Cited by 50DNA Repair MechanismsGenetic factors in colorectal cancerCancer-related Molecular Pathways

The mismatch repair‐mediated cell cycle checkpoint response to fluorodeoxyuridine

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Liu, Angen, Yoshioka, Ken‐ichi, Salerno, Vincenzo, Hsieh, Peggy·2008·Journal of Cellular Biochemistry

Abstract

The loss of DNA mismatch repair (MMR) is responsible for hereditary nonpolyposis colorectal cancer and a subset of sporadic tumors. Acquired resistance or tolerance to some anti‐cancer drugs occurs when MMR function is impaired. 5‐Fluorouracil (FU), an anti‐cancer drug used in the treatment of advanced colorectal and other cancers, and its metabolites are incorporated into RNA and DNA and inhibit thymidylate synthase resulting in depletion of dTTP and incorporation in DNA of uracil. Although the MMR deficiency has been implicated in tolerance to FU, the mechanism of cell killing remains unclear. Here, we examine the cellular response to fluorodeoxyuridine (FdU) and the role of the MMR system. After brief exposure of cells to low doses of FdU, MMR mediates DNA damage signaling during S‐phase and triggers arrest in G2/M in the first cell cycle in a manner requiring MutSα, MutLα, and DNA replication. Cell cycle arrest is mediated by ATR kinase and results in phosphorylation of Chk1 and SMC1. MutSα binds FdU:G mispairs in vitro consistent with its being a DNA damage sensor. Prolonged treatment with FdU results in an irreversible arrest in G2 that is independent of MMR status and leads to the accumulation of DNA lesions that are targeted by the base excision repair (BER) pathway. Thus, MMR can act as a direct sensor of FdU‐mediated DNA lesions eliciting cell cycle arrest via the ATR/Chk1 pathway. However, at higher levels of damage, other damage surveillance pathways such as BER also play important roles. J. Cell. Biochem. 105: 245–254, 2008. © 2008 Wiley‐Liss, Inc.

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Authors
Liu, A., Yoshioka, K., Salerno, V., & Hsieh, P.
Affiliations
National Institutes of Health (US)
Corresponding author
Hsieh, Peggy
Venue
Journal of Cellular Biochemistry
Publisher
Wiley
Published
2008-08-21
Volume
105
Issue
1
Pages
245-254
ISSN
  • 0730-2312 (ISSN-L)
  • 1097-4644
OpenAlex
W2114105734
Cited by
50
References
39
Citations by year
2026: 1 · 2024: 3 · 2023: 1 · 2022: 1 · 2021: 3 · 2020: 2 · 2019: 3 · 2018: 1 · 2017: 1 · 2016: 2 · 2015: 4 · 2014: 4 · 2013: 5 · 2012: 4
FWCI
2.05
Type
journal article
Language
en
Open access
Locations
  • Journal of Cellular Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (Z01DK052029)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Genetic factors in colorectal cancer
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
Keywords
DNA mismatch repair, fluorodeoxyuridine, 5-fluorouracil, cell cycle checkpoints, G2/M cell cycle arrest, ATR kinase, Chk1 phosphorylation, SMC1A, MutSα, MutLα, base excision repair, DNA damage signaling, drug tolerance, colorectal cancer, thymidylate synthase inhibition
MeSH terms
Checkpoint Kinase 1, Cell Cycle, Enzyme Activation, Floxuridine, Humans, Hydroxylamines, Protein Kinases, Signal Transduction, Protein Serine-Threonine Kinases, Cell Cycle Proteins, Cell Line, Tumor, MutS DNA Mismatch-Binding Protein, DNA Mismatch Repair, Ataxia Telangiectasia Mutated Proteins

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