Curcuma purpurascens BI. rhizome accelerates rat excisional wound healing: involvement of Hsp70/Bax proteins, antioxidant defense, and angiogenesis activity
Authors Rouhollahi E, Moghadamtousi SZ, Hajiaghaalipour F, Zahedifard M, Tayeby F, Awang K, Abdulla M, Mohamed Z
Received 8 May 2015
Accepted for publication 18 June 2015
Published 27 October 2015 Volume 2015:9 Pages 5805—5813
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Rasika Samarasinghe
Peer reviewer comments 3
Editor who approved publication: Professor Shu-Feng Zhou
Elham Rouhollahi,1 Soheil Zorofchian Moghadamtousi,2 Fatemeh Hajiaghaalipour,3 Maryam Zahedifard,2 Faezeh Tayeby,2 Khalijah Awang,4 Mahmood Ameen Abdulla,3 Zahurin Mohamed1
1Pharmacogenomics Laboratory, Department of Pharmacology, Faculty of Medicine, 2Institute of Biological Sciences, Faculty of Science, 3Department of Biomedical Science, Faculty of Medicine, 4Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
Purpose: Curcuma purpurascens BI. is a member of Zingiberaceae family. The purpose of this study is to investigate the wound healing properties of hexane extract of C. purpurascens rhizome (HECP) against excisional wound healing in rats.
Materials and methods: Twenty four rats were randomly divided into 4 groups: A) negative control (blank placebo, acacia gum), B) low dose of HECP, C) high dose of HECP, and D) positive control, with 6 rats in each group. Full-thickness incisions (approximately 2.00 cm) were made on the neck area of each rat. Groups 1–4 were treated two-times a day for 20 days with blank placebo, HECP (100 mg/kg), HECP (200 mg/kg), and intrasite gel as a positive control, respectively. After 20 days, hematoxylin and eosin and Masson’s trichrome stainings were employed to investigate the histopathological alterations. Protein expressions of Bax and Hsp70 were examined in the wound tissues using immunohistochemistry analysis. In addition, levels of enzymatic antioxidants and malondialdehyde representing lipid peroxidation were measured in wound tissue homogenates.
Results: Macroscopic evaluation of wounds showed conspicuous elevation in wound contraction after topical administration of HECP at both doses. Moreover, histopathological analysis revealed noteworthy reduction in the scar width correlated with the enhanced collagen content and fibroblast cells, accompanied by a reduction of inflammatory cells in the granulation tissues. At the molecular level, HECP facilitates wound-healing process by downregulating Bax and upregulating Hsp70 protein at the wound site. The formation of new blood vessel was observed in Masson’s trichrome staining of wounds treated with HECP (100 and 200 mg/kg). In addition, HECP administration caused a significant surge in enzymatic antioxidant activities and a decline in lipid peroxidation.
Conclusion: These findings suggested that HECP accelerated wound-healing process in rats via antioxidant activity, angiogenesis effect and anti-inflammatory responses involving Hsp70/Bax.
Keywords: Zingiberaceae, wound closure, immunohistochemistry, antioxidant enzyme activity, inflammatory cells
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