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J Virol, June 1998, p. 5016-5024, Vol. 72, No. 6
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Activation of Papillomavirus Late Gene Transcription and Genome Amplification upon Differentiation in Semisolid Medium Is Coincident with Expression of Involucrin and Transglutaminase but Not Keratin-10

Margaret N. Ruesch, Frank Stubenrauch,dagger and Laimonis A. Laimins*

Department of Microbiology-Immunology, Northwestern University Medical School, Chicago, Illinois 60611

Received 21 January 1998/Accepted 5 March 1998

The life cycle of the papillomaviruses is closely linked to host cell differentiation, as demonstrated by the fact that amplification of viral DNA and transcription of late genes occur only in the suprabasal cells of a differentiated epithelium. Previous studies examining the pathogenesis of papillomavirus infections have relied on the use of organotypic raft cultures or lesions from patients to examine these differentiation-dependent viral activities. In this study, we used a simple system for epithelial differentiation to study human papillomavirus (HPV) late functions. We demonstrate that the suspension of HPV-infected keratinocytes in semisolid medium containing 1.6% methylcellulose for 24 h was sufficient for the activation of the late promoter, transcription of late genes, and amplification of viral DNA. These activities were shown to be linked to and coincide with cellular differentiation. Expression of the late protein E1and E4 and amplification of viral DNA were detected in the identical set of cells after suspension in methylcellulose. This technique was also used to analyze the differentiation properties of the cells which expressed the late protein E1and E4. While induction of the spinous layer markers involucrin and transglutaminase was compatible with late promoter induction, expression of the differentiation-specific keratin-10 was shown not to be required for HPV late functions. Interestingly, while the majority of normal human keratinocytes induced filaggrin expression by 24 h, this marker of the granular layer was induced in a smaller subset of HPV type 31 (HPV-31)-positive cells at this time point. The HPV-31-positive cells which expressed filaggrin did not induce the late protein E1and E4. Use of the methylcellulose system to induce epithelial differentiation coupled with the ability to perform a genetic analysis of HPV functions by using transfection of cloned viral DNA will facilitate the study of the regulation of the papillomavirus life cycle.

* Corresponding author. Mailing address: Department of Microbiology-Immunology, Northwestern University Medical School, 303 E. Chicago Ave., Chicago, IL 60611. Phone: (312) 503-0648. Fax: (312) 503-1339. E-mail: lal{at}merle.acns.nwu.edu.

dagger Present address: Universität Tübingen, Tübingen, Germany.

J Virol, June 1998, p. 5016-5024, Vol. 72, No. 6
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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