1887

Abstract

Half of the female transgenic mice harbouring human papillomavirus type 16 (HPV-16) E6-E7 genes under control of the mouse mammary tumour virus promoter, developed malignant tumours, including salivary gland carcinomas, lymphomas and skin histiocytomas. Although the E6-E7 genes are aetiological factors for human anogenital carcinoma, the transgenic mice produced no tumours in the anogenital tract. We investigated cytological and histological changes in the anogenital tract of the same transgenic mice. Seventeen (77 %) of 22 transgenic mice developed dysplastic and/or hyperplastic changes in the cervix and vagina. HPV-16 E6-E7 mRNA signals were observed in the genital lesions, while they were not detected in the normal cervices and vaginas of transgenic mice and control mice by RNA hybridization analysis. RNA/PCR analysis using poly(A) RNA showed that only a full- length E6-E7 RNA was expressed in three scraped cell samples from dysplasia, whereas full-length and spliced E6-E7 transcripts were in three cell samples from dysplasia/hyperplasia. These results suggest that expression ofboth E6 and E7 genes of HPV-16 is important for inducing dysplastic and hyperplastic changes in the genital epithelium.

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1994-11-01
2022-08-11
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