Probing of the Assembly Structure and Dynamics within Nanoparticles during Interaction with Blood Proteins (original) (raw)

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ArticleOctober 30, 2012

Probing of the Assembly Structure and Dynamics within Nanoparticles during Interaction with Blood Proteins

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Published October 30, 2012

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Copyright © 2012 American Chemical Society

Abstract

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Fully understanding the influence of blood proteins on the assembly structure and dynamics within nanoparticles is difficult because of the complexity of the system and the difficulty in probing the diverse elements and milieus involved. Here we show the use of site-specific labeling with spin probes and fluorophores combined with electron paramagnetic resonance (EPR) spectroscopy and fluorescence resonance energy transfer (FRET) measurements to provide insights into the molecular architecture and dynamics within nanoparticles. These tools are especially useful for determining nanoparticle stability in the context of blood proteins and lipoproteins and have allowed us to quantitatively analyze the dynamic changes in assembly structure, local stability, and cargo diffusion of a class of novel telodendrimer-based micellar nanoparticles. When combined with human plasma and individual plasma components, we find that non-cross-linked nanoparticles immediately lose their original assembly structure and release their payload upon interaction with lipoproteins. In contrast, serum albumins and immunoglobulin gamma have moderate affects on the integrity of the nanoparticles. Disulfide cross-linked nanoparticles show minimal interaction with lipoproteins and can better retain their assembly structure and payload in vitro and in vivo. We further demonstrate how the enhanced stability and release property of disulfide cross-linked nanoparticles can be reversed in reductive conditions. These findings identify factors that are crucial to the performance of nanomedicines and provide design modes to control their interplay with blood factors.

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Supplementary methods, synthesis and characterizations of nanoparticles, stability of nanoparticles, and additional EPR and FRET data. This material is available free of charge via the Internet at http://pubs.acs.org.

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ACS Nano

Cite this: ACS Nano 2012, 6, 11

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Published October 30, 2012

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