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Downregulation of lncRNA CASC2 facilitates osteosarcoma growth and invasion through miR-181a

Zhiwen Ba1, Lili Gu1, Songnan Hao1

  • 1Department of Orthopedics, The Fifth Hospital of Harbin, Harbin, Heilongjiang, 150040, China.

Cell Proliferation
|December 2, 2017
PubMed
Abstract

Insights

Long non-coding RNA cancer susceptibility candidate 2 (CASC2) acts as a tumor suppressor in osteosarcoma. Its downregulation correlates with advanced stages, and its restoration inhibits cancer cell proliferation and invasion.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Long non-coding RNAs (lncRNAs) are increasingly recognized for their roles in cancer.
  • The specific function of CASC2 in osteosarcoma remains largely unknown.
  • Previous studies suggest CASC2 acts as a tumor suppressor in various cancers.

Purpose of the Study:

  • To investigate the role of CASC2 in osteosarcoma progression.
  • To determine the relationship between CASC2 expression and clinical features of osteosarcoma.
  • To elucidate the molecular mechanism underlying CASC2's function in osteosarcoma.

Main Methods:

  • Quantitative real-time PCR (qRT-PCR) to measure CASC2 and miR-181a expression.
  • Cell Counting Kit-8 (CCK-8) and colony formation assays for cell proliferation.
  • Transwell assays for cell invasion analysis.

Main Results:

  • CASC2 expression was significantly downregulated in osteosarcoma tissues and cell lines.
  • Lower CASC2 expression correlated with advanced TNM stage.
  • Overexpression of CASC2 inhibited osteosarcoma cell proliferation, colony formation, and invasion.
  • CASC2 suppressed miR-181a and enhanced its target genes RASSF6, PTEN, and ATM.
  • RASSF6 expression was also downregulated in osteosarcoma and correlated with advanced TNM stage.
  • CASC2 exerted its tumor-suppressive effects by regulating RASSF6 expression.

Conclusions:

  • CASC2 functions as a tumor suppressor in osteosarcoma.
  • CASC2 downregulation is associated with osteosarcoma progression.
  • The CASC2/miR-181a/RASSF6 axis is a potential therapeutic target for osteosarcoma.

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