DNA repair proteins and telomerase reverse transcriptase in the cochlear lateral wall of cisplatin-treated rats

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12 Scopus citations

Abstract

Cochlear lateral wall damage is a side effect of cisplatm chemotherapy. Recent studies have shown that cisplatin treatment precipitates platinated DNA adducts in the cocblear lateral wall which suggest that DNA damage may contribute to ototoxicity. Platinated adducts are high-affinity substrates for the global genomic nucleotide excision repair (GG-NER) pathway which is facilitated by xeroderma pigmentosum (XP) complementing proteins, such as XPC, XPD and XPA. Tumor biology has shown that in addition to stimulating GG-NER, cisplatin may deplete telomerase reverse transcriptase (TERT). In the current study Fischer344 rats were treated with cisplatin (2 mg/kg/4 days, i.p.) and their cochleae harvested for immunohistochemistry. XPC, XPD and XPA expression increased while TERT expression decreased among cisplatin treated animals compared to vehicle control. These findings suggest that in addition to forming platinated adducts, cisplatin chemotherapy may up-regulate DNA repair proteins and modify TERT expression in the cochlear lateral wall.

Original languageEnglish (US)
Pages (from-to)74-79
Number of pages6
JournalJournal of Chemotherapy
Volume21
Issue number1
DOIs
StatePublished - 2009
Externally publishedYes

Keywords

  • Cisplatin
  • Cochlear lateral wall
  • Nucleotide excision repair
  • Telomerase reverse transcriptase
  • Xeroderma pigmentosum

ASJC Scopus subject areas

  • Oncology
  • Pharmacology
  • Pharmacology (medical)
  • Infectious Diseases

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