Absence of cytotoxicity towards microglia of iron oxide (α-Fe2O3) nanorhombohedra

Lewis, Crystal S.; Torres, Luisa; Miyauchi, Jeremy T.; Rastegar, Cyrus; Patete, Jonathan M.; Smith, Jacqueline M.; Wong, Stanislaus S.; Tsirka, Stella E.

doi:10.1039/c5tx00421g

Title: Absence of cytotoxicity towards microglia of iron oxide (α-Fe2O3) nanorhombohedra

Journal Article · Fri Feb 26 00:00:00 EST 2016 · Toxicology Research (Online)

DOI:https://doi.org/10.1039/c5tx00421g· OSTI ID:1603375

Lewis, Crystal S. ^[1]; Torres, Luisa ^[2]; Miyauchi, Jeremy T. ^[2]; Rastegar, Cyrus ^[2]; Patete, Jonathan M. ^[1]; Smith, Jacqueline M. ^[1]; Wong, Stanislaus S. ^[3]; Tsirka, Stella E. ^[2]

Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, USA
Department of Pharmacological Sciences, State University of New York at Stony Brook, Stony Brook, New York 11794-8651, USA
Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, USA, Condensed Matter Physics and Materials Science Department, Building 480, Brookhaven National Laboratory, Upton, New York 11973, USA

Understanding the nature of interactions between nanomaterials, such as commercially ubiquitous hematite (α-Fe₂O₃) nanorhombohedra (N-Rhomb) and biological systems is of critical importance for gaining insight into the practical applicability of nanomaterials. Microglia represent the first line of defense in the central nervous system (CNS) during severe injury or disease such as Parkinson's and Alzheimer's disease as illustrative examples. Hence, to analyze the potential cytotoxic effect of N-Rhomb exposure in the presence of microglia, we have synthesized Rhodamine B (RhB)-labeled α-Fe₂O₃ N-Rhomb, with lengths of 47 ± 10 nm and widths of 35 ± 8 nm. Internalization of RhB-labeled α-Fe₂O₃ N-Rhomb by microglia in the mouse brain was observed, and a dose-dependent increase in the cellular iron content as probed by cellular fluorescence was detected in cultured microglia after nanoparticle exposure. The cells maintained clear functional viability, exhibiting little to no cytotoxic effects after 24 and 48 hours at acceptable, physiological concentrations. Importantly, the nanoparticle exposure did not induce microglial cells to produce either tumor necrosis factor alpha (TNFα) or interleukin 1-beta (IL1β), two pro-inflammatory cytokines, nor did exposure stimulate the production of nitrites and reactive oxygen species (ROS), which are common indicators for the onset of inflammation. Finally, we propose that under the conditions of our experiments, i.e. in the presence of RhB labeled-α-Fe₂O₃ N-Rhomb maintaining concentrations of up to 100 μg mL–1 after 48 hours of incubation, the in vitro and in vivo internalization of RhB-labeled α-Fe₂O₃ N-Rhomb are likely to be clathrin-dependent, which represents a conventional mechanistic uptake route for most cells. Furthermore, given the crucial role that microglia play in many neurological disorders, understanding the potential cytotoxic effects of these nanostructures is of fundamental importance if they are to be used in a therapeutic setting.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC-00112704; SC00112704

OSTI ID:: 1603375

Alternate ID(s):: OSTI ID: 1240707

Report Number(s):: BNL-111876-2016-JA

Journal Information:: Toxicology Research (Online), Journal Name: Toxicology Research (Online) Vol. 5 Journal Issue: 3; ISSN 2045-4538

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 7 works

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Title: Absence of cytotoxicity towards microglia of iron oxide (α-Fe2O3) nanorhombohedra

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