In vitro hyperthermia with improved colloidal stability and enhanced SAR of magnetic core/shell nanostructures

• Published in: Materials Science & Engineering C 2016-02, Vol.59, p.702-709
• Main Authors: Patil, R.M., Thorat, N.D., Shete, P.B., Otari, S.V., Tiwale, B.M., Pawar, S.H.
• Format: Article
• Language: English
• Subjects: Animals; Betaine - chemistry; Betaine - pharmacology; Coated Materials, Biocompatible - chemistry; Coated Materials, Biocompatible - pharmacology; Colloidal stability; Colloids; Cytotoxicity; Glucose; HeLa Cells; Hot Temperature; Humans; Hyperthermia; In vitro hyperthermia; In vitro testing; Magnetic cores; Magnetic fluid hyperthermia; Magnetite Nanoparticles - chemistry; Materials Testing; Media; Mice; Nanostructure; Oleic Acid - chemistry; Oleic Acid - pharmacology; Reactive oxygen species; Specific absorption rate; Stability
• ISSN: 0928-4931; 1873-0191
• DOI: 10.1016/j.msec.2015.10.064

Magnetic core/shell nanostructures of Fe3O4 nanoparticles coated with oleic acid and betaine-HCl were studied for their possible use in magnetic fluid hyperthermia (MFH). Their colloidal stability and heat induction ability were studied in different media viz. phosphate buffer solution (PBS), saline solution and glucose solution with different physiological conditions and in human serum. The results showed enhanced colloidal stability in these media owing to their high zeta potential values. Heat induction studies showed that specific absorption rates (SAR) of core/shells were 82–94W/g at different pH of PBS and concentrations of NaCl and glucose. Interestingly, core/shells showed 78.45±3.90W/g SAR in human serum. The cytotoxicity of core/shells done on L929 and HeLa cell lines using 3-(4,5-dimethylthiazol-2-yl)2,5-diphenyl tetrazolium bromide and trypan blue dye exclusion assays showed >89% and >80% cell viability for 24 and 48h respectively. Core/shell structures were also found to be very efficient for in vitro MFH on cancer cell line. About 95% cell death was occurred in 90min after hyperthermia treatment. The mechanism of cell death was found to be elevated ROS generation in cells after exposure to core/shells in external magnetic field. This study showed that these core/shells have a great potential to be used in in vivo MFH. [Display omitted] •MNPs were studied for colloidal stability in physiological media and human serum.•MNPs showed high SAR in human serum also.•MNPs show negligible cytotoxicity to L929 and HeLa cell lines.•In vitro hyperthermia application of OA–BTH–Fe3O4 nanoparticles•Cell death mechanism was found to be ROS generation.