Immunization with plasmid DNA (pDNA) has the potential to overcome the difficulties of neonatal vaccination that may be required for protection against infection with respiratory syncytial virus (RSV); however, little is known about optimal delivery modalities. In this pilot study we compared mucosal delivery of pDNA encoding RSV F protein encapsulated in poly(DL-lactide-co- glycolide) with delivery of pDNA by gene-gun for the induction of immunity in mice. Intra-gastric or intra-nasal immunization with various doses of microparticles induced weak low levels of RSV-specific serum antibodies in a proportion of mice; in contrast, gene-gun vaccination led to protective immunity associated with a humoral response. Interestingly, RSV-specific antibody was detected in lung fragment cultures following intradermal vaccination with the gene-gun.
Bibliographical noteFunding Information:
We are grateful to Lisa Hyland for advice regarding fragment cultures. We thank Peter Beverley for useful discussions. The work was supported by the UK Department of Health. The views expressed in the publication are those of the authors and not necessarily those of the Department of Health.
- DNA vaccine
- Lung antibodies
- Respiratory syncytial virus