title: ArtinM, a D-mannose-binding lectin from Artocarpus integrifolia, plays a potent adjuvant and immunostimulatory role in immunization against Neospora caninum.
abstract: ArtinM and Jacalin (JAC) are lectins from the jackfruit (Artocarpus integrifolia) that have important role in modulation of immune responses to pathogens. Neospora caninum is an Apicomplexa parasite that causes neuromuscular disease in dogs and reproductive disorders in cattle, with economic impact on the livestock industry. Hence, we evaluated the adjuvant effect of ArtinM and JAC in immunization of mice against neosporosis. Six C57BL/6 mouse groups were subcutaneously immunized three times at 2-week intervals with Neospora lysate antigen (NLA) associated with lectins (NLA+ArtinM and NLA+JAC), NLA, ArtinM and JAC alone, and PBS (infection control). Animals were challenged with lethal dose of Nc-1 isolate and evaluated for morbidity, mortality, specific antibody response, cytokine production by spleen cells, brain parasite burden and inflammation. Our results demonstrated that ArtinM was able to increase NLA immunogenicity, inducing the highest levels of specific total IgG and IgG2a/IgG1 ratio, ex vivo Th1 cytokine production, increased survival, the lowest brain parasite burden, along with the highest inflammation scores. In contrast, NLA+JAC immunized group showed intermediate survival, the highest brain parasite burden and the lowest inflammation scores. In conclusion, ArtinM presents stronger immunostimulatory and adjuvant effect than Jacalin in immunization of mice against neosporosis, by inducing a protective Th1-biased pro-inflammatory immune response and higher protection after parasite challenge.
authors: Laboratory of Immunoparasitology, Institute of Biomedical Sciences, Federal University of Uberlândia, Av. Pará 1720, 38400-902 Uberlândia, MG, Brazil.
authors: Mariana R D
authors: MR
authors: Cardoso
authors: Caroline M
authors: CM
authors: Mota
authors: Dâmaso P
authors: DP
authors: Ribeiro
authors: Fernanda M
authors: FM
authors: Santiago
authors: Julianne V
authors: JV
authors: Carvalho
authors: Ester C B
authors: EC
authors: Araujo
authors: Neide M
authors: NM
authors: Silva
authors: Tiago W P
authors: TW
authors: Mineo
authors: Maria C
authors: MC
authors: Roque-Barreira
authors: José R
authors: JR
authors: Mineo
authors: Deise A O
authors: DA
authors: Silva
mesh_terms: D000276:Adjuvants, Immunologic / Q000494:pharmacology*; D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood / Q000276:immunology; D031622:Artocarpus / Q000737:chemistry; D001921:Brain / Q000469:parasitology; D003048:Coccidiosis / Q000276:immunology / Q000517:prevention & control*; D016207:Cytokines / Q000276:immunology; D005260:Female; D007114:Immunization; D007074:Immunoglobulin G / Q000097:blood / Q000276:immunology; D037241:Mannose-Binding Lectins / Q000276:immunology / Q000494:pharmacology*; D051379:Mice; D008810:Mice, Inbred C57BL; D018688:Neospora / Q000472:pathogenicity*; D059208:Parasite Load; D037121:Plant Lectins / Q000276:immunology / Q000494:pharmacology*; D013154:Spleen / Q000166:cytology / Q000276:immunology
chemical_list: D000276:Adjuvants, Immunologic; D000913:Antibodies, Protozoan; D016207:Cytokines; D007074:Immunoglobulin G; D037241:Mannose-Binding Lectins; D037121:Plant Lectins; C043696:jacalin