Quantitative Characterization of the Regulation of Iron Metabolism in Glioblastoma Stem-Like Cells using Magnetophoresis

Kyoung-Joo Jenny Park, James Kim, Thomas Testoff, Joseph Adams, Miranda Poklar, Maciej Zborowski, Monica Venere, Jeffrey J Chalmers
Biotechnology and Bioengineering 2019 March 24
This study focuses on different iron regulation mechanisms of glioblastoma (GBM) cancer stem-like cells (CSCs) and non-stem tumor cells (NSTCs) using multiple approaches: cell viability, density and magnetophoresis. GBM CSCs and NSTCs were exposed to elevated iron concentration, and their magnetic susceptibility was measured using Single Cell Magnetophoresis (SCM), which tracks the magnetic and settling velocities of thousands of individual cells passing through the magnetic field with a constant energy gradient. Our results consistently demonstrate that GBM NSTCs have higher magnetic susceptibility distribution at increased iron concentration compared to CSCs, and we speculate that it is because CSCs have the ability to store a high amount of iron in ferritin, whereas the free iron ions inside the NSTCs lead to higher magnetic susceptibility and reduced cell viability and growth. Further, their difference in magnetic susceptibility has led us to pursue a separation experiment using a Quadrupole magnetic separator (QMS), a novel microfluidic device that uses a concentric channel and permanent magnets in special configuration to separate samples based on their magnetic susceptibilities. GBM CSCs and NSTCs were exposed to elevated iron concentration, stained with two different trackers, mixed and introduced into QMS; subsequently, the separated fractions were analyzed by fluorescent microscopy. The separation results portray a successful label-less magnetic separation of the two populations. This article is protected by copyright. All rights reserved.

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