Oscillating magnet array-based nanomagnetic gene transfection of human mesenchymal stem cells

Abstract

Aim: In this work, the potential of nanomagnetic transfection of primary human mesenchymal stem cells (hMSCs) and the effects of a novel nonviral oscillating magnet array system in enhancing transfection efficiency were investigated. Materials & methods: Green fluorescent protein plasmids coupled to magnetic nanoparticles (MNPs) were introduced onto hMSCs in culture. Magnetic fields generated by arrays of neodymium iron boron magnets positioned below the culture plates direct the MNP/DNA complexes into contact with the cells. The magnet arrays were oscillated, promoting more efficient endocytosis via mechanical stimulation. Green fluorescent protein expression, cell viability and stem cell surface markers were assayed. Results: MNP/DNA complexes were delivered into hMSCs, and the oscillating magnet array system appears to improve transfection efficiency as well as cell viability. The expression of hMSC-specific cell surface markers was unaffected. Conclusion: Nonviral transfection using MNPs and oscillating magnet arrays offers a more efficient and ‘cell-friendly’ method of transfecting hMSCs than other nonviral techniques, while preserving their stem cell characteristics. Original submitted 8 March 2012; Revised submitted 12 February 2013