Rational design of DNA vaccines for the induction of human papillomavirus type 16 E6- and E7-specific cytotoxic T-cell responses
Many DNA vaccine candidates have been developed for the treatment of human papillomavirus type 16 (HPV16)-induced malignancies. Most of these vaccines consist of a fusion of E7 with a "carrier-protein" that functions to increase the potency of the vaccine. The nature of these carrier-prote...
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| Published in: | Human gene therapy Vol. 23; no. 12; p. 1301 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
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United States
01.12.2012
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| ISSN: | 1557-7422, 1557-7422 |
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| Abstract | Many DNA vaccine candidates have been developed for the treatment of human papillomavirus type 16 (HPV16)-induced malignancies. Most of these vaccines consist of a fusion of E7 with a "carrier-protein" that functions to increase the potency of the vaccine. The nature of these carrier-proteins varies widely, and the mechanisms proposed to explain the enhanced immunogenicity of such fusions are often linked to the biological function of the carrier-protein. However, the potentiating effect of these carrier-proteins might also be explained by more general mechanisms, such as the provision of CD4+ T-cell help, increased antigen stability, or altered subcellular localization of the antigen. To assess whether these more generic mechanisms could suffice to generate highly immunogenic DNA vaccines, we evaluated a series of modular HPV16 E7 DNA vaccines in which the presence of CD4+ T-cell help, the presence of an endogenous carrier-protein, and the subcellular localization of the antigen could be systematically altered. Using this approach, we demonstrate that the addition of an element that provides CD4+ T-cell help, elements that enforce endoplasmic reticulum (ER) localization/retention are both necessary and sufficient to create markedly effective HPV16 E7-directed DNA vaccines. Importantly, the resulting design rules also apply to an HPV16 E6-directed DNA vaccine. The developed "HELP(ER)" HPV DNA vaccines encode only very limited additional sequences besides the antigen, thereby reducing the risk of antigenic competition and/or autoimmunity. |
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| AbstractList | Many DNA vaccine candidates have been developed for the treatment of human papillomavirus type 16 (HPV16)-induced malignancies. Most of these vaccines consist of a fusion of E7 with a "carrier-protein" that functions to increase the potency of the vaccine. The nature of these carrier-proteins varies widely, and the mechanisms proposed to explain the enhanced immunogenicity of such fusions are often linked to the biological function of the carrier-protein. However, the potentiating effect of these carrier-proteins might also be explained by more general mechanisms, such as the provision of CD4+ T-cell help, increased antigen stability, or altered subcellular localization of the antigen. To assess whether these more generic mechanisms could suffice to generate highly immunogenic DNA vaccines, we evaluated a series of modular HPV16 E7 DNA vaccines in which the presence of CD4+ T-cell help, the presence of an endogenous carrier-protein, and the subcellular localization of the antigen could be systematically altered. Using this approach, we demonstrate that the addition of an element that provides CD4+ T-cell help, elements that enforce endoplasmic reticulum (ER) localization/retention are both necessary and sufficient to create markedly effective HPV16 E7-directed DNA vaccines. Importantly, the resulting design rules also apply to an HPV16 E6-directed DNA vaccine. The developed "HELP(ER)" HPV DNA vaccines encode only very limited additional sequences besides the antigen, thereby reducing the risk of antigenic competition and/or autoimmunity.Many DNA vaccine candidates have been developed for the treatment of human papillomavirus type 16 (HPV16)-induced malignancies. Most of these vaccines consist of a fusion of E7 with a "carrier-protein" that functions to increase the potency of the vaccine. The nature of these carrier-proteins varies widely, and the mechanisms proposed to explain the enhanced immunogenicity of such fusions are often linked to the biological function of the carrier-protein. However, the potentiating effect of these carrier-proteins might also be explained by more general mechanisms, such as the provision of CD4+ T-cell help, increased antigen stability, or altered subcellular localization of the antigen. To assess whether these more generic mechanisms could suffice to generate highly immunogenic DNA vaccines, we evaluated a series of modular HPV16 E7 DNA vaccines in which the presence of CD4+ T-cell help, the presence of an endogenous carrier-protein, and the subcellular localization of the antigen could be systematically altered. Using this approach, we demonstrate that the addition of an element that provides CD4+ T-cell help, elements that enforce endoplasmic reticulum (ER) localization/retention are both necessary and sufficient to create markedly effective HPV16 E7-directed DNA vaccines. Importantly, the resulting design rules also apply to an HPV16 E6-directed DNA vaccine. The developed "HELP(ER)" HPV DNA vaccines encode only very limited additional sequences besides the antigen, thereby reducing the risk of antigenic competition and/or autoimmunity. Many DNA vaccine candidates have been developed for the treatment of human papillomavirus type 16 (HPV16)-induced malignancies. Most of these vaccines consist of a fusion of E7 with a "carrier-protein" that functions to increase the potency of the vaccine. The nature of these carrier-proteins varies widely, and the mechanisms proposed to explain the enhanced immunogenicity of such fusions are often linked to the biological function of the carrier-protein. However, the potentiating effect of these carrier-proteins might also be explained by more general mechanisms, such as the provision of CD4+ T-cell help, increased antigen stability, or altered subcellular localization of the antigen. To assess whether these more generic mechanisms could suffice to generate highly immunogenic DNA vaccines, we evaluated a series of modular HPV16 E7 DNA vaccines in which the presence of CD4+ T-cell help, the presence of an endogenous carrier-protein, and the subcellular localization of the antigen could be systematically altered. Using this approach, we demonstrate that the addition of an element that provides CD4+ T-cell help, elements that enforce endoplasmic reticulum (ER) localization/retention are both necessary and sufficient to create markedly effective HPV16 E7-directed DNA vaccines. Importantly, the resulting design rules also apply to an HPV16 E6-directed DNA vaccine. The developed "HELP(ER)" HPV DNA vaccines encode only very limited additional sequences besides the antigen, thereby reducing the risk of antigenic competition and/or autoimmunity. |
| Author | Aleyd, Esil Schumacher, Ton N Haanen, John B Oosterhuis, Koen Vrijland, Kim |
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| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/22971245$$D View this record in MEDLINE/PubMed |
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| SubjectTerms | Animals CD4-Positive T-Lymphocytes - immunology Cell Line Drug Design Endoplasmic Reticulum - metabolism Female Human papillomavirus 16 - immunology Humans Male Mice Mice, Inbred C57BL Oncogene Proteins, Viral - genetics Oncogene Proteins, Viral - immunology Papillomavirus E7 Proteins - genetics Papillomavirus E7 Proteins - immunology Papillomavirus Infections - prevention & control Papillomavirus Vaccines - genetics Papillomavirus Vaccines - immunology Recombinant Proteins - genetics Recombinant Proteins - immunology Repressor Proteins - genetics Repressor Proteins - immunology T-Lymphocytes, Cytotoxic - immunology Uterine Cervical Neoplasms - prevention & control Uterine Cervical Neoplasms - virology Vaccines, DNA - genetics Vaccines, DNA - immunology |
| Title | Rational design of DNA vaccines for the induction of human papillomavirus type 16 E6- and E7-specific cytotoxic T-cell responses |
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