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In our study, we chose three anisotropic geometries, star, rod, and triangle, to investigate the shape effect on cellular uptake into RAW264.7 cells.We fabricated gold nanostars (GNSs), gold nanorods (GNRs) and gold nanotriangles (GNTs) with similar size and coated them with methylpolyethylene glycol (m PEG) to obtain a neutral surface charge for excluding the interference of other factors (Fig. As is typically observed, m PEGylation allowed the GNPs to be well dispersed in aqueous solution and reduced the toxicity of the stabilizing agent CTAB. did evaluate the cellular uptake of GNPs by RAW264.7, but they did not investigate the endocytosis pathways. 2A–C, the GNPs exhibited distinct color variations.The size, shape, surface charge, and surface coating of nanoparticles all can affect their interactions with cells.Chan and coworkers demonstrated that the cellular uptake of GNPs was strongly size-dependent, with 50 nm nanoparticles showing the highest uptake by He La cells among a set of GNPs that ranged from 10 nm to 100 nm.The two surface plasmon resonance (SPR) peaks of GNSs were observed at 525 nm and 705 nm (Fig.2D), which corresponded to the transverse longitudinal plasmon resonance of the elongated tips. 2F, the GNTs had a major plasmon band at 635 nm corresponding to the in-plane band; the band at 575 nm was related to the byproducts of the gold nanoparticles.GNSs had neutral surface charge, whereas GNTs and GNRs were highly positively charged.They all possessed a neutral potential after modification with m PEG (Fig. Then we obtained the nanoparticles with similar sizes and surface potentials, as shown in Table 1.
In our study, we synthesized three different shapes of methylpolyethylene glycol coated-anisotropic gold nanoparticles: stars, rods, and triangles.The m PEG outer layer of m PEG coated gold nanoparticles (P-GNPs) can effectively prevent the adhesion of plasma proteins and subsequent phagocytosis by the immune system; this improves the circulation time of GNPs, RAW264.7 might be another cell model for the study of cellular uptake of GNPs. The color of GNSs, GNTs, and GNRs is in turn dark green, blue, and wine red.