Document Detail

Metabolic extract of Fusarium oxysporum induces histopathologic alterations and apoptosis in the skin of Wistar rats.
MedLine Citation:
PMID:  19570074     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Most patients with Fusarium infection present with affection of the tegumentary system, with the presence of necrotic and/or inflammatory lesions associated with pain. AIM: To evaluate the effect of the intradermal application of a metabolic extract of Fusarium oxysporum in the skin of Wistar rats. METHODS: The extract was obtained from fungal cultivation in Czapek-Dox medium. It was sterilized by filtration through a Millipore membrane, and injected (0.5 mg/mL) intradermally into the skin of rats, which were killed 3, 6, 12, and 24 h after inoculation. Skin specimens were placed in paraffin and stained using hematoxylin and eosin, and toluidine blue, for the evaluation of the inflammatory response, and Sirius red for the quantification of collagen. Terminal deoxynucleotidyl transferase-mediated UTP nick end labelling (TUNEL) was used for the identification of apoptosis. Tissue reactions were graded and compared over time and compartment. RESULTS: The inflammatory reaction reached a peak at 12 h for both the dermis and subcutaneous region, being graded as moderate and moderate to severe, respectively. There was an influx of granulocytes, lymphocytes, and macrophages. A significant increase in the number of mast cells, as well as the presence of hyperemic vessels and apoptotic bodies, was observed. There was TUNEL staining in keratinocytes, fibroblasts, endothelial cells, muscles, and in the cells of the inflammatory infiltrate. There was a significant decrease in the area occupied by collagen after 12 h. CONCLUSIONS: The extract induced histopathologic alterations in the skin, probably as a result of the presence of active toxic metabolites.
Aline Vansan Marangon; Terezinha Inez Estivalet Svidzinski; Tânia Pereira Salci; Rosalva Meurer; Marilda da Cruz Fernandes; Luzmarina Hernandes
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of dermatology     Volume:  48     ISSN:  1365-4632     ISO Abbreviation:  Int. J. Dermatol.     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-07-02     Completed Date:  2009-09-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0243704     Medline TA:  Int J Dermatol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  697-703     Citation Subset:  IM    
Departamento de Ciências Morfofisiológicas, Universidade Estadual de Maringá, Paraná, Brazil.
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MeSH Terms
Collagen Type I / metabolism
Collagen Type III / metabolism
Dermis / immunology,  pathology*
Disease Models, Animal
Fusarium / metabolism*
In Situ Nick-End Labeling
Injections, Intradermal
Mast Cells / immunology,  microbiology,  pathology
Mycoses / immunology,  microbiology*,  pathology*
Mycotoxins / toxicity*
Rats, Wistar
Reg. No./Substance:
0/Collagen Type I; 0/Collagen Type III; 0/Mycotoxins

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