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Article

Curcumin attenuates cyclosporine A‑induced renal fibrosis by inhibiting hypermethylation of the klotho promoter

  • Authors:
    • Ying Hu
    • Lijun Mou
    • Fuye Yang
    • Haiyan Tu
    • Wanbing Lin
  • View Affiliations / Copyright

    Affiliations: Department of Nephrology, The Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang 31009, P.R. China
  • Pages: 3229-3236
    |
    Published online on: August 8, 2016
       https://doi.org/10.3892/mmr.2016.5601
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Abstract

Chronic kidney disease is increasingly considered to be a worldwide public health problem and usually leads to renal fibrosis. In the present study, curcumin, a polyphenol pigment extracted from turmeric, was demonstrated to exert protective effects on renal fibrosis via the suppression of transforming growth factor‑β (TGF‑β) downstream signaling, such as plasminogen activator inhibitor‑1 (PAI‑1), α‑smooth muscle actin (α‑SMA) and collagen I (Col I) downregulation. The present findings demonstrate that curcumin exerted a protective effect on cyclosporine A‑induced renal fibrosis via a klotho (KL)‑dependent mechanism, which inhibits the TGF‑β signaling pathway. Further research indicated that curcumin induced KL expression in HK‑2 tubular epithelial cells by inhibiting CpG hypermethylation in the KL promoter, which mediates the loss of expression in cells. Methylation‑specific polymerase chain reaction (PCR) combined with bisulfite sequencing identified numerous key CpG sites, such as 249, 240 and 236, whose methylation statuses are important for KL expression. A PCR reporter assay was utilized to further confirm these findings. In addition, the effects of curcumin on the regulation of DNA methyltransferase 1 (Dnmt1) expression were evaluated, and the data suggest that curcumin inhibits Dnmt1 expression and restricts CpG hypermethylation. Thus, the current study reveals that curcumin attenuated renal fibrosis by suppressing CpG methylation in the KL promoter, thus inducing KL expression, which inhibited TGF‑β signaling, which may provide a novel therapeutic approach for the treatment of renal fibrosis.
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Copy and paste a formatted citation
Spandidos Publications style
Hu Y, Mou L, Yang F, Tu H and Lin W: Curcumin attenuates cyclosporine A‑induced renal fibrosis by inhibiting hypermethylation of the klotho promoter. Mol Med Rep 14: 3229-3236, 2016.
APA
Hu, Y., Mou, L., Yang, F., Tu, H., & Lin, W. (2016). Curcumin attenuates cyclosporine A‑induced renal fibrosis by inhibiting hypermethylation of the klotho promoter. Molecular Medicine Reports, 14, 3229-3236. https://doi.org/10.3892/mmr.2016.5601
MLA
Hu, Y., Mou, L., Yang, F., Tu, H., Lin, W."Curcumin attenuates cyclosporine A‑induced renal fibrosis by inhibiting hypermethylation of the klotho promoter". Molecular Medicine Reports 14.4 (2016): 3229-3236.
Chicago
Hu, Y., Mou, L., Yang, F., Tu, H., Lin, W."Curcumin attenuates cyclosporine A‑induced renal fibrosis by inhibiting hypermethylation of the klotho promoter". Molecular Medicine Reports 14, no. 4 (2016): 3229-3236. https://doi.org/10.3892/mmr.2016.5601
Copy and paste a formatted citation
x
Spandidos Publications style
Hu Y, Mou L, Yang F, Tu H and Lin W: Curcumin attenuates cyclosporine A‑induced renal fibrosis by inhibiting hypermethylation of the klotho promoter. Mol Med Rep 14: 3229-3236, 2016.
APA
Hu, Y., Mou, L., Yang, F., Tu, H., & Lin, W. (2016). Curcumin attenuates cyclosporine A‑induced renal fibrosis by inhibiting hypermethylation of the klotho promoter. Molecular Medicine Reports, 14, 3229-3236. https://doi.org/10.3892/mmr.2016.5601
MLA
Hu, Y., Mou, L., Yang, F., Tu, H., Lin, W."Curcumin attenuates cyclosporine A‑induced renal fibrosis by inhibiting hypermethylation of the klotho promoter". Molecular Medicine Reports 14.4 (2016): 3229-3236.
Chicago
Hu, Y., Mou, L., Yang, F., Tu, H., Lin, W."Curcumin attenuates cyclosporine A‑induced renal fibrosis by inhibiting hypermethylation of the klotho promoter". Molecular Medicine Reports 14, no. 4 (2016): 3229-3236. https://doi.org/10.3892/mmr.2016.5601
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