Several native antigens have been evaluated, such as whole Neospora lysate antigen (NLA) [22], [29] and [35] and excreted-secreted antigens (NcESA) [29],

showing varied levels of protection of mice challenged with lethal dose of the parasite. In our previous study, we found that NLA combined with ODN-CpG adjuvant enhanced protection against N. caninum infection in mice, whereas immunization with NcESA resulted in a strong cellular immune response associated with high levels of IFN-γ and inflammation, rendering mice more susceptible to parasite challenge [29]. Recent studies have shown that protein vaccines with different delivery systems, such as chitosan-based nanogels GW786034 mouse (with or without mannosylated surfaces) [36] and oligomannose-coated liposomes [37], seem to be effective to control neosporosis in murine models. Therefore, in addition to the nature of antigen, the protective effect of vaccination also depends on the route of antigen, the delivery system and the type of adjuvant administered. In this

context, protein-carbohydrate recognition is essential to several intracellular processes, including the host-pathogen interaction and immune response [8]. Lectins have a potential role for this purpose, since they bind carbohydrates and could play an important task in the protection Alpelisib cell line against Leishmania spp and T. cruzi parasites [14], [15] and [16]. ArtinM, the d-mannose-binding lectin, is known to induce a Th1-biased immune response with production of IL-12 by macrophages [15] and induction of neutrophil activation, with release of inflammatory mediators and enhancement of their effector functions [38]. On the other almost hand, Jacalin, the d-galactose-binding lectin, was shown to be mitogenic for human CD4T lymphocytes [39] and, more recently, has demonstrated immunoregulatory actions as in HIV infection, where glycosylation-dependent

interactions of Jacalin with CD45 on CD4+ and CD8+ T cells elevated TCR-mediated signaling, inducing secretion of IL-2, which thereby up-regulated T cell activation and Th1/Th2 cytokine secretion [40]. In the present study, the immunization of mice using the ArtinM lectin as an adjuvant for NLA induced the production of higher levels of specific IgG antibodies by those animals, when compared to Jacalin lectin associated with NLA or NLA alone. After the vaccination protocols, the induced immune responses revealed a considerably higher adjuvant capacity of ArtinM than Jacalin, given that the former was able to increase the immunogenicity of NLA, demonstrated by high levels of specific total IgG, IgG1 and IgG2a antibodies. When comparing the IgG1 and IgG2a isotypes immediately before parasite challenge (60 d.a.i.