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Role of Na+, K+-ATPase α1 subunit in the intracellular accumulation of cisplatin

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Abstract

The present study was undertaken to identify what regulates intracellular cisplatin (CDDP) accumulation and what changes in membrane fraction of CDDDP-resistant cell line. The CDDP-resistant rat hepatoma cell line, H4-II-E/CDDP, shows a significant decrease in intracellular platinum accumulation compared with parental H4-II-E cells, although there was no difference in the efflux of CDDP between these two cell lines. In this study, we examined the contribution of functional change in active transport to the CDDP resistance of H4-II-E/CDDP cells. Compared with the resistant cells, platinum accumulation in the parental cells was clearly decreased by low temperature or ATP depletion. In addition, the Na+, K+-ATPase inhibitor ouabain and the K+ channel inhibitor tetraethylammonium decreased platinum accumulation in parental cells but did not change the accumulation in resistant cells. Amphotericin B, an antifungal agent, increased the intracellular platinum accumulation in resistant cells to the same level as in parent cells. Western blot analysis demonstrated that the Na+, K+-ATPase α1 subunit was reduced in resistant cells compared with the parental cells, although there was no difference in the expression of the β1 subunit between the two cell lines. Furthermore, the Na+, K+-ATPase α1 subunit of H4-II-E was decreased following a 24-h exposure to CDDP. These results suggest that Na+, K+-ATPase-dependent active transport of CDDP does not occur in resistant cells, and, furthermore, our findings provide the first evidence that the Na+, K+-ATPase α1 subunit plays an important role in the transport of CDDP.

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Authors and Affiliations

  1. Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Kobe Gakuin University, Arise Ikawadani-cho, Nishi-ku, Kobe, 651-2180, Japan

    Shuichi Kishimoto, Yuji Kawazoe, Mako Ikeno, Mizuha Saitoh, Yukari Nakano, Yuko Nishi, Shoji Fukushima & Yoshikazu Takeuchi

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  1. Shuichi Kishimoto
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  2. Yuji Kawazoe
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  3. Mako Ikeno
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  4. Mizuha Saitoh
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  5. Yukari Nakano
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  6. Yuko Nishi
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  7. Shoji Fukushima
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  8. Yoshikazu Takeuchi
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Correspondence to Shuichi Kishimoto.

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Kishimoto, S., Kawazoe, Y., Ikeno, M. et al. Role of Na+, K+-ATPase α1 subunit in the intracellular accumulation of cisplatin. Cancer Chemother Pharmacol 57, 84–90 (2006). https://doi.org/10.1007/s00280-005-0003-x

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  • DOI: https://doi.org/10.1007/s00280-005-0003-x

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