Brunel University Research Archive (BURA) >
College of Health and Life Sciences >
Dept of Clinical Sciences >
Dept of Clinical Sciences Research Papers >

Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/3180

Title: Telomerase suppression by chromosome 6 in a human papillomavirus type 16-immortalized keratinocyte cell line and in a cervical cancer cell line
Authors: Steenbergen, RD
Kramer, D
Meijer, CJ
Walboomers, JM
Trott, DA
Cuthbert, AP
Newbold, RF
Overkamp, WJ
Zdzienicka, MZ
Snijders, PJ
Keywords: Cell Division
Cell Line, Transformed
Chromosomes, Human, Pair 11
Chromosomes, Human, Pair 6
DNA-Binding Proteins
Female
Genes, Reporter
Humans
Hybrid Cells
Keratinocytes
Publication Date: 2001
Publisher: Oxford University Press
Citation: Journal of the National Cancer Institute. 93 (11) 865-872
Abstract: BACKGROUND: High-risk human papillomavirus (HPV) types play a major role in the development of cervical cancer in vivo and can induce immortalization of primary human keratinocytes in vitro. Activation of the telomere-lengthening enzyme telomerase constitutes a key event in both processes. Because losses of alleles from chromosome 6 and increased telomerase activity have been observed in high-grade premalignant cervical lesions, we analyzed whether human chromosome 6 harbors a putative telomerase repressor locus that may be involved in HPV-mediated immortalization. METHODS: Microcell-mediated chromosome transfer was used to introduce chromosomes 6 and 11 to the in vitro generated HPV type 16 (HPV16)-immortalized keratinocyte cell line FK16A and to the in vivo derived HPV16-containing cervical cancer cell line SIHA: Hybrid clones were analyzed for growth characteristics, telomerase activity, human telomerase reverse transcriptase (hTERT) and HPV16 E6 expression, and telomere length. FK16A hybrid clones were also transduced with an hTERT-containing retrovirus to examine the effect of ectopic hTERT expression on growth. Statistical tests were two-sided. RESULTS: Introduction of human chromosome 6 but not of chromosome 11 to both cell lines yielded hybrid cells that demonstrated crisis-like features (i.e., enlarged and flattened morphology, vacuolation, and multinucleation) and underwent growth arrest after a marked lag period. In the chromosome 6 hybrid clones analyzed, telomerase activity and hTERT messenger RNA (mRNA) expression were statistically significantly reduced compared with those in the chromosome 11 hybrid clones (for telomerase activity, P =.004 for the FK16A hybrids and P =.039 for the SiHa hybrids; for hTERT mRNA expression, P =.003 for the FK16A hybrids). The observed growth arrest was associated with telomeric shortening. Ectopic expression of hTERT in FK16A cells could prevent the telomeric shortening-based growth arrest induced by chromosome 6. CONCLUSIONS: Chromosome 6 may harbor a repressor of hTERT transcription, the loss of which may be involved in HPV-mediated immortalization.
URI: http://bura.brunel.ac.uk/handle/2438/3180
ISSN: 0027-8874
Appears in Collections:Community Health and Public Health
Dept of Clinical Sciences Research Papers

Files in This Item:

File Description SizeFormat
Embargoed Paper.txt204 BTextView/Open

Items in BURA are protected by copyright, with all rights reserved, unless otherwise indicated.