The first two authors contributed equally to this work and should be considered joint first authors. The last two authors collaborated in the design of this study and were jointly responsible for overseeing this work.
Experimental dermatology • Original article
Oleanolic acid inhibits hypertrophic scarring in the rabbit ear model
Version of Record online: 11 MAR 2011
© The Author(s). CED © 2011 British Association of Dermatologists
Clinical and Experimental Dermatology
Volume 36, Issue 5, pages 528–533, July 2011
How to Cite
Wei, Y.-J., Yan, X.-Q., Ma, L., Wu, J.-G., Zhang, H. and Qin, L.-P. (2011), Oleanolic acid inhibits hypertrophic scarring in the rabbit ear model. Clinical and Experimental Dermatology, 36: 528–533. doi: 10.1111/j.1365-2230.2010.04012.x
Conflict of interest: none declared.
- Issue online: 17 JUN 2011
- Version of Record online: 11 MAR 2011
- Accepted for publication 20 October 2010
Background. Hypertrophic scarring, a common proliferative disorder of dermal fibroblasts, results from an overproduction of collagen and excessive deposition of extracellular matrix. Although treatment with surgical excision or steroid hormones can modify the symptoms, numerous treatment-related complications have been described.
Aim. To investigate the effects of oleanolic acid (OA), a naturally occurring triterpenoid, on hypertrophic scarring in a rabbit ear model.
Methods. A rabbit ear model of hypertrophic scarring was used, with wounds produced with a biopsy punch. Oleanolic acid (2.5%, 5% and 10%) was applied once daily to the scars for 22 days. On postoperative day 28, the scars were excised, and the tissue used for histological examination and assays of the levels of collagens I and III, matrix metalloproteinase (MMP)-1 and transforming growth factor (TGF)-β1. The scar elevation index (SEI) was also determined.
Results. Treatment with different concentrations of oleanolic acid (OA) for 22 days significantly inhibited hypertrophic scarring in rabbit ear tissue. Levels of TGF-β1, collagen I and collagen III were significantly decreased and levels of MMP-1 significantly increased in the scar tissue. SEI was also significantly reduced. Histological findings showed significant amelioration of the scar tissue.
Conclusions. OA suppresses hypertrophic scarring in the rabbit ear model and may be an effective cure for human hypertrophic scarring.