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Infect. Immun., Jan 1998, 322-329, Vol 66, No. 1
JB Livingston, S Lu, H Robinson and DJ Anderson
Vaccines are being sought for contraception and the prevention of sexually
transmitted diseases. However, progress is slow in this area largely
because of lack of information on induction of protective immune responses
in genital tract mucosa. In this study, we investigated whether in vivo
transfection with a model DNA-based antigen delivered by gene gun
technology would induce an antibody response detectable in vaginal
secretions. Female rats were immunized with plasmids encoding human growth
hormone (HGH) under the control of a cytomegalovirus promoter (pCMV/HGH)
via vaginal mucosa (V), Peyer's patch (PP), and/or abdominal skin (S)
routes. Localization of HGH in the target tissues demonstrated that all
three sites can be transfected in vivo with pCMV/HGH. Vaginal tissues
expressed roughly the same level of plasmid as skin. Antibodies to HGH were
detectable in serum and vaginal secretions in rats immunized with pCMV/HGH.
In the rats primed and boosted vaginally, vaginal immunoglobulin A (IgA)
and IgG antibody titers to HGH were sustained for at least 14 weeks,
whereas rats immunized via other routes and protocols (S/V, S/S, PP/PP, or
PP/V) did not consistently sustain significant vaginal antibody titers
beyond week 6. DNA-based immunizations administered by the gene gun may be
an effective method of inducing local immunity in the female genital tract.
Copyright © 1998, American Society for Microbiology
Immunization of the female genital tract with a DNA-based vaccine
Department of Obstetrics, Gynecology and Reproductive Biology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.
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