Related Experiment Videos
Denervation retards but does not prevent toetip regeneration.
1University of South Dakota School of Medicine, Division of Basic Biomedical Sciences, Vermillion, South Dakota 57069, USA.
Summary
Mammalian digit-tip regeneration occurs without complete nerve dependence, unlike newt limb regeneration. While denervation delays healing, bone regrowth ultimately occurs, suggesting alternative growth stimulation pathways in mammals.
Area of Science:
- Mammalian regeneration
- Comparative biology
- Tissue repair
Background:
- Mammalian digit-tip regeneration shares similarities with newt limb regeneration.
- The role of nerve as a mitotic stimulant in mammalian digit-tip regeneration is not fully understood.
- Nerve dependence is established in newt limb regeneration but unknown in rodents.
Purpose of the Study:
- To investigate the necessity of nerve for rodent digit-tip regeneration.
- To compare nerve dependence in mammalian and amphibian regeneration.
- To elucidate the mechanisms of mammalian digit-tip regrowth.
Main Methods:
- Sciatic nerve severance in one hindlimb of rats.
- Amputation of central digit-tips from both hind feet.
- Comparison of regrowth in innervated versus denervated digits.
- Development and application of visible bone fluorescence through nail (VBFN) technique for serial bone growth monitoring.
Main Results:
- Denervation delayed soft-tissue wound healing.
- Initial assessment at one month showed no significant effect on bone regrowth.
- VBFN technique revealed retarded bone regrowth in denervated digits.
- Complete restitution of amputated digit-tips occurred despite denervation.
Conclusions:
- Nerve is not essential for ultimate bone regrowth in rodent digit-tip regeneration.
- Neurotrophic stimulation in mammalian digit-tip regeneration differs from newt limb regeneration.
- Mammalian digit-tip regeneration may involve growth stimulation from non-neural tissues.