Cross-protective effect of a combined L5 plus L3 Leishmania major ribosomal protein based vaccine combined with a Th1 adjuvant in murine cutaneous and visceral leishmaniasis
- Laura Ramirez1,
- Laura Corvo1,
- Mariana C Duarte2,
- Miguel A Chávez-Fumagalli2,
- Diogo G Valadares3,
- Diego M Santos4,
- Camila I de Oliveira4,
- Marta R Escutia5,
- Carlos Alonso1,
- Pedro Bonay1,
- Carlos AP Tavares3,
- Eduardo AF Coelho†2, 6 and
- Manuel Soto†1Email author
© Ramirez et al.; licensee BioMed Central Ltd. 2014
Received: 24 September 2013
Accepted: 28 December 2013
Published: 2 January 2014
Two Leishmania major ribosomal proteins L3 (LmL3) and L5 (LmL5) have been described as protective molecules against cutaneous leishmaniasis due to infection with L. major and Leishmania braziliensis in BALB/c mice when immunized with a Th1 adjuvant (non-methylated CpG-oligodeoxynucleotides; CpG-ODN). In the present study we analyzed the cross-protective efficacy of an LmL3-LmL5-CpG ODN combined vaccine against infection with Leishmania amazonensis and Leishmania chagasi (syn. Leishmania infantum) the etiologic agents of different clinical forms of human leishmaniasis in South America.
The combined vaccine was administered subcutaneously to BALB/c mice. After immunization the cellular and humoral responses elicited were analyzed. Mice were independently challenged with L. amazonensis and L. chagasi. The size of the cutaneous lesions caused by the infection with the first species, the parasite loads and the immune response in both infection models were analyzed nine weeks after challenge.
Mice vaccinated with the combined vaccine showed a Th1-like response against LmL3 and LmL5. Vaccinated mice were able to delay lesion development due to L. amazonensis infection and to control parasite loads in the site of infection. A reduction of the parasite burden in the lymph nodes draining the site of infection and in the liver and spleen was observed in the vaccinated mice after a subcutaneous infection with L. chagasi. In both models of infection, protection was correlated to parasite antigen-specific production of IFN-γ and down-regulation of parasite-mediated IL-4 and IL-10 responses.
The data presented here demonstrate the potential use of L. major L3 and L5 recombinant ribosomal proteins for the development of vaccines against various Leishmania species.
KeywordsLeishmania parasites L3 and L5 ribosomal proteins BALB/c mice Experimental infection Vaccines Visceral leishmaniasis Cutaneous leishmaniasis
Infection with different species from the genus Leishmania can cause a variety of clinical symptoms known globally as leishmaniasis. Although some veterinary vaccines against leishmaniasis are now available[2–4] no vaccine has been developed for humans. During the last few years some advances in the development of vaccines against leishmaniasis have been carried out. Given that first generation vaccines using crude parasite antigens were unable to induce protection two main strategies have been explored for the development of anti-Leishmania vaccines. The first one employ live vaccines composed of molecularly modified attenuated parasites (leishmanization) to induce protective anti-Leishmania immune responses[7, 8]. Alternatively, second generation vaccines are based on the use of parasite protein fractions[9, 10] or individual parasite antigens. Although some of these second generation vaccines are currently used in human clinical trials the screening of new candidates will help to further increase the prophylactic efficacy of a Leishmania vaccine. It has been proposed that combination of different parasite antigens may help to attain a vaccine containing the most appropriate protective characteristics. In addition, since multiple Leishmania species are distributed in the same or adjacent geographical regions it would be desirable to develop vaccines containing candidates capable of inducing protection against the infection caused by various Leishmania species. One example of this situation is South America where the leishmaniasis disease ranges from visceral forms (VL) caused by Leishmania chagasi (syn. Leishmania infantum) infection, to cutaneous forms (CL) caused by infection with different parasite species such as Leishmania braziliensis, Leishmania. pifanoi and Leishmania amazonensis. All these species can coexist in different geographical regions. Thus, to be effective as a human vaccine against leishmaniasis its components should be shared by different parasite species and, prior to its use in humans, the protective efficacy of these candidates should be analyzed in different models of experimental leishmaniasis.
Examples of such vaccine preparations are those based on parasite ribosomal proteins. It has been demonstrated that a preparation of biochemically purified Leishmania ribosomal proteins (LRP) administered in combination with Th1 inducing adjuvants conferred protection against the challenge with different parasite species: L. amazonensis and L. chagasi or L. major promastigotes. Also, vaccinated and protected BALB/c mice were able to control the disease due to a secondary parasite challenge. It was recently reported that two of the large subunit constituents of L. major ribosomes L3 or L5, expressed as recombinant proteins (LmL3 and LmL5) and administered independently or in combination (always in the presence of a Th1 adjuvant such as non-methylated CpG-oligodeoxynucleotides; CpG-ODN) were able to control the outcome of infection in an experimental model of American CL, namely BALB/c mice infected with L. braziliensis. Globally, it was found that protection was associated with both, the induction of LRP-, LmL3- or LmL5-specific IFN-γ mediated responses and the control of the antigen dependent production of the susceptibility associated cytokines IL-10 and IL-4.
The first objective of the study was to analyze the immunogenic properties of a vaccine combining the LmL3 and LmL5 recombinant proteins and CpG-ODN as adjuvant in BALB/c mice. The second objective was to study the combined vaccine prophylactic properties, challenging immunized mice with two different Leishmania species: L. amazonensis and L. chagasi. The potential mechanism of the combined vaccine-induced observed protection was also investigated and is consistent with the maintenance of the Th1-like response against the LmL3 and LmL5 antigens induced by vaccination after infection.
Antigens and adjuvant
Soluble Leishmania antigenic (SLA) extract was prepared from stationary-phase promastigotes of L. major, L. chagasi and L. amazonensis as previously described. L. major ribosomal proteins (LRP) or mouse ribosomal proteins (MRP) were prepared from logarithmic-phase promastigotes of L. major and RAW 264.7 murine macrophage cells, respectively, as previously described in.
LmL3 and LmL5 recombinant proteins were over-expressed in Escherichia coli (M15 strain), purified under denaturing conditions onto Ni-nitrilotriacetic-acid-agarose columns (Qiagen, Hilden, Germany) and refolded on the affinity column, as described in. Polymyxin-agarose columns (Sigma, St. Louis. MO, USA) were employed to remove residual endotoxin content (<10 ng of LPS per 1 mg of recombinant protein, measured by the Quantitative Chromogenic Limulus Amebocyte Assay QCL-1000 (BioWhittaker, MD, USA)).
Phosphorothioate-modified CpG-ODN (5′-TCAACGTTGA-3′ and 5′- GCTAGACGTTAGCGT-3′) were synthesized by Isogen Life Science B.V. (De Meern, The Netherlands) and employed for their capacity to induce Th1 responses in mice when immunized with different leishmanial antigenic preparations[16, 22].
Immunization, challenge infection, cutaneous lesion development and parasite quantitation
The Bioethical Committee of the Consejo Superior de Investigaciones Científicas (CEEA-11/046) and the Universidad Autónoma de Madrid (CEI 21–443) in Spain and the Animal Use Committee of the Federal University of Minas Gerais (CEUA; 047/2009) in Brazil approved the experimental. Mice (n = 4 or 5) were subcutaneously (s.c.) immunized in their left hind footpads with a mixture of the LmL3 and LmL5 recombinant proteins (6 μg each) plus 25 μg of each CpG-ODN (combined vaccine). As control groups, mice (n = 4 or 5) were inoculated with 25 μg of each CpG-ODN or with saline (PBS; vaccine diluent). Each group was boosted two and four weeks later with the same dose. For challenge, immunized mice were s.c. infected, into the right hind footpad, with 1 × 107 stationary-phase promastigotes of L. chagasi (n = 4, per group) or with 1 × 106 stationary-phase promastigotes of L. amazonensis (n = 4 per group). In mice infected with L. amazonensis, footpad swelling was measured with a metric caliper (the thickness of the left footpad minus thickness of the right footpad is shown). At week nine post-challenge all animals were sacrificed. For parasite load determination, the footpads of mice infected with L. amazonensis were taken and weighed before their individual processing. In addition the whole spleen, liver and the single popliteal lymph node draining the site of infection (DLN, right leg) of mice s.c. infected with L. chagasi were collected and independently processed as follows. Samples were mechanically homogenized in complete Schneider’s medium (Schneider’s medium (Sigma) supplemented with 20% heat-inactivated fetal bovine serum (FBS, Sigma), 20 mM L-glutamine, 200 U/ml penicillin, 100 μg/ml streptomycin and 50 μg/ml gentamicin) and filtered using a cell strainer (70-μm pore size). Each homogenized sample tissue was serially diluted in a 96-well flat-bottomed microtiter plate containing the same medium (in triplicates). The number of viable parasites (by mg of tissue for the footpads and by organ in the spleen, liver and DLN) was determined from the highest dilution at which promastigotes could be grown with up to 10 days of incubation at 25°C as previously described.
Mice and parasites
Female BALB/c mice (6–8 weeks old) were purchased from Harlan (BCN, Spain) or from the Institute of Biological Sciences, ICB, Federal University of Minas Gerais (Belo Horizonte, Brazil). First, the immunization procedure was carried out using a total number of 15 mice (5 mice immunized with saline, 5 mice immunized with the adjuvant and 5 mice immunized with the combined vaccine). Mice were euthanized one month after the last immunization for the analysis of the immune response elicited by vaccination. Next, mice were immunized subcutaneously with the combined vaccine (n = 12), with the vaccine diluent (n = 12) or with the vaccine adjuvant (n = 12). One month after vaccination, 4 mice per group were euthanized to test the reproducibility of the vaccine induced response. The remaining animals were infected s.c. with L. amazonensis (n = 4 mice per group) or L. chagasi (n = 4 per group) to analyze the effect of vaccination in leishmaniasis progression. This last assay was reproduced using the same number of mice.
Regarding parasites, L. major clone V1 (MHOM/IL/80/Friedlin), L. chagasi (MOM/BR/1970/BH46) and L. amazonensis (IFLA/BR/1967/PH-8) parasites were grown at 25°C in complete Schneider’s medium.
Spleen cells obtained from each mouse were seeded and independently cultured in RPMI complete medium at 5 × 106 cells per ml (RPMI medium (Sigma) supplemented with 10% heat-inactivated FBS, 20 mM L-glutamine, 200 U/ml penicillin, 100 μg/ml streptomycin and 50 μg/ml gentamicin) during 48 h at 37°C in 5% CO2 alone or with some of the next stimuli: recombinant LmL3 (12 μg/ml), recombinant LmL5 (12 μg/ml), SLA (from the indicated species, 12 μg/ml), LmLRP (12 μg/ml) and MRP (12 μg/ml). The release of IFN-γ, IL-10 and IL-4 was measured in culture supernatants by sandwich ELISA using monoclonal antibodies specific for mouse cytokines (capture and detection) provided in commercial kits (Pharmingen, San Diego, CA, USA), following the manufacturer’s instructions.
Analysis of the humoral responses
Animals (n = 4 per group) were bled four weeks after the last immunization and nine weeks after challenge and the anti-LmL3-, anti-LmL5- or anti-SLA specific IgG1 and IgG2a antibodies present in the sera were measured by ELISA, as described elsewhere. Briefly, 96-well plates (Becton Dickinson, Franklin Lakes, NJ, USA) were sensitized with the recombinant proteins or SLA (from the indicated species) at 10 μg/ml (each one) in PBS (100 μl/well) for 16 h at 4°C. Plates were blocked with PBS-10% bovine serum albumin at 37°C for 1 h and treated with 1/200 dilutions of mouse serum samples for 2 h at 37°C. Peroxidase-conjugated anti-mouse IgG1 or IgG2a isotype (Sigma) was diluted at 1:5,000 (for recombinant proteins) or 1:10,000 (for SLA) and added for 1 h at 37°C. Reactions were developed by incubation with H2O2 and O-phenylenediamine. Optical densities were read at 492 nanometers in a spectrophotometer (Molecular Devices, Spectra Max Plus, Concord, Canada).
Statistical analysis with the vaccinated and infected mice was performed by a two-tailed Student’s t-test. Differences were considered significant when P < 0.05.
Results and discussion
Immunogenicity of the LmL3 + LmL5 + CpG-ODN combined vaccine in BALB/c mice
Since combination of different parasite protective antigens have been defined as an adequate strategy for Leishmania vaccine development[24, 25] we decided to test a LmL3 + LmL5 + CpG-ODN combined vaccine based on the observation that both proteins were able to induce protection against murine CL due to L. major infection. Moreover, administration of the CpG-ODN adjuvant combined with these antigens as single or combined vaccines induced a robust protection in mice against infection with a mixture of L. braziliensis stationary-phase promastigotes and insect vector saliva, while no protection was observed when animals were only treated with CpG-ODN. However, the immune response elicited against the antigens by their co-administration was not analyzed in that work.
Leishmania LmL3 and LmL5 proteins were selected for a cross-protection analysis due to their high degree of conservation among different Leishmania species. On the other hand, and regarding host counterparts, L. major LmL3 and LmL5 showed lower identity and similarity scores with respect to their mouse homologs: Mus musculus L3 (NCBI: NP_038790.2), identity: 59.4%, similarity: 74.0%; Mus musculus L5 (NCBI: NP_000960.2), identity: 53.4%, similarity: 68.5%. Remarkably, no humoral or cellular responses against host ribosomal proteins were observed in vaccinated mice (Figure 1A-D; MRP). This lack of immune cross-reactivity between parasite and host intracellular proteins belonging to conserved families was also observed for other intracellular antigens, such as histones and heat shock proteins in infected individuals. This observation has been related to the location of B and T cell epitopes in the most divergent regions of these parasite proteins[28–30].
Effects of vaccination in the development of CL due to L. amazonensis and VL due to L. chagasi in BALB/c mice
The decrease in parasite loads in the infected footpads was statistically significant when compared with both groups (P = 1.6 × 10-5 and P = 4.5 × 10-5 for saline and CpG-ODN groups, respectively). It was concluded that although the administration of the adjuvant alone could have a slight influence on the outcome of infection, the administration of the combined vaccine induced a delay of the progressive disease due to the L. amazonensis challenge. The BALB/c-L. amazonensis model of infection has been employed for a limited number of antigenic preparations including some antigens described as protective in other forms of the disease like the LACK protein or the amastigote A2 antigen (reviewed in) and the Leishmania P4 nuclease, a protein immunogenic in humans infected with L. major and related to protection against experimental murine L. pifanoi infection. Among them, the most protective formulation was based on defined antigens administered in combination with IL-12: P4 nuclease or the A2 protein, since no footpad swelling was observed after L. amazonensis challenge. Although it is difficult to establish a direct comparison between different vaccine candidates (due to the use of different parasite strains, number of parasite in the inoculum, adjuvants employed, etc.), the combined vaccine assayed here seems to be inducing weaker protection than vaccines that employ IL-12 as adjuvant, a cytokine that plays a central role in promoting Th1 responses and cell-mediated immunity. The effects of the combined vaccine are more comparable with other vaccines based on parasite total proteins[37–39], antigenic extracts[38–40] including LRP + saponin and some DNA vaccines based on the A2 or LACK proteins, that induced a delay in the footpad swelling. Of interest, the 4.5-log reduction observed in the footpad parasite loads of mice vaccinated with the LmL3 + LmL5 + CpG-ODN preparation with respect to both control groups (Figure 2B) was comparable in magnitude with parasite burden differences observed in mice vaccinated with the most protective formulations and their controls[20, 35, 41]. Moreover, it should be taken into account that some antigen-based vaccines, such as LACK combined with IL-12 or a DNA vaccine based on a Nucleoside Hidrolase an antigen that induces partial protection against other Leishmania species, were unable to control murine CL due to L. amazonensis infection. In addition, some parasite serine-proteases were able to exacerbate the L. amazonensis related disease when immunized as a prophylactic preparation alone or combined with saponin.
A great number of different molecules have been tested as second generation vaccines in murine models of VL infection. Most of the tested antigens were studied using the intravenous route of infection that guarantee the induction of VL but could undervalue the potential efficacy of some vaccines. We decided to subcutaneously challenge L. chagasi in the footpad of BALB/c mice because this model has been accepted as an optimal screening tool to analyze protective antigens and has been previously employed to test the immunoprophylactic properties of different parasite components[46, 47], including the combination of LRP and saponin. As it is shown in Figure 2C the L. chagasi challenge resulted in parasite active infection with the presence of parasites in the DLN (in the absence of footpad swelling) but also in the spleen and in the liver, internal organs involved in parasite replication in murine VL. Nine weeks after infection, mice immunized with LmL3 + LmL5 + CpG-ODN showed significantly lower parasite burdens than both control groups in the three analyzed organ locations (Figure 2C). The decrease of parasite loads in the vaccinated mice was more evident in the internal organs (2.5-log reduction in the liver and in the spleen when compared with saline group and 2-log reduction in the liver and in the spleen when compared with the CpG-ODN group). A significant decrease in the parasite burdens of the lymph node draining the infected footpad (2-log and 1.5-log reduction when compared with saline and CpG-ODN groups, respectively) was also observed. As it also occurred after L. amazonensis challenge (the present study) and other cutaneous species (L. major and L. braziliensis) vaccinated mice were able to control the replication of different Leishmania species, allowing the conclusion that LmL3 and LmL5 based vaccines will fit the requirements to a pan-Leishmania vaccine.
Immunological parameters associated with protection
To determine the immunological parameters of protection, the production of different cytokines in the supernatants of spleen cell cultures, established from the different groups of mice and stimulated with different antigenic preparations was analyzed.
Similarly, when the cellular responses elicited in BALB/c mice infected with L. chagasi against the LcSLA (using extracts prepared from this parasite specie) were analyzed, a LcSLA-specific production of IFN-γ was detected in the vaccinated mice that was absent in saline (P = 5 × 10-9) or CpG-ODN (P = 4 × 10-7) groups (Figure 3B). This response was correlated to the predominant presence of anti-LcSLA IgG2a antibodies in the sera from vaccinated and infected mice (Figure 5). Since IFN-γ dependent activation of infected macrophages for production of nitric oxide is necessary for Leishmania intracellular killing this cytokine has been considered one of the main factors implicated in the acquired immunity against infection with viscerotropic Leishmania species[15, 41, 52, 53]. IL-10 parasite mediated responses are critical for VL progression, since BALB/c mice lacking the gene for IL-10 or BALB/c mice treated with an anti-IL-10 receptor antibody are resistant to infection. In accordance, mice vaccinated with the LmL3 + LmL5 + CpG-ODN combined vaccines showed a specific decrease in the LcSLA-mediated IL-10 (P = 0.0004 for saline and P = 8 × 10-7 for CpG-ODN) (Figure 3B) and also a controlled production of IL-4 specific for the parasite antigens (P = 7 × 10-5 for saline and P = 2 × 10-5 for CpG-ODN) (Figure 3B) correlated to the presence of low levels of anti-LcSLA IgG1 reacting antibodies (Figure 5). Although the implication of IL-4 mediated responses in murine VL progression has not been clearly demonstrated, various reports have correlated the induction of protection against a subcutaneous challenge with L. chagasi to the control of Leishmania-specific IL-4 mediated responses[15, 41, 46, 47].
The present study indicated that the administration of a vaccine based on the combination of the recombinant versions of the L. major ribosomal proteins L3 and L5 in the presence of a Th1 adjuvant (CpG-ODN) conferred cross-protection in BALB/c mice against subcutaneous infection with two different Leishmania species: L. amazonensis and L. chagasi. After vaccination, mice showed an LmL3, LmL5 and LRP (Leishmania ribosomal proteins) Th1-like response as shown by the production of IFN-γ specific for these antigens, in the absence of IL-10 or IL-4-specific responses. In spite of the conserved nature of the ribosomal proteins, vaccinated mice did not show cellular and humoral responses against the ribosomal protein of the vertebrate host (MRP extract). The immune response against LmL3 and LmL5 elicited by the combined vaccine was maintained after infection in the vaccinated and protected mice. Protection was also correlated with the induction of parasite dependent IFN-γ responses and with the down-regulation of parasite dependent IL-4 and IL-10 responses. Since LmL3 and LmL5 based vaccines were able to induce protection against different Leishmania species in BALB/c mice (L. amazonensis and L. chagasi; this work) and other cutaneous species such as L. major and L. braziliensis we may conclude that these antigens could play a relevant role as components of a pan-Leishmania vaccine.
The study was supported in Spain by grants from Laboratorios LETI S.L.u-Fundación Severo Ochoa, from Ministerio de Ciencia e Innovación FIS/PI080101 and FIS PI11/00095 and from the Instituto de Salud Carlos III within the Network of Tropical Diseases Research (VI P I + D + I 2008–2011, ISCIII -Subdirección General de Redes y Centros de Investigación Cooperativa (RD12/0018/0009)). This work was also, in part, supported by grants from Instituto Nacional de Ciência e Tecnologia em Nano-Bbiofarmacêutica, FAPEMIG (CBB-APQ-00496-11 and CBB-APQ-00819-12), and CNPq (APQ-472090/2011-9 and APQ-482976/2012-8). EAFC is a grant recipient of CNPq. MACF is a grant recipient of CAPES/FAPEMIG. A CBMSO institutional grant from Fundación Ramón Areces is also acknowledged.
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