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Sympathetic denervation impairs epidermal healing in cutaneous wounds
L R Kim1, K Whelpdale, M Zurowski
1Departments of Physiology and Zoology, University of Toronto, Toronto, Ontario, Canada.
Summary
Sympathetic nerves significantly impair dermal wound healing. Chemical sympathectomy delayed healing in rats, while sensory nerve removal had no effect, suggesting sympathetic efferents are crucial for skin repair.
Area of Science:
- Neuroscience
- Dermatology
- Wound Healing Research
Background:
- Peripheral nerve involvement in dermal wound healing, especially neurogenic inflammation, remains under-investigated.
- Previous studies highlighted nerve influence on ischemic skin flaps, but not skin incisions.
Purpose of the Study:
- To investigate the role of peripheral nerves in the cutaneous wound healing process of rat skin linear incisions.
- To determine whether sympathetic or sensory nerve pathways are critical for effective skin repair.
Main Methods:
- Chemical sympathectomy using 6-hydroxydopamine in rats.
- Neonatal capsaicin treatment to target sensory afferents.
- Assessment of wound healing progression at 7, 11, and 14 days post-surgery.
Main Results:
- Chemical sympathectomy significantly impaired wound healing, with only 48% healed by day 14 versus 84% in controls (p=0.0104).
- Neonatal capsaicin treatment showed no significant effect on wound healing rates (p > 0.05).
Conclusions:
- Sympathetic efferents play a crucial role in promoting dermal wound healing.
- Reduced neurogenic inflammation following sympathectomy may underlie the observed impairment in skin repair.
- This study provides the first evidence for peripheral nerve involvement in the healing of skin incisions.