Journal
ADVANCED DRUG DELIVERY REVIEWS
Volume 54, Issue 5, Pages 759-779Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0169-409X(02)00047-9
Keywords
anthracyclines; cancer; MDR; P-glycoprotein; multidrug resistant protein; MRP; block copolymer
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Funding
- NCI NIH HHS [CA89225] Funding Source: Medline
- NINDS NIH HHS [NS36229] Funding Source: Medline
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Pluronic(R) block copolymers have been used extensively in a variety of pharmaceutical formulations including delivery of low molecular mass drugs and polypeptides. This review describes novel applications of Pluronic(R) block copolymers in the treatment of drug-resistant tumors. It has been discovered that Pluronic(R) block copolymers interact with multi drug-resistant cancer (MDR) tumors resulting in drastic sensitization of these tumors with respect to various anticancer agents, particularly, anthracycline antibiotics. Furthermore, Pluronic(R) affects several distinct drug resistance mechanisms including inhibition of drug efflux transporters, abolishing drug sequestration in acidic vesicles as well as inhibiting the glutathione/glutathione S-transferase detoxification system. All these mechanisms of drug resistance are energy-dependent and therefore ATP depletion induced by Pluronic(R) block copolymers in MDR cells is considered as one potential reason for chemosensitization of these cells. Following validation using in vitro and in vivo models, a formulation containing doxorubicin and Pluronic(R) mixture (L61 and F127), SP1049C, has been evaluated in phase I clinical trials. Further mechanistic studies and clinical evaluations of these systems are in progress. (C) 2002 Elsevier Science B.V. All rights reserved.
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