In silico and in vitro study of magnetic niosomes for gene delivery: The effect of ergosterol and cholesterol.

A low transfection efficiency and failure to deliver therapeutic genes to target organs limit the use of vesicular systems in gene therapy. In this study, magnetic niosomes were used to improve transfection efficiency and overcome limitations. In this light, Tween 60 and Span 60 molecules were employed as the bilayer component and ergosterol and/or cholesterol as membrane-stabilizing agents. We studied the structural and dynamical properties of cholesterol-containing niosomes (ST60/Chol) and ergosterol-containing vesicles (ST60/Ergo) using the molecular dynamics (MD) simulation technique. In in vitro experiments, the protamine-condensed DNA along with magnetic nanoparticles were prepared and incorporated into the niosome to form magnetic niosome-entrapped protamine-condensed DNA (M-NPD). The MD simulation comparison of two bilayers showed that the ST60/Ergo vesicles have better properties for gene delivery. Our in vitro results confirmed the in silico results and revealed that Ergo-niosomes have smaller size, better polydispersity, and slower release of plasmid than Chol-niosome. Moreover, M-NPD-Ergo showed higher cellular uptake and gene expresssion in HEK-293T cell line compared to M-NPD-Chol vesicles.