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- Title
LBSapSal-vaccinated dogs exhibit increased circulating T-lymphocyte subsets (CD4+ and CD8+) as well as a reduction of parasitism after challenge with Leishmania infantum plus salivary gland of Lutzomyia longipalpis.
- Authors
de Oliveira Aguiar-Soares, Rodrigo Dian; Mendes Roatt, Bruno; Gama Ker, Henrique; das Dores Moreira, Nádia; Siqueira Mathias, Fernando Augusto; de Oliveira Cardoso, Jamille Mirelle; Figueiredo Gontijo, Nelder; Bruna-Romero, Oscar; Teixeira-Carvalho, Andréa; Martins-Filho, Olindo Assis; Corrêa-Oliveira, Rodrigo; Cordeiro Giunchetti, Rodolfo; Barbosa Reis, Alexandre
- Abstract
Background The development of a protective vaccine against canine visceral leishmaniasis (CVL) is an alternative approach for interrupting the domestic cycle of Leishmania infantum. Given the importance of sand fly salivary proteins as potent immunogens obligatorily co-deposited during transmission of Leishmania parasites, their inclusion in an anti-Leishmania vaccine has been investigated in the last few decades. In this context, we previously immunized dogs with a vaccine composed of L. braziliensis antigens plus saponin as the adjuvant and sand fly salivary gland extract (LBSapSal vaccine). This vaccine elicited an increase in both antisaliva and anti-Leishmania IgG isotypes, higher counts of specific circulating CD8+ T cells, and high NO production. Methods We investigated the immunogenicity and protective effect of LBSapSal vaccination after intradermal challenge with 1 × 107 late-log-phase L. infantum promastigotes in the presence of sand fly saliva of Lutzomyia longipalpis. The dogs were followed for up to 885 days after challenge. Results The LBSapSal vaccine presents extensive antigenic diversity with persistent humoral and cellular immune responses, indicating resistance against CVL is triggered by high levels of total IgG and its subtypes (IgG1 and IgG2); expansion of circulating CD5+, CD4+, and CD8+ T lymphocytes and is Leishmania-specific; and reduction of splenic parasite load. Conclusions These results encourage further study of vaccine strategies addressing Leishmania antigens in combination with proteins present in the saliva of the vector.
- Subjects
SAND flies; PARASITISM; LYMPHOCYTES; T cells; PARASITES; LEISHMANIA infantum; LUTZOMYIA
- Publication
Parasites & Vectors, 2014, Vol 7, Issue 1, p1
- ISSN
1756-3305
- Publication type
Article
- DOI
10.1186/1756-3305-7-61