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Article

The downregulation of SnoN expression in human renal proximal tubule epithelial cells under high-glucose conditions is mediated by an increase in Smurf2 expression through TGF-β1 signaling

  • Authors:
    • Xiuji Li
    • Zongli Diao
    • Jiaxiang Ding
    • Ruixia Liu
    • Liyan Wang
    • Wen Huang
    • Wenhu Liu
  • View Affiliations / Copyright

    Affiliations: Department of Nephrology, Beijing Friendship Hospital, Faculty of Kidney Diseases, Capital Medical University, Beijing, P.R. China, Department of Infectious Diseases, Beijing Friendship Hospital, Capital Medical University, Beijing, P.R. China, Department of Nephrology, Beijing Tongren Hospital, Faculty of Kidney Diseases, Capital Medical University, Beijing, P.R. China
  • Pages: 415-422
    |
    Published online on: December 31, 2015
       https://doi.org/10.3892/ijmm.2015.2448
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Abstract

Transforming growth factor (TGF)-β1 is a profibrotic cytokine that plays a critical role in the progression of diabetic nephropathy (DN). Previous studies have demonstrated that the Smad transcriptional co-repressor, Ski-related novel protein N (SnoN), an antagonizer of TGF-β1/Smad signaling, is downregulated in the kidneys of diabetic rats; however, the underlying molecular mechanisms remain elusive. In the present study, we demonstrated that the upregulation of Smad ubiquitination regulatory factor-2 (Smurf2), through TGF-β1/Smad signaling, contributes to the downregulation of SnoN under high-glucose conditions in primary human renal proximal tubule epithelial cells (hRPTECs). The hRPTECs were cultured in high-glucose (30 mmol/l D-glucose) medium in the presence or absence of either the proteasome inhibitor, MG132, or the TGF-β type I receptor kinase inhibitor, SB-431542. Small interfering RNA (siRNA) was used to silence Smurf2. The expression levels of SnoN, Smurf2, Smad2 and phosphorylated (p-)Smad2 were measured by western blot analysis and RT-qPCR. The protein levels of SnoN were markedly downregulated, while its mRNA levels were increased in the hRPTECs cultured under high-glucose conditions. The protein and mRNA levels of Smurf2 were significantly increased under high-glucose conditions. The knockdown of Smurf2 increased SnoN expression in the hRPTECs cultured in high-glucose medium. Moreover, MG132 partially inhibited SnoN degradation in the hRPTECs under high-glucose conditions and SB-431542 decreased the phosphorylation of Smad2 and the expression of Smurf2 induced under high-glucose conditions. Taken together, the findings of this study demonstrate that the downregulation of SnoN expression in hRPTECs under high-glucose conditions is mediated by the increased expression of Smurf2 through the TGF-β1/Smad signaling pathway.
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Copy and paste a formatted citation
Spandidos Publications style
Li X, Diao Z, Ding J, Liu R, Wang L, Huang W and Liu W: The downregulation of SnoN expression in human renal proximal tubule epithelial cells under high-glucose conditions is mediated by an increase in Smurf2 expression through TGF-β1 signaling. Int J Mol Med 37: 415-422, 2016.
APA
Li, X., Diao, Z., Ding, J., Liu, R., Wang, L., Huang, W., & Liu, W. (2016). The downregulation of SnoN expression in human renal proximal tubule epithelial cells under high-glucose conditions is mediated by an increase in Smurf2 expression through TGF-β1 signaling. International Journal of Molecular Medicine, 37, 415-422. https://doi.org/10.3892/ijmm.2015.2448
MLA
Li, X., Diao, Z., Ding, J., Liu, R., Wang, L., Huang, W., Liu, W."The downregulation of SnoN expression in human renal proximal tubule epithelial cells under high-glucose conditions is mediated by an increase in Smurf2 expression through TGF-β1 signaling". International Journal of Molecular Medicine 37.2 (2016): 415-422.
Chicago
Li, X., Diao, Z., Ding, J., Liu, R., Wang, L., Huang, W., Liu, W."The downregulation of SnoN expression in human renal proximal tubule epithelial cells under high-glucose conditions is mediated by an increase in Smurf2 expression through TGF-β1 signaling". International Journal of Molecular Medicine 37, no. 2 (2016): 415-422. https://doi.org/10.3892/ijmm.2015.2448
Copy and paste a formatted citation
x
Spandidos Publications style
Li X, Diao Z, Ding J, Liu R, Wang L, Huang W and Liu W: The downregulation of SnoN expression in human renal proximal tubule epithelial cells under high-glucose conditions is mediated by an increase in Smurf2 expression through TGF-β1 signaling. Int J Mol Med 37: 415-422, 2016.
APA
Li, X., Diao, Z., Ding, J., Liu, R., Wang, L., Huang, W., & Liu, W. (2016). The downregulation of SnoN expression in human renal proximal tubule epithelial cells under high-glucose conditions is mediated by an increase in Smurf2 expression through TGF-β1 signaling. International Journal of Molecular Medicine, 37, 415-422. https://doi.org/10.3892/ijmm.2015.2448
MLA
Li, X., Diao, Z., Ding, J., Liu, R., Wang, L., Huang, W., Liu, W."The downregulation of SnoN expression in human renal proximal tubule epithelial cells under high-glucose conditions is mediated by an increase in Smurf2 expression through TGF-β1 signaling". International Journal of Molecular Medicine 37.2 (2016): 415-422.
Chicago
Li, X., Diao, Z., Ding, J., Liu, R., Wang, L., Huang, W., Liu, W."The downregulation of SnoN expression in human renal proximal tubule epithelial cells under high-glucose conditions is mediated by an increase in Smurf2 expression through TGF-β1 signaling". International Journal of Molecular Medicine 37, no. 2 (2016): 415-422. https://doi.org/10.3892/ijmm.2015.2448
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