TITLE

In vitro sequence-dependent interaction between nedaplatin and paclitaxel in human cancer cell lines

AUTHOR(S)
Tanaka, Risa; Takii, Yasushi; Shibata, Yoshihiro; Ariyama, Hiroshi; Qin, Baoli; Baba, Eishi; Kusaba, Hitoshi; Mitsugi, Kenji; Harada, Mine; Nakano, Shuji
PUB. DATE
September 2005
SOURCE
Cancer Chemotherapy & Pharmacology;Sep2005, Vol. 56 Issue 3, p279
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Purpose: To define the most effective combination schedule of paclitaxel and nedaplatin, a new platinum derivative, we investigated the in vitro interaction between these drugs in AZ-521 and NUGC-4 gastric adenocarcinoma and KSE-1 esophageal squamous carcinoma cell lines. Materials and methods: Cytotoxic activity was determined by the WST-1 assay. Different treatment schedules of the two drugs were compared and evaluated for synergism, additivity, or antagonism using a quantitative method based on the median-effect principle of Chou and Talalay. Cell-cycle perturbation and apoptosis were evaluated by means of flow cytometry. Results: Upon 24-h sequential exposure, the sequence paclitaxel followed by nedaplatin induced greater than additive effects in all of the cell lines, with synergistic interactions in NUGC-4 and KSE-1 cells. By contrast, antagonistic effects were observed with the reverse sequence. Simultaneous treatment resulted in either a synergistic or antagonistic effect, depending on the cell line. Therefore, the sequence paclitaxel followed by nedaplatin appears most active, at least in these three cell lines. Flow cytometric analyses at IC50 indicated that paclitaxel induced G2/M arrest with subsequent induction of apoptosis (56%) in the sub-G1 phase. When paclitaxel preceded nedaplatin, apoptosis was most prominent (70%) with pronounced G2/M arrest. By contrast, the reverse sequence yielded only 28% induction of apoptotic cells, with almost identical cell-cycle distribution patterns to those observed with nedaplatin alone, indicating that the activity of paclitaxel is abolished by pretreatment with nedaplatin. Conclusions: Our findings suggest that the interaction of nedaplatin and paclitaxel is highly schedule dependent and that the sequential administration of paclitaxel followed by nedaplatin should be thus incorporated into the design of a clinical trial.
ACCESSION #
17482506

 

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