Hyperphosphorylation of replication protein A in cisplatin-resistant and -sensitive head and neck squamous cell carcinoma cell lines

Karoline C. Manthey, Jason G. Glanzer, Diana D. Dimitrova, Greg G. Oakley

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Background. Resistance to chemotherapy is a major limitation in the treatment of head and neck squamous cell carcinomas (HNSCCs), accounting for high mortality rates in patients. Here, we investigated the role of replication protein A (RPA) in cisplatin and etoposide resistance. Methods. We used 6 parental HNSCC cell lines. We also generated 1 cisplatin-resistant progeny subline from a parental cisplatin-sensitive cell line, to examine cisplatin resistance and sensitivity with respect to RPA2 hyperphosphorylation and cell-cycle response. Results. Cisplatin-resistant HNSCC cell levels of hyperphosphorylated RPA2 in response to cisplatin were 80% to 90% greater compared with cisplatin-sensitive cell lines. RPA2 hyperphosphorylation could be induced in the cisplatin-resistant HNSCC subline. The absence of RPA2 hyperphosphorylation correlated with a defect in cell-cycle progression and cell survival. Conclusion. Loss of RPA2 hyperphosphorylation occurs in HNSCC cells and may be a marker of cellular sensitivities to cisplatin and etoposide in HNSCC.

Original languageEnglish (US)
Pages (from-to)636-645
Number of pages10
JournalHead and Neck
Volume32
Issue number5
DOIs
StatePublished - May 2010

Keywords

  • Cell cycle
  • Cisplatin
  • Etoposide
  • Phosphorylation
  • Replication Protein A (RPA)

ASJC Scopus subject areas

  • Otorhinolaryngology

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