DNA Priming-Protein Boosting Enhances Both Antigen-Specific Antibody and Th1-Type Cellular Immune Responses in a Murine Herpes Simplex Virus-2 gD Vaccine Model

Sin, Jeong-Im; Bagarazzi, Mark; Pachuk, Catherine; Weiner, David B.
October 1999
DNA & Cell Biology;Oct99, Vol. 18 Issue 10, p771
Academic Journal
It has previously been reported that herpes simplex virus (HSV)-2 gD DNA vaccine preferentially induces Thelper (Th) 1-type cellular immune responses, whereas the literature supports the view that subunit vaccines tend to induce potent antibody responses, supporting a Th2 bias. Here, using an HSV gD vaccine model, we investigated whether priming and boosting with a DNA or protein vaccine could induce both potent antibody and Th1-type cellular immune responses. When animals were primed with DNA and boosted with protein, both antibody and Th-cell proliferative responses were significantly enhanced. Furthermore, production of Th1-type cytokines (interleukin-2, interferion-gamma) was enhanced by DNA priming-protein boosting. In contrast, protein priming-DNA boosting produced antibody levels similar to those following protein-protein vaccination but failed to further enhance Th-cell proliferative responses or cytokine production. DNA priming-protein boosting resulted in an increased IgG2a isotype (a Th1 indicator) profile, similar to that induced by DNA-DNA vaccination, whereas protein priming-DNA boosting caused an increased IgG1 isotype (a Th2 indicator) profile similar to that seen after protein-protein vaccination. This result indicates that preferential induction of IgG1 or IgG2a isotype is determined by the type of priming vaccine used. Thus, this study suggests that HSV DNA priming-protein boosting could elicit both potent Th1-type cellular immune responses and antibody responses, both of which likely are important for protection against HSV infection.


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