Establishment and characterization of cisplatin-resistant human epidermoid carcinoma cell line, A431 cell

Hiroshi Mese, Akira Sasaki, Rafael E. Alcalde, Shuko Nakayama, Tomohiro Matsumura

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Cisplatin, cis-diamminedichloroplatinum(II) (CDDP) is one of the most important anticancer agents, initially producing good responses in various tumors. However, resistance to this drug often develops in various tumors, and additional administration decreases its chemotherapeutic efficacy. The precise mechanism of acquisition of resistance to this drug is still uncertain. However in the present study, we established two CDDP-resistant sublines A431/CDDP1 and A431/CDDP2 from human epidermoid carcinoma cell line A431. These resistant sublines were constituted by exposing A431 cells to a gradually increasing dose of CDDP (A431/CDDP1), and by mutagenic induction with mutagen (A431/CDDP2). A431/CDDP1 and A431/CDDP2 have developed 3.1 and 2.7 times more resistance to CDDP than the original A431 cell in terms of IC50. The two CDDP-resistant sublines showed cross-resistance to the CDDP analogue, carboplatin (CBDCA), but not to other chemotherapeutic drugs such as Adriamycin (ADR) and 5-fluorouracil (5-FU). These CDDP-resistant sublines were transplanted into nude mice to demonstrate the resistance to CDDP treatment in vivo. According to the in vitro assay, the mechanism of resistance in A431/CDDP1 and A431/CDDP2 seems to be based on a reduction of intracellular accumulation of CDDP, because their platinum concentration, which is the major component of CDDP, significantly declined. The established CDDP-resistant sublines may be used in further trials to improve the understanding of the mechanisms of resistance to CDDP.

Original languageEnglish
Pages (from-to)414-420
Number of pages7
JournalCHEMOTHERAPY
Volume44
Issue number6
DOIs
Publication statusPublished - Nov 1 1998

    Fingerprint

Keywords

  • A431
  • Cisplatin resistance
  • Nude mice
  • Oral cancer

ASJC Scopus subject areas

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

Cite this