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Journal of Virology, October 2000, p. 9712-9716, Vol. 74, No. 20
Jake Gittlen Cancer Research Institute,
Department of Pathology,1 Department of
Comparative Medicine,2 and Department of
Microbiology and Immunology,3 Pennsylvania State
University College of Medicine, Hershey, Pennsylvania 17033
Received 15 May 2000/Accepted 20 July 2000
Malignant progression is a life-threatening consequence of human
papillomavirus-associated lesions. In this study, we tested the
efficacy of papillomavirus early-gene-based vaccines for prevention of
carcinoma development of papillomavirus-induced skin papillomas on
rabbits. Rabbit skin papillomas were initiated by infection with
cottontail rabbit papillomavirus (CRPV). The papillomas were allowed to
grow for 3 months without any treatment intervention. Rabbits were then
immunized by gene gun-mediated intracutaneous administration of four
DNA plasmids encoding CRPV E1, E2, E6, and E7 genes, respectively. All
eight control rabbits receiving vector alone developed invasive
carcinoma within 8 to 13 months. In contrast, only two of eight
vaccinated rabbits developed carcinoma at 12 and 15 months,
respectively. Papilloma growth was suppressed in the majority of
vaccinated rabbits but not completely eradicated. These results
indicate that gene gun-mediated immunization with papillomavirus early
genes may be a promising strategy for prevention of malignant
progression of human papillomavirus-associated lesions in humans.
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
DNA Vaccination Prevents and/or Delays Carcinoma Development of
Papillomavirus-Induced Skin Papillomas on Rabbits
*
Corresponding author. Mailing address: Jake Gittlen
Cancer Research Institute, Department of Pathology, Pennsylvania State University College of Medicine, 500 University Dr., Hershey, PA 17033-2220. Phone: (717) 531-6185. Fax: (717) 531-5634. E-mail: ndc1{at}psu.edu.
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