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The Use of Hydrophilic Poly(N,N-dimethylacrylamide) for Promoting Engulfment of Magnetic γ-Fe2O3 Nanoparticles by Mammalian Cells

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γ-Fe2O3 nanoparticles obtained by coprecipitation of Fe(II) and Fe(III) chlorides with a base and subsequent oxidation were coated with a shell of hydrophilic biocompatible poly(N,N-dimethylacrylamide) (PDMAAm). Various initiators were attached to the iron oxide surface to enable the use of the “grafting-from” approach for immobilization of PDMAAm. They included 2,2′-azobis(2-methylpropanimidamide) dihydrochloride (AMPA), 2,2′-azobis(N-hydroxy-2-methylpropanimidamide) dihydrochloride (ABHA) and 4-cyano-4-{[1-cyano-3-(N-hydroxycarbamoyl)-1-methylpropyl]azo}pentanoic acid (CCHPA). Engulfment of PDMAAm-coated γ-Fe2O3 nanoparticles by murine J774.2 macrophages was investigated. Only some nanoparticles were engulfed by the macrophages. PDMAAm-AMPA-γ-Fe2O3 and PDMAAm-ABHA-γ-Fe2O3 nanoparticles were rapidly engulfed by the cells. In contrast, neat γ-Fe2O3 and PDMAAm-CCHPA-γ-Fe2O3 particles induced formation of transparent vacuoles indicating toxicity of the particles. Thus, PDMAAm-coated AMPA- and ABHA-γ-Fe2O3 nanoparticles can be recommended as non-toxic labels for mammalian cells.
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Document Type: Research Article

Publication date: March 1, 2013

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  • Journal of Biomedical Nanotechnology (JBN) is a peer-reviewed multidisciplinary journal providing broad coverage in all research areas focused on the applications of nanotechnology in medicine, drug delivery systems, infectious disease, biomedical sciences, biotechnology, and all other related fields of life sciences.
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