{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,26]],"date-time":"2025-11-26T16:46:14Z","timestamp":1764175574451,"version":"build-2065373602"},"reference-count":63,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2024,3,2]],"date-time":"2024-03-02T00:00:00Z","timestamp":1709337600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"German Research Council","award":["CI107\/11-1-2","CI107\/14-1"],"award-info":[{"award-number":["CI107\/11-1-2","CI107\/14-1"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Cisplatin (CDDP) stands out as an effective chemotherapeutic agent; however, its application is linked to the development of significant adverse effects, notably nephro- and ototoxicity. The human organic cation transporter 2 (hOCT2), found in abundance in the basolateral membrane domain of renal proximal tubules and the Corti organ, plays a crucial role in the initiation of nephro- and ototoxicity associated with CDDP by facilitating its uptake in kidney and ear cells. Given its limited presence in cancer cells, hOCT2 emerges as a potential druggable target for mitigating unwanted toxicities associated with CDDP. Potential strategies for mitigating CDDP toxicities include competing with the uptake of CDDP by hOCT2 or inhibiting hOCT2 activity through rapid regulation mediated by specific signaling pathways. This study investigated the interaction between the already approved cationic drugs disopyramide, imipramine, and orphenadrine with hOCT2 that is stably expressed in human embryonic kidney cells. Regarding disopyramide, its influence on CDDP cellular transport by hOCT2 was further characterized through inductively coupled plasma isotope dilution mass spectrometry. Additionally, its potential protective effects against cellular toxicity induced by CDDP were assessed using a cytotoxicity test. Given that hOCT2 is typically expressed in the basolateral membrane of polarized cells, with specific regulatory mechanisms, this work studied the regulation of hOCT2 that is stably expressed in Madin\u2013Darby Canine Kidney (MDCK) cells. These cells were cultured in a matrix to induce the formation of cysts, exposing hOCT2 in the basolateral plasma membrane domain, which was freely accessible to experimental solutions. The study specifically tested the regulation of ASP+ uptake by hOCT2 in MDCK cysts through the inhibition of casein kinase II (CKII), calmodulin, or p56lck tyrosine kinase. Furthermore, the impact of this manipulation on the cellular toxicity induced by CDDP was examined using a cytotoxicity test. All three drugs\u2014disopyramide, imipramine, and orphenadrine\u2014demonstrated inhibition of ASP+ uptake, with IC50 values in the micromolar (\u00b5M) range. Notably, disopyramide produced a significant reduction in the CDDP cellular toxicity and platinum cellular accumulation when co-incubated with CDDP. The activity of hOCT2 in MDCK cysts experienced a significant down-regulation under inhibition of CKII, calmodulin, or p56lck tyrosine kinase. Interestingly, only the inhibition of p56lck tyrosine kinase demonstrated the capability to protect the cells against CDDP toxicity. In conclusion, certain interventions targeting hOCT2 have demonstrated the ability to reduce CDDP cytotoxicity, at least in vitro. Further investigations in in vivo systems are warranted to ascertain their potential applicability as co-treatments for mitigating undesired toxicities associated with CDDP in patients.<\/jats:p>","DOI":"10.3390\/ijms25052922","type":"journal-article","created":{"date-parts":[[2024,3,4]],"date-time":"2024-03-04T05:31:12Z","timestamp":1709530272000},"page":"2922","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Modulating the Activity of the Human Organic Cation Transporter 2 Emerges as a Potential Strategy to Mitigate Unwanted Toxicities Associated with Cisplatin Chemotherapy"],"prefix":"10.3390","volume":"25","author":[{"given":"Anna","family":"Hucke","sequence":"first","affiliation":[{"name":"Experimental Nephrology, Department of Internal Medicine D, University Hospital M\u00fcnster, 48149 M\u00fcnster, Germany"},{"name":"Institute of Physiology I, University of M\u00fcnster, 48149 M\u00fcnster, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marta","family":"Kantauskaite","sequence":"additional","affiliation":[{"name":"Experimental Nephrology, Department of Internal Medicine D, University Hospital M\u00fcnster, 48149 M\u00fcnster, Germany"},{"name":"Klinik f\u00fcr Nephrologie, Universit\u00e4tsklinikum D\u00fcsseldorf, 40225 D\u00fcsseldorf, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tim N.","family":"K\u00f6pp","sequence":"additional","affiliation":[{"name":"Experimental Nephrology, Department of Internal Medicine D, University Hospital M\u00fcnster, 48149 M\u00fcnster, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christoph A.","family":"Wehe","sequence":"additional","affiliation":[{"name":"Institute of Inorganic and Analytical Chemistry, University of M\u00fcnster, 48149 M\u00fcnster, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1774-6787","authenticated-orcid":false,"given":"Uwe","family":"Karst","sequence":"additional","affiliation":[{"name":"Institute of Inorganic and Analytical Chemistry, University of M\u00fcnster, 48149 M\u00fcnster, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0572-9074","authenticated-orcid":false,"given":"Pavel I.","family":"Nedvetsky","sequence":"additional","affiliation":[{"name":"Experimental Nephrology, Department of Internal Medicine D, University Hospital M\u00fcnster, 48149 M\u00fcnster, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4365-3656","authenticated-orcid":false,"given":"Giuliano","family":"Ciarimboli","sequence":"additional","affiliation":[{"name":"Experimental Nephrology, Department of Internal Medicine D, University Hospital M\u00fcnster, 48149 M\u00fcnster, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,3,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Bai, Y., Aodeng, G., Ga, L., Hai, W., and Ai, J. 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