Summary
Poor aqueous solubility limits the therapeutic index of paclitaxel as an anti-cancer drug. Synthesis of soluble prodrugs of paclitaxel, or conjugation of the drug to macromolecular carriers have been reported to increase its water-solubility. Macromolecular drug carriers have an added advantage of targeting the drug to the tumor site due to the abnormal tumor blood and lymphatic vasculature. This study describes a thermally responsive macromolecular carrier, elastin-like polypeptide (ELP) for the delivery of paclitaxel. Paclitaxel was bound to ELP by conjugation with the 6-maleimidocaproyl hydrazone derivative of paclitaxel, an acid-sensitive paclitaxel prodrug, for the potential treatment of breast cancer. Focused hyperthermia above a specific transition temperature at the site of a tumor causes ELP to aggregate and accumulate, thereby increasing the local concentration of the drug cargo. The paclitaxel prodrug described here bears an acid-sensitive linker that is cleavable at the lysosomal/endosomal pH, which allows a controlled intracellular release of the drug. The ELP-delivered paclitaxel in the presence of hyperthermia inhibits MCF-7 cell proliferation by stabilizing the microtubule structures, arresting the cells at the G2/M stage, and inducing apoptosis in a manner similar to conventional paclitaxel. It also inhibits proliferation of a paclitaxel resistant MCF-7 cell line. These data provide an in vitro proof of concept for the use of ELP as a delivery vehicle of paclitaxel.
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Acknowledgements
This research was supported by grants from the National Science Foundation (CBET-0931041) and the National Institute of Health (R43 CA135799-01A2). We thank Ms. Rowshan Begum for purification of the proteins used in the study, and Dr. Gene L. Bidwell III and Ms. Emily H. Thomas for helpful discussion.
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Moktan, S., Ryppa, C., Kratz, F. et al. A thermally responsive biopolymer conjugated to an acid-sensitive derivative of paclitaxel stabilizes microtubules, arrests cell cycle, and induces apoptosis. Invest New Drugs 30, 236–248 (2012). https://doi.org/10.1007/s10637-010-9560-x
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DOI: https://doi.org/10.1007/s10637-010-9560-x