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Takhsha M, Furlani F, Panseri S, Casoli F, Uhlíř V, Albertini F. Magnetic Shape-Memory Heuslers Turn to Bio: Cytocompatibility of Ni-Mn-Ga Films and Biomedical Perspective. ACS APPLIED BIO MATERIALS 2023; 6:5009-5017. [PMID: 37887071 DOI: 10.1021/acsabm.3c00691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Magnetic shape-memory (MSM) Heuslers have attracted great attention in recent years for both caloric and magnetomechanical applications. Thanks to their multifunctional properties, they are also promising for a vast variety of biomedical applications. However, this topic has been rarely investigated so far. In this communication, we present the first report on the absence of cytotoxicity of MSM Heuslers in Ni-Mn-Ga epitaxial thin films and the perspective toward bioapplications. Qualitative and quantitative biological characterizations reveal that Ni-Mn-Ga films can promote the adhesion and proliferation of human fibroblasts without eliciting any cytotoxic effect. Additionally, our findings show that the morphology, composition, microstructure, phase transformation, and magnetic characteristics of the films are well preserved after the biological treatments, making the material a promising candidate for further investigations.
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Affiliation(s)
- Milad Takhsha
- National Research Council of Italy - Institute of Materials for Electronics and Magnetism (IMEM-CNR), Parco area delle scienze 37/A, 43124 Parma, PR, Italy
| | - Franco Furlani
- National Research Council of Italy - Institute of Science, Technology and Sustainability for Ceramics (ISSMC-CNR), Via Granarolo 64, 48018 Faenza, RA, Italy
| | - Silvia Panseri
- National Research Council of Italy - Institute of Science, Technology and Sustainability for Ceramics (ISSMC-CNR), Via Granarolo 64, 48018 Faenza, RA, Italy
| | - Francesca Casoli
- National Research Council of Italy - Institute of Materials for Electronics and Magnetism (IMEM-CNR), Parco area delle scienze 37/A, 43124 Parma, PR, Italy
| | - Vojtěch Uhlíř
- Central European Institute of Technology, Brno University of Technology (CEITEC BUT), Purkyňova 123, 61 200 Brno, Czech Republic
- Institute of Physical Engineering, Brno University of Technology, Technická 2, 61669 Brno, Czech Republic
| | - Franca Albertini
- National Research Council of Italy - Institute of Materials for Electronics and Magnetism (IMEM-CNR), Parco area delle scienze 37/A, 43124 Parma, PR, Italy
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Motyčková L, Arregi JA, Staňo M, Průša S, Částková K, Uhlíř V. Preserving Metamagnetism in Self-Assembled FeRh Nanomagnets. ACS APPLIED MATERIALS & INTERFACES 2023; 15:8653-8665. [PMID: 36720004 PMCID: PMC10016751 DOI: 10.1021/acsami.2c20107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 01/18/2023] [Indexed: 05/26/2023]
Abstract
Preparing and exploiting phase-change materials in the nanoscale form is an ongoing challenge for advanced material research. A common lasting obstacle is preserving the desired functionality present in the bulk form. Here, we present self-assembly routes of metamagnetic FeRh nanoislands with tunable sizes and shapes. While the phase transition between antiferromagnetic and ferromagnetic orders is largely suppressed in nanoislands formed on oxide substrates via thermodynamic nucleation, we find that nanomagnet arrays formed through solid-state dewetting keep their metamagnetic character. This behavior is strongly dependent on the resulting crystal faceting of the nanoislands, which is characteristic of each assembly route. Comparing the calculated surface energies for each magnetic phase of the nanoislands reveals that metamagnetism can be suppressed or allowed by specific geometrical configurations of the facets. Furthermore, we find that spatial confinement leads to very pronounced supercooling and the absence of phase separation in the nanoislands. Finally, the supported nanomagnets are chemically etched away from the substrates to inspect the phase transition properties of self-standing nanoparticles. We demonstrate that solid-state dewetting is a feasible and scalable way to obtain supported and free-standing FeRh nanomagnets with preserved metamagnetism.
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Affiliation(s)
- Lucie Motyčková
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
| | - Jon Ander Arregi
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
| | - Michal Staňo
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
| | - Stanislav Průša
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
- Institute
of Physical Engineering, Brno University
of Technology, Technická
2, 616 69Brno, Czech Republic
| | - Klára Částková
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
- Department
of Ceramics and Polymers, Brno University
of Technology, Technická
2, 616 69Brno, Czech Republic
| | - Vojtěch Uhlíř
- CEITEC
BUT, Brno University of Technology, Purkyňova 123, 612 00Brno, Czech Republic
- Institute
of Physical Engineering, Brno University
of Technology, Technická
2, 616 69Brno, Czech Republic
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Liu L, Dodd S, Hunt RD, Pothayee N, Atanasijevic T, Bouraoud N, Maric D, Moseman EA, Gossa S, McGavern DB, Koretsky AP. Early detection of cerebrovascular pathology and protective antiviral immunity by MRI. eLife 2022; 11:74462. [PMID: 35510986 PMCID: PMC9106335 DOI: 10.7554/elife.74462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Accepted: 05/05/2022] [Indexed: 11/13/2022] Open
Abstract
Central nervous system (CNS) infections are a major cause of human morbidity and mortality worldwide. Even patients that survive CNS infections can have lasting neurological dysfunction resulting from immune and pathogen induced pathology. Developing approaches to noninvasively track pathology and immunity in the infected CNS is crucial for patient management and development of new therapeutics. Here, we develop novel MRI-based approaches to monitor virus-specific CD8+ T cells and their relationship to cerebrovascular pathology in the living brain. We studied a relevant murine model in which a neurotropic virus (vesicular stomatitis virus) was introduced intranasally and then entered the brain via olfactory sensory neurons - a route exploited by many pathogens in humans. Using T2*-weighted high-resolution MRI, we identified small cerebral microbleeds as an early form of pathology associated with viral entry into the brain. Mechanistically, these microbleeds occurred in the absence of peripheral immune cells and were associated with infection of vascular endothelial cells. We monitored the adaptive response to this infection by developing methods to iron label and track individual virus specific CD8+ T cells by MRI. Transferred antiviral T cells were detected in the brain within a day of infection and were able to reduce cerebral microbleeds. These data demonstrate the utility of MRI in detecting the earliest pathological events in the virally infected CNS as well as the therapeutic potential of antiviral T cells in mitigating this pathology.
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Affiliation(s)
- Li Liu
- Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, Bethesda, United States
| | - Steve Dodd
- Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, Bethesda, United States
| | - Ryan D Hunt
- Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, Bethesda, United States
| | - Nikorn Pothayee
- Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, Bethesda, United States
| | - Tatjana Atanasijevic
- Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, Bethesda, United States
| | - Nadia Bouraoud
- Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, Bethesda, United States
| | - Dragan Maric
- Flow and Imaging Cytometry Core Facility, National Institute of Neurological Disorders and Stroke, Bethesda, United States
| | - E Ashley Moseman
- Department of Immunology, Duke University School of Medicine, Durham, United States
| | - Selamawit Gossa
- Viral Immunology and Intravital Imaging Section, National Institute of Neurological Disorders and Stroke, Bethesda, United States
| | - Dorian B McGavern
- Viral Immunology and Intravital Imaging Section, National Institute of Neurological Disorders and Stroke, Bethesda, United States
| | - Alan P Koretsky
- Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, Bethesda, United States
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