title: Tumoral acidic extracellular pH targeting of pH-responsive MPEG-poly(beta-amino ester) block copolymer micelles for cancer therapy.
abstract: The main objective of this study was to develop and characterize a pH-responsive and biodegradable polymeric micelle as a tumor-targeting drug delivery system. The pH-responsive block copolymer was synthesized by a Michael-type step polymerization of hydrophilic methyl ether poly(ethylene glycol) (MPEG) and pH-responsive and biodegradable poly(beta-amino ester), resulting in an amphiphilic MPEG-poly(beta-amino ester) block copolymer. This copolymer, which formed nano-sized self-assembled micelles under aqueous conditions, could be efficiently (74.5%) loaded with doxorubicin (DOX) using a solvent evaporation method. In an in vitro drug release study, these DOX-loaded polymeric micelles showed noticeable pH-dependent micellization-demicellization behavior, with rapid release of DOX from the micelles in weakly acidic environments (pH 6.4) but very slow release under physiological conditions (pH 7.4). Moreover, due to demicellization, the tumor cell uptake of DOX released from polymeric micelles was much higher at pH 6.4 than at pH 7.4. When in vivo anti-tumor activity of pH-responsive polymeric micelles was evaluated by injecting the DOX-loaded polymeric micelles into B16F10 tumor-bearing mice, these micelles notably suppressed tumor growth and also prolonged survival of the tumor-bearing mice, compared with mice treated with free DOX.
authors: Biomedical Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-719, South Korea.
authors: Jinyoung
authors: J
authors: Ko
authors: Kyeongsoon
authors: K
authors: Park
authors: Yoo-Shin
authors: YS
authors: Kim
authors: Min Sang
authors: MS
authors: Kim
authors: Jong Kwon
authors: JK
authors: Han
authors: Kwangmeyung
authors: K
authors: Kim
authors: Rang-Woon
authors: RW
authors: Park
authors: In-San
authors: IS
authors: Kim
authors: Hyun Kyu
authors: HK
authors: Song
authors: Doo Sung
authors: DS
authors: Lee
authors: Ick Chan
authors: IC
authors: Kwon
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology* / Q000627:therapeutic use; D045744:Cell Line, Tumor; D002626:Chemistry, Pharmaceutical; D003692:Delayed-Action Preparations; D004317:Doxorubicin / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology* / Q000627:therapeutic use; D004337:Drug Carriers; D004339:Drug Compounding; D004952:Esters / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008297:Male; D008546:Melanoma, Experimental / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D008823:Micelles; D053758:Nanoparticles; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012995:Solubility; D013678:Technology, Pharmaceutical / Q000379:methods
chemical_list: D000903:Antibiotics, Antineoplastic; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D004952:Esters; D008823:Micelles; D011108:Polymers; C507253:poly(beta-amino ester); D011092:Polyethylene Glycols; D004317:Doxorubicin; C028210:monomethoxypolyethylene glycol