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PHD : Parasites, Hosts and Diseases

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Original Article

DNA Vaccines Encoding Toxoplasma gondii Cathepsin C 1 Induce Protection against Toxoplasmosis in Mice

The Korean Journal of Parasitology 2017;55(5):505-512.
Published online: October 31, 2017

1Department of Parasitology, Shandong University School of Medicine, Jinan, Shandong, 250012, P. R. 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2Department of Pediatrics, Provincial Hospital Affiliated to Shandong University, Shandong University School of Medicine, Jinan, Shandong, 250021, P. R. 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*Corresponding author (shenyi.he@hotmail.com)
• Received: March 4, 2017   • Revised: September 14, 2017   • Accepted: September 19, 2017

Copyright © 2017 by The Korean Society for Parasitology and Tropical Medicine

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Toxoplasma gondii cathepsin C proteases (TgCPC1, 2, and 3) are important for the growth and survival of T. gondii. In the present study, B-cell and T-cell epitopes of TgCPC1 were predicted using DNAstar and the Immune Epitope Database. A TgCPC1 DNA vaccine was constructed, and its ability to induce protective immune responses against toxoplasmosis in BALB/c mice was evaluated in the presence or absence of the adjuvant α-GalCer. As results, TgCPC1 DNA vaccine with or without adjuvant α-GalCer showed higher levels of IgG and IgG2a in the serum, as well as IL-2 and IFN-γ in the spleen compared to controls (PBS, pEGFP-C1, and α-Galcer). Upon challenge infection with tachyzoites of T. gondii (RH), pCPC1/α-Galcer immunized mice showed the longest survival among all the groups. Mice vaccinated with DNA vaccine without adjuvant (pCPC1) showed better protective immunity compared to other controls (PBS, pEGFP-C1, and α-Galcer). These results indicate that a DNA vaccine encoding TgCPC1 is a potential vaccine candidate against toxoplasmosis.
Toxoplasma gondii is an obligate intracellular protozoan parasite that causes zoonotic toxoplasmosis [1,2], which poses a serious risk to animal husbandry and human health [3]. T. gondii strains are classed as virulent or weak depending on their strength of toxicity. Host infections of virulent strains can cause acute disease and even death, while infections with attenuated strains show no obvious symptoms but can lead to cyst formation in some hosts. The RH strain is representative of virulent strains [1,2].
Human toxoplasmosis may cause serious clinical manifestations in the fetus and in immunocompromised individuals [4,5]. Infection of pregnant woman with T. gondii sometimes results in premature birth, stillbirth, miscarriage, fetal brain hydrocephalus, cerebellar malformations, and other issues [6]. The current primary strategy for the treatment of toxoplasmosis is chemical drugs, but these often cause side effects, especially in the fetus, and have no effect on cysts or bradyzoites [7]. In recent decades, progress has been made in the development of vaccines against T. gondii infection, and it is hoped that DNA vaccines could be used to eliminate this parasite [8,9].
Cysteine proteases are important for apicomplexan invasion, organellar biogenesis, and intracellular survival [10]. Five cathepsin proteins belonging to cysteine proteases are encoded by the T. gondii genome; 1 cathepsin B (TgCPB), 1 cathepsin L (TgCPL), and 3 cathepsin C (TgCPC1, 2, and 3) proteases [10,11]. Cathepsin C proteases are exopeptidases that are required for T. gondii tachyzoite growth and differentiation. Inhibition of these proteases leads to significant attenuation of infection by T. gondii [10]. TgCPC1 and TgCPC2 are expressed in tachyzoites, and have been reported to occupy dense granules and the parasitophorous vacuole (PV) of tachyzoites during T. gondii replication. The PV is formed as the parasite invades the host cell. At least one of TgCPC1 or TgCPC2 is required for host cell invasion and growth, but TgCPC3 has not been detected in the tachyzoites of T. gondii [10,11]. TgCPC1 is expressed at high levels and is the most abundant thiol protease in T. gondii tachyzoites. Indeed, TgCPC1 mRNA levels were estimated to exceed 60% of total cathepsin mRNA levels, with TgCPC1 transcript levels around 20 times higher than those of TgCPC2 [10].
In immunology, the choice of adjuvant is a key factor in determining the effectiveness of the immune response [12]. Studies have demonstrated that α-GalCer is a strong natural killer T agonist that plays a major role in the stimulation of natural killer T cells [1315]. In some researches α-GalCer has also been used as an adjuvant in vaccine development, and was shown to make a positive contribution [16,17].
Epitopes are chemical groups that determine antigen specificity. Predicting the epitopes is of great value for design of immunogenicity of peptides and new vaccines [18]. In the present study, we analyzed the CPC1 protein using a bioinformatics approach to identify potential antigenic epitopes, and constructed a TgCPC1 DNA vaccine to evaluate protective immune responses against toxoplasmosis in BALB/c mice. We show that TgCPC1 is a novel vaccine candidate that induces clear humoral and cellular immune responses against T. gondii infections in mice. Furthermore, α-GalCer used as an adjuvant enhanced the immune responses.
Prediction of linear B-cell epitopes and T-cell epitopes
TgCPC1 nucleotide (GenBank no. DQ063593.1) and amino acid sequences (GenBank no. AAZ15654.1) were obtained from GenBank. Epitopes that consist of chemical groups form the basis of protein antigenicity and determine antigen specificity [19,20]. We analyzed hydrophilicity plots, flexible regions, the antigenic index, and the surface probability of CPC1 and predicted linear B cell epitopes of CPC1 using DNASTAR software. Given the important role of T-cell epitopes in immunity against intracellular parasites, we used the Immune Epitope Database (IEDB; http://tools.immuneepitope.org/mhcii) online service to analyze T-cell epitopes of CPC1. The half maximal inhibitory concentration (IC50) values of peptides binding to the major histocompatibility complex (MHC) class II molecules of CPC1 were predicted using the online service.
Animals and parasites
Seven- to 8-week-old female BALB/c mice were obtained from Shandong University Laboratory Animal Center (Jinan, Shandong, China). Mice were bred under specific pathogen-free conditions, with food and water ad libitum. All animal experiments were approved by the Ethics Committee on Animal Experiments of the Medical School of Shandong University.
T. gondii RH strain tachyzoites were extracted from human foreskin fibroblasts 1 hr before injection to ensure maximal freshness prior to challenge. Tachyzoites were used to produce soluble tachyzoite antigens (STAg) after digesting by 0.25 %-trypsin, isolating by centrifugation, suspending in sterile PBS, sonicated for 10 min periods at 300 w/s twice, freezing and thawing at −20°C (3 times) and centrifuging (10,000 rpm) for 30 min. Collected STAg was stored at −80°C before use. Total RNA was extracted from about 8×106 tachyzoites using TRIzol reagent (Life Technologies, Carlsbad, California, USA) and reverse-transcribed into cDNA with RevertAid First Strand cDNA Synthesis Kit according to the manufacturer’s protocol (Thermo Scientific, Carlsbad, California, USA).
Construction and preparation of plasmids
The entire coding sequence of the T. gondii CPC1 gene was amplified using PCR from T. gondii cDNA with synthetic primers: forward primer, 5′-CGAGCTCAAATGGGGTCGCT GCG-CAGGCGGT-3′; reverse primer, 5′-CGGGGTACCTCACATT-GTTTTACTTTTCAGAGC -3′ (introducing Sac I and Kpn I restriction sites, respectively, as shown by underlining). Trans TagTM High Fidelity DNA Polymerase (TransGen Biotech, Beijing, China) was used in PCR amplification.
PCR products were inserted into the pEASY-T1 Vector (TransGen Biotech), digested with the appropriate restriction enzyme, and purified from agarose gels. The CPC1 gene fragment was then subcloned into the eukaryotic expression plasmid pEGFP-C1 (Novagen, Billerica, Massachusetts, USA) to form pEGFP-C1-CPC1 (pCPC1). Recombinant plasmids were propagated in Escherichia coli DH5α cells and identified using PCR, restriction analysis and sequencing. Endotoxin-free plasmids were then obtained by Endofree Plasmid Mega kits (Qiagen, Hilden, Germany) following the manufacturer’s instructions. The concentrations of the plasmids were assessed using A260/A280 measurement. All plasmids were diluted to 1 mg/ml with sterile endotoxin-free PBS and stored at −20°C until use.
pCPC1 expression in human embryonic kidney (HEK) 293-T cells
HEK 293-T cells were cultivated in Dulbecco’s modified Eagle medium (DMEM) with streptomycin (100 mg/ml), penicillin (100 IU/ml), and 10% fetal bovine serum. The cells were maintained at 37°C in a humidified atmosphere with 5% CO2. HEK293 cells (about 1–2×105/well) were plated in Costar 6-well culture plates (Sigma-Aldrich, St. Louis, Missouri, USA) before transfection.
HEK 293-T cells were transfected by control blank, pEGFP-C1, and recombinant eukaryotic expression plasmids pCPC1 using lipofectamine 2000 reagent (Invitrogen, Carlsbad, California, USA) according to the manufacturer’s instructions. Briefly, 7 μl/well lipofectamine was mixed with plasmids (2.5 μg/well) in DMEM, and incubated at room temperature for 20 min. The mixture was then added drop by drop to HEK 293-T cells. After 6 hr incubation, the cell culture medium was replaced by fresh complete medium. After a further incubation of 48 hr, cells were analyzed by fluorescence microscopy with a blue laser.
Immunization and challenge of mice
Female BALB/c mice were randomly divided into 5 groups (15 mice per group). Mice were immunized intramuscularly twice in their hind legs at 2-week intervals with PBS (100 μl), pEGFP-C1 (100 μg), pCPC1 (100 μg), α-GalCer (2 μg), or pCPC1 (100 μg)/α-GalCer (2 μg). α-GalCer was only injected at the final immunization, while other components were injected a total of 3 times [17]. Immunization schedules of BALB/c mice are shown in Fig. 1. Serum samples were collected from all mice prior to each immunization and 2 weeks after the final injection.
Two weeks after the final injection, spleens of 5 mice per group were obtained under aseptic conditions. Ten mice from each group were challenged intraperitoneally using 1×104 tachyzoites of T. gondii RH strain. The number of survival days of the mice challenged with RH strain was recorded.
Antibody detection
ELISA was used to assess antibody levels of T. gondii-specific serum IgG, IgG1, and IgG2a. Briefly, 96-well plates (Costar) were incubated with STAg in 50 mM carbonate buffer (pH 9.6) at 4°C overnight. The treated plates were washed 3 times and sealed by 1% bovine serum albumin for 2 hr at room temperature. The collected sera were diluted with PBS, added to the prepared plates, and incubated for 1 hr at 37°C. Plates were then washed and treated with horseradish peroxidase-conjugated, goat anti-mouse IgG, IgG1, or IgG2a. After washing again, the mixture was visualized by incubating with o-phenylenediamine dihydrochloride solution and 0.15% H2O2. The reaction was interrupted by adding 2 M H2SO4. Lastly, ELX800 ELISA reader (BioTek, Winooski, Vermont, USA) was used to detect the optical density (OD) at 490 nm. All samples were run 3 times. The cut-off value was calculated as mean OD+ 3SD, where the mean OD and SD were from the sera of PBS-injected mice. The serum is considered positive when the OD>the cut-off value [21].
Cytokine detection
Two weeks after the last injection, spleens were collected from 5 mice per group to assess the levels of cytokines. Spleen cells were obtained and cultivated in 96-well plates at 37°C with 5% CO2. Cell-free supernatants were collected and used to detect IL-2 and IL-4 levels at 24 hr, IL-10 levels at 72 hr, and IFN-γ levels at 96 hr using commercial ELISA kits according to the manufacturer’s instructions (R&D Systems, Minneapolis, Minnesota, USA). All samples were run 3 times.
Statistical analysis
SPSS 17.0 software (IBM, Chicago, Illinois, USA) was used to carry out statistical analysis. Antibody levels and cytokine levels were analyzed by one-way analysis of variance. Mouse survival time was compared using the Kaplan–Meier method. Tukey’s studentized range test was used for post-test comparisons. Differences were considered statistically significant if P <0.05.
Ethics statement
This study was approved by the Institutional Animal Care and Use Committee of Shandong University. The animals were kept and the experiments were performed in accordance with committee’s criteria for the care and use of laboratory animals. All efforts were made to minimize suffering. Humane endpoints to reduce pain or distress in mice were used via euthanasia. Generally, mice were placed in a chamber and CO2 was administered at a concentration of 60% to 70% over a 5 min exposure time, after which the cervical dislocation method was sometimes used to ensure that effective euthanasia had occurred.
Prediction of epitopes
Potential linear B-cell epitopes for CPC1 were identified following DNASTAR software analysis. Table 1 lists CPC1 T-cell epitopes predicted to bind strongly to MHC class II molecules, based on bioinformatics analyses.
Identification and expression of restructured plasmid
The CPC1 gene was PCR-amplified and inserted into the eukaryotic expression vector pEGFP-C1 to produce a new restructured plasmid, pCPC1. This plasmid was verified by PCR and restriction enzyme analysis. The result of restriction enzyme digestion of pCPC1 was shown in Fig. 2.
HEK 293-T cells were successfully transfected by pCPC1 and the control empty plasmid pEGFP-C1. As shown in Fig. 3, transfected cells emitted green fluorescence when exposed to a blue laser (Fig. 3B, C), while no fluorescence was detected in control cells (Fig. 3A).
Determination of antibody responses in immunized mice
ELISA was used to assess the levels of T. gondii-specific IgG and IgG subclasses in the sera of mice. As shown in Fig. 4, no significant difference in IgG levels was found between the pEGFP-C1 and PBS groups, or between the α-GalCer and PBS groups. However, significantly higher levels of IgG were detected in mice injected with pCPC1 and pCPC1/α-GalCer compared with the control groups (PBS or pEGFP-C1) (P <0.05).
Two weeks after the last immunization, the levels of IgG subclasses (IgG1 and IgG2a) were assessed in all mice to verify whether a Th1 and/or Th2 response was induced. As shown in Fig. 5, a predominance of IgG2a over IgG1 was detected in pCPC1-immunized mice, suggesting a shift toward a Th1 type response. We also observed a significant increase in IgG2a levels in the sera of pCPC1- and pCPC1/α-GalCer-immunized mice (P <0.05). No significant differences in IgG2a levels were found between the PBS and pEGFP-C1 groups or between the PBS and α-GalCer groups (P >0.05).
Mice cytokine production
To determine the cytokine response of mice immunized by the DNA vaccine, culture supernatants of splenocytes were obtained from mice 2 weeks after the final injection and used to detect the production of IFN-γ, IL-2, IL-4, and IL-10. As shown in Table 2, IFN-γ levels in mice immunized with α-GalCer, pCPC1, and pCPC1/α-GalCer were increased about 5-fold, 10-fold, and 15-fold, respectively (P <0.05) compared with PBS-injected groups. Mice immunized with pCPC1/α-GalCer showed the highest IFN-γ levels of all groups (P <0.05). No significant difference in IFN-γ levels was detected between the PBS and pEGFP-C1 groups. Significantly higher levels of IL-2 were detected in mice vaccinated with α-GalCer, pCPC1, or pCPC1/α-GalCer, compared with mice immunized with PBS or an empty plasmid (P <0.05). Mice vaccinated with α-GalCer or pCPC1/α-GalCer had significantly higher levels of IL-4 compared with mice immunized with PBS (P <0.05). However, no significant difference was found between pCPC1 and PBS groups (P >0.05). IL-10 levels did not differ significantly among the 5 experimental and control groups (P >0.05).
Vaccine-induced protection
To assess the level of protection induced by the DNA vaccine, 10 mice per group were challenged intraperitoneally using a lethal dose of T. gondii RH strain (1×104 tachyzoites). Mice were observed daily and the survival days of the challenged mice were recorded. As shown in Fig. 6, mice immunized with pCPC1 or pCPC1/α-GalCer had significantly longer survival times than control mice injected with PBS or pEG-FP-C1 (P <0.05). pCPC1/α-GalCer-immunized mice exhibited the longest survival time of all groups (P <0.05). Although mice of the α-GalCer group showed longer survival days compared with the PBS group, this difference was not significant (P >0.05).
Bioinformatics is an interdisciplinary field that has been widely used to predict the structure and function of protein antigenic epitopes [22,23]. Previous studies showed that specific epitopes of proteins induced the immune response and determined the antigen specificity [24]. Epitope prediction plays an important role in T. gondii vaccine research [25,26]. CPC1 was reported to be important for T. gondii tachyzoite growth and differentiation. In order to predict whether TgCPC1 is suitable for vaccine, software and online services were used to predict B cell and T cell epitopes of CPC1. We used DNAStar software to yield several potential CPC1 B-cell epitopes, while potential T-cell epitopes were predicted using the online service IEDB. As shown in Table 1, a lower value of IC50 suggested a higher affinity and an improved T cell epitope. Our data analysis indicated that TgCPC1 could be regarded as a potential antigen and may serve as a vaccine against T. gondii.
In this study, CPC1 gene was obtained and inserted into a eukaryotic expression plasmid pEGFP-C1 following the prediction of bioinformatics. The green fluorescence was observed in recombinant plasmid transfected cells suggested that the eukaryotic expression plasmid was constructed successfully.
Previous studies have shown that cellular immunity mediated by T cells including CD4+ and CD8+ T lymphocytes plays a crucial role in resisting T. gondii infection [27,28]. According to the cytokines produced post-stimulation, CD4+ T lymphocytes include 2 subtypes, Thl and Th2 cells; the former secrete IL-2 and IFN-γ, while the latter secrete IL-4, IL-5, IL-6, and IL-10 [29]. IFN-γ plays a dominant role in controlling both tachyzoites in the acute phase of infection and bradyzoites during the chronic phase. Humoral immunity of the host is also important in resisting T. gondii infection, with specific IgG antibodies known to prevent T. gondii adhesion to host cells [30,31].
A good immunization protocol was previously shown to aim for a Th1-type response rather than a Th2-type response [32,33]. Characteristic of this response was the large number of cytokines and high level of IgG antibodies, which are necessary for protection against T. gondii [34,35]. IL-4 and IL-10 cytokines were also found to limit the Th1-type immune response and to restrain IFN-γ production [36,37]. In the present study, we induced a significant increase of IL-2 and especially IFN-γ through stimulation with the DNA vaccine pEG-FP-CPC1. Additionally, T. gondii-specific IgG and IgG2a antibody levels were notably higher than in control groups. However, IgG1, IL-4, and IL-10 levels were similar between control and pCPC1 groups, indicating that pCPC1 mainly caused a specific Th1-type immune response. Therefore, pCPC1 is a good potential vaccine candidate against toxoplasmosis. The immunized BALB/c mice were challenged using T. gondii tachyzoites to evaluate the protective efficacy of the DNA vaccine. The findings indicated that the mice of pCPC1 group had significantly prolonged survival times compared with negative controls.
Single DNA vaccines often cannot provide sufficient protection against T. gondii infection [38,39], so adjuvants may be needed to intensify the immune responses produced by the vaccines [12]. In the current study, we used the natural killer T cell ligand α-GalCer to enhance the immune action of pCPC1. Stimulation of natural killer T cells by α-GalCer was previously shown to cause the production of IL-2, IL-4, and IFN-γ, and the activation of NK, CD4(+), and CD8(+) T cells [16,40,41]. In line with this, we detected higher levels of IFN-γ, IL-2, and IL-4 in mice vaccinated with α-GalCer compared with control mice. Moreover, the highest levels of IFN-γ and IL-2 were detected and the longest survival time was recorded in mice vaccinated with pCPC1/α-GalCer among all groups. These results suggest that the adjuvant α-GalCer enhances the efficacy of the DNA vaccine pCPC1 associating with immune responses against T. gondii.
In conclusion, the DNA vaccine CPC1 elicited marked immune responses against T. gondii, which were enhanced by the adjuvant α-GalCer. This indicates that the vaccine CPC1 with combined adjuvant could be a new candidate for further vaccine development against toxoplasmosis.

CONFLICT OF INTEREST

The authors declare that they have no competing interests.

This work was supported in part by grants from the National Natural Science Foundation of China (grant nos. 81071373 and 81271857), the State Key Laboratory of Veterinary Etiological Biology (grant no. SKLVEB2011KFKT005) and the Shandong Provincial Natural Science Foundation (grant no. ZR2016HM74).
Fig. 1
Immunization schedules of BALB/c mice. All mice of 5 groups were intramuscularly injected 3 times at 2 weeks interval. α-GalCer (2 μg) was diluted with 100 μl PBS.
kjp-55-5-505f1.gif
Fig. 2
Identification of pCPC1 with restriction enzyme digestion. Lane Marker, DNA marker; lane 1, pCPC1 digested with Sac I/Kpn I.
kjp-55-5-505f2.gif
Fig. 3
The detection of the fusion protein in transfected HEK 293-T cells. (A) Cells transfected by control blank were detected under blue light. (B) Cells transfected by pEGFP-C1 were detected under blue light. (C) Cells transfected by pCPC1 were detected under blue light.
kjp-55-5-505f3.gif
Fig. 4
Detection of specific IgG antibodies in sera of vaccinated mice by ELISA. Sera was collected prior to each immunization and 2 weeks after the final injection. All samples were performed 3 times. The results are mean of 15 mice per group and expressed as the mean of the optical density of 490±SD. *P<0.05, as compared with PBS and pEGFP-C1.
kjp-55-5-505f4.gif
Fig. 5
Detection of IgG1 and IgG2a levels in sera of immunized mice by ELISA. Sera were collected at 2 weeks after the final injection and detected by ELISA. All samples were performed 3 times. The results are mean of 15 mice per group and expressed as the mean of the optical density of 490±SD. *P <0.05, as compared with PBS and pEGFP-C1.
kjp-55-5-505f5.gif
Fig. 6
Survival curves of injected BALB/c mice after T. gondii challenge infections. Ten mice per group were challenged with 1×104 tachyzoites of virulent T. gondii RH strain 2 weeks after the final immunization. Survival time was monitored daily for 18 days after challenge. *P<0.05, as compared with PBS or pEGFP-C1; **P<0.05, as compared with pCPC1.
kjp-55-5-505f6.gif
Table 1
IC50 values for CPC1 peptide binding to MHC class II molecules obtained using the immune epitope databasea
Table 1
MHC II alleleb Start-stopc Percentile rankd
HLA-DRB1*01:01 17–31 1.36
441–455 2.73

H2-IAb 416–430 1.26
213–227 1.54

H2-IAd 7–21 0.13
719–733 0.29

H2-IEd 668–682 13.79
208–222 20.31

aThe immune epitope database (http://tools.immuneepitope.org/mhcii). The prediction was run 3 times.

bHLA-DRB1*01:01 allele is a human MHC class II molecule. H2-IAb, H2-IAd and H2-IEd alleles are mouse MHC class II molecules.

cWe chose 15 amino acids for analysis each time.

dLow percentile means high level binding; high percentile means low level binding.

Table 2
The level of cytokines produced by splenocytesa from immunized mice
Table 2
Group Production of cytokineb (pg/ml)
IFN-γ IL-2 IL-4 IL-10
PBS 51.6±7.4 32.7±5.3 33.5±5.4 38.7±6.6
pEGFP-C1 55.4±7.8 29.9±5.1 39.0±7.2 40.0±5.3
α-GalCer 311.3±35.9c 134.7±16.0c 95.4±13.6c 43.1±6.2
pCPC1 586.3±54.1c,d 234.6±30.8c,d 36.2±6.1d 42.3±8.5
pCPC1/α-GalCer 831.7±70.2c,d,e 377.9±35.7c,d,e 104.3±11.8c,e 45.5±7.2

Results are presented as mean±SD.

aSplenocytes from 5 mice per group 2 weeks after the final immunization.

bValues for IFN-γ are for 96 hr. Values for IL-2 and IL-4 are for 24 hr. Values for IL-10 are for 72 hr. All samples were performed 3 times.

cP<0.05, as compared with PBS and pEGFP-C1.

dP<0.05, as compared with α-GalCer.

eP<0.05, as compared with pCPC1.

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DNA Vaccines Encoding Toxoplasma gondii Cathepsin C 1 Induce Protection against Toxoplasmosis in Mice
Korean J Parasitol. 2017;55(5):505-512.   Published online October 31, 2017
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DNA Vaccines Encoding Toxoplasma gondii Cathepsin C 1 Induce Protection against Toxoplasmosis in Mice
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Fig. 1 Immunization schedules of BALB/c mice. All mice of 5 groups were intramuscularly injected 3 times at 2 weeks interval. α-GalCer (2 μg) was diluted with 100 μl PBS.
Fig. 2 Identification of pCPC1 with restriction enzyme digestion. Lane Marker, DNA marker; lane 1, pCPC1 digested with Sac I/Kpn I.
Fig. 3 The detection of the fusion protein in transfected HEK 293-T cells. (A) Cells transfected by control blank were detected under blue light. (B) Cells transfected by pEGFP-C1 were detected under blue light. (C) Cells transfected by pCPC1 were detected under blue light.
Fig. 4 Detection of specific IgG antibodies in sera of vaccinated mice by ELISA. Sera was collected prior to each immunization and 2 weeks after the final injection. All samples were performed 3 times. The results are mean of 15 mice per group and expressed as the mean of the optical density of 490±SD. *P<0.05, as compared with PBS and pEGFP-C1.
Fig. 5 Detection of IgG1 and IgG2a levels in sera of immunized mice by ELISA. Sera were collected at 2 weeks after the final injection and detected by ELISA. All samples were performed 3 times. The results are mean of 15 mice per group and expressed as the mean of the optical density of 490±SD. *P <0.05, as compared with PBS and pEGFP-C1.
Fig. 6 Survival curves of injected BALB/c mice after T. gondii challenge infections. Ten mice per group were challenged with 1×104 tachyzoites of virulent T. gondii RH strain 2 weeks after the final immunization. Survival time was monitored daily for 18 days after challenge. *P<0.05, as compared with PBS or pEGFP-C1; **P<0.05, as compared with pCPC1.
DNA Vaccines Encoding Toxoplasma gondii Cathepsin C 1 Induce Protection against Toxoplasmosis in Mice

IC50 values for CPC1 peptide binding to MHC class II molecules obtained using the immune epitope databasea

MHC II alleleb Start-stopc Percentile rankd
HLA-DRB1*01:01 17–31 1.36
441–455 2.73

H2-IAb 416–430 1.26
213–227 1.54

H2-IAd 7–21 0.13
719–733 0.29

H2-IEd 668–682 13.79
208–222 20.31

aThe immune epitope database (http://tools.immuneepitope.org/mhcii). The prediction was run 3 times.

bHLA-DRB1*01:01 allele is a human MHC class II molecule. H2-IAb, H2-IAd and H2-IEd alleles are mouse MHC class II molecules.

cWe chose 15 amino acids for analysis each time.

dLow percentile means high level binding; high percentile means low level binding.

The level of cytokines produced by splenocytesa from immunized mice

Group Production of cytokineb (pg/ml)
IFN-γ IL-2 IL-4 IL-10
PBS 51.6±7.4 32.7±5.3 33.5±5.4 38.7±6.6
pEGFP-C1 55.4±7.8 29.9±5.1 39.0±7.2 40.0±5.3
α-GalCer 311.3±35.9c 134.7±16.0c 95.4±13.6c 43.1±6.2
pCPC1 586.3±54.1c,d 234.6±30.8c,d 36.2±6.1d 42.3±8.5
pCPC1/α-GalCer 831.7±70.2c,d,e 377.9±35.7c,d,e 104.3±11.8c,e 45.5±7.2

Results are presented as mean±SD.

aSplenocytes from 5 mice per group 2 weeks after the final immunization.

bValues for IFN-γ are for 96 hr. Values for IL-2 and IL-4 are for 24 hr. Values for IL-10 are for 72 hr. All samples were performed 3 times.

cP<0.05, as compared with PBS and pEGFP-C1.

dP<0.05, as compared with α-GalCer.

eP<0.05, as compared with pCPC1.

Table 1 IC50 values for CPC1 peptide binding to MHC class II molecules obtained using the immune epitope databasea

The immune epitope database (http://tools.immuneepitope.org/mhcii). The prediction was run 3 times.

HLA-DRB1*01:01 allele is a human MHC class II molecule. H2-IAb, H2-IAd and H2-IEd alleles are mouse MHC class II molecules.

We chose 15 amino acids for analysis each time.

Low percentile means high level binding; high percentile means low level binding.

Table 2 The level of cytokines produced by splenocytesa from immunized mice

Results are presented as mean±SD.

Splenocytes from 5 mice per group 2 weeks after the final immunization.

Values for IFN-γ are for 96 hr. Values for IL-2 and IL-4 are for 24 hr. Values for IL-10 are for 72 hr. All samples were performed 3 times.

P<0.05, as compared with PBS and pEGFP-C1.

P<0.05, as compared with α-GalCer.

P<0.05, as compared with pCPC1.