Cited by 107Telomeres, Telomerase, and SenescenceGenomics and Chromatin DynamicsGenetics, Aging, and Longevity in Model Organisms

Function of AP-1 in Transcription of the Telomerase Reverse Transcriptase Gene (TERT) in Human and Mouse Cells

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Takakura, Masahiro, Kyo, Satoru, Inoue, Masaki, Wright, Woodring E., Shay, Jerry W.·2005·Molecular and Cellular Biology

Abstract

The transcriptional regulation of the human telomerase catalytic subunit (hTERT) plays a critical role in telomerase activity. Approximately 200 bp of the proximal core promoter is responsible for basic hTERT expression; however, the function of the distal regulatory elements remains unclear. The transcription factor activator protein 1 (AP-1) is involved in cellular proliferation, differentiation, carcinogenesis, and apoptosis and is expressed broadly in both cancer and normal cells. There are several putative AP-1 sites in the hTERT promoter, but their functions are unknown. The present study examined the regulatory role of AP-1 in hTERT gene transcription. Overexpression of AP-1 leads to transcriptional suppression of hTERT in cancer cells. The combination of c-Fos and c-Jun or c-Fos and JunD strongly suppresses hTERT promoter activity in transient-expression analyses. The hTERT promoter region between -2000 and -378 is responsible for this function. Gel shift and supershift analyses, as well as ChIP, show binding of JunD and c-Jun on two putative AP-1 sites within this region. Mutations in the AP-1 binding sites rescued suppressions caused by AP-1, suggesting this is a direct regulation of the hTERT promoter. In contrast, there was no effect on mTERT expression or mTERT promoter activity by AP-1 overexpression in mouse fibroblasts. The species-specific function of AP-1 in TERT expression may in part help explain the difference in telomerase activity between normal human and mouse cells.

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  1. [20]Kanaya, T., S. Kyo, M. Takakura, H. Ito, M. Namiki, and M. Inoue. 1998. hTERT is a critical determinant of telomerase activity in renal-cell carcinoma. Int. J. Cancer 78:539-543. [DOI] [PubMed] [Google Scholar]
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Authors
Takakura, M., Kyo, S., Inoue, M., Wright, W. E., & Shay, J. W.
Affiliations
  • Kanazawa University (JP)
  • The University of Texas Southwestern Medical Center (US)
Corresponding author
Shay, Jerry W.
Venue
Molecular and Cellular Biology
Published
2005-09-01
Volume
25
Issue
18
Pages
8037-8043
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2114840351
Cited by
107
References
47
Citations by year
2025: 2 · 2024: 2 · 2023: 2 · 2021: 5 · 2020: 1 · 2019: 4 · 2018: 6 · 2017: 6 · 2016: 5 · 2015: 6 · 2014: 7 · 2013: 7 · 2012: 7
FWCI
4.20
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Aging (AG07992, R01AG007992)
  • National Cancer Institute (CA 70907, R01CA085363, P50CA070907, CA 85363)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
Keywords
activator protein-1, telomerase reverse transcriptase, c-fos, c-Jun, JunD, AP-1 binding site, telomerase regulation, species-specific gene regulation, cancer cells, transcriptional repression
MeSH terms
Animals, Base Sequence, Binding Sites, DNA-Binding Proteins, HeLa Cells, Humans, Molecular Sequence Data, Mutation, Promoter Regions, Genetic, Transcription, Genetic, Transcriptional Activation, Gene Expression Regulation, Enzymologic, Proto-Oncogene Proteins c-jun, Proto-Oncogene Proteins c-fos, Transcription Factor AP-1, Telomerase, NIH 3T3 Cells, Mice

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