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Title: Endogenous interleukin-4 downregulates the type 1 CD4 T cell-mediated immune response induced by intramuscular DNA immunization
Authors: Rodrigues, M. M.
Soares, MBP
Vasconcelos, JRC
Universidade Federal de São Paulo (UNIFESP)
Fdn Oswaldo Cruz
Issue Date: 1-Nov-2002
Publisher: Mary Ann Liebert Inc Publ
Citation: Journal of Interferon and Cytokine Research. Larchmont: Mary Ann Liebert Inc Publ, v. 22, n. 11, p. 1137-1141, 2002.
Abstract: Intramuscular (i.m.) administration of eukaryotic plasmid vectors containing foreign genes is a general immunization strategy capable of inducing protective type 1 immune responses against viral, bacterial, fungal, and parasitic infections. We have described that immunization with a plasmid containing a gene encoding a parasite antigen elicits specific type 1 protective immune responses against experimental infection with the human protozoan parasite Trypanosoma cruzi. However, we had evidence suggesting that DNA immunization concomitantly activated specific type 2 immune responses. To determine precisely the influence of the type 2 cytokine interleukin-4 (IL-4) during DNA immunization, we compared the immune responses of genetically modified IL-4-deficient or wild-type (wt) BALB/c mice. IL-4-deficient mice had a significantly lower ratio of specific serum IgG1/IgG2a, and on in vitro restimulation with antigen, their spleen cells secreted significantly higher amounts of interferon-gamma (IFN-gamma). in contrast, absence of IL-4 did not affect total serum antibody response, T cell proliferative responses, or activation of IFN-gamma-producing CD8(+) T cells. Our results suggested that in contrast to conventional adjuvants, such as alum and complete Freund's adjuvant, specific IgG1 in DNA-immunized BALB/c mice was highly dependent on IL-4. To our knowledge, our study provides the first evidence that endogenous IL-4 selectively downregulates the type 1 CD4(+) T cell-mediated immune response induced by i.m. genetic immunization, a fact that may have implications for the design of certain DNA vaccines.
ISSN: 1079-9907
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Appears in Collections:Artigo

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