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The tumor suppressive role of RASSF1A in osteosarcoma through the Wnt signaling pathway

Wei-Guo Wang1, Shi-Jie Chen1, Jin-Shen He1

  • 1Department of Orthopaedic Surgery, The Third Xiangya Hospital of Central South University, 138 Tong Zi Po Road, Yuelu District, Changsha, Hunan, 410013, People's Republic of China.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|January 12, 2016
PubMed

Insights

Ras-association domain family 1 isoform A (RASSF1A) is a tumor suppressor gene. Its low expression in osteosarcoma correlates with severity, and restoring RASSF1A inhibits tumor growth and metastasis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Ras-association domain family 1 isoform A (RASSF1A) is a known tumor suppressor gene.
  • RASSF1A expression is frequently lost in various cancers, including osteosarcoma.
  • The specific role of RASSF1A in osteosarcoma pathogenesis remains largely undefined.

Purpose of the Study:

  • To investigate the functional significance of RASSF1A in osteosarcoma.
  • To determine the correlation between RASSF1A expression levels and clinical severity in osteosarcoma patients.
  • To elucidate the molecular mechanisms by which RASSF1A exerts its tumor-suppressive effects in osteosarcoma.

Main Methods:

  • Quantitative real-time PCR to measure RASSF1A mRNA expression in tumor and non-tumoral tissues.
  • Adenoviral vector-mediated RASSF1A overexpression in osteosarcoma cell lines (MNNG/HOS and SaOS2).
  • In vitro assays for cell proliferation (MTT), migration, invasion (transwell), apoptosis, and cell cycle (flow cytometry).
  • In vivo study using xenograft tumor models in mice.
  • Western blot analysis for protein expression and dual-luciferase assay for Wnt/β-catenin signaling activity.

Main Results:

  • RASSF1A mRNA expression was significantly lower in osteosarcoma tissues compared to non-tumoral tissues, correlating with clinical severity.
  • Overexpression of RASSF1A via rAd-RASSF1A significantly inhibited xenograft tumor growth in mice.
  • RASSF1A overexpression suppressed osteosarcoma cell proliferation, migration, and invasion, while inducing apoptosis and G0/G1 cell cycle arrest.
  • RASSF1A suppressed Wnt/β-catenin activity, reduced Akt/GSK3-β phosphorylation, increased MST1 phosphorylation, and downregulated cyclin D1, c-Myc, and MMP-7 protein levels.

Conclusions:

  • RASSF1A functions as a critical tumor suppressor in osteosarcoma.
  • RASSF1A exerts anti-cancer effects by inhibiting proliferation, migration, and invasion, and promoting apoptosis.
  • The tumor-suppressive role of RASSF1A is mediated through the regulation of the Akt/GSK-3-Wnt/β-catenin signaling pathway.
Keywords:
OsteosarcomaRASSF1AWntβ-catenin

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