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A recombinant fusion protein displaying murine and human MHC class I- and II-specific epitopes protects against Leishmania amazonensis infection.

Abstract：

:Tegumentary leishmaniasis (TL) constitutes a major public health problem with significant morbidity worldwide. Synthetic peptide-based vaccines are attractive candidates to protect against leishmaniasis, since T cell-specific epitopes can be delivery to antigen-presenting cells, leading to the generation of a Th1 cell-mediated immunity. In this context, the present study aims to evaluate the immunogenicity and protective efficacy of a vaccine composed of major histocompatibility complex class I and II-restricted epitopes derived from four Leishmania infantum proteins to protect mice against Leishmania amazonensis infection. This recombinant fusion protein was administered in BALB/c mice alone or with saponin. As controls, animals received saline or saponin. In the results, the administration of the recombinant protein plus saponin induced a specific IFN-γ, IL-12 and GM-CSF production, as well as high IgG2a isotype antibody levels, which protected mice against a challenge using L. amazonensis promastigotes. Lower parasite burden was found in the infected footpads, liver, spleen and draining lymph node of vaccinated mice, when compared to those from the control groups. In addition, protection was associated with a lower IL-4 and IL-10 response, which was accompanied by the antileishmanial nitrite production by spleen cells of the animals. Interestingly, the recombinant protein administered alone induced a partial protection against challenge. In conclusion, this study shows a new vaccine candidate based on T cell-specific epitopes that was able to induce protection against L. amazonensis infection.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Martins VT,Lage DP,Duarte MC,Carvalho AM,Costa LE,Mendes TA,Vale DL,Menezes-Souza D,Roatt BM,Tavares CA,Soto M,Coelho EA

doi

10.1016/j.cellimm.2016.12.008

subject

Has Abstract

pub_date

2017-03-01 00:00:00

pages

32-42

eissn

0008-8749

issn

1090-2163

pii

S0008-8749(16)30163-0

journal_volume

313

pub_type

杂志文章

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