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The Importance of Selecting a Proper Biological Milieu for Protein Corona Analysis in Vitro: Human Plasma Versus Human Serum Publisher Pubmed



Mirshafiee V1 ; Kim R1 ; Mahmoudi M2, 3, 4 ; Kraft ML1, 5, 6
Authors
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Authors Affiliations
  1. 1. Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, 61801, IL, United States
  2. 2. Division of Cardiovascular Medicine, Department of Medicine, Stanford University, School of Medicine, Stanford, 94305, CA, United States
  3. 3. Cardiovascular Institute, Department of Medicine, Stanford University, School of Medicine, Stanford, 94305, CA, United States
  4. 4. Nanotechnology Research Center, Department of Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
  5. 5. Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, 61801, IL, United States
  6. 6. Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, 61801, IL, United States

Source: International Journal of Biochemistry and Cell Biology Published:2016


Abstract

Nanoparticle (NP) exposure to biological fluids in the body results in protein binding to the NP surface, which forms a protein coating that is called the protein corona. To simplify studies of protein-NP interactions and protein corona formation, NPs are incubated with biological solutions, such as human serum or human plasma, and the effects of this exposure are characterized in vitro. Yet, how NP exposure to these two different biological milieus affects protein corona composition and cell response has not been investigated. Here, we explore the differences between the protein coronas that form when NPs are incubated in human serum versus human plasma. NP characterization indicated that NPs that were exposed to human plasma had higher amounts of proteins bound to their surfaces, and were slightly larger in size than those exposed to human serum. In addition, significant differences in corona composition were also detected with gel electrophoresis and liquid chromatography-mass spectrometry/mass spectrometry, where a higher fraction of coagulation proteins and complement factors were found on the plasma-exposed NPs. Flow cytometry and confocal microscopy showed that the uptake of plasma-exposed NPs was higher than that of serum-exposed NPs by RAW 264.7 macrophage immune cells, but not by NIH 3T3 fibroblast cells. This difference is likely due to the elevated amounts of opsonins, such as fibrinogen, on the surfaces of the NPs exposed to plasma, but not serum, because these components trigger NP internalization by immune cells. As the human plasma better mimics the composition of the in vivo environment, namely blood, in vitro protein corona studies should employ human plasma, and not human serum, so the biological phenomena that is observed is more similar to that occurring in vivo. © 2015 Elsevier Ltd.
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