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Updated: Jun 23, 2026

Stimulation of Notch Signaling in Mouse Osteoclast Precursors
08:01

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Published on: February 28, 2017

Inhibition of Notch pathway prevents osteosarcoma growth by cell cycle regulation

M Tanaka1, T Setoguchi, M Hirotsu

  • 1Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890-8520, Japan.

British Journal of Cancer
|May 21, 2009
PubMed

Insights

Inhibition of the Notch pathway slows osteosarcoma growth by affecting cell cycle regulators. This suggests targeting the Notch pathway could be a novel treatment strategy for osteosarcoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • The Notch pathway is constitutively activated in many cancers.
  • Its role in osteosarcoma pathogenesis is not well understood.

Purpose of the Study:

  • Investigate Notch pathway molecule expression in osteosarcoma.
  • Determine the effect of Notch pathway inhibition on osteosarcoma growth.

Main Methods:

  • Real-time PCR and Western blot analysis of osteosarcoma biopsy specimens.
  • Inhibition of Notch pathway using gamma-secretase inhibitor and CBF1 siRNA in vitro.
  • Assessment of tumor growth in gamma-secretase inhibitor-treated xenograft models.
  • Cell cycle analysis and evaluation of cell cycle regulator expression.

Main Results:

  • Overexpression of Notch2, Jagged1, HEY1, and HEY2; downregulation of Notch1 and DLL1 in osteosarcoma.
  • Notch pathway inhibition significantly reduced osteosarcoma cell growth in vitro and in vivo.
  • Gamma-secretase inhibitor induced G1 cell cycle arrest.
  • Inhibition decreased cell cycle accelerators (cyclin D1, E1, E2, SKP2) and increased suppressor (p21(cip1)).

Conclusions:

  • Notch pathway inhibition suppresses osteosarcoma growth via cell cycle regulator modulation.
  • Targeting the Notch pathway represents a potential therapeutic strategy for osteosarcoma.

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