRF4-induced signaling". Oncology Reports 35, no. 4 (2016): 2480-2486. https://doi.org/10.3892/or.2016.4562
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