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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Characterization of global transcription profile of normal and HPV-immortalized keratinocytes and their response to TNF treatment

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Termini, Lara [1, 2] ; Boccardo, Enrique [1] ; Esteves, Gustavo H. [3] ; Hirata, Jr., Roberto [3] ; Martins, Waleska K. [1, 2] ; Colo, Anna Estela L. [1, 2] ; Neves, E. Jordao [3] ; Villa, Luisa Lina [1] ; Reis, Luiz F. L. [1, 2]
Total Authors: 9
[1] Ludwig Inst Canc Res, Sao Paulo - Brazil
[2] Hosp Canc AC Camargo, Sao Paulo - Brazil
[3] Univ Sao Paulo, Inst Matemat & Estatist, Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: BMC MEDICAL GENOMICS; v. 1, JUN 27 2008.
Web of Science Citations: 15

Background: Persistent infection by high risk HPV types (e.g. HPV-16, -18, -31, and -45) is the main risk factor for development of cervical intraepithelial neoplasia and cervical cancer. Tumor necrosis factor (TNF) is a key mediator of epithelial cell inflammatory response and exerts a potent cytostatic effect on normal or HPV16, but not on HPV18 immortalized keratinocytes. Moreover, several cervical carcinoma-derived cell lines are resistant to TNF anti-proliferative effect suggesting that the acquisition of TNF-resistance may constitute an important step in HPV-mediated carcinogenesis. In the present study, we compared the gene expression profiles of normal and HPV16 or 18 immortalized human keratinocytes before and after treatment with TNF for 3 or 60 hours. Methods: In this study, we determined the transcriptional changes 3 and 60 hours after TNF treatment of normal, HPV16 and HPV18 immortalized keratinocytes by microarray analysis. The expression pattern of two genes observed by microarray was confirmed by Northern Blot. NF-kappa B activation was also determined by electrophoretic mobility shift assay (EMSA) using specific oligonucleotides and nuclear protein extracts. Results: We observed the differential expression of a common set of genes in two TNF-sensitive cell lines that differs from those modulated in TNF-resistant ones. This information was used to define genes whose differential expression could be associated with the differential response to TNF, such as: KLK7 (kallikrein 7), SOD2 (superoxide dismutase 2), 100P (S100 calcium binding protein P), PI3 (protease inhibitor 3, skin-derived), CSTA (cystatin A), RARRES1 (retinoic acid receptor responder 1), and LXN (latexin). The differential expression of the KLK7 and SOD2 transcripts was confirmed by Northern blot. Moreover, we observed that SOD2 expression correlates with the differential NF-kappa B activation exhibited by TNF-sensitive and TNF-resistant cells. Conclusion: This is the first in depth analysis of the differential effect of TNF on normal and HPV16 or HPV18 immortalized keratinocytes. Our findings may be useful for the identification of genes involved in TNF resistance acquisition and candidate genes which deregulated expression may be associated with cervical disease establishment and/or progression. (AU)

FAPESP's process: 98/14335-2 - Antonio Prudente Cancer Research Center
Grantee:Fernando Augusto Soares
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC