New NO- and H2S-releasing doxorubicins as targeted therapy against chemoresistance in castration-resistant prostate cancer: in vitro and in vivo evaluations
Chemotherapy for castration-resistant prostate cancer (CRPC) is only temporarily effective due to the onset of chemoresistance. We investigated the efficacy of NO- and H2S-releasing doxorubicins (NitDox and H2SDox) in overcoming drug resistance and evaluated their safety. New and innovative NO- and H2S-releasing doxorubicins (NitDox and H2SDox) showed a good intracellular accumulation and high cytotoxic activity in vitro in an androgen-independent and doxorubicin-resistant DU-145 prostate cancer cell line. Nude mice were subcutaneously injected with 4*106 DU-145 cells and treated once a week for 3 weeks with 5 mg/kg doxorubicin, NitDox, H2SDox or vehicle, i.p. Animal weight, tumor volume, intra-tumoral drug accumulation, apoptosis and the presence of nitrotyrosine and sulfhydryl (SH) groups within the tumor, were evaluated. Cardiotoxicity was assessed by measuring troponin plasma levels and the left ventricular wall thickness. In vivo, NitDox and H2SDox accumulated inside the tumors, significantly reduced tumor volumes by 60%, increased the percentage of apoptotic cells in both the inner and the outer parts of the tumors and the presence of nitrotyrosine and SH groups. Doxorubicin treatment was associated with reduced body weight and cardiotoxicity. On the contrary, NitDox and H2SDox were well tolerated and had a better safety profile. Combining efficacy with reduced cardiovascular side effects, NitDox and H2SDox are promising novel therapeutic agents for reversing chemoresistance in CRCP.
KeywordsCastration-resistant prostate cancer Doxorubicin P-glycoprotein p
The authors are very grateful to Prof. Piero Dolara for critical reading of the manuscript and his useful suggestions.
This work was supported by Ministry of Education, University and Research (MIUR) by the grant FIRB 2012 code RBFR12SOQ1: “Optimization of oncology therapy: novel drugs affecting multidrug resistance”; Italian Association for Cancer Research (IG15232).
Compliance with ethical standards
Conflict of interest
Authors declare no conflicts of interest.
All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All animal care and experimental protocols were approved by the Italian Ministry of Health with authorization number 49/2016-PR 21/01/2016.
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