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J Gen Virol 89 (2008), 741-750; DOI 10.1099/vir.0.83453-0

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Recombinant simian varicella viruses expressing respiratory syncytial virus antigens are immunogenic

Toby M. Ward1, Vicki Traina-Dorge2, Kara A. Davis1 and Wayne L. Gray1

1 Department of Microbiology and Immunology, 4301 West Markham Street, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
2 Tulane National Primate Research Center, Covington, LA 70433, USA

Correspondence
Wayne L. Gray
graywaynel{at}uams.edu

Recombinant simian varicella viruses (rSVVs) were engineered to express respiratory syncytial virus (RSV) antigens. The RSV surface glycoprotein G and second matrix protein M2 (22k) genes were cloned into the SVV genome, and recombinant viruses were characterized in vitro and in vivo. rSVVs were also engineered to express the membrane-anchored or secreted forms of the RSV-G protein as well as an RSV G lacking its chemokine mimicry motif (CX3C), which may have different effects on priming the host immune response. The RSV genes were efficiently expressed in rSVV/RSV-infected Vero cells as RSV-G and -M2 transcripts were detected by RT-PCR, and RSV antigens were detected by immunofluorescence and immunoblot assays. The rSVVs replicated efficiently in Vero cell culture. Rhesus macaques immunized with rSVV/RSV-G and rSVV/RSV-M2 vaccines produced antibody responses to SVV and RSV antigens. The results demonstrate that recombinant varicella viruses are suitable vectors for the expression of RSV antigens and may represent a novel vaccine strategy for immunization against both pathogens.






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