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Cross-regulation between Notch and p63 in keratinocyte commitment to differentiation.
Bach-Cuc Nguyen1, Karine Lefort, Anna Mandinova
1Cutaneous Biology Research Center, Massachusetts General Hospital, Charlestown, Massachusetts 02129, USA, and Department of Biochemistry, University of Lausanne, Switzerland.
Genes & Development
|April 19, 2006
Summary
Notch1 activation suppresses p63 expression in keratinocytes, impacting cell fate. This cross-talk between Notch and p63 regulates the balance between keratinocyte self-renewal and differentiation.
Area of Science:
- Cell Biology
- Molecular Biology
- Dermatology
Background:
- Notch signaling is crucial for keratinocyte differentiation and tumor suppression.
- p63, a p53 family member, plays a role in keratinocyte fate and epithelial self-renewal.
Purpose of the Study:
- To investigate the regulatory relationship between Notch1 activation and p63 expression in keratinocytes.
- To elucidate the molecular mechanisms underlying this interaction and its functional consequences.
Main Methods:
- Analysis of Notch1 activation and p63 expression in mouse and human keratinocytes.
- Investigation of the role of interferon-responsive genes (IRF7, IRF3) in the Notch1-p63 pathway.
- Assessment of p63's modulation of Notch1-dependent transcriptional activity and keratinocyte functions.
Main Results:
- Notch1 activation suppresses p63 expression via a mechanism independent of cell cycle withdrawal.
- This suppression involves the downregulation of interferon-responsive genes like IRF7 and IRF3.
- Elevated p63 counteracts Notch1's effects on keratinocyte growth and differentiation, directly inhibiting Hes-1 transcription.
Conclusions:
- A complex cross-talk exists between Notch signaling and p63.
- This interaction is critical for maintaining the balance between keratinocyte self-renewal and differentiation.
- Dysregulation of this pathway may have implications for skin homeostasis and tumorigenesis.