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RYBP Expression Is Regulated by KLF4 and Sp1 and Is Related to Hepatocellular Carcinoma Prognosis

Qiaojiajie Zhao1, Weihua Cai2, Xuan Zhang1

  • 1From the State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100005, China.

The Journal of Biological Chemistry
|December 29, 2016
PubMed

Insights

Reduced Ring1- and YY1-binding protein (RYBP) in hepatocellular carcinoma (HCC) is linked to KLF4 and Sp1 transcription factors. Altered expression of these factors and RYBP correlates with poorer HCC prognosis and metastasis.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • Ring1- and YY1-binding protein (RYBP) expression is decreased in human cancers, but the underlying mechanisms are unclear.
  • Hepatocellular carcinoma (HCC) is a major global health concern with complex molecular underpinnings.
  • Understanding the regulation of RYBP is crucial for developing novel cancer therapies and biomarkers.

Purpose of the Study:

  • To elucidate the molecular mechanisms regulating RYBP expression in HCC.
  • To identify transcription factors involved in RYBP dysregulation in HCC.
  • To investigate the correlation between RYBP, KLF4, Sp1, and HCC patient prognosis.

Main Methods:

  • Cloning and characterization of the human RYBP gene promoter region.
  • Analysis of promoter sequence variation and CpG methylation in HCC tissues.
  • Identification and mapping of transcription factor binding sites (KLF4 and Sp1) on the RYBP promoter.
  • In vitro studies on HCC cell growth modulation by KLF4 and Sp1.
  • Correlation analysis of RYBP, KLF4, and Sp1 expression with clinical parameters in HCC patient specimens.

Main Results:

  • Decreased RYBP expression in HCC is not due to promoter mutations or methylation.
  • KLF4 suppresses and Sp1 promotes RYBP transcription by binding to its promoter.
  • KLF4 inhibits and Sp1 promotes HCC cell growth via RYBP modulation.
  • Deregulated KLF4 and Sp1 contribute to reduced RYBP levels in HCC tumors.
  • Lower RYBP levels, associated with altered KLF4/Sp1, correlate with larger tumor size, poorer differentiation, and increased metastasis.

Conclusions:

  • KLF4 and Sp1 are key regulators of RYBP expression in HCC.
  • Dysregulation of KLF4, Sp1, and RYBP is associated with poor HCC prognosis and metastasis.
  • RYBP may serve as a potential therapeutic target and prognostic biomarker for HCC, possibly in combination with KLF4 and Sp1.
Keywords:
Kruppel-like factor 4 (KLF4)RYBPgene expressiongene regulationhepatocellular carcinomapromoterspecificity protein 1 (Sp1)

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