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Silencing of YY1 downregulates RIZ1 promoter in human osteosarcoma

Ciro Abbondanza1, Filomena de Nigris, Caterina De Rosa

  • 1Department of General Pathology, 1st School of Medicine, II University of Naples, Naples 80138, Italy.

Oncology Research
|May 21, 2008
PubMed

Insights

RIZ1 protein overexpression in osteosarcoma is transcriptionally regulated by YY1. This study reveals YY1 binds the RIZ1 promoter, enhancing its expression and suggesting a tandem regulatory mechanism in osteosarcoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • RIZ1 isoform is frequently silenced in tumors, contrasting with its high abundance in osteosarcoma.
  • YY1 protein, a target gene in osteosarcoma, influences RIZ1 expression.

Purpose of the Study:

  • To investigate the regulatory mechanism of RIZ1 overexpression in osteosarcoma cells.
  • To determine the role of YY1 protein in RIZ1 gene regulation.

Main Methods:

  • Western blot analysis to assess protein levels.
  • RT-PCR to evaluate gene expression.
  • Promoter assays to study transcriptional activity.
  • Chromatin immunoprecipitation assays to analyze histone modifications and protein binding.

Main Results:

  • RIZ1 overexpression in osteosarcoma is a transcriptional event.
  • YY1 protein binds to the RIZ1 promoter, contributing to its positive regulation.
  • YY1 presence reduces dimethyl lysine 9 histone 3, indicating epigenetic modification.
  • Overexpression of YY1 is crucial for RIZ1 positive regulation in osteosarcoma cells.

Conclusions:

  • YY1 protein plays a key role in the positive transcriptional regulation of RIZ1 in osteosarcoma.
  • The coexpression of RIZ1 and YY1 suggests a tandem regulatory mechanism in human osteosarcoma.
  • Findings provide insights into the molecular mechanisms underlying osteosarcoma development.

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