Effects of hydrophobic core components in amphiphilic PDMAEMA nanoparticles on siRNA delivery.

Effects of hydrophobic core components in amphiphilic PDMAEMA nanoparticles on siRNA delivery. Biomaterials. 2015 Apr;48:45-55 Authors: Han S, Cheng Q, Wu Y, Zhou J, Long X, Wei T, Huang Y, Zheng S, Zhang J, Deng L, Wang X, Liang XJ, Cao H, Liang Z, Dong A Abstract Due to their biodegradable character, polyesters such as polycaprolactone (PCL), poly(d,l-lactide) (PDLLA), and polylactic-co-glycolic acid (PLGA) were widely used as the hydrophobic cores of amphiphilic cationic nanoparticles (NPs) for siRNA delivery. However, fewer researches focused on facilitating siRNA delivery by adjusting the polyester composition of these nanoparticles. Herein, we investigated the contribution of polyester segments in siRNA delivery in vitro by introducing different ratio of DLLA moieties in PCL segments of mPEG-block-PCL-graft-poly(dimethylamino ethyl methacrylate)(PEG-b-PCL-g-PDMAEMA). It was noticed that compared with the other ratios of DLLA moieties, a certain molar ratio (about 70%) of the NPs, named mPEG45-P(CL21-co-DLLA48)-g-(PDMAEMA29)2 (PECLD-70), showed the highest gene knockdown efficiency but poorest cellular uptake ability in vitro. Further research revealed that NPs with various compositions of the polyester cores showed different physicochemical properties including particle size, zeta potential and stiffness, leading to different endocytosis mechanisms thus influencing the cellular uptake efficiency. Subsequently, we observed tha...
Source: Biomaterials - Category: Materials Science Authors: Tags: Biomaterials Source Type: research