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Animal: DNA Viruses |
Departments of Microbiology and Immunology1 and Medicine2, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
Author for correspondence: Barney Graham. Present address: Vaccine Research Center, NIAID/NIH, Building 40, Room 2502, 40 Convent Drive, MSC 3017, Bethesda, MD 20892-3017, USA. Fax +1 301 480 2771. e-mail bgraham{at}nih.gov
Recombinant vaccinia viruses are well-characterized tools that can be used to define novel approaches to vaccine formulation and delivery. While vector co-expression of immune mediators has enormous potential for optimizing the composition of vaccine-induced immune responses, the impact on antigen expression and vector antigenicity must also be considered. Co-expression of IL-4 increased vaccinia virus vector titres, while IFN-
co-expression reduced vaccinia virus replication in BALB/c mice and in C57BL/6 mice infected with some recombinant viruses. Protection against respiratory syncytial virus (RSV) challenge was similar in mice immunized with vaccinia virus expressing RSV G glycoprotein and IFN-
, even though the replication efficiency of the vector was diminished. These data demonstrate the ability of vector-expressed cytokine to influence the virulence of the vector and to direct the development of selected immune responses. This suggests that the co-expression of cytokines and other immunomodulators has the potential to improve the safety of vaccine vectors while improving the immunogenicity of vaccine antigens.
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