Human telomerase reverse transcriptase activated by E6 oncoprotein is required for human papillomavirus-16/18-infected lung tumorigenesis

Ya Wen Cheng, Tzu Chin Wu, Chih Yi Chen, Ming Chih Chou, Jiunn Liang Ko, Huei Lee

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Purpose: Our recent report indicates that human papillomavirus (HPV)-16/18 E6 oncoprotein is expressed in lung tumors and is related to p53 inactivation. We further explored whether human telomerase reverse transcriptase (hTERT) transcription is up-regulated by E6 and contributes to lung tumor development. Experimental Design: Immunohistochemistry detected HPV-16 E6 oncoprotein in 135 lung tumors, and hTERT mRNA was evaluated by real-time reverse transcription-PCR and in situ hybridization, respectively. A small RNA interference (RNAi), Western blotting, and chromatin immunoprecipitation analysis were used to clarify whether hTERT transcription was regulated by c-Myc and Sp1. The telomerase activity and oncogenic potential of TL-1 with or without E6- or hTERT-RNAi was determined by real-time quantitative telomeric repeat amplification protocol analysis and soft-agar assay, respectively. Results: hTERT mRNA levels in E6-positive tumors, which were prevalent in females, nonsmokers, and adenocarcinomas, were significantly higher than in E6-negative tumors. In addition, hTERT mRNA levels in early tumors (stage I) were greater than levels in advanced tumors (stages II and III). Chromatin immunoprecipitation assay showed that Sp1 cooperated with c-Myc to activate hTERT transcription in TL-1 cells, which was similar to the SiHa cells. The telomerase activity of the TL-1 cells decreased concomitantly with the transfection of various doses of E6- or hTERT-RNAi. A soft-agar assay showed that the oncogenic potential of TL-1 cells was significantly reduced after being transfected with E6-RNAi. Moreover, a colony of TL-1 cells could not form after transfection with hTERT-RNAi. Conclusion: Transcriptional activation of hTERT by E6 oncoprotein is required for HPV-16/18-infected lung tumorigenesis.

Original languageEnglish
Pages (from-to)7173-7179
Number of pages7
JournalClinical Cancer Research
Volume14
Issue number22
DOIs
Publication statusPublished - Nov 15 2008
Externally publishedYes

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Human papillomavirus 18
Human papillomavirus 16
Oncogene Proteins
Carcinogenesis
Lung
RNA Interference
Reverse Transcription
Neoplasms
Chromatin Immunoprecipitation
Telomerase
Messenger RNA
Agar
Transfection
human TERT protein
Transcriptional Activation
In Situ Hybridization
Adenocarcinoma
Research Design
Western Blotting
Immunohistochemistry

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Human telomerase reverse transcriptase activated by E6 oncoprotein is required for human papillomavirus-16/18-infected lung tumorigenesis. / Cheng, Ya Wen; Wu, Tzu Chin; Chen, Chih Yi; Chou, Ming Chih; Ko, Jiunn Liang; Lee, Huei.

In: Clinical Cancer Research, Vol. 14, No. 22, 15.11.2008, p. 7173-7179.

Research output: Contribution to journalArticle

Cheng, Ya Wen ; Wu, Tzu Chin ; Chen, Chih Yi ; Chou, Ming Chih ; Ko, Jiunn Liang ; Lee, Huei. / Human telomerase reverse transcriptase activated by E6 oncoprotein is required for human papillomavirus-16/18-infected lung tumorigenesis. In: Clinical Cancer Research. 2008 ; Vol. 14, No. 22. pp. 7173-7179.
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AU - Cheng, Ya Wen

AU - Wu, Tzu Chin

AU - Chen, Chih Yi

AU - Chou, Ming Chih

AU - Ko, Jiunn Liang

AU - Lee, Huei

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AB - Purpose: Our recent report indicates that human papillomavirus (HPV)-16/18 E6 oncoprotein is expressed in lung tumors and is related to p53 inactivation. We further explored whether human telomerase reverse transcriptase (hTERT) transcription is up-regulated by E6 and contributes to lung tumor development. Experimental Design: Immunohistochemistry detected HPV-16 E6 oncoprotein in 135 lung tumors, and hTERT mRNA was evaluated by real-time reverse transcription-PCR and in situ hybridization, respectively. A small RNA interference (RNAi), Western blotting, and chromatin immunoprecipitation analysis were used to clarify whether hTERT transcription was regulated by c-Myc and Sp1. The telomerase activity and oncogenic potential of TL-1 with or without E6- or hTERT-RNAi was determined by real-time quantitative telomeric repeat amplification protocol analysis and soft-agar assay, respectively. Results: hTERT mRNA levels in E6-positive tumors, which were prevalent in females, nonsmokers, and adenocarcinomas, were significantly higher than in E6-negative tumors. In addition, hTERT mRNA levels in early tumors (stage I) were greater than levels in advanced tumors (stages II and III). Chromatin immunoprecipitation assay showed that Sp1 cooperated with c-Myc to activate hTERT transcription in TL-1 cells, which was similar to the SiHa cells. The telomerase activity of the TL-1 cells decreased concomitantly with the transfection of various doses of E6- or hTERT-RNAi. A soft-agar assay showed that the oncogenic potential of TL-1 cells was significantly reduced after being transfected with E6-RNAi. Moreover, a colony of TL-1 cells could not form after transfection with hTERT-RNAi. Conclusion: Transcriptional activation of hTERT by E6 oncoprotein is required for HPV-16/18-infected lung tumorigenesis.

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