Fig. 1

Design and characterization of PEI@IONPs and corresponding magnetofection complexes systems. A Schematic illustration of synthesis process of magnetofection complexes systems (miR-PEI@IONPs) using polyethyleneimine (PEI)-coated iron oxide nanoparticles (IONPs) to deliver miRNAs. B–D Zeta potential (B), diameter (C) and morphology (D) of the PEI@IONPs. E Transmitting electron microscope images indicating the internalisation of IONPs by seed cells. The image on the right is a magnification of the marked box on the left. F Cell counting kit-8 results of seed cells treated with various conditions (IONPs concentration: 0, 10, 25, 50, 100 µg/mL and EMF intensity: 0, 1, 2 or 5 mT)