Establishment of a Human Keratinocyte Cell Line Carrying Complete Human Papillomavirus Type 1 Genomes: Lack of Vegetative Viral DNA Synthesis upon Keratinization Free

Abstract

SUMMARY

A human papillomavirus type 1 (HPV-1)/pBR322 recombinant plasmid was constructed consisting of two complete HPV-1 genomes in a head-to-tail arrangement, inserted into the HI site of pBR322. To obtain established human keratinocytes carrying dimeric HPV-1, origin-minus simian virus 40 (SV40) DNA was used as a dominant transforming marker in co-transfection experiments performed with cultured human foetal keratinocytes. Using the Southern blotting technique, HPV-1 DNA was detected in one out of five SV40-transformed human keratinocyte cell lines which were obtained in this way. Further blotting experiments using SV40, pBR322 and HPV-1 DNA as probes revealed patterns of hybridization which were consistent with co-integration of SV40 DNA with between two and four copies of the HPV-1 genome. The HPV-1 sequences in this cell line were virtually non-methylated and were transcribed at a lower level than SV40 mRNAs in the same cultured cells. A low level of monomeric HPV form I DNA was detected by blotting of undigested total cellular DNA. No evidence for a stimulation of form I HPV DNA replication could be obtained by blotting analysis of total DNA extracted from keratinizing cysts, which were formed by subcutaneous inoculation of these cells into nude mice.

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1983-07-01
2024-03-28
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