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Updated: Apr 24, 2026
Assessment of Acute Wound Healing using the Dorsal Subcutaneous Polyvinyl Alcohol Sponge Implantation and Excisional Tail Skin Wound Models.
Published on: March 25, 2020
Deletion of the α2A/α2C-adrenoceptors accelerates cutaneous wound healing in mice
Bruna Romana-Souza1, Adriana P Nascimento, Patricia C Brum
1Department of Histology and Embryology, State University of Rio de Janeiro, Rio de Janeiro, Brazil.
Abstract:
The α2-adrenoceptors regulate the sympathetic nervous system, controlling presynaptic catecholamine release. However, the role of the α2-adrenoceptors in cutaneous wound healing is poorly understood. Mice lacking both the α2A/α2C-adrenoceptors were used to evaluate the participation of the α2-adrenoceptor during cutaneous wound healing. A full-thickness excisional lesion was performed on the dorsal skin of the α2A/α2C-adrenoceptor knockout and wild-type mice. Seven or fourteen days later, the animals were euthanized and the lesions were formalin-fixed and paraffin-embedded or frozen. Murine skin fibroblasts were also isolated from α2A/α2C-adrenoceptor knockout and wild-type mice, and fibroblast activity was evaluated. The in vivo study demonstrated that α2A/α2C-adrenoceptor depletion accelerated wound contraction and re-epithelialization. A reduction in the number of neutrophils and macrophages was observed in the α2A/α2C-adrenoceptor knockout mice compared with wild-type mice. In addition, α2A/α2C-adrenoceptor depletion enhanced the levels of nitrite and hydroxyproline, and the protein expression of transforming growth factor-β and vascular endothelial growth factor. Furthermore, α2A/α2C-adrenoceptor depletion accelerated blood vessel formation and myofibroblast differentiation. The in vitro study demonstrated that skin fibroblasts isolated from α2A/α2C-adrenoceptor knockout mice exhibited enhanced cell migration, α-smooth muscle actin _protein expression and collagen deposition compared with wild-type skin fibroblasts. In conclusion, α2A/α2C-adrenoceptor deletion accelerates cutaneous wound healing in mice.
Insights
Deleting alpha2A/alpha2C-adrenoceptors speeds up skin wound healing in mice. This involves faster wound contraction, re-epithelialization, and enhanced fibroblast activity, suggesting a therapeutic target for wound repair.
Area of Science:
- Pharmacology
- Dermatology
- Regenerative Medicine
Background:
- Alpha2-adrenoceptors (α2-ARs) modulate the sympathetic nervous system and catecholamine release.
- Their specific role in cutaneous wound healing remains largely unexplored.
- Understanding α2-AR involvement could reveal novel therapeutic targets for skin repair.
Purpose of the Study:
- To investigate the role of α2A and α2C adrenoceptors in the process of cutaneous wound healing.
- To evaluate the impact of α2A/α2C-adrenoceptor deficiency on wound closure and associated cellular and molecular events.
Main Methods:
- Utilized α2A/α2C-adrenoceptor knockout and wild-type mice to create full-thickness skin excisional wounds.
- Assessed wound healing parameters including contraction, re-epithelialization, and inflammatory cell infiltration at 7 and 14 days post-wounding.
- Analyzed biochemical markers (nitrite, hydroxyproline) and protein expression (TGF-β, VEGF) in wound tissues.
- Evaluated fibroblast migration, α-smooth muscle actin expression, and collagen deposition in vitro.
Main Results:
- Depletion of α2A/α2C-adrenoceptors significantly accelerated wound contraction and re-epithelialization.
- Knockout mice showed reduced neutrophil and macrophage infiltration at wound sites.
- Enhanced levels of nitrite, hydroxyproline, TGF-β, and VEGF were observed in knockout mice.
- Accelerated angiogenesis and myofibroblast differentiation were noted in α2A/α2C-adrenoceptor deficient mice.
- In vitro studies confirmed enhanced migration, α-smooth muscle actin expression, and collagen deposition in fibroblasts from knockout mice.
Conclusions:
- Deletion of α2A/α2C-adrenoceptors promotes accelerated cutaneous wound healing in a murine model.
- The absence of these receptors enhances key processes like fibroblast activity, angiogenesis, and extracellular matrix deposition.
- Targeting α2A/α2C-adrenoceptors may represent a promising strategy for improving skin wound repair.
