Upregulation of miRNA-155 expression by OxLDL in dendritic cells involves JAK1/2 kinase and transcription factors YY1 and MYB

  • Authors:
    • Hui Yan
    • Shuai Wang
    • Zhenwei Li
    • Wenting Zhao
    • Zhen Wang
    • Zewei Sun
    • Yanyun Pan
    • Jianhua Zhu
  • View Affiliations

  • Published online on: March 11, 2016     https://doi.org/10.3892/ijmm.2016.2526
  • Pages: 1371-1378
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Abstract

Dendritic cells (DCs) have been implicated in the pathogenesis of atherosclerosis (AS). Whereas the pathogenic role of oxidized low-density lipoprotein (oxLDL) in the development and progression of AS has been recognized previously, the contribution of microRNA-155 (miR-155) to AS was previously not fully understood. It had also been noted that miR-155 levels were upregulated by oxLDL in various cell types under different (patho)physiological conditions, but its underlying mechanisms had not been examiend in detail. Thus, in the present study, we observed that oxLDL treatment increased miR-155 expression in DCs, and transfecting DCs with siRNA against scavenger receptor A (SRA) revealed that repression of SRA attenuated this upregulation. We also noted that miR-155 negatively regulated SRA expression by suppressing the JNK pathway. Furthermore, we noted that Yin Yang 1 (YY1) and V-Myb avian myeloblastosis viral oncogene homolog (MYB), which were also upregulated by oxLDL, directly bound to the cognate sequences of the promoter region of miR-155 to activate its transcription. In addition, using SP600125, a specific inhibitor for c-Jun N-terminal kinase (JNK) signaling, we demonstrated that JNK signaling was involved in the miR‑155-mediated suppression of SRA expression. Thus, in the present study we uncovered the molecular mechanism through which miR-155 expression is regulated by oxLDL, and we also identified a negative feedback loop, miR‑155-JNK-SRA-miR-155. Our findings thus provide novel insights into the regulatory network underlying the expression and activity of miR-155 in DCs.
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May-2016
Volume 37 Issue 5

Print ISSN: 1107-3756
Online ISSN:1791-244X

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Spandidos Publications style
Yan H, Wang S, Li Z, Zhao W, Wang Z, Sun Z, Pan Y and Zhu J: Upregulation of miRNA-155 expression by OxLDL in dendritic cells involves JAK1/2 kinase and transcription factors YY1 and MYB. Int J Mol Med 37: 1371-1378, 2016
APA
Yan, H., Wang, S., Li, Z., Zhao, W., Wang, Z., Sun, Z. ... Zhu, J. (2016). Upregulation of miRNA-155 expression by OxLDL in dendritic cells involves JAK1/2 kinase and transcription factors YY1 and MYB. International Journal of Molecular Medicine, 37, 1371-1378. https://doi.org/10.3892/ijmm.2016.2526
MLA
Yan, H., Wang, S., Li, Z., Zhao, W., Wang, Z., Sun, Z., Pan, Y., Zhu, J."Upregulation of miRNA-155 expression by OxLDL in dendritic cells involves JAK1/2 kinase and transcription factors YY1 and MYB". International Journal of Molecular Medicine 37.5 (2016): 1371-1378.
Chicago
Yan, H., Wang, S., Li, Z., Zhao, W., Wang, Z., Sun, Z., Pan, Y., Zhu, J."Upregulation of miRNA-155 expression by OxLDL in dendritic cells involves JAK1/2 kinase and transcription factors YY1 and MYB". International Journal of Molecular Medicine 37, no. 5 (2016): 1371-1378. https://doi.org/10.3892/ijmm.2016.2526