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Epigenetic regulation of the pro-apoptosis gene TSSC3 in human osteosarcoma cells

Yi Li1, Yusheng Huang1, Yangfan Lv1

  • 1Department of Pathology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China.

Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|November 26, 2013
PubMed

Insights

Osteosarcoma cell growth is suppressed by the TSSC3 gene, which is silenced by promoter hypermethylation. Reactivating TSSC3 via DNA demethylation offers a potential therapeutic strategy for osteosarcoma.

Area of Science:

  • Oncology
  • Epigenetics
  • Molecular Biology

Background:

  • Promoter hypermethylation is a known mechanism for genetic imprinting loss in cancer.
  • The specific mechanism of TSSC3 gene silencing in osteosarcoma remains uninvestigated.

Purpose of the Study:

  • To investigate the role of TSSC3 gene silencing in osteosarcoma.
  • To explore the potential of epigenetic modification for osteosarcoma therapy.

Main Methods:

  • Osteosarcoma cell lines were treated with 5-Aza-CdR (DNA methyltransferase inhibitor).
  • TSSC3 expression, promoter methylation, cell growth, morphology, and apoptosis were analyzed.
  • TSSC3 was overexpressed in SaOS2 cells to assess its functional role.

Main Results:

  • 5-Aza-CdR treatment reduced cell growth, induced non-motile phenotypes, and increased apoptosis in a dose-dependent manner.
  • 5-Aza-CdR reactivated TSSC3 expression by demethylating promoter regions, indicating TSSC3 is silenced by hypermethylation.
  • TSSC3 overexpression suppressed SaOS2 cell growth and increased apoptosis via caspase-3 upregulation.

Conclusions:

  • TSSC3 is epigenetically silenced by promoter hypermethylation in osteosarcoma.
  • TSSC3 functions as a pro-apoptosis gene, potentially maintaining growth balance.
  • Epigenetic regulation of TSSC3 presents a promising avenue for novel osteosarcoma therapies.
Keywords:
5-Aza-CdRMethylationOsteosarcomaTSSC3

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