Journal
BIOMATERIALS
Volume 68, Issue -, Pages 77-88Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2015.07.049
Keywords
Janus particles; Protein corona; Nanotoxicity; Nanomedicine; In vivo imaging
Funding
- German Research Foundation (DFG) [HI-689/8-2]
- Stiftung Rheinland-Pfalz (NANOSCH)
- DFG [SFB 1066]
- Fonds der Chemischen Industrie VCI-Fellowship
- Excellence Initiative [DFG/GSC 266]
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Au@Fe3O4 Janus particles (JPs) are heteroparticles with discrete domains defined by different materials. Their tunable composition and morphology confer multimodal and versatile capabilities for use as contrast agents and drug carriers in future medicine. Au@Fe3O4 JPs have colloidal properties and surface characteristics leading to interactions with proteins in biological fluids. The resulting protein adsorption layer (protein corona) critically affects their interaction with living matter. Although Au@Fe3O4 JPs displayed good biocompatibility in a standardized in vitro situation, an in-depth characterization of the protein corona is of prime importance to unravel underlying mechanisms affecting their pathophysiology and biodistribution in vitro and in vivo. Here, we comparatively analyzed the human plasma corona of Au-thiol@Fe3O4-SiO2-PEG JPs (NH2-functionalized and non-functionalized) and spherical magnetite (Fe3O4-SiO2-PEG) particles and investigated its effects on colloidal stability, biocompatibility and cellular uptake. Label-free quantitative proteomic analyses revealed that complex coronas including almost 180 different proteins were formed within only one minute. Remarkably, in contrast to spherical magnetite particles with surface NH2 groups, the Janus structure prevented aggregation and the adhesion of op-sonins. This resulted in an enhanced biocompatibility of corona sheathed JPs compared to spherical magnetite particles and corona-free JPs. (C) 2015 The Authors. Published by Elsevier Ltd.
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