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Bruthans J, Jiráková K. The Current State and Usage of European Electronic Cross-border Health Services (eHDSI). J Med Syst 2023; 47:21. [PMID: 36773082 PMCID: PMC9918835 DOI: 10.1007/s10916-023-01920-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 02/08/2023] [Indexed: 02/12/2023]
Abstract
INTRODUCTION European Union intends to enable cross-border health services through a program referred to as "MyHealth@EU". The first main service is the dispensation of medicine by interlinking national electronic prescription systems. The second one is the Patient Summary, which enables providing the basic set of patients' medical data. METHODS The contemporary technical documentation of the project was studied and selected published Key Performance Indicators of the project were analyzed. Where necessary, data were acquired directly from the European Commission. RESULTS Data from the start of the project (fourth quarter of 2019) until the second quarter of 2022 were analyzed. During this time both the overall number of EU countries with operational cross-border healthcare and their particular abilities in both services have risen. At present, there are eleven countries with capabilities in at least one of the services, of which nine have reported transactions. More countries are in the test phase now and will join the operational phase of the project shortly. DISCUSSION AND CONCLUSION Nevertheless, the program is still used mostly for testing purposes. It seems that only electronic prescription and dispensation are commonly and widely used so far and only Estonian and Finnish patients usually get their medication dispensed abroad. The rest of the operational countries is still at present missing country pairs with a strong cross-border use case.
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Affiliation(s)
- Jan Bruthans
- Department of Biomedical Technology, Faculty of Biomedical Engineering, Czech Technical University in Prague, 272 01, Kladno, Czech Republic.
- Department of Anesthesiology and Intensive Care, General Teaching Hospital, Prague, Czech Republic.
| | - Klára Jiráková
- Information Technology Department, Regional Authority of Vysočina Region, Jihlava, Czech Republic
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2
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Kostiv U, Natile MM, Jirák D, Půlpánová D, Jiráková K, Vosmanská M, Horák D. PEG-Neridronate-Modified NaYF 4:Gd 3+,Yb 3+,Tm 3+/NaGdF 4 Core-Shell Upconverting Nanoparticles for Bimodal Magnetic Resonance/Optical Luminescence Imaging. ACS Omega 2021; 6:14420-14429. [PMID: 34124464 PMCID: PMC8190901 DOI: 10.1021/acsomega.1c01313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 05/05/2021] [Indexed: 05/04/2023]
Abstract
Upconverting nanoparticles are attracting extensive interest as a multimodal imaging tool. In this work, we report on the synthesis and characterization of gadolinium-enriched upconverting nanoparticles for bimodal magnetic resonance and optical luminescence imaging. NaYF4:Gd3+,Yb3+,Tm3+ core upconverting nanoparticles were obtained by a thermal coprecipitation of lanthanide oleate precursors in the presence of oleic acid as a stabilizer. With the aim of improving the upconversion emission and increasing the amount of Gd3+ ions on the nanoparticle surface, a 2.5 nm NaGdF4 shell was grown by the epitaxial layer-by-layer strategy, resulting in the 26 nm core-shell nanoparticles. Both core and core-shell nanoparticles were coated with poly(ethylene glycol) (PEG)-neridronate (PEG-Ner) to have stable and well-dispersed upconverting nanoparticles in a biological medium. FTIR spectroscopy and thermogravimetric analysis indicated the presence of ∼20 wt % of PEG-Ner on the nanoparticle surface. The addition of inert NaGdF4 shell resulted in a total 26-fold enhancement of the emission under 980 nm excitation and also affected the T 1 and T 2 relaxation times. Both r 1 and r 2 relaxivities of PEG-Ner-modified nanoparticles were much higher compared to those of non-PEGylated particles, thus manifesting their potential as a diagnostic tool for magnetic resonance imaging. Together with the enhanced luminescence efficiency, upconverting nanoparticles might represent an efficient probe for bimodal in vitro and in vivo imaging of cells in regenerative medicine, drug delivery, and/or photodynamic therapy.
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Affiliation(s)
- Uliana Kostiv
- Department
of Polymer Particles, Institute of Macromolecular
Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, Prague 6, Prague 162 06, Czech Republic
| | - Marta Maria Natile
- Institute
of Condensed Matter Chemistry and Technologies for Energy, National
Research Council (CNR) and Department of Chemical Sciences, University of Padova, via F. Marzolo 1, Padova 35131, Italy
| | - Daniel Jirák
- Radiodiagnostic
and Interventional Radiology Department, Institute for Clinical and Experimental Medicine, Vídeňská 1958/9, Prague 4, Prague 140 21, Czech Republic
- Faculty
of Health Studies, Technical University
of Liberec, Studentská
1402/2, Liberec 461 17, Czech Republic
| | - Denisa Půlpánová
- Faculty
of Health Studies, Technical University
of Liberec, Studentská
1402/2, Liberec 461 17, Czech Republic
| | - Klára Jiráková
- Department
of Histology and Embryology, Third Faculty of Medicine, Charles University, Ruská 87, Prague 10, Prague 100 00, Czech Republic
| | - Magda Vosmanská
- University
of Chemistry and Technology Prague, Technická 5, Prague 6, Prague 166 28, Czech Republic
| | - Daniel Horák
- Department
of Polymer Particles, Institute of Macromolecular
Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, Prague 6, Prague 162 06, Czech Republic
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Andrýsková P, Šišková KM, Michetschlägerová Š, Jiráková K, Kubala M, Jirák D. The Effect of Fatty Acids and BSA Purity on Synthesis and Properties of Fluorescent Gold Nanoclusters. Nanomaterials (Basel) 2020; 10:E343. [PMID: 32079332 PMCID: PMC7075172 DOI: 10.3390/nano10020343] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 01/31/2020] [Accepted: 02/09/2020] [Indexed: 12/25/2022]
Abstract
Fluorescent gold nanoclusters (AuNCs) are envisaged as a novel type of fluorophores. This work reports on the first comparative study investigating the effect of presence/absence/abundance of fatty acids (namely palmitic acid, PA) or other substances (like glycoproteins and globulins) in the protein (bovine serum albumin, BSA) on synthesis and properties of the final AuNCs. The most popular template (BSA) and microwave (MW)-assisted synthesis of AuNCs have been intentionally chosen. Our results clearly demonstrate that the fluorescent characteristics (i.e., fluorescence lifetime and quantum yield) are affected by the fatty acids and/or other substances. Importantly, the as-prepared AuNCs are biocompatible, as determined by Alamar Blue assay performed on Hep G2 cell line.
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Affiliation(s)
- Pavlína Andrýsková
- Department of Biophysics, Faculty of Science, Palacký University Olomouc, 17. Listopadu 12, 771 46 Olomouc, Czech Republic;
| | - Karolína Machalová Šišková
- Department of Biophysics, Faculty of Science, Palacký University Olomouc, 17. Listopadu 12, 771 46 Olomouc, Czech Republic;
| | - Šárka Michetschlägerová
- Department of Science and Research, Faculty of Health Studies, Technical University of Liberec, Studentska 1402/2, 461 17 Liberec, Czech Republic; (Š.M.); (K.J.); (D.J.)
| | - Klára Jiráková
- Department of Science and Research, Faculty of Health Studies, Technical University of Liberec, Studentska 1402/2, 461 17 Liberec, Czech Republic; (Š.M.); (K.J.); (D.J.)
| | - Martin Kubala
- Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17. Listopadu 12, 771 46 Olomouc, Czech Republic;
| | - Daniel Jirák
- Department of Science and Research, Faculty of Health Studies, Technical University of Liberec, Studentska 1402/2, 461 17 Liberec, Czech Republic; (Š.M.); (K.J.); (D.J.)
- Institute for Clinical and Experimental Medicine, Videnska 9, 140 21 Prague, Czech Republic
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Výborný K, Vallová J, Kočí Z, Kekulová K, Jiráková K, Jendelová P, Hodan J, Kubinová Š. Genipin and EDC crosslinking of extracellular matrix hydrogel derived from human umbilical cord for neural tissue repair. Sci Rep 2019; 9:10674. [PMID: 31337821 PMCID: PMC6650505 DOI: 10.1038/s41598-019-47059-x] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 07/03/2019] [Indexed: 12/23/2022] Open
Abstract
Extracellular matrix (ECM) hydrogels, produced by tissue decellularization are natural injectable materials suitable for neural tissue repair. However, the rapid biodegradation of these materials may disrupt neural tissue reconstruction in vivo. The aim of this study was to improve the stability of the previously described ECM hydrogel derived from human umbilical cord using genipin and N-(3-Dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride (EDC), crosslinking at concentration of 0.5-10 mM. The hydrogels, crosslinked by genipin (ECM/G) or EDC (ECM/D), were evaluated in vitro in terms of their mechanical properties, degradation stability and biocompatibility. ECM/G, unlike ECM/D, crosslinked hydrogels revealed improved rheological properties when compared to uncrosslinked ECM. Both ECM/G and ECM/D slowed down the gelation time and increased the resistance against in vitro enzymatic degradation, while genipin crosslinking was more effective than EDC. Crosslinkers concentration of 1 mM enhanced the in vitro bio-stability of both ECM/G and ECM/D without affecting mesenchymal stem cell proliferation, axonal sprouting or neural stem cell growth and differentiation. Moreover, when injected into cortical photochemical lesion, genipin allowed in situ gelation and improved the retention of ECM for up to 2 weeks without any adverse tissue response or enhanced inflammatory reaction. In summary, we demonstrated that genipin, rather than EDC, improved the bio-stability of injectable ECM hydrogel in biocompatible concentration, and that ECM/G has potential as a scaffold for neural tissue application.
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Affiliation(s)
- Karel Výborný
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czech Republic.,2nd Medical Faculty, Charles University, Prague, Czech Republic
| | - Jana Vallová
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czech Republic.,2nd Medical Faculty, Charles University, Prague, Czech Republic
| | - Zuzana Kočí
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czech Republic
| | - Kristýna Kekulová
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czech Republic.,2nd Medical Faculty, Charles University, Prague, Czech Republic
| | - Klára Jiráková
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czech Republic
| | - Pavla Jendelová
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czech Republic
| | - Jiří Hodan
- Institute of Macromolecular Chemistry of the Czech Academy of Sciences, Prague, Czech Republic
| | - Šárka Kubinová
- Institute of Experimental Medicine of the Czech Academy of Sciences, Prague, Czech Republic.
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Jiráková K, Moskvin M, Machová Urdzíková L, Rössner P, Elzeinová F, Chudíčková M, Jirák D, Ziolkowska N, Horák D, Kubinová Š, Jendelová P. The negative effect of magnetic nanoparticles with ascorbic acid on peritoneal macrophages. Neurochem Res 2019; 45:159-170. [PMID: 30945145 DOI: 10.1007/s11064-019-02790-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 03/26/2019] [Accepted: 03/28/2019] [Indexed: 12/14/2022]
Abstract
Superparamagnetic iron oxide nanoparticles (SPIOn) are widely used as a contrast agent for cell labeling. Macrophages are the first line of defense of organisms in contact with nanoparticles after their administration. In this study we investigated the effect of silica-coated nanoparticles (γ-Fe2O3-SiO2) with or without modification by an ascorbic acid (γ-Fe2O3-SiO2-ASA), which is meant to act as an antioxidative agent on rat peritoneal macrophages. Both types of nanoparticles were phagocytosed by macrophages in large amounts as confirmed by transmission electron microscopy and Prusian blue staining, however they did not substantially affect the viability of exposed cells in monitored intervals. We further explored cytotoxic effects related to oxidative stress, which is frequently documented in cells exposed to nanoparticles. Our analysis of double strand breaks (DSBs) marker γH2AX showed an increased number of DSBs in cells treated with nanoparticles. Nanoparticle exposure further revealed only slight changes in the expression of genes involved in oxidative stress response. Lipid peroxidation, another marker of oxidative stress, was not significantly affirmed after nanoparticle exposure. Our data indicate that the effect of both types of nanoparticles on cell viability, or biomolecules such as DNA or lipids, was similar; however the presence of ascorbic acid, either bound to the nanoparticles or added to the cultivation medium, worsened the negative effect of nanoparticles in various tests performed. The attachment of ascorbic acid on the surface of nanoparticles did not have a protective effect against induced cytotoxicity, as expected.
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Affiliation(s)
- Klára Jiráková
- Department of Neuroregeneration, Institute of Experimental Medicine, Czech Academy of Sciences, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Maksym Moskvin
- Department of Polymer Particles, Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czech Republic
| | - Lucia Machová Urdzíková
- Department of Neuroregeneration, Institute of Experimental Medicine, Czech Academy of Sciences, Vídeňská 1083, 142 20, Prague 4, Czech Republic
| | - Pavel Rössner
- Department of Genetic Toxicology and Nanotoxicology, Institute of Experimental Medicine, Czech Academy of Sciences, Prague, Czech Republic
| | - Fatima Elzeinová
- Department of Genetic Toxicology and Nanotoxicology, Institute of Experimental Medicine, Czech Academy of Sciences, Prague, Czech Republic
| | - Milada Chudíčková
- Department of Biomaterials and Biophysical Methods, Institute of Experimental Medicine, Czech Academy of Sciences, Prague, Czech Republic
| | - Daniel Jirák
- MR-Unit, Radiodiagnostic and Interventional Radiology Department, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - Natalia Ziolkowska
- MR-Unit, Radiodiagnostic and Interventional Radiology Department, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - Daniel Horák
- Department of Polymer Particles, Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague, Czech Republic
| | - Šárka Kubinová
- Department of Biomaterials and Biophysical Methods, Institute of Experimental Medicine, Czech Academy of Sciences, Prague, Czech Republic
| | - Pavla Jendelová
- Department of Neuroregeneration, Institute of Experimental Medicine, Czech Academy of Sciences, Vídeňská 1083, 142 20, Prague 4, Czech Republic. .,Department of Neuroscience, Second Faculty of Medicine, Charles University, Prague, Czech Republic.
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Kočí Z, Výborný K, Dubišová J, Vacková I, Jäger A, Lunov O, Jiráková K, Kubinová Š. Extracellular Matrix Hydrogel Derived from Human Umbilical Cord as a Scaffold for Neural Tissue Repair and Its Comparison with Extracellular Matrix from Porcine Tissues. Tissue Eng Part C Methods 2017; 23:333-345. [PMID: 28471271 DOI: 10.1089/ten.tec.2017.0089] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Extracellular matrix (ECM) hydrogels prepared by tissue decellularization have been reported as natural injectable materials suitable for neural tissue repair. In this study, we prepared ECM hydrogel derived from human umbilical cord (UC) and evaluated its composition and mechanical and biological properties in comparison with the previously described ECM hydrogels derived from porcine urinary bladder (UB), brain, and spinal cord. The ECM hydrogels did not differ from each other in the concentration of collagen, while the highest content of glycosaminoglycans as well as the shortest gelation time was found for UC-ECM. The elastic modulus was then found to be the highest for UB-ECM. In spite of a different origin, topography, and composition, all ECM hydrogels similarly promoted the migration of human mesenchymal stem cells (MSCs) and differentiation of neural stem cells, as well as axonal outgrowth in vitro. However, only UC-ECM significantly improved proliferation of tissue-specific UC-derived MSCs when compared with the other ECMs. Injection of UC-ECM hydrogels into a photothrombotic cortical ischemic lesion in rats proved its in vivo gelation and infiltration with host macrophages. In summary, this study proposes UC-ECM hydrogel as an easily accessible biomaterial of human origin, which has the potential for neural as well as other soft tissue reconstruction.
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Affiliation(s)
- Zuzana Kočí
- 1 Institute of Experimental Medicine , Academy of Sciences of the Czech Republic, Prague, Czech Republic .,2 Second Medical Faculty, Charles University , Prague, Czech Republic
| | - Karel Výborný
- 1 Institute of Experimental Medicine , Academy of Sciences of the Czech Republic, Prague, Czech Republic .,2 Second Medical Faculty, Charles University , Prague, Czech Republic
| | - Jana Dubišová
- 1 Institute of Experimental Medicine , Academy of Sciences of the Czech Republic, Prague, Czech Republic .,2 Second Medical Faculty, Charles University , Prague, Czech Republic
| | - Irena Vacková
- 1 Institute of Experimental Medicine , Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Aleš Jäger
- 3 Institute of Physics , Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Oleg Lunov
- 3 Institute of Physics , Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Klára Jiráková
- 1 Institute of Experimental Medicine , Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Šárka Kubinová
- 1 Institute of Experimental Medicine , Academy of Sciences of the Czech Republic, Prague, Czech Republic
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Jiráková K, Šeneklová M, Jirák D, Turnovcová K, Vosmanská M, Babič M, Horák D, Veverka P, Jendelová P. The effect of magnetic nanoparticles on neuronal differentiation of induced pluripotent stem cell-derived neural precursors. Int J Nanomedicine 2016; 11:6267-6281. [PMID: 27920532 PMCID: PMC5125991 DOI: 10.2147/ijn.s116171] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Introduction Magnetic resonance (MR) imaging is suitable for noninvasive long-term tracking. We labeled human induced pluripotent stem cell-derived neural precursors (iPSC-NPs) with two types of iron-based nanoparticles, silica-coated cobalt zinc ferrite nanoparticles (CZF) and poly-l-lysine-coated iron oxide superparamagnetic nanoparticles (PLL-coated γ-Fe2O3) and studied their effect on proliferation and neuronal differentiation. Materials and methods We investigated the effect of these two contrast agents on neural precursor cell proliferation and differentiation capability. We further defined the intracellular localization and labeling efficiency and analyzed labeled cells by MR. Results Cell proliferation was not affected by PLL-coated γ-Fe2O3 but was slowed down in cells labeled with CZF. Labeling efficiency, iron content and relaxation rates measured by MR were lower in cells labeled with CZF when compared to PLL-coated γ-Fe2O3. Cytoplasmic localization of both types of nanoparticles was confirmed by transmission electron microscopy. Flow cytometry and immunocytochemical analysis of specific markers expressed during neuronal differentiation did not show any significant differences between unlabeled cells or cells labeled with both magnetic nanoparticles. Conclusion Our results show that cells labeled with PLL-coated γ-Fe2O3 are suitable for MR detection, did not affect the differentiation potential of iPSC-NPs and are suitable for in vivo cell therapies in experimental models of central nervous system disorders.
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Affiliation(s)
- Klára Jiráková
- Department of Neuroscience, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic
| | - Monika Šeneklová
- Department of Neuroscience, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic; Department of Neuroscience, Second Faculty of Medicine, Charles University
| | - Daniel Jirák
- MR-Unit, Radiodiagnostic and Interventional Radiology Department, Institute for Clinical and Experimental Medicine; Department of Biophysics, Institute of Biophysics and Informatics, First Faculty of Medicine, Charles University
| | - Karolína Turnovcová
- Department of Neuroscience, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic
| | - Magda Vosmanská
- Department of Analytical Chemistry, University of Chemistry and Technology
| | - Michal Babič
- Department of Polymer Particles, Institute of Macromolecular Chemistry
| | - Daniel Horák
- Department of Polymer Particles, Institute of Macromolecular Chemistry
| | - Pavel Veverka
- Department of Magnetics and Superconductors, Institute of Physics, ASCR, Prague, Czech Republic
| | - Pavla Jendelová
- Department of Neuroscience, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic; Department of Neuroscience, Second Faculty of Medicine, Charles University
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Herynek V, Turnovcová K, Veverka P, Dědourková T, Žvátora P, Jendelová P, Gálisová A, Kosinová L, Jiráková K, Syková E. Using ferromagnetic nanoparticles with low Curie temperature for magnetic resonance imaging-guided thermoablation. Int J Nanomedicine 2016; 11:3801-11. [PMID: 27540292 PMCID: PMC4982507 DOI: 10.2147/ijn.s109582] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
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 (Tc) 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 (Tc =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 Tc 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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Affiliation(s)
- Vít Herynek
- MR-Unit, Radiodiagnostic and Interventional Radiology Department, Institute for Clinical and Experimental Medicine, Prague
| | | | - Pavel Veverka
- Department of Magnetics and Superconductors, Institute of Physics, Czech Academy of Sciences, Prague
| | - Tereza Dědourková
- Department of Inorganic Technology, Faculty of Chemical Technology, University of Pardubice; SYNPO, akciová společnost, Pardubice
| | - Pavel Žvátora
- Department of Analytical Chemistry, Institute of Chemical Technology
| | - Pavla Jendelová
- Department of Neuroscience, Institute of Experimental Medicine
| | - Andrea Gálisová
- MR-Unit, Radiodiagnostic and Interventional Radiology Department, Institute for Clinical and Experimental Medicine, Prague
| | - Lucie Kosinová
- Diabetes Center, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - Klára Jiráková
- Department of Neuroscience, Institute of Experimental Medicine
| | - Eva Syková
- Department of Neuroscience, Institute of Experimental Medicine
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Macková H, Plichta Z, Proks V, Kotelnikov I, Kučka J, Hlídková H, Horák D, Kubinová Š, Jiráková K. RGDS- and SIKVAVS-Modified Superporous Poly(2-hydroxyethyl methacrylate) Scaffolds for Tissue Engineering Applications. Macromol Biosci 2016; 16:1621-1631. [PMID: 27460202 DOI: 10.1002/mabi.201600159] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 06/24/2016] [Indexed: 12/22/2022]
Abstract
Three-dimensional hydrogel supports for mesenchymal and neural stem cells (NSCs) are promising materials for tissue engineering applications such as spinal cord repair. This study involves the preparation and characterization of superporous scaffolds based on a copolymer of 2-hydroxyethyl and 2-aminoethyl methacrylate (HEMA and AEMA) crosslinked with ethylene dimethacrylate. Ammonium oxalate is chosen as a suitable porogen because it consists of needle-like crystals, allowing their parallel arrangement in the polymerization mold. The amino group of AEMA is used to immobilize RGDS and SIKVAVS peptide sequences with an N-γ-maleimidobutyryloxy succinimide ester linker. The amount of the peptide on the scaffold is determined using 125 I radiolabeled SIKVAVS. Both RGDS- and SIKVAVS-modified poly(2-hydroxyethyl methacrylate) scaffolds serve as supports for culturing human mesenchymal stem cells (MSCs) and human fetal NSCs. The RGDS sequence is found to be better for MSC and NSC proliferation and growth than SIKVAVS.
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Affiliation(s)
- Hana Macková
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic
| | - Zdeněk Plichta
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic
| | - Vladimír Proks
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic
| | - Ilya Kotelnikov
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic
| | - Jan Kučka
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic
| | - Helena Hlídková
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic
| | - Daniel Horák
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic
| | - Šárka Kubinová
- Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Vídenˇská 1083, 14220, Prague 4, Czech Republic
| | - Klára Jiráková
- Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Vídenˇská 1083, 14220, Prague 4, Czech Republic
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Jiráková K, Kulda J, Nohýnková E. How nuclei of Giardia pass through cell differentiation: semi-open mitosis followed by nuclear interconnection. Protist 2011; 163:465-79. [PMID: 22209008 DOI: 10.1016/j.protis.2011.11.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Accepted: 11/10/2011] [Indexed: 12/30/2022]
Abstract
Differentiation into infectious cysts (encystation) and multiplication of pathogenic trophozoites after hatching from the cyst (excystation) are fundamental processes in the life cycle of the human intestinal parasite Giardia intestinalis. During encystation, a bi-nucleated trophozoite transforms to a dormant tetra-nucleated cyst enveloped by a protective cyst wall. Nuclear division during encystation is not followed by cytokinesis. In contrast to the well-studied mechanism of cyst wall formation, information on nuclei behavior is incomplete and basic cytological data are lacking. Here we present evidence that (1) the nuclei divide by semi-open mitosis during early encystment; (2) the daughter nuclei coming from different parent nuclei are always arranged in pairs; (3) in both pairs, the nuclei are interconnected via bridges formed by fusion of their nuclear envelopes; (4) each interconnected nuclear pair is associated with one basal body tetrad of the undivided diplomonad mastigont; and (5) the interconnection between nuclei persists through the cyst stage being a characteristic feature of encysted Giardia. Based on the presented results, a model of nuclei behavior during Giardia differentiation is proposed.
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Affiliation(s)
- Klára Jiráková
- Department of Tropical Medicine, 1(st) Faculty of Medicine, Charles University in Prague and Faculty Hospital Bulovka, Studnickova 7, Prague 2, 128 00, Czech Republic
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