Low and high-dose intradermal infection with Leishmania majorand Leishmania amazonensis in C57BL/6 mice
Mem. Inst. Oswaldo Cruz
;
105(6): 736-745, Sept. 2010. ilus
Artigo
em Inglês
| LILACS
| ID: lil-560656
ABSTRACT
A model of skin infection with Leishmania amazonensiswith low doses of parasites is compared to infection with high doses of L. amazonensis and low and high doses of Leishmania major. C57BL/6 mice were infected with 10³ or 10(6) parasites in the ear and the outcome of infection was assessed. The appearance of lesions in mice infected with 10³ parasites was delayed compared to mice infected with 10(6) Leishmania and parasites were detectable at the infection site before lesions became apparent. Mice infected with L. amazonensisdisplayed persistent lesions, whereas infection with L. major spontaneously healed in all groups, although lymphocytes persisted at the site of infection after healing. Macrophages persisted only in L. amazonensis-infected mice. High-dose L. amazonensis-infected mice produced lower levels of IFN-γ and TNF than mice infected with L. major. No correlation between the persistence of parasites and IL-10 levels and the production of nitric oxide or urea by macrophages was found. We conclude that infection with low doses of L. amazonensisin the dermis changes the course of infection by delaying the appearance of lesions. However, low-dose infection does not change the outcomes of susceptibility and cytokine production described for subcutaneous infection with high numbers of parasites.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Leishmania mexicana
/
Linfócitos
/
Citocinas
/
Leishmaniose Cutânea
/
Leishmania major
/
Macrófagos
Tipo de estudo:
Estudo prognóstico
Limite:
Animais
Idioma:
Inglês
Revista:
Mem. Inst. Oswaldo Cruz
Assunto da revista:
Medicina Tropical
/
Parasitologia
Ano de publicação:
2010
Tipo de documento:
Artigo
/
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