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Erschienen in: Archives of Dermatological Research 1/2012

01.01.2012 | Original Paper

Analysis of the protective potential of antigens released by Leishmania (Viannia) shawi promastigotes

verfasst von: Luiz Felipe Domingues Passero, Cláudia Marques, Inês Vale-Gato, Carlos Eduardo Pereira Corbett, Márcia Dalastra Laurenti, Gabriela Santos-Gomes

Erschienen in: Archives of Dermatological Research | Ausgabe 1/2012

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Abstract

Leishmania (Viannia) shawi causes cutaneous lesions in humans. Parasite antigens conferring significant protection against American tegumentar leishmaniosis (ATL) might be important for the development of effective vaccine. Therefore, this work evaluates the protective effect of antigenic fractions released by L. shawi. Antigens released by promastigotes to culture medium were concentrated and isolated by SDS-PAGE. The three main fractions LsPass1 (>75 kDa), LsPass2 (75–50 kDa) and LsPass3 (<50 kDa) were electro-eluted according with their molecular mass. Immunized BALB/c mice were challenged with L. shawi promastigotes and the course of infection monitored during 5 weeks. LsPass1-challenged mice showed no protection, however, a strong degree of protection associated to smaller lesions and high expression of IFN-γ and TNF-α by CD4+ T, CD8+ T and double negative CD4CD8 cells was achieved in LsPass3-challenged mice. Furthermore, LsPass2-challenged mice showed an intermediated degree of protection associated to high levels of IFN-γ, IL-4 and IL-10 mRNA. In spite of increased expression of IFN-γ and TNF-α, high amounts of IL-4 and IL-10 mRNA were also detected in LsPass3-challenged mice indicating a possible contribution of these cytokines for the persistence of a residual number of parasites that may be important in inducing long-lasting immunity. Therefore, LsPass3 seems to be an interesting alternative that should be considered in the development of an effective vaccine against ATL.
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Metadaten
Titel
Analysis of the protective potential of antigens released by Leishmania (Viannia) shawi promastigotes
verfasst von
Luiz Felipe Domingues Passero
Cláudia Marques
Inês Vale-Gato
Carlos Eduardo Pereira Corbett
Márcia Dalastra Laurenti
Gabriela Santos-Gomes
Publikationsdatum
01.01.2012
Verlag
Springer-Verlag
Erschienen in
Archives of Dermatological Research / Ausgabe 1/2012
Print ISSN: 0340-3696
Elektronische ISSN: 1432-069X
DOI
https://doi.org/10.1007/s00403-011-1171-7

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