Abstract
The expression of drug efflux mechanisms by cancer cells during chemotherapy leads to multidrug resistance (MDR) and constitutes a major obstacle in the effective treatment of cancer. The most widely characterized drug efflex pump is P-glycoprotein (P-gp) and efforts are being directed towards identifying agents that reverse P-gp mediated drug resistance. PSC-833 is a non-immunosuppressive cyclosporin derivative that potently and specifically inhibits P-gp. The current review focuses on the elucidation of the mechanism of action of PSC-833 as a potential MDR reversing agent, using syngeneic multidrug resistant sublines of MDA435 human breast adenocarcinoma cell line that express increasing levels of P-gp. In vitro experiments indicate that PSC-833 interacts directly with P-gp with high affinity and probably interferes with the ATPase activity of P-gp. Studies in multidrug resistant tumor models confirm P-gp as the in vivo target of PSC-833 and demonstrate the ability of PSC-833 to reverse MDR leukemias and solid tumors in mice. Presently, PSC-833 is being evaluated in the clinic.
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Atadja, P., Watanabe, T., Xu, H. et al. PSC-833, a frontier in modulation of P-glycoprotein mediated multidrug resistance. Cancer Metastasis Rev 17, 163–168 (1998). https://doi.org/10.1023/A:1006046201497
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DOI: https://doi.org/10.1023/A:1006046201497