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Long-circulating PEG-PE micelles co-loaded with paclitaxel and elacridar (GG918) overcome multidrug resistance.
MedLine Citation:
PMID:  23030458     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Overexpression of drug efflux pump P-gp is one of the major reasons to cause multidrug resistance (MDR). To overcome P-gp mediated MDR, modulators, so called P-gp inhibitors, can be used to block efflux pump activity. Elacridar is one of the most potent P-gp inhibitors, which can cause irreversible and total P-gp blockage. Elacridar, among with other P-gp inhibitors, can be used in combination with anticancer drugs to enhance the effectiveness of chemotherapy against resistant tumor cells. On the other hand, P-gp is presented in normal tissues, thus non-selective blockage of P-gp can cause undesired side effects. Therefore, it is important to deliver P-gp inhibitor only to the tumor cells (along with anticancer drug) and limit its distribution in the body. In this study, we have developed PEG-PE-based long-circulating ca. 15 nm micelles co-loaded with elacridar and paclitaxel, and investigated their ability to overcome paclitaxel resistance in two cancer cell lines. Vitamin E, a common solubility enhancer for PEG-PE micelles, was found to have a negative effect on both particle size and encapsulation efficiencies. The human MDR1 gene-transfected and thus paclitaxel-resistant MDCKII-MDR1 P-gp overexpressing cells were used for cytotoxicity evaluation. Even though PEG-PE based micelles itself have a potential to enhance the cytotoxicity of paclitaxel, elacridar/paclitaxel-co-loaded micelles demonstrated the highest cytotoxicity compared to both free and micellar paclitaxel. The obtained results suggest that co-loading of paclitaxel and elacridar into micellar drug carriers results in promising preparations capable of overcoming paclitaxel resistance.
Authors:
Can Sarisozen; Imran Vural; Tatyana Levchenko; A Atilla Hincal; Vladimir P Torchilin
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-3
Journal Detail:
Title:  Drug delivery     Volume:  -     ISSN:  1521-0464     ISO Abbreviation:  Drug Deliv     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9417471     Medline TA:  Drug Deliv     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University , Ankara , Turkey.
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