APE1, the DNA base excision repair protein, regulates the removal of platinum adducts in sensory neuronal cultures by NER

Hyun Suk Kim, Chunlu Guo, Eric L. Thompson, Yanlin Jiang, Mark Kelley, Michael Vasko, Suk-Hee Lee

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Peripheral neuropathy is one of the major side effects of treatment with the anticancer drug, cisplatin. One proposed mechanism for this neurotoxicity is the formation of platinum adducts in sensory neurons that could contribute to DNA damage. Although this damage is largely repaired by nuclear excision repair (NER), our previous findings suggest that augmenting the base excision repair pathway (BER) by overexpressing the repair protein APE1 protects sensory neurons from cisplatin-induced neurotoxicity. The question remains whether APE1 contributes to the ability of the NER pathway to repair platinum-damage in neuronal cells. To examine this, we manipulated APE1 expression in sensory neuronal cultures and measured Pt-removal after exposure to cisplatin. When neuronal cultures were treated with increasing concentrations of cisplatin for two or three hours, there was a concentration-dependent increase in Pt-damage that peaked at four hours and returned to near baseline levels after 24. h. In cultures where APE1 expression was reduced by ~80% using siRNA directed at APE1, there was a significant inhibition of Pt-removal over eight hours which was reversed by overexpressing APE1 using a lentiviral construct for human wtAPE1. Overexpressing a mutant APE1 (C65 APE1), which only has DNA repair activity, but not its other significant redox-signaling function, mimicked the effects of wtAPE1. Overexpressing DNA repair activity mutant APE1 (226. +. 177APE1), with only redox activity was ineffective suggesting it is the DNA repair function of APE1 and not its redox-signaling, that restores the Pt-damage removal. Together, these data provide the first evidence that a critical BER enzyme, APE1, helps regulate the NER pathway in the repair of cisplatin damage in sensory neurons.

Original languageEnglish
Pages (from-to)96-104
Number of pages9
JournalMutation Research - Fundamental and Molecular Mechanisms of Mutagenesis
Volume779
DOIs
StatePublished - Sep 1 2015

Fingerprint

Platinum
DNA Repair
Cisplatin
DNA
Proteins
Sensory Receptor Cells
Oxidation-Reduction
Peripheral Nervous System Diseases
Small Interfering RNA
DNA Damage
Enzymes
Pharmaceutical Preparations

Keywords

  • APE1
  • Base excision repair
  • Cisplatin damage
  • Nucleotide excision repair
  • Replication protein A
  • Sensory neuronal cultures

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Health, Toxicology and Mutagenesis

Cite this

APE1, the DNA base excision repair protein, regulates the removal of platinum adducts in sensory neuronal cultures by NER. / Kim, Hyun Suk; Guo, Chunlu; Thompson, Eric L.; Jiang, Yanlin; Kelley, Mark; Vasko, Michael; Lee, Suk-Hee.

In: Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis, Vol. 779, 01.09.2015, p. 96-104.

Research output: Contribution to journalArticle

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abstract = "Peripheral neuropathy is one of the major side effects of treatment with the anticancer drug, cisplatin. One proposed mechanism for this neurotoxicity is the formation of platinum adducts in sensory neurons that could contribute to DNA damage. Although this damage is largely repaired by nuclear excision repair (NER), our previous findings suggest that augmenting the base excision repair pathway (BER) by overexpressing the repair protein APE1 protects sensory neurons from cisplatin-induced neurotoxicity. The question remains whether APE1 contributes to the ability of the NER pathway to repair platinum-damage in neuronal cells. To examine this, we manipulated APE1 expression in sensory neuronal cultures and measured Pt-removal after exposure to cisplatin. When neuronal cultures were treated with increasing concentrations of cisplatin for two or three hours, there was a concentration-dependent increase in Pt-damage that peaked at four hours and returned to near baseline levels after 24. h. In cultures where APE1 expression was reduced by ~80{\%} using siRNA directed at APE1, there was a significant inhibition of Pt-removal over eight hours which was reversed by overexpressing APE1 using a lentiviral construct for human wtAPE1. Overexpressing a mutant APE1 (C65 APE1), which only has DNA repair activity, but not its other significant redox-signaling function, mimicked the effects of wtAPE1. Overexpressing DNA repair activity mutant APE1 (226. +. 177APE1), with only redox activity was ineffective suggesting it is the DNA repair function of APE1 and not its redox-signaling, that restores the Pt-damage removal. Together, these data provide the first evidence that a critical BER enzyme, APE1, helps regulate the NER pathway in the repair of cisplatin damage in sensory neurons.",
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