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J Virol. 1990 July; 64(7): 3310-3318

Infectious cycle of human papillomavirus type 11 in human foreskin xenografts in nude mice.

M H Stoler, A Whitbeck, S M Wolinsky, T R Broker, L T Chow, M K Howett and J W Kreider

Department of Pathology and Laboratory Medicine, University of Rochester School of Medicine, New York 14642.

ABSTRACT

We have performed the first molecular analysis of a time course of infection by a papillomavirus. The Hershey isolate of the human papillomavirus type 11 was used to infect human foreskin tissues, which were then implanted under the renal capsules of nude mice. The xenografts were recovered every 2 weeks for 14 weeks, fixed in formalin, and embedded in paraffin. Four-micrometer serial sections were examined by light microscopy for morphological changes, by immunocytochemistry for virion antigen production, and by in situ hybridization with 3H-labeled RNA probes for viral DNA replication and expression of the major mRNA species. After a lag period, probes spanning the E4 and E5 open reading frames, which are present in all E region viral mRNAs, generated the first detectable signals at week 4. Signals of other E region probes were minimally detected at week 6. Between weeks 6 and 8, there was an abrupt change in the implant such that cellular proliferation, viral DNA replication, and E and L region mRNA transcription were robust and reached a plateau. By weeks 10 to 12, the experimental condylomata were morphologically and histologically indistinguishable from naturally occurring condylomata acuminata. These findings suggest that cellular hyperproliferation and the morphologic features of condylomata are direct results of viral genetic activities. Unlike other DNA viruses, the E region transcripts increased with cell age and cellular differentiation and persisted throughout the entire experiment. In particular, the mRNA encoding the E1iE4 and perhaps E5 proteins remained overwhelmingly abundant. In contrast, viral DNA replication, L region mRNA synthesis, and virion antigen production were restricted to the most differentiated, superficial cells.

J Virol. 1990 July; 64(7): 3310-3318




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