title: Hollow chitosan/poly(acrylic acid) nanospheres as drug carriers.
abstract: The preparation, in-vitro release, in-vitro cytotoxicity, and in-vivo drug delivery of doxorubicin (DOX)-loaded chitosan (CS)-poly(acrylic acid) (PAA) hollow nanospheres were investigated. The loading was done by dissolving a certain amount of DOX in non-cross-linked CS-PAA nanospheres aqueous solution followed by cross-linking chitosan with glutaraldehyde. The drug-loading content was up to 4.3% and the size of drug-loaded hollow nanospheres, determined by dynamic light scattering, was 118 nm. The nanospheres showed a continuous release of the entrapped DOX up to 10 days in vitro and showed comparable in-vitro cytotoxicity against HepG2 cells compared to the free DOX. In-vivo DOX delivery of DOX-loaded CS-PAA nanospheres showed that DOX concentration in blood can be maintained for a longer period than free DOX solution, and the DOX concentration in mice liver can be maintained constantly at relatively high level. The interesting feature of DOX-loaded CS-PAA hollow nanopspheres is that the loaded DOX can be delivered into the mice brain. The confocal laser scanning microscopy analysis reveals that fluorescein isothiocyanate (FITC)-labeled CS-PAA can deposit in different organs including liver, spleen, and brain.
authors.affiliation: National Laboratory of Solid State Microstructure, Department of Material Science and Engineering, Nanjing University, Nanjing, 210093, P. R. China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Hu
authors.forename: Yin
authors.initials: Y
authors.lastname: Ding
authors.forename: Dan
authors.initials: D
authors.lastname: Ding
authors.forename: Mingjie
authors.initials: M
authors.lastname: Sun
authors.forename: Leyang
authors.initials: L
authors.lastname: Zhang
authors.forename: Xiqun
authors.initials: X
authors.lastname: Jiang
authors.forename: Changzheng
authors.initials: C
authors.lastname: Yang
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry* / Q000494:pharmacology; D000818:Animals; D001812:Blood-Brain Barrier / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D048271:Chitosan / Q000737:chemistry* / Q000494:pharmacology; D004317:Doxorubicin / Q000737:chemistry / Q000494:pharmacology; D004337:Drug Carriers / Q000737:chemistry* / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D051379:Mice; D008810:Mice, Inbred C57BL; D049329:Nanostructures / Q000737:chemistry*; D009928:Organ Specificity; D016062:Porosity; D013329:Structure-Activity Relationship; D013499:Surface Properties; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D004337:Drug Carriers; C006903:carbopol 940; D004317:Doxorubicin; D048271:Chitosan