Abstract
In vivo antigen targeting to dendritic cells (DCs) has been used as a way to improve immune responses. Targeting is accomplished with the use of monoclonal antibodies (mAbs) to receptors present on the DC surface fused with the antigen of interest. An anti-DEC205 mAb has been successfully used to target antigens to the DEC205+CD8α+ DC subset. The administration of low doses of the hybrid mAb together with DC maturation stimuli is able to activate specific T cells and induce production of high antibody titres for a number of different antigens. However, it is still not known if this approach would work with any fused protein. Here we genetically fused the αDEC205 mAb with two fragments (42-kDa and 19-kDa) derived from the ~200 kDa Plasmodium vivax merozoite surface protein 1 (MSP1), known as MSP142 and MSP119, respectively. The administration of two doses of αDEC-MSP142, but not of αDEC-MSP119 mAb, together with an adjuvant to two mouse strains induced high anti-MSP119 antibody titres that were dependent on CD4+ T cells elicited by peptides present in the MSP133 sequence, indicating that the presence of T cell epitopes in antigens targeted to DEC205+ DCs increases antibody responses.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Sequence
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Animals
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Antibodies, Monoclonal / genetics
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Antibodies, Monoclonal / immunology
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Antibodies, Monoclonal / metabolism
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Antibody Formation / physiology*
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CD4 Antigens / deficiency
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CD4 Antigens / genetics
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CD4-Positive T-Lymphocytes / cytology
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CD4-Positive T-Lymphocytes / immunology
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CD4-Positive T-Lymphocytes / metabolism
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Cell Proliferation
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Dendritic Cells / cytology
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Dendritic Cells / immunology*
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Dendritic Cells / metabolism
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Enzyme-Linked Immunosorbent Assay
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Epitopes, T-Lymphocyte / genetics
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Epitopes, T-Lymphocyte / immunology*
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Epitopes, T-Lymphocyte / metabolism
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Female
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Immunoglobulin G / immunology
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Immunoglobulin G / metabolism
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Interferon-gamma / metabolism
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Interleukin-2 / metabolism
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Lectins, C-Type / immunology*
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Merozoite Surface Protein 1 / chemistry
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Merozoite Surface Protein 1 / genetics
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Merozoite Surface Protein 1 / metabolism
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Mice
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Mice, Inbred C57BL
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Mice, Knockout
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Recombinant Fusion Proteins / biosynthesis
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Recombinant Fusion Proteins / chemistry
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Recombinant Fusion Proteins / immunology
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Spleen / cytology
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Spleen / metabolism
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Tumor Necrosis Factor-alpha / metabolism
Substances
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Antibodies, Monoclonal
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CD4 Antigens
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Epitopes, T-Lymphocyte
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Immunoglobulin G
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Interleukin-2
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Lectins, C-Type
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Merozoite Surface Protein 1
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Recombinant Fusion Proteins
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Tumor Necrosis Factor-alpha
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Interferon-gamma