Journal Article

Chromosomal abnormalities in HPV-16-immortalized oral epithelial cells

Dolphine Oda, Lenora Bigler, Er-Jia Mao and Christine M. Disteche

in Carcinogenesis

Volume 17, issue 9, pages 2003-2008
Published in print September 1996 | ISSN: 0143-3334
Published online September 1996 | e-ISSN: 1460-2180 | DOI:
Chromosomal abnormalities in HPV-16-immortalized oral epithelial

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Human papilloma virus (HPV) type 16 has an established association with anogenital carcinoma, and to some extent with human oral squamous cell carcinoma. We hypothesize that HPV type 16 is capable of inducing chromosomal and cell cycle changes in cultured oral epithelial cells. Normal human oral epithelial cells were immortalized with recom-binant retrovirus containing the E6/E7 open reading frames of HPV type 16. These cells have been in culture for more than 350 passages and over 4 years. Flow cytometry demonstrated an average of 42% nuclear aneuploidy in HPV 16-immortalized cells; 16% in normal controls (probably tetrasomy). Cytogenetic analysis demonstrated significant progression of chromosomal abnormalities. Cells at early passage (p10) showed trisomy 20, with no other major changes. At passage 18, trisomy lq and monosomy 13 were seen in addition to trisomy 20. At passage 61 there were two distinct cell populations (‘a’ and ‘b’), with multiple chromosomal changes including trisomy 5q,14,20 in one line and 7p,9q,11q in the other. Both populations had monosomy 3p, with monosomy 8p in one population and monosomy 13 in the other. At passage 136, the cells were essentially identical to population ‘b’ of passage 61. At this passage, mutation of the p53 gene was detected at codon 273 of exon 8, with G to T conversion (Arg to Leu). This was absent in the normal cells from which this line was developed. Passage 262 contained the two major cell populations, each with a sub-group with additional chromosomal changes such as l0p monosomy. Cells from passages 217 and 305 were injected into nude mice a year apart Both failed to produce tumors, as did normal cells. In conclusion, we present an HPV type 16-immortalized oral epithelial cell line (IHGK) with extensive and progressive chromosomal abnormalities, invasive growth in culture and yet no tumor formation in nude mice. We suggest that the question as to whether HPV alone can induce transformation is still open.

Journal Article.  0 words. 

Subjects: Clinical Cytogenetics and Molecular Genetics

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