title: [Establishment of human ovarian cancer cisplatin resistant cell line COC1/DDP and its mechanism of resistance].
abstract: OBJECTIVE
  To establish cisplatin (DDP)-resistant subline of human ovarian cancer and investigate the mechanism responsible for resistance to DDP.
  
  
  METHODS
  A DDP-resistant human ovarian adenocarcinoma cell subline (COC1/DDP) was developed by contineous stepwise selection in increasing concentration of DDP from the parent cell line COC1 in vitro. The multiple changes of biological properties in COC1/DDP cell line were determined.
  
  
  RESULTS
  COC1/DDP cells were of 6.5-fold resistance to DDP and displayed significant cross-resistant with carplatin and mitomycin C, but still remained sensitive to 5-fluorouracil and adriamycin. As compared to the parent cells, in COC1/DDP cells: the doubling time was reduced by 12.9%. Cellular content of DDP was diminished by more one half and the DNA-interstrand cross-links (ISC) was lower than that of the sensitive cells. Evidence of P-glycoprotein overexpression was not shown in COC1 and COC1/DDP cell lines by means of immunohistochemical method.
  
  
  CONCLUSIONS
  The primary factor causing COC1/DDP resistance to DDP is the reduction of intracellular platinum accumulation and DNA ISC formation. The resistance is not considered to be associated with the multidrug resistant and P-glycoprotein.
authors.affiliation: Second Affiliated Hospital, Hubei Medical University, Wuhan.
authors.forename: Y
authors.initials: Y
authors.lastname: Zhou
authors.forename: H
authors.initials: H
authors.lastname: Chen
authors.forename: Q
authors.initials: Q
authors.lastname: Yang
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology*; D002945:Cisplatin; D004249:DNA Damage; D019008:Drug Resistance, Neoplasm; D005260:Female; D006801:Humans; D010051:Ovarian Neoplasms / Q000473:pathology*; D014407:Tumor Cells, Cultured
chemical_list: D002945:Cisplatin