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Partial Protective Effect of Intranasal Immunization with Recombinant Toxoplasma gondii Rhoptry Protein 17 against Toxoplasmosis in Mice
- Source :
- PLoS ONE, PLoS ONE, Vol 9, Iss 9, p e108377 (2014)
- Publication Year :
- 2014
- Publisher :
- Public Library of Science (PLoS), 2014.
-
Abstract
- Toxoplasma gondii (T. gondii) is an obligate intracellular protozoan parasite that infects a variety of mammals, including humans. An effective vaccine for this parasite is therefore needed. In this study, RH strain T. gondii rhoptry protein 17 was expressed in bacteria as a fusion with glutathione S-transferase (GST) and the recombinant proteins (rTgROP17) were purified via GST-affinity chromatography. BALB/c mice were nasally immunised with rTgROP17, and induction of immune responses and protection against chronic and lethal T. gondii infections were investigated. The results revealed that mice immunised with rTgROP17 produced high levels of specific anti-rTgROP17 IgGs and a mixed IgG1/IgG2a response of IgG2a predominance. The systemic immune response was associated with increased production of Th1 (IFN-γand IL-2) and Th2 (IL-4) cytokines, and enhanced lymphoproliferation (stimulation index, SI) in the mice immunised with rTgROP17. Strong mucosal immune responses with increased secretion of TgROP17-specific secretory IgA (SIgA) in nasal, vaginal and intestinal washes were also observed in these mice. The vaccinated mice displayed apparent protection against chronic RH strain infection as evidenced by their lower liver and brain parasite burdens (59.17% and 49.08%, respectively) than those of the controls. The vaccinated mice also exhibited significant protection against lethal infection of the virulent RH strain (survival increased by 50%) compared to the controls. Our data demonstrate that rTgROP17 can trigger strong systemic and mucosal immune responses against T. gondii and that ROP17 is a promising candidate vaccine for toxoplasmosis.
- Subjects :
- Immunoglobulin A
Protozoan Proteins
lcsh:Medicine
Antibodies, Protozoan
Antigens, Protozoan
Lymphocyte Activation
Immunoglobulin G
Mice
Immune system
Antigen
parasitic diseases
Medicine and Health Sciences
Parasitic Diseases
medicine
Animals
Lymphocytes
lcsh:Science
Administration, Intranasal
Protozoan Infections
Multidisciplinary
Rhoptry
biology
lcsh:R
Toxoplasma gondii
biology.organism_classification
medicine.disease
Recombinant Proteins
Toxoplasmosis
Toxoplasmosis, Animal
Immunology
biology.protein
Cytokines
lcsh:Q
Female
Immunization
Antibody
Toxoplasma
Research Article
Subjects
Details
- ISSN :
- 19326203
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- PLoS ONE
- Accession number :
- edsair.doi.dedup.....3a3d2d0174356148869c213ddcd884d7