JaLCDOI 10.18926/AMO/31635
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Author Yamamoto, Junko| Miyagi, Yasunari| Kawanishi, Kunihiro| Yamada, Shinako| Miyagi, Yuji| Kodama, Junichi| Yoshinouchi, Mitsuo| Kudo, Takafumi|
Abstract <p>The pharmacodynamic effects of cisdiamminedichloroplatinum(II) (CDDP) in vitro have been reported, but the dosage and exposure time in vitro have not been based on clinical observations of the drug's actions in vivo. In this study, the authors attempted to evaluate the pharmacodynamic effects of CDDP in vitro in terms of cell survival and DNA crosslinking by simulating unbound CDDP administration at varying concentrations to a rat mammary adenocarcinoma line (known as line 66). CDDP exposure was conducted by both constant concentration procedures and a simulated in vivo procedure. Colony formation assay for the surviving fraction and alkaline elution assay for DNA crosslink measurement were performed in order to evaluate the pharmacodynamics of CDDP. Cell survival was a function of the area under the drug concentration time curve (AUC) of unbound CDDP (R2 = 0.77, P &#60; 0.002) for all drug exposure procedures as analyzed by the analysis of covariance test. There was a strong correlation between the surviving fraction and the crosslink index of the total amount of DNA crosslinks (R2 = 0.85, P &#60; 0.0005). Both the total amount of DNA-DNA crosslinks and the DNA-protein crosslinks, of which the latter were dominant, were affected not by the exposure procedures, but by the AUC value (P &#60; 0.002). The thresholds of cytocidal effect were 1.59 mg.h/l for the AUC and 0.008 for the crosslink index. The pharmacodynamic effects in vitro by simulated in vivo exposure were identical to those of constant.</p>
Keywords pharmacodynamics pharmacokinetics simulation cisplatin crosslink
Amo Type Article
Published Date 1999-10
Publication Title Acta Medica Okayama
Volume volume53
Issue issue5
Publisher Okayama University Medical School
Start Page 201
End Page 208
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
File Version publisher
Refereed True
PubMed ID 10561728
Web of Sience KeyUT 000083427100001