Journal
MACROMOLECULAR BIOSCIENCE
Volume 10, Issue 10, Pages 1248-1256Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mabi.201000117
Keywords
block copolymers; drug delivery systems; micelles
Funding
- Chinese Ministry of Science and Technology [2009CB930000, 2010CB934000]
- NSF of China [20774020]
- National Science and Technology Major Project [2009ZX09310-006]
- Science and Technology Developing Foundation of Shanghai [074319117]
- Shanghai Education Committee [B112]
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A pH-sensitive polymer was synthesized by introducing the N-Boc-histidine to the ends of a PLGA-PEG-PLGA block copolymer. The synthesized polymer was confirmed to be biodegradable and biocompatible, well dissolved in water and forming micelles above the CMC. DOX was employed as a model anticancer drug. In vitro drug release from micelles of N-Boc-histidine-capped PLGA-PEG-PLGA exhibited significant difference between pH = 6.2 and pH = 7.4, whereas DOX release from micelles composed of un-capped virgin polymers was not significantly sensitive to medium pH. Uptake of DOX from micelles of the new polymer into MDA-MB-435 solid tumor cells was also observed, and pH sensitivity was confirmed. Hence, the N-Boc-histidine capped PLGA-PEG-PLGA might be a promising material for tumor targeting.
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