Modulation of DNA Vaccine-Elicited CD8 super(+) T-Lymphocyte Epitope Immunodominance Hierarchies
Generating broad cellular immune responses against a diversity of viral epitopes is a major goal of current vaccine strategies for human immunodeficiency virus type 1 (HIV-1) and other pathogens. Virus-specific CD8 super(+) T-lymphocyte responses, however, are often highly focused on a very limited...
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Published in | Journal of virology Vol. 80; no. 24; pp. 11991 - 11997 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
01.12.2006
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Subjects | |
Online Access | Get full text |
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Summary: | Generating broad cellular immune responses against a diversity of viral epitopes is a major goal of current vaccine strategies for human immunodeficiency virus type 1 (HIV-1) and other pathogens. Virus-specific CD8 super(+) T-lymphocyte responses, however, are often highly focused on a very limited number of immunodominant epitopes. For an HIV-1 vaccine, the breadth of CD8 super(+) T-lymphocyte responses may prove to be critical as a result of the need to cover a wide diversity of viral isolates in the population and to limit viral escape from dominant epitope-specific T lymphocytes. Here we show that epitope modification strategies can alter CD8 super(+) T-lymphocyte epitope immunodominance hierarchies elicited by a DNA vaccine in mice. Mice immunized with a DNA vaccine expressing simian immunodeficiency virus Gag lacking the dominant D super(b)-restricted AL11 epitope generated a marked and durable augmentation of responses specific for the subdominant D super(b)-restricted KV9 epitope. Moreover, anatomic separation strategies and heterologous prime-boost regimens generated codominant responses against both epitopes. These data demonstrate that dominant epitopes can dramatically suppress the immunogenicity of subdominant epitopes in the context of gene-based vaccines and that epitope modification strategies can be utilized to enhance responses to subdominant epitopes. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 content type line 23 ObjectType-Feature-2 |
ISSN: | 0022-538X 1098-5514 |