Title: Intracellular Dynamics of Superparamagnetic Iron Oxide Nanoparticles for Magnetic Partical Imaging

Abstract

Superparamagnetic iron oxide nanoparticles (SPIONs) are a foundational platform for a variety of biomedical applications. Of particular interest is Magnetic Particle Imaging (MPI), which is a growing area of research and development due to its advantages including high resolution and sensitivity with positive contrast. There has been signicant work in the area of in vivo optimization of SPIONs for MPI as well as their biodistribution in and clearance from the body. However, little is known about the dynamics of SPIONs following cellular internalization which may limit their usefulness in a variety of potential imaging and treatment applications. This work shows a clear 20% decrease in magnetic performance of SPIONs, as observed by Magnetic Particle Spectroscopy (MPS), after internalization and systematic consideration of applicable factors that aect SPION signal generation, including microstructure, environment, and interparticle interactions. There is no observed change to SPION microstructure after internalization, and the surrounding environment plays little to no role in magnetic response for the SPIONs studied here. Interparticle interactions described by dipole-dipole coupling of SPIONs held close to one another after internalization are shown to be the dominant cause of decreased magnetic performance in cells. These conclusions were drawn from transmission electron microscopy (TEM) imagemore » analysis at relevant length scales, experimentally prepared and characterized SPIONs in varied environmental conditions, and theoretical modeling with Monte Carlo simulations.« less

Authors:

Teeman, Eric M. ^[1]; Shasha, Carolyn ^[2]; Evans, James E. ^[3]; Krishan, Kannan ^[2]

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+ Show Author Affiliations

1. UNIVERSITY OF WASHINGTON
2. University of Washington
3. BATTELLE (PACIFIC NW LAB)

Publication Date:

Sun Apr 28 00:00:00 EDT 2019

Research Org.:

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1530859

Report Number(s):

PNNL-SA-141236

DOE Contract Number:  

AC05-76RL01830

Resource Type:

Journal Article

Journal Name:

Nanoscale

Additional Journal Information:

Journal Volume: 11; Journal Issue: 16

Country of Publication:

United States

Language:

English