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. 1993 Mar;84(3):336–340. doi: 10.1111/j.1349-7006.1993.tb02875.x

Hyperthermic Enhancement of Cytotoxicity and Increased Uptake of cis‐Diamminedichloroplatinum(II) in Cultured Human Esophageal Cancer Cells

Tokiharu Miyahara 1,✉, Kunihiro Ueda 2, Mitsuhiko Akaboshi 3, Yutaka Shimada 1, Masayuki Imamura 1, Hiroshi Utsumi 4
PMCID: PMC5919142  PMID: 8486532

Abstract

Thermal enhancement of cytotoxicity of cis‐diamminedichloroplatinum(II) (CDDP) has been well recognized and applied clinically to chemotherapy of various malignancies, but its fundamental mechanism remains to be elucidated. In order to obtain a clue to this mechanism, we analyzed the effect of hyperthermia on the uptake and subsequent distribution of [195mPt]CDDP in two lines of esophageal cancer cells (KYSE‐150 and KYSE‐170) established from clinical patients. First, we observed a significant increase in [195mPt]CDDP uptake by both types of cells at increasingly higher temperatures. The incorporated CDDP was distributed between the nucleus and the cytosol at a ratio of approximately 3:1, and the ratio remained the same at various temperatures. The CDDP was found in all four molecular fractions, i.e., DNA, RNA, protein, and TCA‐soluble, with a slight preference for DNA at higher temperatures. Enhancement of cytotoxicity required simultaneous, and not sequential, treatments with CDDP and hyperthermia; hyperthermia after CDDP treatment increased the efflux of CDDP from the cells, and rather reduced the cytotoxicity of CDDP. These results suggest that thermal enhancement of the cytotoxicity of CDDP is caused mainly by acceleration of the drug entry into the cell, probably due to increased permeability, and a consequent increase in the amount of CDDP binding to DNA. This mechanism gives support for clinical trial of simultaneous treatment with CDDP and hyperthermia.

Keywords: Esophageal cancer, cis‐Diamminedichloroplatinum(II), Hyperthermia, [195mPt]CDDP

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