title: Preparation of novel ferrocene-based shell cross-linked thermoresponsive hybrid micelles with antitumor efficacy.
abstract: The shell cross-linked (SCL) thermoresponsive hybrid poly(N-isopropylacrylamide-co-aminoethyl methacrylate)-b-polymethyl methacrylate (P(NIPAAm-co-AMA)-b-PMMA) micelle consisting of a cross-linked thermoresponsive hybrid shell and a hydrophobic core domain was fabricated via a two-step process: micellization of P(NIPAAm-co-AMA)-b-PMMA in aqueous solution followed by cross-linking of the hydrophilic shell layer via the amidation reaction between the amine groups of AMA units and the carboxylic acid functions of 1,1'-ferrocenedicarboxylic acid. The SCL micelle showed reversible dispersion/aggregation in response to the temperature cycles through the lower critical solution temperature (LCST) of the thermoresponsive hybrid shell at around 36 degrees C, observed by turbidity measurements and dynamic light scattering (DLS). Besides the usage as an inorganic difunctional cross-linker, the inorganic ferrocene segment further endowed the SCL hybrid micelle with the antitumor efficacy, namely, the resulting SCL micelle exhibited a remarkable cytotoxic effect for HeLa cells with a very low IC50. The results showed that the SCL hybrid micelle developed in this study could be potentially used as an antitumor agent, which is unique compared to the conventional tumor therapy by using the antitumor drug loaded in the micellar core.
authors.affiliation: Key Laboratory of Biomedical Polymers of Ministry of Education & Department of Chemistry, Wuhan University, Wuhan 430072, People's Republic of China.
authors.forename: Hua
authors.initials: H
authors.lastname: Wei
authors.forename: Chang-Yun
authors.initials: CY
authors.lastname: Quan
authors.forename: Cong
authors.initials: C
authors.lastname: Chang
authors.forename: Xian-Zheng
authors.initials: XZ
authors.lastname: Zhang
authors.forename: Ren-Xi
authors.initials: RX
authors.lastname: Zhuo
mesh_terms: D000178:Acrylamides / Q000737:chemistry* / Q000494:pharmacology*; D000588:Amines / Q000737:chemistry; D000970:Antineoplastic Agents / Q000737:chemistry* / Q000494:pharmacology*; D001565:Benzoates / Q000737:chemistry*; D002470:Cell Survival / Q000187:drug effects; D003432:Cross-Linking Reagents / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D006367:HeLa Cells; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D000075163:Metallocenes; D008689:Methacrylates / Q000737:chemistry* / Q000494:pharmacology*; D008823:Micelles; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000178:Acrylamides; D000588:Amines; D000970:Antineoplastic Agents; D001565:Benzoates; D003432:Cross-Linking Reagents; D005296:Ferrous Compounds; D000075163:Metallocenes; D008689:Methacrylates; D008823:Micelles; C517217:ferrocene dicarboxylic acid; C509363:poly(N-isopropylacrylamide-b-methyl methacrylate); D014867:Water