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Updated: May 10, 2026

Stimulation of Notch Signaling in Mouse Osteoclast Precursors
08:01

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Published on: February 28, 2017

Notch Signaling is Associated with ALDH Activity and an Aggressive Metastatic Phenotype in Murine Osteosarcoma Cells

Xiaodong Mu1, Christian Isaac, Nicholas Greco

  • 1Stem Cell Research Laboratory, University of Pittsburgh Medical Center , Pittsburgh, PA , USA.

Frontiers in Oncology
|June 28, 2013
PubMed

Insights

The Notch signaling pathway is more active in highly metastatic osteosarcoma (OS) cells, driving aldehyde dehydrogenase (ALDH) activity and promoting cancer spread. Targeting Notch and ALDH may inhibit OS metastasis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Metastasis

Background:

  • Osteosarcoma (OS) is the most common bone cancer, with pulmonary metastasis being the primary cause of mortality.
  • The specific molecular mechanisms driving OS metastasis remain poorly understood.
  • Clonally related murine OS cell lines (K7M2 and K12) with differing metastatic potentials offer a valuable model system.

Purpose of the Study:

  • To investigate the role of Notch signaling in the metastatic behavior of osteosarcoma.
  • To explore the relationship between Notch signaling and aldehyde dehydrogenase (ALDH) activity in OS cells.
  • To identify potential therapeutic targets for preventing OS metastasis.

Main Methods:

  • Comparative analysis of Notch gene expression (Notch1, 2, 4) and downstream targets (Hes1, Stat3) in highly metastatic (K7M2) versus less metastatic (K12) OS cells.
  • Assessment of ALDH activity in K7M2 cells following Notch pathway inhibition.
  • In vitro evaluation of Notch signaling's impact on oxidative stress resistance, migration, invasion, and VEGF expression.

Main Results:

  • Notch genes and downstream targets were significantly upregulated in highly metastatic K7M2 cells compared to K12 cells.
  • Notch inhibition led to a reduction in ALDH activity in K7M2 cells.
  • Notch signaling correlated with increased resistance to oxidative stress, enhanced migration and invasion, and elevated VEGF expression, but not proliferation.

Conclusions:

  • Notch signaling pathway activation is associated with increased metastatic potential in osteosarcoma.
  • ALDH activity in OS cells appears to be partially regulated by the Notch pathway.
  • Both Notch and ALDH represent promising molecular targets for therapeutic intervention against osteosarcoma metastasis.
Keywords:
ALDHNotchmetastasismouse osteosarcoma cellsosteosarcoma

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