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“Immunoinformatic Identification of T-Cell and B-Cell Epitopes From Giardia lamblia Immunogenic Proteins as Candidates to Develop Peptide-Based Vaccines Against Giardiasis”

Garzon, Thania, Ortega-Tirado, David, Lopez-Romero, Gloria, Alday, Efrain, Robles-Zepeda, Ramón Enrique, Garibay-Escobar, Adriana, Velazquez, Carlos·2021·Frontiers in Cellular and Infection Microbiology
DOI 10.3389/fcimb.2021.769446PMC PMC8579046
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Abstract

Giardiasis is one of the most common gastrointestinal infections worldwide, mainly in developing countries. The etiological agent is the Giardia lamblia parasite. Giardiasis mainly affects children and immunocompromised people, causing symptoms such as diarrhea, dehydration, abdominal cramps, nausea, and malnutrition. In order to develop an effective vaccine against giardiasis, it is necessary to understand the host-Giardia interactions, the immunological mechanisms involved in protection against infection, and to characterize the parasite antigens that activate the host immune system. In this study, we identify and characterize potential T-cell and B-cell epitopes of Giardia immunogenic proteins by immunoinformatic approaches, and we discuss the potential role of those epitopes to stimulate the host´s immune system. We selected the main immunogenic and protective proteins of Giardia experimentally investigated. We predicted T-cell and B-cell epitopes using immunoinformatic tools (NetMHCII and BCPREDS). Variable surface proteins (VSPs), structural (giardins), metabolic, and cyst wall proteins were identified as the more relevant immunogens of G. lamblia. We described the protein sequences with the highest affinity to bind MHC class II molecules from mouse (I-A k and I-A d) and human (DRB1*03:01 and DRB1*13:01) alleles, as well as we selected promiscuous epitopes, which bind to the most common range of MHC class II molecules in human population. In addition, we identified the presence of conserved epitopes within the main protein families (giardins, VSP, CWP) of Giardia. To our knowledge, this is the first in silico study that analyze immunogenic proteins of G. lamblia by combining bioinformatics strategies to identify potential T-cell and B-cell epitopes, which can be potential candidates in the development of peptide-based vaccines. The bioinformatics analysis demonstrated in this study provides a deeper understanding of the Giardia immunogens that bind to critical molecules of the host immune system, such as MHC class II and antibodies, as well as strategies to rational design of peptide-based vaccine against giardiasis.

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Figure 1 Flowchart of study design. Analysis started from the bibliographic search and selection of G. lamblia proteins reported as immunogenic. Prediction of T- and B-cell epitopes and screening analyses were performed to propose candidate peptides for the vaccine design, such as promiscuous and conservation epitope analysis, and host (human and mouse) homology analysis.
Figure 1 Flowchart of study design. Analysis started from the bibliographic search and selection of G. lamblia proteins reported as immunogenic. Prediction of T- and B-cell epitopes and screening analyses were performed to propose candidate peptides for the vaccine design, such as promiscuous and conservation epitope analysis, and host (human and mouse) homology analysis.CC BY · PubMed Central
Figure 2 Schematic representation of cellular localization of immunogenic proteins of G. lamblia. A total of 29 proteins have been reported as immunogenic antigens in the cyst and trophozoite of G. lamblia. Immunogenic proteins were classified based on their location and function in structural proteins, metabolic proteins heat shock proteins (HSPs), variable-specific surface proteins (VSPs), and cyst wall proteins (CWPs). Proteins were located in ventral disc, plasma membrane, cytoskeleton, intracellular and secretome/extracellular of the parasite. CWPs can also be found in encystation-specific secretory vesicles (ESV).
Figure 2 Schematic representation of cellular localization of immunogenic proteins of G. lamblia. A total of 29 proteins have been reported as immunogenic antigens in the cyst and trophozoite of G. lamblia. Immunogenic proteins were classified based on their location and function in structural proteins, metabolic proteins heat shock proteins (HSPs), variable-specific surface proteins (VSPs), and cyst wall proteins (CWPs). Proteins were located in ventral disc, plasma membrane, cytoskeleton, intracellular and secretome/extracellular of the parasite. CWPs can also be found in encystation-specific secretory vesicles (ESV).CC BY · PubMed Central
Figure 3 Distribution of T-cell and B- cell epitopes from G. lamblia immunogens. (A) T-cell epitope count for each immunogenic protein. The total count of the T- cell epitopes (strong and weak binders) was performed by the prediction in NetMHCII of MHC class II (I-Ak, I-Ad, DRB1*03:01, DRB1*13:01). (B) B-cell epitope count for each immunogenic protein. Epitope prediction of length 16 and 18 amino acids was conducted in BCPRED.
Figure 3 Distribution of T-cell and B- cell epitopes from G. lamblia immunogens. (A) T-cell epitope count for each immunogenic protein. The total count of the T- cell epitopes (strong and weak binders) was performed by the prediction in NetMHCII of MHC class II (I-Ak, I-Ad, DRB1*03:01, DRB1*13:01). (B) B-cell epitope count for each immunogenic protein. Epitope prediction of length 16 and 18 amino acids was conducted in BCPRED.CC BY · PubMed Central
Figure 4 Giardins, VSPs, and CWPs conserved T-cell and B-cell epitopes. Epitope conservation analysis with a cutoff > 60% conservancy for giardins (A) and VSPs (B), a cutoff > 50% conservancy for CWPs (C). The regions shown in green, and blue are T-cell and B-cell epitopes, respectively. Conserved epitopes shown in this figure are found in Tables 6 – 8 .
Figure 4 Giardins, VSPs, and CWPs conserved T-cell and B-cell epitopes. Epitope conservation analysis with a cutoff > 60% conservancy for giardins (A) and VSPs (B), a cutoff > 50% conservancy for CWPs (C). The regions shown in green, and blue are T-cell and B-cell epitopes, respectively. Conserved epitopes shown in this figure are found in Tables 6 – 8 .CC BY · PubMed Central

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Cited by

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Metadata

Authors
Garzon, T., Ortega-Tirado, D., Lopez-Romero, G., Alday, E., Robles-Zepeda, R. E., Garibay-Escobar, A., & Velazquez, C.
Venue
Frontiers in Cellular and Infection Microbiology
Publisher
Frontiers Media SA
Published
2021-10-27
Volume
11
ISSN
2235-2988
DOI
10.3389/fcimb.2021.769446
PMC
PMC8579046
Cited by
14
References
2
Licence
creativecommons.org/licenses/by/4.0/ (vor)
Funders
Consejo Nacional de Ciencia y Tecnología

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