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Caveolin-1 promotes Rfng expression via Erk-Jnk-p38 signaling pathway in mouse hepatocarcinoma cells

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Abstract

Caveolin-1 (Cav-1) is a critical structural protein of caveolae and plays an oncogene-like role by participating in abnormal protein glycosylation in hepatocellular carcinoma (HCC). However, the mechanism by which Cav-1 regulates glycosylation and glycosyltransferase expression has not been completely defined. Here, we show that Cav-1 promotes the expression of Rfng, which is a β-1,3-N-acetylglucosaminyltransferase included in the Fringe family. In this study, we showed that the mouse HCC cell line, Hepa1–6, with low Rfng transcription and protein levels, lacked Cav-1 expression, whereas strong Rfng expression was found in the mouse HCC cell line Hca-F, with high transcription and protein levels for Cav-1. Subsequently Cav-1 overexpression in Hepa1–6 was found to activate mitogen-activated protein kinase (MAPK) signaling and induce phosphorylation of the transcription factors Hnf4a and Sp1, which bind to the Rfng promoter region to promote its transcription. On the contrary, when knocking down Cav-1 expression in Hca-F, the activity of the MAPK pathway was significantly inhibited, and phosphorylation of Hnf4a, Sp1 and the expression of Rfng were attenuated. These data reveal that Cav-1 promotes phosphorylation of transcription factors Hnf4a and Sp1, which bind to the Rfng promoter region, via the MAPK signaling pathway, to induce the transcription of Rfng. Our current findings provide molecular genetic evidence that Cav-1 plays an important role in regulating glycosyltransferase expression and may participate in the abnormal glycosylation that mediates the invasion and metastasis of HCC.

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Authors and Affiliations

  1. School of Life Science and Medicine, Dalian University of Technology, Panjin, 122406, China

    Cheng Zhang, Qiong Wu, Huang Huang, Xixi Chen, Tianmiao Huang, Wenli Li, Yubo Liu & Jianing Zhang

  2. School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China

    Wenli Li

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  1. Cheng Zhang
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  2. Qiong Wu
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  3. Huang Huang
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Correspondence to Yubo Liu or Jianing Zhang.

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Zhang, C., Wu, Q., Huang, H. et al. Caveolin-1 promotes Rfng expression via Erk-Jnk-p38 signaling pathway in mouse hepatocarcinoma cells. J Physiol Biochem 75, 549–559 (2019). https://doi.org/10.1007/s13105-019-00703-6

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  • DOI: https://doi.org/10.1007/s13105-019-00703-6

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