title: Characterization of keratin and cell cycle protein expression in cell lines from squamous intraepithelial lesions progressing towards a malignant phenotype.
abstract: Two cell lines derived from vaginal intraepithelial neoplasias (VAINs) expressing human papillomavirus (HPV) 33 (VAIN I, UT-DEC-1) and 16 (VAIN II, UT-DEC-2) E6-E7 mRNA were studied in organotypic culture for their keratins and cell cycle regulatory proteins in relation to replicative aging. Early-passage UT-DEC-1 and UT-DEC-2 cells reproduced epithelial patterns consistent with VAIN. Cells from later passages resembled full-thickness intraepithelial neoplasia (UT-DEC-1) and microinvasive cancer (UT-DEC-2). The morphological changes were compatible with these cell lines' ability for anchorage-independent growth at later passages. Simple epithelial keratins were aberrantly expressed in both cell lines. K18 (absent in normal vaginal keratinocytes) and K17 expression increased in UT-DEC-1 and UT-DEC-2 cells at late passages. No marked differences in expression of p53 (wild type in both cell lines), mdm-2 or PCNA were detected in parallel with progression. The expression of p21WAF1/cip1 localized mostly to the upper half of the epithelium at early passage and was more intense in the HPV 16-positive UT-DEC-2 cell line expressing K10. In Northern blot analyses, the transcription pattern of the HPV 33 E6-E7 of the UT-DEC-1 cell line changed during later passages, whereas that of the HPV 16 E6-E7 of the UT-DEC-2 cell line remained unaltered. The present characterization of the phenotype of these cell lines derived from natural squamous intraepithelial lesions shows an association between simple epithelial-type keratin expression and progressive changes in growth and morphology, but fails to demonstrate consistent changes in the expression of cell cycle regulatory proteins studied in parallel with progression.
authors.affiliation: Department of Obstetrics and Gynecology, Turku University Hospital, Finland.
authors.forename: S
authors.initials: S
authors.lastname: Hietanen
authors.forename: K
authors.initials: K
authors.lastname: Syrjänen
authors.forename: S
authors.initials: S
authors.lastname: Syrjänen
mesh_terms: D002278:Carcinoma in Situ / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D002294:Carcinoma, Squamous Cell / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D002448:Cell Adhesion; D018929:Cell Culture Techniques; D018797:Cell Cycle Proteins / Q000096:biosynthesis* / Q000235:genetics; D016922:Cellular Senescence; D018450:Disease Progression; D004847:Epithelial Cells / Q000378:metabolism; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D016147:Genes, Tumor Suppressor; D006801:Humans; D007633:Keratins / Q000096:biosynthesis* / Q000235:genetics; D009363:Neoplasm Proteins / Q000096:biosynthesis* / Q000235:genetics; D027383:Papillomaviridae; D030361:Papillomavirus Infections / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D010641:Phenotype; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D012333:RNA, Messenger / Q000032:analysis; D012334:RNA, Neoplasm / Q000032:analysis; D014407:Tumor Cells, Cultured; D014412:Tumor Virus Infections / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D014621:Vagina / Q000378:metabolism* / Q000473:pathology
chemical_list: D018797:Cell Cycle Proteins; D009363:Neoplasm Proteins; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D007633:Keratins