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International Journal of Molecular Medicine
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Article

TGF-β1 induces the dissolution of tight junctions in human renal proximal tubular cells: Role of the RhoA/ROCK signaling pathway

  • Authors:
    • Ke Zhang
    • Hao Zhang
    • Hui Xiang
    • Jishi Liu
    • Yan Liu
    • Xianming Zhang
    • Jianwen Wang
    • Youzhou Tang
  • View Affiliations / Copyright

    Affiliations: Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China
  • Pages: 464-468
    |
    Published online on: May 29, 2013
       https://doi.org/10.3892/ijmm.2013.1396
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Abstract

The RhoA/ROCK signaling pathway plays a significant role in transforming growth factor (TGF)-β1‑mediated epithelial-mesenchymal transition (EMT). It remains unclear, however, whether the RhoA/ROCK signaling pathway mediates TGF-β1-induced EMT by promoting the dissolution of tight junctions (TJs) in renal proximal tubular epithelial cells. In this study, we aimed to investigate the association between TGF-β1-mediated Rho/ROCK signaling and TJs in a cell line derived from human renal proximal tubular cells (HK-2 cells). HK-2 cells were treated with 5 ng/ml TGF-β1 for 0, 12, 24 and 48 h. Zona occludens protein  1 (also known as tight junction protein 1; ZO-1) and occludin mRNA and protein levels were determined by real-time PCR and western blot analysis, respectively. The HK-2 cells were then divided into three groups: a control group (serum-free culture medium for 24 h); a TGF-β1 group (treated with 5 ng/ml TGF-β1 for 24 h); and a TGF-β1 + Y-27632 (a specific ROCK inhibitor) group (pre-treated with 10 µM Y-27632 for 2 h and subsequently treated with 5 ng/ml TGF-β1 for 24 h). The levels of ZO-1 and occludin were detected by real-time PCR, western blot analysis and immunofluorescence. As shown by our results, the mRNA and protein levels of ZO-1 and occludin were decreased in the HK-2 cells following treatment with TGF-β1 in a time-dependent manner; in addition, ZO-1 and occludin levels in the TGF-β1 + Y-27632 group were significantly increased compared with those of the TGF-β1 group (P<0.05), with no significant changes compared with the control group. Our results indicate that the Rho/ROCK signaling pathway mediated by TGF-β1 plays a role in the dissolution of TJs during EMT.
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Copy and paste a formatted citation
Spandidos Publications style
Zhang K, Zhang H, Xiang H, Liu J, Liu Y, Zhang X, Wang J and Tang Y: TGF-β1 induces the dissolution of tight junctions in human renal proximal tubular cells: Role of the RhoA/ROCK signaling pathway. Int J Mol Med 32: 464-468, 2013.
APA
Zhang, K., Zhang, H., Xiang, H., Liu, J., Liu, Y., Zhang, X. ... Tang, Y. (2013). TGF-β1 induces the dissolution of tight junctions in human renal proximal tubular cells: Role of the RhoA/ROCK signaling pathway. International Journal of Molecular Medicine, 32, 464-468. https://doi.org/10.3892/ijmm.2013.1396
MLA
Zhang, K., Zhang, H., Xiang, H., Liu, J., Liu, Y., Zhang, X., Wang, J., Tang, Y."TGF-β1 induces the dissolution of tight junctions in human renal proximal tubular cells: Role of the RhoA/ROCK signaling pathway". International Journal of Molecular Medicine 32.2 (2013): 464-468.
Chicago
Zhang, K., Zhang, H., Xiang, H., Liu, J., Liu, Y., Zhang, X., Wang, J., Tang, Y."TGF-β1 induces the dissolution of tight junctions in human renal proximal tubular cells: Role of the RhoA/ROCK signaling pathway". International Journal of Molecular Medicine 32, no. 2 (2013): 464-468. https://doi.org/10.3892/ijmm.2013.1396
Copy and paste a formatted citation
x
Spandidos Publications style
Zhang K, Zhang H, Xiang H, Liu J, Liu Y, Zhang X, Wang J and Tang Y: TGF-β1 induces the dissolution of tight junctions in human renal proximal tubular cells: Role of the RhoA/ROCK signaling pathway. Int J Mol Med 32: 464-468, 2013.
APA
Zhang, K., Zhang, H., Xiang, H., Liu, J., Liu, Y., Zhang, X. ... Tang, Y. (2013). TGF-β1 induces the dissolution of tight junctions in human renal proximal tubular cells: Role of the RhoA/ROCK signaling pathway. International Journal of Molecular Medicine, 32, 464-468. https://doi.org/10.3892/ijmm.2013.1396
MLA
Zhang, K., Zhang, H., Xiang, H., Liu, J., Liu, Y., Zhang, X., Wang, J., Tang, Y."TGF-β1 induces the dissolution of tight junctions in human renal proximal tubular cells: Role of the RhoA/ROCK signaling pathway". International Journal of Molecular Medicine 32.2 (2013): 464-468.
Chicago
Zhang, K., Zhang, H., Xiang, H., Liu, J., Liu, Y., Zhang, X., Wang, J., Tang, Y."TGF-β1 induces the dissolution of tight junctions in human renal proximal tubular cells: Role of the RhoA/ROCK signaling pathway". International Journal of Molecular Medicine 32, no. 2 (2013): 464-468. https://doi.org/10.3892/ijmm.2013.1396
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