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Epitope발현 DNA vaccine과 recombinant vaccinia virus를 이용한 heterologous prime-boost vaccination에 의하여 유도되는 CD8+ T 세포 매개성 면역

CD8+ T Cell-mediated Immunity Induced by Heterologous Prime-boost Vaccination Based on DNA Vaccine and Recombinant Vaccinia Virus Expressing Epitope

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Abstract

Background: DNA vaccination represents an anticipated approach for the control of numerous infectious diseases. Used alone, however, DNA vaccine is weak immunogen inferior to viral vectors. In recent, heterologous prime-boost vaccination leads DNA vaccines to practical reality. Methods: We assessed prime-boost immunization strategies with a DNA vaccine (minigene, gB498-505 DNA) and recombinant vaccinia virus (vvgB498- 505) expressing epitope gB498-505 (SSIEFARL) of CD8 T cells specific for glycoprotein B (gB) of herpes simplex virus (HSV). Animals were immunized primarily with gB498-505 epitope-expressing DNA vaccine/recombinant vaccinia virus and boosted with alternative vaccine type expressing entire Ag. Results: In prime-boost protocols using vvgBw (recombinant vaccinia virus expressing entire Ag) and vvgB498-505, CD8 T cell-mediated immunity was induced maximally at both acute and memory stages if primed with vvgBw and boosted with vvgB498-505 as evaluated by CTL activity, intracellular IFN-staining, and MHC class I tetramer staining. Similarly gB498-505 DNA prime-gBw DNA (DNA vaccine expressing entire Ag) boost immunization elicited the strongest CD8 T cell responses in protocols based on DNA vaccine. However, the level of CD8 T cell-mediated immunity induced with prime-boost vaccination using DNA vaccine expressing epitope or entire Ag was inferior to those based on vvgBw and vvgB498-505. Of particular interest CD8 T cell-mediated immunity was optimally induced when vvgB498-505 was used to prime and gB DNA was used as alternative boost. Especially CD8 T cell responses induced by such protocol was longer lasted than other protocols. Conclusion: These facts direct to search for the effective strategy to induce optimal CD8 T cell-mediated immunity against cancer and viral infection.

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