title: Manipulation of HIV-1 gp120-specific immune responses elicited via gene gun-based DNA immunization.
abstract: Gene gun-based DNA immunization using vectors encoding HIV-1 gp120 or influenza virus nucleoprotein result in Th2-like immune responses following successive immunizations. The codelivery of vectors encoding IL-2, IL-7, or IL-12 blocked this effect by markedly enhancing gp120-specific interferon gamma production, and suppressing IL-4 and IgG1 responses. An unbiased augmentation of all immune responses was observed by increasing the resting period between immunizations. In this case, IFN-gamma production following in vitro stimulation increased by over 1000-fold, while IL-4, IgG1, and IgG2a responses were elevated as well. Interestingly, cytokine gene codelivery, in the context of the longer resting period, provided no additional stimulation of Th1-like responses such as IFN-gamma and IgG2a production, although there was still some suppression of IL-4 production. These data demonstrate that the quality and magnitude of responses elicited following epidermal administration of DNA vaccines can be manipulated by multiple means.
authors.affiliation: Hoffman-La Roche, Dept. Immunology, Nutley, NJ 07110, USA.
authors.forename: S K
authors.initials: SK
authors.lastname: Prayaga
authors.forename: M J
authors.initials: MJ
authors.lastname: Ford
authors.forename: J R
authors.initials: JR
authors.lastname: Haynes
mesh_terms: D016915:AIDS Vaccines / Q000276:immunology*; D000818:Animals; D005260:Female; D015699:HIV Envelope Protein gp120 / Q000276:immunology*; D015497:HIV-1 / Q000276:immunology*; D007074:Immunoglobulin G / Q000096:biosynthesis / Q000145:classification; D007371:Interferon-gamma / Q000096:biosynthesis; D015847:Interleukin-4 / Q000096:biosynthesis; D051379:Mice; D008807:Mice, Inbred BALB C; D019444:Vaccines, DNA / Q000276:immunology*
chemical_list: D016915:AIDS Vaccines; D015699:HIV Envelope Protein gp120; D007074:Immunoglobulin G; D019444:Vaccines, DNA; D015847:Interleukin-4; D007371:Interferon-gamma