Abstract
To more effectively drive immune responses toward antigen-specific T helper type 2 (Th2) cellmediated responses, we constructed a mammalian expression vector (pOVA/IL4) carrying a fused gene in which the ovalbumin (OVA) cDNA was covalently linked to murine interleukin-4 (IL-4) cDNA. A biologically active OVA/IL4 protein was expressed by the transfected COS cells with the pOVA/IL4 DNA, as demonstrated by Western blotting and cytokine bioassay. Intramuscular injection of BALB/c mice with the pOVA/IL4 DNA increased both the production of OVA-specific IL-4 by CD4+ T cells and the ratio of anti-OVA IgG1 to anti-OVA IgG2a isotypes, while the injection with the pOVA DNA alone, or with the mixture of the pOVA and plL4 DNA did no or little increase. Furthermore, the OVA-specific, Th2 cell-mediated immune responses were significantly enhanced by multiple injections with the pOVA/IL4 DNA. These studies indicate that the direct linkage of an OVA gene to an IL-4 gene in the expression plasmid confines the effects of IL-4 to the OVA-specific cells, efficiently driving the immune response toward OVA-specific., Th2 cell-mediated responses.
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Lim, Y.S., Kang, B.Y., Kim, E.J. et al. Vaccination with an ovalbumin/interleukin-4 fusion DNA efficiently induces Th2 cell-mediated immune responses in an ovalbumin-specific manner. Arch. Pharm. Res. 21, 537–542 (1998). https://doi.org/10.1007/BF02975371
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DOI: https://doi.org/10.1007/BF02975371