کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4982712 | 1454243 | 2018 | 7 صفحه PDF | دانلود رایگان |
- Superparamagnetic γ-Fe2O3 nanoparticles were prepared by two different approaches.
- Several carbohydrates and polymers formed the surface shells.
- Toxicity, hyperthermia measurements, and colon cancer cellular uptake was determined.
- Poly(N,N-dimethylacrylamide) coating hampered internalization by colon cancer cells.
- The particles can be prospectively used for in vivo colon cancer theranostics.
Magnetic nanoparticles offer multiple possibilities for biomedical applications. Besides their physico-chemical properties, nanoparticle-cellular interactions are determinant for biological safety. In this work, magnetic nanoparticles were synthesized by one-shot precipitation or two-step reaction and coated with biocompatible polymers, such as poly(l-lysine) and poly(N,N-dimethylacrylamide-co-acrylic acid), and carbohydrates, like l-ascorbic acid, d-galactose, d-mannose, and sucrose. The resulting magnetic nanoparticles were characterized by dynamic light scattering, FT-Raman spectroscopy, transmission electron microscopy, SQUID magnetometry, and Mössbauer spectroscopy. Ability of the nanoparticles to be used in theranostic applications was also evaluated, showing that coating with biocompatible polymers increased the heating efficiency. Nanoparticles synthesized by one-shot precipitation were 50% larger (â¼13 nm) than those obtained by a two-step reaction (â¼8 nm). Magnetic nanoparticles at concentrations up to 500 μg mLâ1 were non-cytotoxic to L929 fibroblasts. Particles synthesized by one-shot precipitation had little effect on viability, cell cycle and apoptosis of the three human colon cancer cell lines used: Caco-2, HT-29, and SW-480. At the same concentration (500 μg mLâ1), magnetic particles prepared by a two-step reaction reduced colon cancer cell viability by 20%, affecting cell cycle and inducing cell apoptosis. Uptake of surface-coated magnetic nanoparticles by colon cancer cells was dependent on particle synthesis, surface coating and incubation time.
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Journal: Colloids and Surfaces B: Biointerfaces - Volume 161, 1 January 2018, Pages 35-41