Comparative study of protective activities of Neospora caninum bradyzoite antigens, NcBAG1, NcBSR4, NcMAG1, and NcSAG4, in a mouse model of acute parasitic infection
| Autor: | Soichi Imai, Masaki Uchida, Akira Ito, Kazunori Ike, Kotomi Nagashima, Takashi Murakami, Yui Akatsuka |
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| Rok vydání: | 2012 |
| Předmět: |
Protozoan Vaccines
Momordica charantia medicine.medical_treatment Bitter gourd Antibodies Protozoan Antigens Protozoan Biology Parasite load Parasite Load Interferon-gamma Mice Immune system Adjuvants Immunologic Antigen parasitic diseases medicine Animals Mice Inbred BALB C General Veterinary Coccidiosis Plant Extracts Immunogenicity Neospora Brain General Medicine biology.organism_classification Survival Analysis Virology Neospora caninum Vaccination Disease Models Animal Infectious Diseases Immunoglobulin G Insect Science Immunology Leukocytes Mononuclear Female Parasitology Adjuvant Spleen |
| Zdroj: | Parasitology Research. 112:655-663 |
| ISSN: | 1432-1955 0932-0113 |
| DOI: | 10.1007/s00436-012-3182-5 |
| Popis: | Neospora caninum is an obligate intracellular protozoan parasite that causes severe neuromuscular diseases, repeated abortion, stillbirth, and congenital infection in livestock and companion animals. The development of an effective vaccine against neosporosis in cattle is an important issue due to the significant worldwide economic impact of this disease. We evaluated the immunogenicity of four bradyzoite antigens, NcBAG1 (first described in this study), NcBSR4, NcMAG1, and NcSAG4, using an acute infection mouse model to determine synergistic effects with the tachyzoite antigen as a candidate for vaccine production. Mice were inoculated with the recombinant vaccines (r-)NcBAG1, rNcBSR4, rNcMAG1, rNcSAG4, or phosphate-buffered saline (PBS) (adjuvant control group) in an oil-in-water emulsion with bitter gourd extract, a Th1 immune stimulator, or PBS alone as the infection control group. Mice inoculated with each vaccine developed antigen-specific IgG1 and IgG2a antibodies and isolated splenocytes from mice produced high levels of interferon-γ when infected with the N. caninum tachyzoite. The mice inoculated with rNcBAG1, rNcMAG1, or rNcSAG4 developed slight to moderate clinical symptoms but did not succumb to infection. In contrast, rNcBSR4 and both control groups developed severe disease and some mice required euthanasia. The parasitic burden in the brain tissues of vaccinated mice was assessed by N. caninum-specific real-time PCR at 5 weeks after infection. The parasite load in rNcBAG1-, rNcMAG1-, and rNcSAG4-inoculated mice was significantly lower than that in adjuvant and infection control mice. Therefore, these antigens may be useful for the production of a N. caninum-specific vaccination protocol. |
| Databáze: | OpenAIRE |
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