Cited by 76Cancer therapeutics and mechanismsCytokine Signaling Pathways and InteractionsDNA Repair Mechanisms

The cdk5 kinase regulates the STAT3 transcription factor to prevent DNA damage upon topoisomerase I inhibition

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Courapied, Sandy, Sellier, Hélène, de Carné Trécesson, Sophie, Vigneron, Arnaud, Bernard, Anne-Charlotte, Gamelin, Erick, Barré, Benjamin, Coqueret, Olivier·2010·Journal of Biological Chemistry

Abstract

The STAT3 transcription factors are cytoplasmic proteins that induce gene activation in response to growth factor stimulation. Following tyrosine phosphorylation, STAT3 proteins dimerize, translocate to the nucleus, and activate specific target genes involved in cell-cycle progression. Despite its importance in cancer cells, the molecular mechanisms by which this protein is regulated in response to DNA damage remain to be characterized. In this study, we show that STAT3 is activated in response to topoisomerase I inhibition. Following treatment, STAT3 is phosphorylated on its C-terminal serine 727 residue but not on its tyrosine 705 site. We also show that topoisomerase I inhibition induced the up-regulation of the cdk5 kinase, a protein initially described in neuronal stress responses. In co-immunoprecipitations, cdk5 was found to associate with STAT3, and pulldown experiments indicated that it associates with the C-terminal activation domain of STAT3 upon DNA damage. Importantly, the cdk5-STAT3 pathway reduced DNA damage in response to topoisomerase I inhibition through the up-regulation of Eme1, an endonuclease involved in DNA repair. ChIP experiments indicated that STAT3 can be found associated with the Eme1 promoter when phosphorylated only on its serine 727 residue and not on tyrosine 705. We therefore propose that the cdk5-STAT3 oncogenic pathway plays an important role in the expression of DNA repair genes and that these proteins could be used as predictive markers of…

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Crossref · 10.1074/jbc.m109.092304

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Authors
Courapied, S., Sellier, H., de Carné Trécesson, S., Vigneron, A., Bernard, A.-C., Gamelin, E., Barré, B., & Coqueret, O.
Affiliations
Inserm (FR)
Corresponding author
Coqueret, Olivier
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2010-08
Volume
285
Issue
35
Pages
26765-26778
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2004095560
Cited by
76
References
60
Citations by year
2025: 7 · 2024: 2 · 2023: 3 · 2022: 2 · 2021: 1 · 2020: 8 · 2019: 5 · 2018: 4 · 2017: 10 · 2016: 7 · 2015: 6 · 2014: 6 · 2013: 5 · 2012: 4
FWCI
1.95
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cancer therapeutics and mechanisms
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
topoisomerase I inhibition, DNA damage, serine 727 phosphorylation, tyrosine 705 phosphorylation, DNA repair, chemoresistance, predictive biomarkers, oncogenic signaling
MeSH terms
DNA Damage, DNA Topoisomerases, Type I, Endodeoxyribonucleases, Enzyme Inhibitors, Humans, Neoplasm Proteins, Neoplasms, Phosphorylation, Promoter Regions, Genetic, Biomarkers, Tumor, Gene Expression Regulation, Neoplastic, Protein Structure, Tertiary, Cell Line, Tumor, STAT3 Transcription Factor, Cyclin-Dependent Kinase 5, Protein Multimerization, Topoisomerase I Inhibitors

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