Thermal Burn Wounds Produce Greater Scars Compared to Similarly Sized Excisional Wounds And Topical Amiloride Applied to Burn-Induced Scars Shows Scar Reduction
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Keywords
burn, excision, scar, amiloride, celecoxib
Abstract
Background: Victims of severe traumatic injuries such as large surface area lacerations and thermal burns require substantial medical care that primarily promotes healing. And although this care is essential, there is a lack of pharmacological treatments that reduce the resulting scars, consequently leaving many traumatic victims with profusely disfigured skin.
Methods: A rabbit-ear injury model was used to compare scar progression in adjacently paired contact thermal burns (n=24) and excisional wounds (n=16). Once that model revealed significant differences in scar hypertrophy between these two types of injuries, a succeeding study involved solely inducing burns, with the resulting wounds undergoing scar elevation index (SEI) and gene expression analysis after unilateral topical treatment with either amiloride (n=12), celecoxib (n=11) or contralateral vehicle control (n=10 for each of the two control groups).
Results: In the initial burn and excisional wound comparison study, thermal burns showed significantly larger scars, both in scar height measured at four timepoints (P<0.0001, <0.01, <0.05, and <0.05) and histologically by analyzing the SEI (P<0.05). In the succeeding project, burn-induced scars treated with amiloride also demonstrated a significantly reduced histological SEI (P<0.05) compared to scars receiving vehicle control. However, relative PTGS2, ACTA2 and COL1A1 expression was not significantly different in scar tissues treated with amiloride compared to those receiving vehicle control. Also, no significant differences in SEI were determined in scars treated with celecoxib compared to vehicle control
Conclusions: Contact thermal burn injuries create profusive hypertrophic scars compared to similarly sized excisional wounds. Topical application of amiloride to burn-induced scars reduce scar formation, yet this finding necessitates further studies to comprehend the mechanism behind its scar-reducing effect.
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