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Research Article Free access | 10.1172/JCI118668

Redox control of resistance to cis-diamminedichloroplatinum (II) (CDDP): protective effect of human thioredoxin against CDDP-induced cytotoxicity.

T Sasada, S Iwata, N Sato, Y Kitaoka, K Hirota, K Nakamura, A Nishiyama, Y Taniguchi, A Takabayashi, and J Yodoi

Department of Biological Responses, Institute for Virus Research, Kyoto University, Japan.

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Department of Biological Responses, Institute for Virus Research, Kyoto University, Japan.

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Department of Biological Responses, Institute for Virus Research, Kyoto University, Japan.

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Department of Biological Responses, Institute for Virus Research, Kyoto University, Japan.

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Department of Biological Responses, Institute for Virus Research, Kyoto University, Japan.

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Department of Biological Responses, Institute for Virus Research, Kyoto University, Japan.

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Department of Biological Responses, Institute for Virus Research, Kyoto University, Japan.

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Department of Biological Responses, Institute for Virus Research, Kyoto University, Japan.

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Department of Biological Responses, Institute for Virus Research, Kyoto University, Japan.

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Department of Biological Responses, Institute for Virus Research, Kyoto University, Japan.

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Published May 15, 1996 - More info

Published in Volume 97, Issue 10 on May 15, 1996
J Clin Invest. 1996;97(10):2268–2276. https://doi.org/10.1172/JCI118668.
© 1996 The American Society for Clinical Investigation
Published May 15, 1996 - Version history
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Abstract

Thioredoxin is a small ubiquitous protein with multiple biological functions, including cellular defense mechanisms against oxidative stress. In the present study, we investigated the role of human thioredoxin (hTRX) in the acquisition of cellular resistance to cis-diamminedichloroplatinum (II) (CDDP). The expression and activity of hTRX in Jurkat T cells was dose-dependently enhanced by exposure to CDDP, as determined by immunoblot analysis and insulin reducing assay. Furthermore, chloramphenicol acetyltransferase analysis using the hTRX promoter-reporter gene construct revealed that treatment of Jurkat cells with CDDP caused transcriptional activation of the hTRX gene, which might be mediated through increased generation of intracellular reactive oxygen intermediates. To examine the biological significance of hTRX induction, we established hTRX-overexpressing derivatives of L929 fibrosarcoma cells by stable transfection with the hTRX cDNA. The clones, which constitutively expressed the exogenous hTRX, displayed increased resistance to CDDP-induced cytotoxicity, compared with the control clones. After exposure to CDDP, the control cells showed a significant increase in the intracellular accumulation of peroxides, whereas the hTRX-transfected cells did not. Taken together, these results suggest that overexpressed hTRX is responsible for the development of cellular resistance to CDDP, possibly by scavenging intracellular toxic oxidants generated by this anticancer agent.

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