Study of tissue inflammatory response in different mice strains infected by dematiaceous fungi Fonsecaea pedrosoi
An. bras. dermatol
; 94(1): 29-36, Jan.-Feb. 2019. graf
Article
em En
| LILACS
| ID: biblio-983752
Biblioteca responsável:
BR1.1
ABSTRACT
Abstract Background:
Diseases caused by melanized fungi include mycetoma, chromoblastomycosis and phaeohyphomycosis. This broad clinical spectrum depends on the dynamic interactions between etiologic agent and host. The immune status of the host influences on the development of the disease, as, an exemple. phaeohyphomicosis is more frequently observed in immunocompromised patients.Objectives:
Examine the histological inflammatory response induced by Fonsecaea pedrosoi in several different strains of mice (BALB/c, C57BL/6, Nude and SCID, and reconstituted Nude).Methods:
Fonsecaea pedrosoi was cultivated on agar gel and a fragment of this gel was implanted subcutaneously in the abdominal region of female adult mice. After infection has been obtained, tissue fragment was studied histopathologically.Results:
There were significant changes across the strains, with the nodular lesion more persistent in Nude and SCID mice, whereas in immunocompetent mice the lesion progressed to ulceration and healing. The histopathological analysis showed a significant acute inflammatory reaction which consisted mainly of neutrophils in the initial phase that was subsequently followed by a tuberculoid type granuloma in immunocompetent mice. Studylimitations:
There is no a suitable animal model for chromoblastomycosis.Conclusions:
The neutrophilic infiltration had an important role in the containment of infection to prevent fungal spreading, including in immunodeficient mice. The fungal elimination was dependent on T lymphocytes. The re-exposure of C57BL/6 mice to Fonsecaea pedrosoi caused a delay in resolving the infection, and appearance of muriform cells, which may indicate that re-exposure to fungi, might lead to chronicity of infection.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Ascomicetos
/
Dermatomicoses
/
Imunocompetência
/
Inflamação
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
An. bras. dermatol
Assunto da revista:
DERMATOLOGIA
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Brasil