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Adenosine enhances cisplatin sensitivity in human ovarian cancer cells

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Abstract

Ovarian cancer is the deadliest gynecologic cancer due to lack of early effective diagnosis and development of resistance to platinum-based chemotherapy. Several studies reported that adenosine concentrations are higher in tumor microenvironment than in non-tumor tissue. This finding inspired us to study the role of adenosine in ovarian cancer cells and to investigate if adenosine pathways offer new treatment options urgently needed to prevent or overcome chemoresistance. The ovarian cancer cell lines HEY, A2780, and its cisplatin-resistant subline A2780CisR were used in this study. Expression and functional activity of adenosine receptors were investigated by RT-PCR, Western blotting, and cAMP assay. A1 and A2B adenosine receptors were expressed and functionally active in all three cell lines. Adenosine showed moderate cytotoxicity (MTT-IC50 values were between 700 and 900 μM) and induced apoptosis in a concentration-dependent manner by increasing levels of sub-G1 and cleaved PARP. Apoptosis was diminished by QVD-OPh, confirming caspase-dependent induction of apoptosis. Forty-eight hours pre-incubation of adenosine prior to cisplatin significantly enhanced cisplatin-induced cytotoxicity in a synergistic manner and increased apoptosis. SLV320 or PSB603, selective A1 and A2B antagonists, was not able to inhibit adenosine-induced increase in cisplatin cytotoxicity or apoptosis whereas dipyridamole, a nucleoside transporter inhibitor, completely abrogated both effects. Mechanistically, adenosine increased pAMPK and reduced pS6K which was prevented by dipyridamole. In conclusion, application of adenosine prior to cisplatin could be a new therapeutic option to increase the potency of cisplatin in a synergistic manner and thus overcome platinum resistance in ovarian cancer.

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Funding

This study was supported by the Bundesministerium für Forschung (BMBF, Germany, Grant: BMBF-16GW0108). We acknowledge funding by the DFG for the Thermofisher Arrayscan XTI (Grant: INST 208/690-1 FUGG).

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Authors and Affiliations

  1. Institute of Pharmaceutical and Medicinal Chemistry, Heinrich-Heine University, Building 26.23.02, Universitaetsstrasse 1, 40225, Duesseldorf, Germany

    Parichat Sureechatchaiyan, Alexandra Hamacher, Nicole Brockmann & Matthias U. Kassack

  2. Institute of Molecular Medicine, Heinrich-Heine University, Universitaetsstrasse 1, 40225, Duesseldorf, Germany

    Bjoern Stork

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  1. Parichat Sureechatchaiyan
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  2. Alexandra Hamacher
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  3. Nicole Brockmann
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Correspondence to Matthias U. Kassack.

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Sureechatchaiyan, P., Hamacher, A., Brockmann, N. et al. Adenosine enhances cisplatin sensitivity in human ovarian cancer cells. Purinergic Signalling 14, 395–408 (2018). https://doi.org/10.1007/s11302-018-9622-7

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