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Anti-inflammatory and cicatrizing activities of thymol, a monoterpene of the essential oil from Lippia gracilis, in rodents.
MedLine Citation:
PMID:  22885071     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
ETHNOPHARMACOLOGICAL RELEVANCE: Lippia gracilis Schauer (Verbenaceae) has long been recognized in folk medicine as a medicinal plant. The essential oil of Lippia gracilis has antimicrobial activity and is used externally to treat cutaneous diseases, burns, wounds, and ulcers. Recently, our research group demonstrated that the essential oil of Lippia gracilis leaves possesses antinociceptive and anti-inflammatory actions and its major component identified was thymol. The objective of this study was to assess the anti-inflammatory and wound healing activities of thymol in rodents. MATERIALS AND METHODS: For the anti-inflammatory analysis the paw oedema and peritonitis models were used, followed by the assessment of the mieloperoxidase (MPO) activity, total cell counting, and histological analysis. The animals were treated (i.p., n=6/group) with thymol (10, 30, and 100mg/kg), dexamethasone (2mg/kg), or vehicle (1% Tween 80). In order to assess the wound healing potential, thymol was vehiculated into collagen-based dressing films and a biological wound healing test was conducted. The retraction index of the wounds and histological analysis were performed on the 3rd, 7th, 14th, and 21th days, split into three groups: undressed wounds (CTR), dressed with collagen-based films (COL), and dressed with collagen-based containing thymol (COLTHY) films. RESULTS: Thymol reduced significantly the oedema (100mg/kg, P<0.001) and, besides, diminished the influx of leukocytes to the injured area (10, 30, and 100mg/kg), according to the assessment of MPO activity (P<0.001), total cell count (P<0.05), and histological analysis. Wounds dressed with COLTHY films showed significantly bigger wound retraction rates (7 and 14 day, P<0.05) and improved the granulation reaction, as well provided better collagenization density and arrangement during wound healing. CONCLUSIONS: This study suggests that thymol is a promising compound to be used in treatment of inflammatory processes as well as wound healing. The pharmacological actions of Lippia gracilis in popular medicine practices may be related, at least in part, to the presence of thymol in the essential oil.
Authors:
K R Riella; R R Marinho; J S Santos; R N Pereira-Filho; J C Cardoso; R L C Albuquerque-Junior; S M Thomazzi
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-31
Journal Detail:
Title:  Journal of ethnopharmacology     Volume:  -     ISSN:  1872-7573     ISO Abbreviation:  J Ethnopharmacol     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-8-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7903310     Medline TA:  J Ethnopharmacol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Ireland Ltd.
Affiliation:
Departamento de Fisiologia, Universidade Federal de Sergipe, Av. Marechal Rondon, s/n Cidade Universitária, CEP 49100-000 São Cristóvão, Sergipe, Brazil.
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