title: Multicompartment micelles with adjustable poly(ethylene glycol) shell for efficient in vivo photodynamic therapy.
abstract: We describe the preparation of well-defined multicompartment micelles from polybutadiene-block-poly(1-methyl-2-vinyl pyridinium methyl sulfate)-block-poly(methacrylic acid) (BVqMAA) triblock terpolymers and their use as advanced drug delivery systems for photodynamic therapy (PDT). A porphyrazine derivative was incorporated into the hydrophobic core during self-assembly and served as a model drug and fluorescent probe at the same time. The initial micellar corona is formed by negatively charged PMAA and could be gradually changed to poly(ethylene glycol) (PEG) in a controlled fashion through interpolyelectrolyte complex formation of PMAA with positively charged poly(ethylene glycol)-block-poly(L-lysine) (PLL-b-PEG) diblock copolymers. At high degrees of PEGylation, a compartmentalized micellar corona was observed, with a stable bottlebrush-on-sphere morphology as demonstrated by cryo-TEM measurements. By in vitro cellular experiments, we confirmed that the porphyrazine-loaded micelles were PDT-active against A549 cells. The corona composition strongly influenced their in vitro PDT activity, which decreased with increasing PEGylation, correlating with the cellular uptake of the micelles. Also, a PEGylation-dependent influence on the in vivo blood circulation and tumor accumulation was found. Fully PEGylated micelles were detected for up to 24 h in the bloodstream and accumulated in solid subcutaneous A549 tumors, while non- or only partially PEGylated micelles were rapidly cleared and did not accumulate in tumor tissue. Efficient tumor growth suppression was shown for fully PEGylated micelles up to 20 days, demonstrating PDT efficacy in vivo.
authors.affiliation: Makromolekulare Chemie II, Universität Bayreuth , D-95440 Bayreuth, Germany.
authors.forename: Christopher V
authors.initials: CV
authors.lastname: Synatschke
authors.forename: Takahiro
authors.initials: T
authors.lastname: Nomoto
authors.forename: Horacio
authors.initials: H
authors.lastname: Cabral
authors.forename: Melanie
authors.initials: M
authors.lastname: Förtsch
authors.forename: Kazuko
authors.initials: K
authors.lastname: Toh
authors.forename: Yu
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: Kozo
authors.initials: K
authors.lastname: Miyazaki
authors.forename: Andreas
authors.initials: A
authors.lastname: Hanisch
authors.forename: Felix H
authors.initials: FH
authors.lastname: Schacher
authors.forename: Akihiro
authors.initials: A
authors.lastname: Kishimura
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Nishiyama
authors.forename: Axel H E
authors.initials: AH
authors.lastname: Müller
authors.forename: Kazunori
authors.initials: K
authors.lastname: Kataoka
mesh_terms: D020128:Inhibitory Concentration 50; D008823:Micelles; D046529:Microscopy, Electron, Transmission / Q000379:methods; D010778:Photochemotherapy; D011092:Polyethylene Glycols / Q000737:chemistry*
chemical_list: D008823:Micelles; D011092:Polyethylene Glycols