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Published on: January 26, 2012
Long-term sensory hyperinnervation following neonatal skin wounds
1Department of Anatomy and Developmental Biology, University College London, United Kingdom.
The Journal of Comparative Neurology
|August 7, 1995
Summary
Neonatal skin wounds in rats cause long-lasting sensory nerve overgrowth (hyperinnervation) that significantly increases skin innervation density. This response, driven by both A- and C-fibers, highlights developmental plasticity in skin nerve regeneration.
Area of Science:
- Neuroscience
- Developmental Biology
- Wound Healing Research
Background:
- Skin innervation is crucial for sensory perception and tissue homeostasis.
- Understanding nerve regeneration after injury is vital for therapeutic development.
- Neonatal development presents a unique window for studying tissue plasticity.
Purpose of the Study:
- To investigate the long-term effects of neonatal skin wounding on cutaneous innervation.
- To determine the contribution of different sensory and sympathetic nerve fibers to the hyperinnervation response.
- To assess the impact of neonatal skin wounding on sensory function.
Main Methods:
- Immunocytochemical staining using panneuronal marker (PGP 9.5) and specific markers for neuronal populations (RT97, CGRP, tyrosine hydroxylase).
- Image analysis for quantifying skin innervation density in wounded and control areas.
- Neonatal capsaicin and 6-hydroxydopamine treatments to deplete specific nerve populations.
- Behavioral sensory testing to measure mechanical thresholds.
Main Results:
- Neonatal skin wounds induced significant, long-lasting hyperinnervation (up to 300% increase in density) persisting for over 12 weeks.
- The hyperinnervation response was most pronounced when wounds occurred at postnatal days 0 or 7.
- Both A- and C-fiber sensory axons contributed to hyperinnervation, while sympathetic axons did not sprout into the wounded area.
- Neonatal capsaicin treatment significantly reduced hyperinnervation, confirming major C-fiber contribution.
- Wounded areas showed a 50% reduction in mechanical threshold, indicating altered sensory function.
Conclusions:
- Neonatal skin wounding triggers remarkable long-term plasticity in cutaneous innervation density.
- The developmental stage at the time of injury critically influences the extent and duration of nerve sprouting.
- These findings underscore the significant regenerative capacity and plasticity of the developing nervous system following injury.
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