Mechanisms of cisplatin resistance in clear cell carcinoma of the ovary.
Resistance of clear cell carcinoma (CCC) of the ovary to platinum-based chemotherapy is associated with a poor prognosis. However, the mechanism underlying the resistance of CCC to platinum has not yet been understood. We conducted the present study to clarify the mechanism of cisplatin (CDDP) resistance in CCC cells. Eleven CCC and 5 serous adenocarcinoma (SAC) cell lines were used in this study. The IC(50) to CDDP ranged from 1.3 to 18.0 microM for CCC cells and from 2.2 to 13.0 microM for SAC cells. There was no correlation between multidrug resistance-associated protein expression and the sensitivity to CDDP in CCC cells. In contrast, the doubling time for CCC cells was significantly longer than that for SAC cells (61.4 vs. 29.8 h). A significant reverse correlation between the S-phase fraction and the response to CDDP was observed (r = 0.647, p < 0.05). The present study suggests that the resistance of CCC to CDDP may be caused by low cell proliferation.
Itamochi
Hiroaki
H
Department of Obstetrics and Gynecology, Tottori University, Yonago, Japan.
Kigawa
Junzo
J
Akeshima
Ryoji
R
Sato
Shinya
S
Kamazawa
Shunji
S
Takahashi
Masakuni
M
Kanamori
Yasunobu
Y
Suzuki
Mitsuaki
M
Ohwada
Michitaka
M
Terakawa
Naoki
N
D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics / Q000378:metabolism; D018262:Adenocarcinoma, Clear Cell / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D002945:Cisplatin / Q000494:pharmacology*; D018284:Cystadenocarcinoma, Serous / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D017931:DNA Primers / Q000737:chemistry; D019008:Drug Resistance, Neoplasm; D005260:Female; D006801:Humans; D020128:Inhibitory Concentration 50; D026901:Membrane Transport Proteins; D000089762:Multidrug Resistance-Associated Protein 2; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000235:genetics / Q000378:metabolism; D010051:Ovarian Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016196:S Phase / Q000187:drug effects; D014407:Tumor Cells, Cultured / Q000187:drug effects / Q000378:metabolism
D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents; D002945:Cisplatin; D017931:DNA Primers; D026901:Membrane Transport Proteins; D000089762:Multidrug Resistance-Associated Protein 2; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D012333:RNA, Messenger; C421109:multidrug resistance-associated protein 1