pH-responsive polymer micelles for methotrexate delivery at tumor microenvironments

Methotrexate (MTX) anticancer drug was successfully loaded and released in a controlled manner from polymer micelles made of a diblock copolymer of poly(monomethoxy ethylene glycol)- -poly(ε-caprolactone) (mPEG-PCL). The empty and MTX-loaded micelles (MTX/mPEG-PCL) were characterized by electron mic...

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Bibliographic Details
Published in:e-Polymers 2020-01, Vol.20 (1), p.624-635
Main Authors: Carrillo-Castillo, Teresa Darlen, Castro-Carmona, Javier Servando, Luna-Velasco, Antonia, Zaragoza-Contreras, Erasto Armando
Format: Article
Language:English
Subjects:
Block copolymers
cancer treatment
copolymer micelles
drug delivery system
Drug delivery systems
encapsulation efficiency
Ethylene glycol
Materials science
Methotrexate
Micelles
MPEG encoders
Polymers
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Summary:Methotrexate (MTX) anticancer drug was successfully loaded and released in a controlled manner from polymer micelles made of a diblock copolymer of poly(monomethoxy ethylene glycol)- -poly(ε-caprolactone) (mPEG-PCL). The empty and MTX-loaded micelles (MTX/mPEG-PCL) were characterized by electron microscopy. The drug release dependence upon pH 5.4, 6.5, and 7.4 for 30 days was proven and characterized by UV-Vis spectroscopy. The cytotoxic effect of MTX/mPEG-PCL micelles on MCF-7 breast cancer cells was evaluated through an MTT assay. The morphological analysis indicated the successful formation of micelles of 76 and 131 nm for empty and MTX-loaded micelles, respectively. An encapsulation efficiency of 70.2% and a loading capacity of 8.8% were obtained. The release of MTX showed a gradual and sustained profile over 22 days, with a clear trend to much higher release at acidic pH (80 and 90% for pH 6.7 and 5.5, respectively). The MTX/mPEG-PCL micelles showed an IC of MCF-7 cells at 30 µg mL . The results suggested that MTX/mPEG-PCL could be a promising drug delivery system for cancer treatment. pH-responsive copolymer micelles for methotrexate delivery
ISSN:2197-4586
1618-7229
DOI:10.1515/epoly-2020-0064