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Journal of Virology, May 2001, p. 4752-4760, Vol. 75, No. 10
University of Rochester Medical Center,
Rochester, New York1; Tulane University,
New Orleans, Louisiana2; and University
of Cape Town, Cape Town, Republic of South
Africa3
Received 6 October 2000/Accepted 13 February 2001
Certain human papillomaviruses (HPVs) cause most cervical cancer,
which remains a significant source of morbidity and mortality among
women worldwide. HPV recombinant virus-like particles (VLPs) are
promising vaccine candidates for controlling anogenital HPV disease and
are now being evaluated as a parenteral vaccine modality in human
subjects. Vaccines formulated for injection generally are more costly,
more difficult to administer, and less acceptable to recipients than
are mucosally administered vaccines. Since oral delivery represents an
attractive alternative to parenteral injection for large-scale human
vaccination, the oral immunogenicity of HPV type 11 (HPV-11) VLPs in
mice was previously investigated; it was found that a modest systemic
neutralizing antibody response was induced (R. C. Rose, C. Lane,
S. Wilson, J. A. Suzich, E. Rybicki, and A. L. Williamson,
Vaccine 17:2129-2135, 1999). Here we examine whether VLPs
of other genotypes may also be immunogenic when administered orally and
whether mucosal adjuvants can be used to enhance VLP oral
immunogenicity. We show that HPV-16 and HPV-18 VLPs are immunogenic
when administered orally and that oral coadministration of these
antigens with Escherichia coli heat-labile enterotoxin (LT)
mutant R192G (LT R192G) or CpG DNA can significantly improve anti-VLP
humoral responses in peripheral blood and in genital mucosal
secretions. Our results also suggest that LT R192G may be superior to
CpG DNA in this ability. These findings support the concept of oral
immunization against anogenital HPV disease and suggest that clinical
studies involving this approach may be warranted.
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.10.4752-4760.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Human Papillomavirus Virus-Like Particles Are
Efficient Oral Immunogens when Coadministered with Escherichia
coli Heat-Labile Enterotoxin Mutant R192G or CpG
DNA
*
Corresponding author. Mailing address: University of
Rochester Medical Center, Department of Medicine, Box 689, 601 Elmwood Ave., Rochester, NY 14642. Phone: (716) 275-5871. Fax: (716) 442-9328. E-mail: Robert_Rose{at}urmc.rochester.edu.
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