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Using ferromagnetic nanoparticles with low Curie temperature for magnetic resonance imaging-guided thermoablation

V. Herynek, K. Turnovcová, P. Veverka, T. Dědourková, P. Žvátora, P. Jendelová, A. Gálisová, L. Kosinová, K. Jiráková, E. Syková,

. 2016 ; 11 (-) : 3801-11. [pub] 20160808

Jazyk angličtina Země Nový Zéland

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/bmc17013584

INTRODUCTION: Magnetic nanoparticles (NPs) represent a tool for use in magnetic resonance imaging (MRI)-guided thermoablation of tumors using an external high-frequency (HF) magnetic field. To avoid local overheating, perovskite NPs with a lower Curie temperature (T c) were proposed for use in thermotherapy. However, deposited power decreases when approaching the Curie temperature and consequently may not be sufficient for effective ablation. The goal of the study was to test this hypothesis. METHODS: Perovskite NPs (T c =66°C-74°C) were characterized and tested both in vitro and in vivo. In vitro, the cells suspended with NPs were exposed to a HF magnetic field together with control samples. In vivo, a NP suspension was injected into a induced tumor in rats. Distribution was checked by MRI and the rats were exposed to a HF field together with control animals. Apoptosis in the tissue was evaluated. RESULTS AND DISCUSSION: In vitro, the high concentration of suspended NPs caused an increase of the temperature in the cell sample, leading to cell death. In vivo, MRI confirmed distribution of the NPs in the tumor. The temperature in the tumor with injected NPs did not increase substantially in comparison with animals without particles during HF exposure. We proved that the deposited power from the NPs is too small and that thermoregulation of the animal is sufficient to conduct the heat away. Histology did not detect substantially higher apoptosis in NP-treated animals after ablation. CONCLUSION: Magnetic particles with low T c can be tracked in vivo by MRI and heated by a HF field. The particles are capable of inducing cell apoptosis in suspensions in vitro at high concentrations only. However, their effect in the case of extracellular deposition in vivo is questionable due to low deposited power and active thermoregulation of the tissue.

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$a INTRODUCTION: Magnetic nanoparticles (NPs) represent a tool for use in magnetic resonance imaging (MRI)-guided thermoablation of tumors using an external high-frequency (HF) magnetic field. To avoid local overheating, perovskite NPs with a lower Curie temperature (T c) were proposed for use in thermotherapy. However, deposited power decreases when approaching the Curie temperature and consequently may not be sufficient for effective ablation. The goal of the study was to test this hypothesis. METHODS: Perovskite NPs (T c =66°C-74°C) were characterized and tested both in vitro and in vivo. In vitro, the cells suspended with NPs were exposed to a HF magnetic field together with control samples. In vivo, a NP suspension was injected into a induced tumor in rats. Distribution was checked by MRI and the rats were exposed to a HF field together with control animals. Apoptosis in the tissue was evaluated. RESULTS AND DISCUSSION: In vitro, the high concentration of suspended NPs caused an increase of the temperature in the cell sample, leading to cell death. In vivo, MRI confirmed distribution of the NPs in the tumor. The temperature in the tumor with injected NPs did not increase substantially in comparison with animals without particles during HF exposure. We proved that the deposited power from the NPs is too small and that thermoregulation of the animal is sufficient to conduct the heat away. Histology did not detect substantially higher apoptosis in NP-treated animals after ablation. CONCLUSION: Magnetic particles with low T c can be tracked in vivo by MRI and heated by a HF field. The particles are capable of inducing cell apoptosis in suspensions in vitro at high concentrations only. However, their effect in the case of extracellular deposition in vivo is questionable due to low deposited power and active thermoregulation of the tissue.
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$a Turnovcová, Karolína $u Department of Neuroscience, Institute of Experimental Medicine.
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$a Veverka, Pavel $u Department of Magnetics and Superconductors, Institute of Physics, Czech Academy of Sciences, Prague.
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$a Dědourková, Tereza $u Department of Inorganic Technology, Faculty of Chemical Technology, University of Pardubice; SYNPO, akciová společnost, Pardubice.
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$a Žvátora, Pavel $u Department of Analytical Chemistry, Institute of Chemical Technology.
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$a Jendelová, Pavla $u Department of Neuroscience, Institute of Experimental Medicine.
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$a Gálisová, Andrea $u MR-Unit, Radiodiagnostic and Interventional Radiology Department, Institute for Clinical and Experimental Medicine, Prague.
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$a Kosinová, Lucie $u Diabetes Center, Institute for Clinical and Experimental Medicine, Prague, Czech Republic.
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$a Jiráková, Klára $u Department of Neuroscience, Institute of Experimental Medicine.
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$a Syková, Eva $u Department of Neuroscience, Institute of Experimental Medicine.
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