Dendritic cell (DC)-based vaccines have been used to generate Th1-mediated, protective immunity against cancers and infectious microorganisms. As an attempt to develop a new vaccine protocol for the induction of Th2-directed responses, we introduced an IL-4 plasmid vector into the XS106 DC line (derived from A/J mice). Although relatively small fractions of XS106 cells exhibited apparent intracellular deposition of IL-4, they secreted biologically relevant amounts of the cytokine. IL-4-transduced XS106 DC and control XS106 DC transfected with vector alone were pulsed with KLH and injected s.c. into A/J mice. The overall magnitude of KLH-specific cellular and humoral responses was comparable between the two animal groups. However, they differed in the isotype profile albeit only transiently, with the IL-4-transduced DC group showing higher IgE and lower IgG2a responses, and in the cytokine profile, with spleen cells isolated from the IL-4-transduced DC group producing higher IL-13 and lower IL-12. Thus, delivery of IL-4 gene to relatively small numbers of DC is sufficient to modify the immunological outcome of DC-based vaccines. Copyright (C) 2000 Elsevier Science Ltd.
- Dendritic cells
- Th2-biased immune responses
ASJC Scopus subject areas
- Molecular Medicine
- Immunology and Microbiology(all)
- Public Health, Environmental and Occupational Health
- Infectious Diseases