title: Core-cross-linked micelles synthesized by clicking bifunctional Pt(IV) anticancer drugs to isocyanates.
abstract: Most low molecular weight platinum-based anticancer drugs have a short circulation time in the bloodstream. One of the potential strategies to improve the targeted delivery of cisplatin and prolong its circulation is via the use of nanocarriers. An improved drug delivery system was developed via reversible addition-fragmentation chain transfer (RAFT) polymerization. In a one-pot reaction, the incorporation of anticancer drug and core cross-linking was simultaneously carried out by using the highly effective reaction of isocyanate groups in the core of the polymeric micelles poly(oligo(ethylene glycol) methyl ether methacrylate)-block-poly(styrene-co-3-isopropenyl-α,α-dimethylbenzyl isocyanate) (POEGMA-block-P(STY-co-TMI)) with amine groups in the prepared platinum(IV) drug. The micelles with platinum(IV) incorporated with a size of 36 nm were very stable in water. In a reductive environment, in this study simulated using ascorbate, the drug was released at a slow rate of 82% in 22 days and at the same time the cross-linked micelle broke down into free block copolymers as evidenced using inductively coupled plasma-mass spectrometer (ICP-MS), size exclusion chromatography (SEC), and dynamic light scattering (DLS). The in vitro study also revealed the promising antitumor activity of prepared platinum(IV) drugs encapsulated into the micelle structure.
authors.affiliation: Centre of Advanced Macromolecular Design (CAMD), The University of New South Wales, Sydney NSW 2052, Australia.
authors.forename: Hien T T
authors.initials: HT
authors.lastname: Duong
authors.forename: Vien T
authors.initials: VT
authors.lastname: Huynh
authors.forename: Paul
authors.initials: P
authors.lastname: de Souza
authors.forename: Martina H
authors.initials: MH
authors.lastname: Stenzel
mesh_terms: D000970:Antineoplastic Agents / Q000737:chemistry* / Q000494:pharmacology; D002850:Chromatography, Gel; D004337:Drug Carriers; D016503:Drug Delivery Systems; D006801:Humans; D017953:Isocyanates / Q000737:chemistry*; D008175:Lung Neoplasms / Q000188:drug therapy*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008823:Micelles; D009944:Organoplatinum Compounds / Q000737:chemistry* / Q000494:pharmacology; D011092:Polyethylene Glycols / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D017550:Spectroscopy, Fourier Transform Infrared; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D004337:Drug Carriers; D017953:Isocyanates; D008823:Micelles; D009944:Organoplatinum Compounds; D011108:Polymers; D011092:Polyethylene Glycols