title: 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.
abstract: It has previously been reported that herpes simplex virus (HSV)-2 gD DNA vaccine preferentially induces T-helper (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, interferon-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.
authors.affiliation: Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia 19104, USA.
authors.forename: J I
authors.initials: JI
authors.lastname: Sin
authors.forename: M
authors.initials: M
authors.lastname: Bagarazzi
authors.forename: C
authors.initials: C
authors.lastname: Pachuk
authors.forename: D B
authors.initials: DB
authors.lastname: Weiner
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000096:biosynthesis / Q000276:immunology*; D005260:Female; D007117:Immunization, Secondary; D007074:Immunoglobulin G / Q000096:biosynthesis / Q000276:immunology; D007132:Immunoglobulin Isotypes / Q000096:biosynthesis / Q000276:immunology; D007371:Interferon-gamma / Q000096:biosynthesis; D007376:Interleukin-2 / Q000096:biosynthesis; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D018139:Simplexvirus / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology* / Q000378:metabolism; D018418:Th2 Cells / Q000276:immunology / Q000378:metabolism; D014611:Vaccination / Q000379:methods*; D019444:Vaccines, DNA / Q000276:immunology*; D014759:Viral Envelope Proteins / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral; D007074:Immunoglobulin G; D007132:Immunoglobulin Isotypes; D007376:Interleukin-2; D019444:Vaccines, DNA; D014759:Viral Envelope Proteins; C040570:glycoprotein D-herpes simplex virus type 2; D007371:Interferon-gamma