Research Papers:

Organic cation transporter 3 mediates cisplatin and copper cross-resistance in hepatoma cells

Sarah Guttmann, Gursimran Chandhok, Sara Reinartz Groba, Christoph Niemietz, Vanessa Sauer, Amanda Gomes, Giuliano Ciarimboli, Uwe Karst, Andree Zibert and Hartmut H. Schmidt _

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Oncotarget. 2018; 9:743-754. https://doi.org/10.18632/oncotarget.23142

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Sarah Guttmann1,*, Gursimran Chandhok1,2,*, Sara Reinartz Groba1, Christoph Niemietz1, Vanessa Sauer1, Amanda Gomes1,3, Giuliano Ciarimboli4, Uwe Karst5, Andree Zibert1 and Hartmut H. Schmidt1

1Medizinische Klinik B für Gastroenterologie und Hepatologie, Universitätsklinikum Münster, Münster, Germany

2Present address: Monash Biomedicine Discovery Institute, and Department of Anatomy and Developmental Biology, Monash University, Clayton, Victoria, Australia

3Present address: Wilson Disease Clinic, Kokilaben Dhirubhai Ambani Hospital and Medical Research Institute, Mumbai, India

4Universitätsklinikum Münster, Medizinische Klinik D, Experimentelle Nephrologie, Münster, Germany

5Institute of Inorganic and Analytical Chemistry, University of Münster, Münster, Germany

*These authors contributed equally to this work

Correspondence to:

Hartmut H. Schmidt, email: [email protected]

Keywords: OCT3; ATP7B; MT1; cisplatin; copper cross-resistance

Received: June 30, 2017     Accepted: November 15, 2017     Published: December 12, 2017


Platinum-based drugs are first-line compounds in the treatment of many solid cancers. Major obstacles are tumors that become resistant and toxic side effects, both largely due to the expression of transporters that mediate the cellular processing of platinum. In this study, we addressed the establishment of cisplatin resistance in the absence of copper transporter ATP7B that has been previously found to be overexpressed in various resistant cells. Cisplatin sensitivity, induction of apoptosis, drug accumulation, and transporter gene expression were determined in hepatoma cell lines. Knockout or overexpression of copper transporter ATP7B did not affect cisplatin sensitivity. Cisplatin resistant cells showed a stably reduced cisplatin accumulation and a downregulation of organic cation transporter 3 (OCT3). In contrast, OCT3 overexpression could reverse resistance. Reduced MT1 expression was detected in the resistant cell line, however transient and highly dependent on the presence of cisplatin. Cross-resistance to copper was also associated with OCT3 downregulation. Our results suggest that a decreased level of OCT3 expression results in resistance to cisplatin and copper. OCT3 may represent a novel target for improved prognosis and anticancer therapy, including HCC.

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