A Novel DNA Vaccine Platform Enhances Neo-antigen-like T Cell Responses against WT1 to Break Tolerance and Induce Anti-tumor Immunity

Tumor-associated antigens have emerged as important immunotherapeutic targets in the fight against cancer. Germline tumor antigens, such as WT1, Wilms’ tumor gene 1, are overexpressed in many human malignancies but have low expression in somatic tissues. Recent vaccination approaches to target WT1 h...

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Veröffentlicht in:Molecular therapy 2017-04, Vol.25 (4), p.976-988
Hauptverfasser: Walters, Jewell N., Ferraro, Bernadette, Duperret, Elizabeth K., Kraynyak, Kimberly A., Chu, Jaemi, Saint-Fleur, Ashley, Yan, Jian, Levitsky, Hy, Khan, Amir S., Sardesai, Niranjan Y., Weiner, David B.
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container_end_page 988
container_issue 4
container_start_page 976
container_title Molecular therapy
container_volume 25
creator Walters, Jewell N.
Ferraro, Bernadette
Duperret, Elizabeth K.
Kraynyak, Kimberly A.
Chu, Jaemi
Saint-Fleur, Ashley
Yan, Jian
Levitsky, Hy
Khan, Amir S.
Sardesai, Niranjan Y.
Weiner, David B.
description Tumor-associated antigens have emerged as important immunotherapeutic targets in the fight against cancer. Germline tumor antigens, such as WT1, Wilms’ tumor gene 1, are overexpressed in many human malignancies but have low expression in somatic tissues. Recent vaccination approaches to target WT1 have been hampered by poor in vivo immune potency, likely due to the conserved self-antigen nature of WT1. In this study, we use a novel synthetic micro-consensus SynCon DNA vaccine approach with the goal of breaking tolerance and increasing vaccine immune potency. This approach induced new, neo-antigen-like responses that were superior to those induced by native WT1 DNA immunogens for driving T cell immunity and breaking tolerance. Non-human primates (NHPs) vaccinated with SynCon WT1 antigens elicited immune responses against native rhesus WT1 peptides. When delivered by electroporation (EP) in mice, SynCon-based WT1 constructs elicited strong CD4 and CD8 T cell responses (including IFN-γ, CD107a, and TNF-α) to both native and consensus peptides. In addition, SynCon WT1 vaccine-induced antibodies recognized native WT1 in vitro. Vaccination with the SynCon WT1 immunogens was capable of slowing tumor growth in therapeutic models in vivo. These data support the further study of synthetic consensus DNA vaccines for breaking tolerance to important germline antigens. Breaking tolerance to tumor-associated self-antigens is a major challenge for cancer immune therapy. Here, Walters et al. report a novel DNA vaccine design strategy using consensus sequences to help break tolerance and induce a neo-antigen-like response to the germline antigen WT1.
doi_str_mv 10.1016/j.ymthe.2017.01.022
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Germline tumor antigens, such as WT1, Wilms’ tumor gene 1, are overexpressed in many human malignancies but have low expression in somatic tissues. Recent vaccination approaches to target WT1 have been hampered by poor in vivo immune potency, likely due to the conserved self-antigen nature of WT1. In this study, we use a novel synthetic micro-consensus SynCon DNA vaccine approach with the goal of breaking tolerance and increasing vaccine immune potency. This approach induced new, neo-antigen-like responses that were superior to those induced by native WT1 DNA immunogens for driving T cell immunity and breaking tolerance. Non-human primates (NHPs) vaccinated with SynCon WT1 antigens elicited immune responses against native rhesus WT1 peptides. When delivered by electroporation (EP) in mice, SynCon-based WT1 constructs elicited strong CD4 and CD8 T cell responses (including IFN-γ, CD107a, and TNF-α) to both native and consensus peptides. In addition, SynCon WT1 vaccine-induced antibodies recognized native WT1 in vitro. Vaccination with the SynCon WT1 immunogens was capable of slowing tumor growth in therapeutic models in vivo. These data support the further study of synthetic consensus DNA vaccines for breaking tolerance to important germline antigens. Breaking tolerance to tumor-associated self-antigens is a major challenge for cancer immune therapy. 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Germline tumor antigens, such as WT1, Wilms’ tumor gene 1, are overexpressed in many human malignancies but have low expression in somatic tissues. Recent vaccination approaches to target WT1 have been hampered by poor in vivo immune potency, likely due to the conserved self-antigen nature of WT1. In this study, we use a novel synthetic micro-consensus SynCon DNA vaccine approach with the goal of breaking tolerance and increasing vaccine immune potency. This approach induced new, neo-antigen-like responses that were superior to those induced by native WT1 DNA immunogens for driving T cell immunity and breaking tolerance. Non-human primates (NHPs) vaccinated with SynCon WT1 antigens elicited immune responses against native rhesus WT1 peptides. When delivered by electroporation (EP) in mice, SynCon-based WT1 constructs elicited strong CD4 and CD8 T cell responses (including IFN-γ, CD107a, and TNF-α) to both native and consensus peptides. In addition, SynCon WT1 vaccine-induced antibodies recognized native WT1 in vitro. Vaccination with the SynCon WT1 immunogens was capable of slowing tumor growth in therapeutic models in vivo. These data support the further study of synthetic consensus DNA vaccines for breaking tolerance to important germline antigens. Breaking tolerance to tumor-associated self-antigens is a major challenge for cancer immune therapy. Here, Walters et al. report a novel DNA vaccine design strategy using consensus sequences to help break tolerance and induce a neo-antigen-like response to the germline antigen WT1.</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>28237837</pmid><doi>10.1016/j.ymthe.2017.01.022</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record>
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source MEDLINE; EZB-FREE-00999 freely available EZB journals; ProQuest Central UK/Ireland; PubMed Central; Alma/SFX Local Collection
subjects Amino Acid Sequence
Animal models
Animals
Antibodies - immunology
Antigen (tumor-associated)
Antigens
Antigens, Neoplasm - immunology
Autoantigens
Cancer
Cancer Vaccines - immunology
CD4 antigen
CD8 antigen
Cell Line, Tumor
Cytokines - metabolism
Deoxyribonucleic acid
Disease Models, Animal
DNA
DNA damage
DNA vaccines
Electroporation
Epitopes, T-Lymphocyte - immunology
Female
Gene Expression
Growth factors
Humans
Immune Tolerance
Immunity
Immunodominant Epitopes - chemistry
Immunodominant Epitopes - immunology
Immunological tolerance
Leukemia
Lymphocyte Subsets - immunology
Lymphocyte Subsets - metabolism
Lymphocytes
Lymphocytes T
Macaca mulatta
Male
Mesothelioma
Mice
Mutation
neo-antigen
Neoplasms - immunology
Neoplasms - mortality
Neoplasms - pathology
Neoplasms - therapy
Original
Patients
Peptides
Peptides - immunology
Pharmaceutical industry
Proteins
Stock options
Studies
T cell receptors
Tumor necrosis factor-α
Tumors
Vaccination
Vaccines
Vaccines, DNA - immunology
WT1
WT1 Proteins - immunology
γ-Interferon
title A Novel DNA Vaccine Platform Enhances Neo-antigen-like T Cell Responses against WT1 to Break Tolerance and Induce Anti-tumor Immunity
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