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Open AccessArticle

Capturing Amyloid-β Oligomers by Stirring with Microscaled Iron Oxide Stir Bars into Magnetic Plaques to Reduce Cytotoxicity toward Neuronal Cells

1
Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 30013, Taiwan
2
Department of Surgery, Hsinchu Mackay Memorial Hospital, Hsinchu 30071, Taiwan
3
Department of Surgery, China Medical University Hospital-Hsinchu Branch, Hsinchu 30059, Taiwan
4
Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(7), 1284; https://doi.org/10.3390/nano10071284
Received: 29 April 2020 / Revised: 24 June 2020 / Accepted: 28 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Magnetic Nanoparticle-Based Hyperthermia and Theranostics)
Soluble amyloid-β oligomers (oAβ42)-induced neuronal death and inflammation response has been recognized as one of the major causes of Alzheimer’s disease (AD). In this work, a novel strategy adopting silica-coated iron oxide stir bar (MSB)-based AD therapy system via magnetic stirring-induced capture of oAβ42 into magnetic plaques (mpAβ42) and activation of microglia on cellular plaque clearance was developed. With oAβ42 being effectively converted into mpAβ42, the neurotoxicity toward neuronal cells was thus greatly reduced. In addition to the good preservation of neurite outgrowth through the diminished uptake of oAβ42, neurons treated with oAβ42 under magnetic stirring also exhibited comparable neuron-specific protein expression to those in the absence of oAβ42. The phagocytic uptake of mpAβ42 by microglia was enhanced significantly as compared to the counterpart of oAβ42, and the M1 polarization of microglia often occurring after the uptake of oAβ42 restricted to an appreciable extent. As a result, the inflammation induced by pro-inflammatory cytokines was greatly alleviated. View Full-Text
Keywords: Alzheimer’s disease; amyloid beta-peptides; microglial cell polarization; microscaled stirring; magnetic stir bars Alzheimer’s disease; amyloid beta-peptides; microglial cell polarization; microscaled stirring; magnetic stir bars
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MDPI and ACS Style

Tsai, Y.-C.; Luo, J.-C.; Liu, T.-I.; Lu, I.-L.; Shen, M.-Y.; Chuang, C.-Y.; Chern, C.-S.; Chiu, H.-C. Capturing Amyloid-β Oligomers by Stirring with Microscaled Iron Oxide Stir Bars into Magnetic Plaques to Reduce Cytotoxicity toward Neuronal Cells. Nanomaterials 2020, 10, 1284.

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