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Minireview

Not All Antigens Are Created Equally: Progress, Challenges, and Lessons Associated with Developing a Vaccine for Leishmaniasis

Malcolm S. Duthie, Steven G. Reed
Christopher J. Papasian, Editor
Malcolm S. Duthie
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Steven G. Reed
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Christopher J. Papasian
UMKC School of Medicine
Roles: Editor
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DOI: 10.1128/CVI.00108-17
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ABSTRACT

From experimental models and the analyses of patients, it is well documented that antigen-specific T cells are critical for protection against Leishmania infection. Effective vaccines require both targeting to the pathogen and an immune stimulant to induce maturation of appropriate immune responses. While a great number of antigens have been examined as vaccine candidates against various Leishmania species, few have advanced to human or canine clinical trials. With emphasis on antigen expression, in this minireview we discuss some of the vaccine platforms that are currently being explored for the development of Leishmania vaccines. It is clear that the vaccine platform of choice can have a significant impact upon the level of protection induced by particular antigens, and we provide and highlight some examples for which the vaccine system used has impacted the protective efficacy imparted.

INTRODUCTION

Hemoflagellate protozoa of the genus Leishmania constitute more than 20 species and subspecies of parasites that infect an estimated 12 million people from among a pool of more than 350 million people considered at risk of infection (1, 2, 3). The required interaction with infected sand flies to permit transmission renders leishmaniasis predominantly a disease of the poor, occurring mostly in remote rural villages with poor housing and little or no access to modern health care facilities. Any form of leishmaniasis therefore puts stress on the already limited financial resources of both the affected individual and the community at large (1). Vector-control programs are, however, having an impact, and on the Indian subcontinent a visceral leishmaniasis (VL) elimination target is being met in most areas of endemicity (2). With disruption in control efforts allowing new epidemics in areas of endemicity and the spread of the disease to previously free areas because of migration, tourism, and military activities, however, an effective vaccine remains highly desirable in order to retain/sustain the success of recent efforts (3).

POTENTIAL FOR VACCINES

The quality of the immune response is critical in determining if Leishmania infection manifests disease. The clinical symptoms are also dependent upon the particular Leishmania species, which vary in their geographic distributions. Manifestations range from localized, disseminated, diffuse, or recidivate cutaneous leishmaniasis (CL) or mucosal leishmaniasis (ML) to involvement of organs such as liver and spleen in cases of VL (3). CL can arise from infection with any of several Leishmania species (i.e., L. major or L. tropica) and can progress to the gross mucosal tissue destruction observed in ML patients. VL is the most severe form and in South Asia and Africa is caused by infection with L. donovani, while in the Mediterranean, the Middle East, Latin America, and other parts of Asia, it results from infection with L. infantum.

Protection from, and clearance of, Leishmania infection is strongly associated with the generation of antigen-specific Th1 responses, knowledge that provides a clear goal for immunization. To target and appropriately skew the anti-Leishmania response, vaccines require both pathogen-specific antigens and immune-stimulating molecules to be rendered effective. Whole and genetically attenuated parasites, such as L. donovani centrin-deleted parasites (LdCen1−/−), have undergone trials in both dogs and humans (4–8). Dendritic cell (DC)-based vaccines represent a more refined strategy and have been used in preclinical models. Although financial constraints and the likely difficulties in delivering such vaccines in regions of Leishmania endemicity seem to preclude their use in all but a very limited subset of individuals, DC-based vaccines provide further proof of concept supporting the use of more defined vaccines (9).

Our understanding of pattern recognition receptors and adjuvants that can be used in conjunction with recombinant proteins within defined subunit vaccines continues to expand (10–12). A wide variety of adjuvants have been used in Leishmania research programs, and the importance of adjuvants within vaccines has been the subject of numerous review articles (13–16). Simultaneous with the progress in adjuvant technologies, advances in bioinformatics and molecular techniques have expanded the number of potential Leishmania-specific targets for use within a vaccine (17–19). A considerable number of Leishmania antigens have been tested as subunit protein or DNA vaccine candidates against various Leishmania species, but variable results have meant that very few antigens have advanced to human or canine clinical trials (20). Factors such as the Leishmania source of the target gene, the Leishmania species involved in the challenge, the quantity of antigen/vector used, and the frequency and numbers of immunizations all impact our ability to interpret the data beyond their immediate application. In addition, once targets are selected, there are also now a plethora of strategies available with which to ready them for use within a vaccine (21). In this minireview, we discuss the current status of vaccine development for leishmaniasis with emphasis on the impact of the expression/vaccine platforms.

PURIFIED RECOMBINANT PROTEINS

Native Leishmania proteins have been used in either a crude or a purified manner to elicit protective immune responses. Escherichia coli and yeast are among the most widely used systems for the production of recombinant proteins (22–24), and bioinformatics has facilitated the production of a variety of recombinant proteins that have been investigated as Leishmania vaccine antigen candidates in animal models (15, 20). Key to the use of recombinant proteins is the cost-effectiveness of production, an important consideration when modeling has shown that a cost of $2 or less per dose for a preventive vaccine would be economically advantageous over the currently available leishmaniasis treatments (25). In addition, recombinant methods also provide the opportunity to manipulate and combine complementary proteins/epitopes in a single gene product.

Our first defined vaccine against leishmaniasis came with the use of E. coli-expressed Leish-111f (L111f; LEISH-F1) that joined the L. major homologue of eukaryotic thiol-specific antioxidant (TSA), the L. major stress-inducible protein-1 (LmSTI1) and the L. braziliensis elongation and initiation factor (LeIF) into a chimeric fusion protein. Leish-111f protects mice, hamsters, and rhesus macaques when appropriately formulated with adjuvant, and LEISH-F1+ monophosphoryl lipid A (MPL)-SE was the first defined Leishmania vaccine to enter clinical trials, where it demonstrated an excellent safety profile and induced antigen-specific responses (26–29). A second, distinct E. coli-derived fusion, LEISH-F3, that combines two components that can protect in animal models of VL, nucleoside hydrolase (NH) and a sterol 24-c-methyltransferase (SMT), has also progressed through phase I clinical trial (30).

The cost-effectiveness of recombinant proteins can also be enhanced by the selection of particular expression platforms. In some instances, yeast (Saccharomyces cerevisiae or Pichia pastoris) expression systems provide benefits over E. coli expression systems, such as variable folding, glycosylation, or direct secretion into the fermentation media of the target protein as a soluble and stable protein (31, 32). An E. coli-expressed L. donovani nucleoside hydrolase (LdNH36) surface protein has provided partial protection against L. donovani infection in mice (33). Expression of LdNH36 in P. pastoris produced LdNH36-Y-WT that was of significantly higher molecular weight than the E. coli expressed protein (34). Gel analyses suggested that expression in yeast resulted in several high-mannose glycoforms, whose presence was first reduced by mutating N-linked glycosylation sites located outside the major immunogenic domain from asparagines to serines (LdNH36-dg) and then removed by mutating asparagines to glutamines. The LdNH36-dg2 product was similar in size to the nonglycosylated E. coli expressed protein, but the glutamine mutations resulted in increased expression levels. Mice immunized with LdNH36-dg2 did have high levels of antibodies that inhibited the hydrolase activity of the wild-type LdNH36 (34), although challenge experiments have not been reported.

DNA VACCINE CONSTRUCTS

Besides traditional recombinant expression approaches, many antigens have also been investigated in DNA vaccines (20). VL patients possess antibodies against the hemoglobin receptor (HbR) of Leishmania, and this protein is conserved across various Leishmania strains. Immunization with HbR-DNA generated multifunctional CD4 and CD8 T cells and was reported to provide complete (sterile) protection against L. donovani infection in both mice and hamsters (35). Given these findings, we produced recombinant HbR in E. coli to examine compatibility with our own vaccine candidates. Surprisingly, unlike our previous data indicating various candidates that retained their protective properties when expressed in E. coli (36), we did not observe protection in mice that were immunized with HbR in conjunction with the glucopyranosyl lipid adjuvant-stable emulsion (GLA-SE) (Fig. 1). Furthermore, adding HbR as a component within fusion proteins disrupted their ability to confer protection. We still do not understand why these differences arose, but it is possible that differential processing of epitopes may occur, or some DNA vaccines may target different antigen-presenting cells than protein/adjuvant. While subtle, such changes may be enough to lead to critical variations in the protective efficacy of the respective vaccines.

FIG 1
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FIG 1

Influence of expression system on the protective efficacy of immunization with HbR. (A) Leishmania HbR was delivered as a DNA vaccine, either as full-length HbR (HbR-FL) or HbR-N coding sequence, intramuscularly into BALB/c mice. The L. donovani load per milligram of liver homogenate was determined 60 days after infection (inset shows real-time PCR [RT-PCR] results). Data are shown as mean and standard error of the mean (SEM), with 8 mice per group. (Republished from reference 35 with permission of the publisher.) (B) Mice were injected a total of 3 times with 5 μg E. coli-expressed recombinant protein formulated with GLA-SE and then 1 month after the final immunization were infected by intravenous injection of L. donovani promastigotes. Mice received either LEISH-F3 (30), protein derived from HbR-N, or a chimeric fusion of F3-HbR. These procedures were conducted in accordance with animal handling protocols approved by the IDRI institutional animal care and use committee. Livers were removed 1 month after parasite inoculation, and burdens were determined by quantitative PCR (qPCR). Data are shown as mean and SEM, with 7 mice per group.

Fused targets can also be created within DNA vaccines, and seven Leishmania genes (H2A, H2B, H3, H4, A2, KMP11, and HSP70) are encoded within the HisAK70 DNA-vaccine (37). In the VL model, HisAK70-immunized mice exhibited many sterile hepatic granulomas associated with the resolution of hepatic parasite burdens, and in the CL model, spread of parasites to the viscera was completely inhibited in HisAK70-immunized mice. The results suggest that immunization with the HisAK70 DNA may provide a rapid, suitable, and efficient vaccination strategy to confer cross-protective immunity against VL and CL.

BACTERIAL AND VIRAL VECTORS

In terms of bacterial vectors, Listeria monocytogenes, Mycobacterium bovis BCG, and Salmonella enterica serovar Typhimurium have all been used as vehicles to deliver Leishmania targets (20). As an example of this approach, novel Leishmania parasite antigens were selected by an in silico proteomic approach and expressed in the vector Salmonella Typhimurium SL3261. Immunization of mice with individual Salmonella vaccine strains expressing the antigens LinJ08.1190 and LinJ23.0410, or a mixture of these bacilli, significantly delayed the progression of L. major and enhanced systemic resistance against L. donovani (38). These data identify Salmonella as another valid vaccine carrier for inducing protection against VL. Given that 2 antigens that were also selected and expressed did not protect, however, this Salmonella system may not be appropriate for all antigens.

With regard to viral vectors, the most advanced is a nonreplicative adenovirus vector encoding the A2 antigen (Ad5-A2) that has progressed to L. infantum challenge in macaques (39). Using a variety of prime boost schemes involving Ad5-A2 as well as recombinant protein and a plasmid DNA-encoding A2 gene (DNA-A2), parasite burdens in the liver were lower in immunized macaques and correlated with hepatic granuloma resolution and the reduction of clinical symptoms. Considering the importance of both CD4 and CD8 T cells in the control of Leishmania infection, we recently generated an adenoviral vector expressing the F3 protein (Ad5-F3) to complement the use of recombinant F3 and investigated immunization strategies with the promise of generating combined protective T-cell responses (40). Overall, a F3+GLA-SE prime/Ad5-F3 boost strategy induced the best combined CD4 and CD8 T cell memory response, although we also found that simultaneous immunization with Ad5-F3 and F3+GLA-SE in a single injection was potent enough to provide protection. As an alternative, although only limited experimental information regarding the effectiveness for use against human pathogens is available, the NYVAC poxvirus vector has also recently been explored (41). Using DNA prime/virus boost protocols, a replication-competent NYVAC expressing LACK (Leishmania homologue of mammalian RACKs, the receptors for activated C kinase) (NYVAC-LACK-C7L) induced more polyfunctional CD4 and CD8 T cell responses and greater protection against L. major than nonreplicating NYVAC-LACK.

CLOSING REMARKS

A great number of defined antigens, delivered as recombinant protein in adjuvant, as plasmid DNA, or within vector systems, have provided protection in animal models of leishmaniasis. In an attempt to consolidate information generated across many platforms, we recently selected and expressed 7 candidates as recombinant proteins in E. coli. Each recombinant protein was recognized by VL patients and, when formulated with the Th1-potentiating adjuvant GLA-SE, retained its protective efficacy against the challenge of mice with L. donovani (36). This indicates the possibility of combining candidates that have advanced in diverse vaccine platforms. It is clear, however, that the vaccine platform of choice can have a significant impact upon the level of protection induced and in some instances can negate protection altogether. Thus, without actually generating independent results, vaccine developers must be cautious when navigating through the existing data and between the platforms (Table 1). On the positive side, as is seen most clearly with viral vectors, exploring interactions between these technologies has the potential to yield regimens that augment, complement, or synergize each other to yield a robust protective regimen.

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TABLE 1

Impact of production system on protective efficacy of Leishmania-specific vaccine targetsa

ACKNOWLEDGMENTS

This work was funded by the National Institute of Allergy and Infectious Diseases of the National Institutes of Health under award R01AI025038. Additional program support came from the Bill and Melinda Gates Foundation under grant 631.

The content of this article is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Malcolm S. Duthie and Steven G. Reed are coinventors of a patent for leishmaniasis vaccine development.

  • Copyright © 2017 American Society for Microbiology.

All Rights Reserved .

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Author Bios

Figure1

Malcolm S. Duthie graduated with a B.Sc. degree in Immunology from the University of Glasgow, Scotland, followed by a Ph.D. in Medical Microbiology from the University of Edinburgh, Scotland. Following postdoctoral work at the University of Washington, Seattle, he joined the Infectious Disease Research Institute (IDRI) in 2002. In his role as a Senior Scientist at IDRI, Dr. Duthie's main research interests lie in determining how host/pathogen interactions can be beneficially manipulated to generate tools for practical application within disease control programs. Dr. Duthie works with an extensive network of collaborators in several countries to identify vaccine candidates and develop new diagnostic tools to improve the control of neglected tropical diseases, with a current focus on leprosy and leishmaniasis.

Figure2

Steven G. Reed graduated with a Ph.D. in Microbiology and Immunology from the University of Montana before being appointed Scientist of the National Institute of Amazon Research in Manaus, Brazil, where he directed research on tropical diseases. This research continued in Dr. Reed's capacity as manager of the Cornell-Bahia program of international medicine. Among multiple advisory positions, he has served as a member of diagnostic and vaccine steering committees of the World Health Organization. In addition to founding several biotechnology companies, in 1993 Dr. Reed established the Infectious Disease Research Institute (IDRI), where he currently serves as President and Chief Executive Officer. Dr. Reed's research interests have focused on the immunology of intracellular pathogens, with the intent of developing vaccines and diagnostics that can be made widely available in developing countries.

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Not All Antigens Are Created Equally: Progress, Challenges, and Lessons Associated with Developing a Vaccine for Leishmaniasis
Malcolm S. Duthie, Steven G. Reed
Clinical and Vaccine Immunology Jul 2017, 24 (7) e00108-17; DOI: 10.1128/CVI.00108-17

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Not All Antigens Are Created Equally: Progress, Challenges, and Lessons Associated with Developing a Vaccine for Leishmaniasis
Malcolm S. Duthie, Steven G. Reed
Clinical and Vaccine Immunology Jul 2017, 24 (7) e00108-17; DOI: 10.1128/CVI.00108-17
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  • Top
  • Article
    • ABSTRACT
    • INTRODUCTION
    • POTENTIAL FOR VACCINES
    • PURIFIED RECOMBINANT PROTEINS
    • DNA VACCINE CONSTRUCTS
    • BACTERIAL AND VIRAL VECTORS
    • CLOSING REMARKS
    • ACKNOWLEDGMENTS
    • REFERENCES
    • Author Bios
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KEYWORDS

Antigens, Protozoan
Leishmania
Leishmaniasis
Leishmaniasis Vaccines
Leishmania
adjuvants
protein
vaccine
vector

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