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Repositioning of proton pump inhibitors in cancer therapy

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Abstract

Drug repositioning, as a smart way to exploit new molecular targets of a known drug, has been gaining increasing attention in the discovery of anti-cancer drugs. Proton pump inhibitors (PPIs) as benzimidazole derivatives, which are essentially H+–K+-ATPases inhibitors, are commonly used in the treatment of acid-related diseases such as gastric ulcer. In recent years, exploring the new application of PPIs in anti-cancer field has become a hot research topic. Interestingly, cancer cells display an alkaline intracellular pH and an acidic extracellular pH. The extracellular acidity of tumors can be corrected by PPIs that are selectively activated in an acid milieu. It is generally believed that PPIs might provoke disruption of pH homeostasis by targeting V-ATPase on cancer cells, which is the theoretical basis for PPIs to play an anti-cancer role. Numerous studies have shown specialized effects of the PPIs on tumor cell growth, metastasis, chemoresistance, and autophagy. PPIs may really represent new anti-cancer drugs due to better safety and tolerance, the potential selectivity in targeting tumor acidity, and the ability to inhibit mechanism pivotal for cancer homeostasis. In this review, we focus on the new therapeutic applications of PPIs in multiple cancers, explaining the rationale behind this approach and providing practical evidence.

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Acknowledgements

This work was funded by the National Science Foundation of China Grants (81373450) and Major Project of Science and Technology of Shandong Province (2015ZDJS04001, 2015ZDXX0301A03).

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  1. Department of Pharmacology, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Shandong University, No. 44 Wen Hua Xi Road, Jinan, 250012, People’s Republic of China

    Zhen-Ning Lu, Bing Tian & Xiu-Li Guo

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  1. Zhen-Ning Lu
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  2. Bing Tian
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Correspondence to Xiu-Li Guo.

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Lu, ZN., Tian, B. & Guo, XL. Repositioning of proton pump inhibitors in cancer therapy. Cancer Chemother Pharmacol 80, 925–937 (2017). https://doi.org/10.1007/s00280-017-3426-2

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