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Adult Mouse Digit Amputation and Regeneration: A Simple Model to Investigate Mammalian Blastema Formation and Intramembranous Ossification
Published on: July 12, 2019
Epimorphic regeneration in mice is p53-independent
L Matthew Arthur1, Renee M Demarest, Lise Clark
1The Wistar Institute, Science Applications International Corporation-Frederick, National Cancer Institute, Frederick Cancer Research and Development Center, Frederick, MD, USA.
Cell Cycle (Georgetown, Tex.)
|September 22, 2010
Summary
Mouse ear regeneration occurs independently of p53 signaling. The p21 protein
Area of Science:
- Regenerative medicine
- Mammalian wound healing
- Molecular biology
Background:
- Regeneration is studied in species like sponges and salamanders.
- MRL mouse ear holes offer a unique mammalian regeneration model.
- p21(Cip1/Waf1) absence correlates with ear hole closure in MRL mice.
Purpose of the Study:
- To investigate the role of p53 in MRL mouse ear hole regeneration.
- To understand the regulation of p21 in mammalian appendage regeneration.
Main Methods:
- Utilized backcross mice, including MRL.p53(-/-) and p21(-/-) strains.
- Analyzed ear sections for cellular changes (adipocytes, chondrocytes) post-injury.
- Examined other cell cycle-related mutant mice (p16, Gadd45, Tgfβ/Rag2 knockout).
Main Results:
- Loss of p53 did not impair MRL mouse ear healing.
- MRL.p53(-/-) mice showed increased adipocytes and chondrocytes during healing.
- p16 and Gadd45 null mice exhibited limited healing capacity; Tgfβ/Rag2 knockout showed partial healing.
Conclusions:
- Mouse appendage regeneration is independent of p53 signaling.
- p21 may regulate regeneration by affecting the Tgfβ/Smad pathway.
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