• Janghoon Ahn, Seong-Gon Kim, Min-Keun Kim, Dae-Won Kim, Jang-Ha Lee, Hyun Seok, and Je-Yong Choi.
• Department of Dentistry, College of Medicine, Hallym University, Chuncheon, Republic of Korea.
• Burns. 2016 Nov 1; 42 (7): 1534-1541.

ObjectiveThe objective of this study was to evaluate (1) the effect of 4-hexylresorcinol (4HR) application on TNF-α expression in RAW264.7 cells and (2) the effect of 4HR ointment on burn wound healing in a rat burn wound model.Materials And MethodsRAW264.7 cells were cultured in the presence of different concentrations of 4HR, and the attached cells were sampled for western blot analysis at each time point. Animal studies were conducted on male Wistar rats (n=24). Three treatment groups were evaluated in this study: (1) treatment with ointment alone (negative control), (2) treatment with ointment containing 0.2wt% 4HR, and (3) treatment with ointment containing 2wt% 4HR. For the assessment of wound healing, digital photographs were taken at 1, 5, and 14 days. Animals were sacrificed at 1, 5, and 14 days for histological examination or ELISA analysis.ResultsWestern blot analysis showed that TNF-α protein levels were reduced following treatment with 4HR at concentrations between 1 and 10μg/mL. In animal studies, the average denuded area 14 days after burn was smaller in the 2wt% 4HR treatment group compared with the control group (P=0.022). Immunohistochemical analysis revealed lower TNF-α expression in the 2wt% 4HR treatment group compared with the control group 14 days after burn (P=0.027).Conclusion4HR reduced TNF-α expression in RAW264.7 cells and in the burn wounds of rats. Burn wounds dressed with ointment containing 4HR also exhibited rapid epithelization and collagen regeneration.Copyright © 2016 Elsevier Ltd and ISBI. All rights reserved.

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