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Updated: May 15, 2026

Stimulation of Notch Signaling in Mouse Osteoclast Precursors
08:01

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Published on: February 28, 2017

Osteoblast lineage-specific effects of notch activation in the skeleton

Ernesto Canalis1, Kristen Parker, Jian Q Feng

  • 1Department of Research, Saint Francis Hospital and Medical Center, 114 Woodland Street, Hartford, CT 06105-1299, USA. ecanalis@stfranciscare.org

Endocrinology
|January 1, 2013
PubMed

Insights

Notch signaling impacts bone health differently based on cell type. Activating Notch in early osteoblasts causes bone loss, while in osteocytes, it initially reduces bone resorption, leading to increased bone volume.

Area of Science:

  • Skeletal Biology
  • Cell Signaling
  • Developmental Biology

Background:

  • Notch signaling plays a complex role in bone metabolism.
  • Previous studies show conflicting effects of Notch activation and inactivation on bone density and osteoblast differentiation.
  • The precise role of Notch in specific osteoblastic lineage cells and osteocytes remains undefined.

Purpose of the Study:

  • To investigate the cell-context-dependent effects of Notch activation in the osteoblastic lineage and osteocytes.
  • To define the consequences of Notch signaling in immature osteoblasts versus mature osteocytes.

Main Methods:

  • Utilized Rosa(Notch) mice crossed with Cre-driver lines (Osx-Cre, Oc-Cre, Col2.3-Cre, Dmp1-Cre) to achieve cell-specific Notch activation.
  • Analyzed bone phenotypes at 1 and 3 months of age, including bone volume, osteoblast and osteoclast numbers, and bone formation markers.

Main Results:

  • Osx-Cre and Oc-Cre mice showed osteopenia due to impaired bone formation at 1 month.
  • Col2.3-Cre and Dmp1-Cre mice exhibited increased trabecular bone volume with reduced osteoclast activity.
  • Osx-Cre and Dmp1-Cre mice at 3 months displayed increased bone volume and osteoblasts, but with abnormal bone formation patterns.

Conclusions:

  • Notch signaling's skeletal effects are highly cell-context-dependent.
  • Notch activation in immature osteoblasts inhibits differentiation and causes osteopenia.
  • Notch activation in osteocytes initially suppresses bone resorption, increasing bone volume, with evolving phenotypes over time.

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