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Updated: May 29, 2026
08:01
Stimulation of Notch Signaling in Mouse Osteoclast Precursors
Published on: February 28, 2017
Notch1 signaling regulates chondrogenic lineage determination through Sox9 activation
R Haller1, R Schwanbeck, S Martini
1Department of Virology and Cell Biology, University of Lübeck, Ratzeburger Allee 160, Lübeck, Germany.
Cell Death and Differentiation
|August 27, 2011
Summary
Notch1 signaling regulates chondrogenesis by transiently activating Sox9 expression during early embryonic development. This pathway is crucial for cell lineage determination and chondrogenic differentiation in stem cells.
Area of Science:
- Developmental Biology
- Stem Cell Biology
- Molecular Signaling
Background:
- Notch signaling is fundamental for cell fate decisions during embryonic development.
- Sox9 is identified as a key target gene regulated by Notch1 signaling in embryonic stem cells (ESCs).
Purpose of the Study:
- To investigate the role of Notch signaling in chondrogenesis using an in vitro differentiation model.
- To elucidate the mechanism by which Notch1 signaling induces Sox9 expression and influences chondrogenic lineage determination.
Main Methods:
- Utilized an in vitro chondrogenesis protocol from ESCs via embryoid bodies (EBs).
- Employed a tamoxifen-inducible system for temporal Notch1 activation.
- Assessed Sox9 expression and chondrogenic differentiation markers.
- Used siRNA to knockdown Sox9 expression.
Main Results:
- Transient Notch1 activation during early EB formation rapidly upregulated Sox9 and induced chondrogenesis.
- Knockdown of the Notch1-induced Sox9 peak abrogated chondrogenic differentiation.
- Continuous Notch1 activation inhibited chondrogenesis.
- Early Notch1 activation also affected cardiac differentiation, independently of Sox9.
Conclusions:
- Notch1 signaling plays a critical role in early chondrogenic lineage determination.
- Regulation of Sox9 expression by Notch1 is essential for inducing chondrogenesis.
- Notch1 signaling exhibits context-dependent effects on different cell lineages.
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The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
03:14Notch Signaling Pathway
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The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
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