Nano Archive

Copolymeric nanofilm platform for controlled and localized therapeutic delivery

Chow, Edward Kai-Hua and Pierstorff, Erik and Cheng, Genhong and Ho, Dean (2008) Copolymeric nanofilm platform for controlled and localized therapeutic delivery. ACS NANO, 2 (1). pp. 33-40.

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Nanomaterials such as block copolymeric membranes provide a platform for both cellular interrogation and biological mimicry. Their biomimetic properties are based upon the innate possession of hydrophilic and hydrophobic units that enable their integration with a broad range of therapeutic materials. As such, they can be engineered for specific applications in nanomedicine, including controlled/localized drug delivery. Here we describe a method for the functionalization of the polymethyloxazoline-polydimethylsiloxane-polymethyloxazoline (PMOXA-PDMS-PMOXA) block copolymer with anti-inflammatory molecules to develop copolymer-therapeutic hybrids, effectively conferring biological functionality to a versatile synthetic nanomembrane matrix and creating a platform for an anti-inflammatory drug delivery system. Utilizing self-assembly and Langmuir-Blodgett deposition methods, we mixed copolymers with dexamethasone (Dex), an anti-inflammatory glucocorticoid receptor agonist. The successful mixing of the copolymer with the drug was confirmed by surface pressure isotherms and fluorescence microscopy. Furthermore, at 4 nm thick per layer, orders of magnitude thinner than conventional drug delivery coatings, these dexamethasone-copolymer mixtures (PolyDex) suppressed in vitro expression of the inflammatory cytokines/signaling elements interleukin 6 (IL-6), interleukin 12 (IL-12), tumor necrosis factor alpha (TNF alpha), inducible nitric oxide synthase (iNOS), and interferon gamma inducible protein (IP-10). Finally, PolyDex maintained its anti-inflammatory properties in vivo confirmed through punch biopsies with tissue imagery via hematoxylin/eosin and macrophage specific staining using CD11b. Thus, we demonstrated that PolyDex may be utilized as a localized, highly efficient drug-copolymer composite for active therapeutic delivery to confer anti-inflammatory protection or as a platform material for broad drug elution capabilities.

Item Type:Article
Uncontrolled Keywords:nanomedicine; drug delivery; bionanotechnology; block copolymer; inflammation; nanomaterials
Subjects:Material Science > Bio materials
Biomedical Science > Nanotechnology for human health
Biomedical Science > Nanomedicine
ID Code:491
Deposited On:04 Dec 2008 14:06
Last Modified:04 Dec 2008 14:06

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