Regulation of the human AP-endonuclease (APE1/Ref-1) expression by the tumor suppressor p53 in response to DNA damage
Open accessAbstract
The human AP-endonuclease (APE1/Ref-1), an essential multifunctional protein, plays a central role in the repair of oxidative base damage via the DNA base excision repair (BER) pathway. The mammalian AP-endonuclease (APE1) overexpression is often observed in tumor cells, and confers resistance to various anticancer drugs; its downregulation sensitizes tumor cells to those agents via induction of apoptosis. Here we show that wild type (WT) but not mutant p53 negatively regulates APE1 expression. Time-dependent decrease was observed in APE1 mRNA and protein levels in the human colorectal cancer line HCT116 p53(+/+), but not in the isogenic p53 null mutant after treatment with camptothecin, a DNA topoisomerase I inhibitor. Furthermore, ectopic expression of WTp53 in the p53 null cells significantly reduced both endogenous APE1 and APE1 promoter-dependent luciferase expression in a dose-dependent fashion. Chromatin immunoprecipitation assays revealed that endogenous p53 is bound to the APE1 promoter region that includes a Sp1 site. We show here that WTp53 interferes with Sp1 binding to the APE1 promoter, which provides a mechanism for the downregulation of APE1. Taken together, our results demonstrate that WTp53 is a negative regulator of APE1 expression, so that repression of APE1 by p53 could provide an additional pathway for p53-dependent induction of apoptosis in response to DNA damage.
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After DNA damage, p53 can negatively regulate APE1 and MGMT by sequestering the Sp1 transcription factor needed for promoter activation.
“Following DNA damage, p53 can act as a negative regulator of APE150 and MGMT5 by sequestering the Sp1 transcription factor required for promoter activation.”
From Combination therapy in a xenograft model of glioblastoma: Enhancement of the antitumor activity of temozolomide by an MDM2 antagonist (2017) · cites this paper as [50]
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- Authors
- Zaky, A., Busso, C., Izumi, T., Chattopadhyay, R., Bassiouny, A., Mitra, S., & Bhakat, K. K.
- Affiliations
- The University of Texas Medical Branch at Galveston (US)
- Louisiana State University (US)
- Corresponding author
- Bhakat, K. K.
- Venue
- Nucleic Acids Research
- Publisher
- Oxford University Press (OUP)
- Published
- 2008-01-10
- Volume
- 36
- Issue
- 5
- Pages
- 1555-1566
- ISSN
- 0305-1048 (ISSN-L)
- 1362-4962
- PMC
- PMC2275136
- OpenAlex
- W2106130941
- Cited by
- 111
- References
- 65
- Citations by year
- 2026: 1 · 2025: 8 · 2024: 3 · 2023: 1 · 2022: 1 · 2021: 4 · 2020: 7 · 2019: 4 · 2018: 4 · 2017: 6 · 2016: 10 · 2015: 4 · 2014: 5 · 2013: 14 · 2012: 5
- FWCI
- 5.99
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by-nc
- Locations
- Nucleic Acids Research (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Funders
- American Heart Association
- University of Oxford
- National Institutes of Health
- National Cancer Institute (CA98664, R01 CA53791, R56CA098664, R01CA053791, R01CA098664)
- National Institute of Environmental Health Sciences (R01 ES 08457, R01ES008457)
- Topics
- Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Keywords
- APE1/Ref-1, p53, transcriptional regulation, Sp1, DNA base excision repair, oxidative DNA damage, DNA damage response, apoptosis, camptothecin, colorectal cancer, chemoresistance
- MeSH terms
- DNA Damage, Humans, Mutation, Promoter Regions, Genetic, RNA, Messenger, Down-Regulation, Gene Expression Regulation, Enzymologic, Tumor Suppressor Protein p53, Sp1 Transcription Factor, Response Elements, DNA-(Apurinic or Apyrimidinic Site) Lyase, Cell Line, Tumor
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