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Voda P, Kremláček J, Kordek D, Chutná M, Bezrouk A. True pattern-reversal LED stimulator and its comparison to LCD and CRT displays: visual evoked potential study. Sci Rep 2024; 14:4244. [PMID: 38378903 PMCID: PMC10879535 DOI: 10.1038/s41598-024-54776-5] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 02/16/2024] [Indexed: 02/22/2024] Open
Abstract
A rapid checkerboard pattern change is used to elicit pattern-reversal visual evoked potentials (PR VEPs). CRT or LCD monitors do not allow immediate reversal of the entire pattern. The study aimed to construct a new stimulator whose characteristics approximate an instantaneous reversal and verify whether the improvement is reflected in PR VEPs. A new stimulator using a matrix of 12 × 48 independent white square LEDs was designed and compared with LCDs and CRTs. The effect on the PR VEP peak times and amplitudes of N70, P100, and P140 waves was evaluated in ten subjects. The LED stimulator showed significantly better performance in the rate of change of illuminance, change of pattern, luminance settling and stability. The PR VEP amplitudes of N75, P100, and N140 did not show significant differences. The sum of interpeak amplitudes was significantly larger for the LCD than for the other monitors. The peak times of the waves evoked by the LED were shorter than those evoked by the LCD and CRT for the N75 wave and a check size of 30´. LED stimulators are a better alternative to CRTs for PR VEPs than current LCDs. LEDs also seem to be better than CRTs, but further research is necessary to obtain significant results.
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Affiliation(s)
- P Voda
- Department of Medical Biophysics, Medical Faculty in Hradec Kralove, Charles University, Simkova 870, 500 03, Hradec Kralove, Czech Republic
| | - J Kremláček
- Department of Medical Biophysics, Medical Faculty in Hradec Kralove, Charles University, Simkova 870, 500 03, Hradec Kralove, Czech Republic.
| | - D Kordek
- Department of Medical Biophysics, Medical Faculty in Hradec Kralove, Charles University, Simkova 870, 500 03, Hradec Kralove, Czech Republic
| | - M Chutná
- Department of Pathological Physiology, Medical Faculty in Hradec Kralove, Charles University, Simkova 870, 500 03, Hradec Kralove, Czech Republic
| | - A Bezrouk
- Department of Medical Biophysics, Medical Faculty in Hradec Kralove, Charles University, Simkova 870, 500 03, Hradec Kralove, Czech Republic
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2
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Maseko TE, Elkalaf M, Peterová E, Lotková H, Staňková P, Melek J, Dušek J, Žádníková P, Čížková D, Bezrouk A, Pávek P, Červinková Z, Kučera O. Comparison of HepaRG and HepG2 cell lines to model mitochondrial respiratory adaptations in non‑alcoholic fatty liver disease. Int J Mol Med 2024; 53:18. [PMID: 38186319 PMCID: PMC10781417 DOI: 10.3892/ijmm.2023.5342] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 12/01/2023] [Indexed: 01/09/2024] Open
Abstract
Although some clinical studies have reported increased mitochondrial respiration in patients with fatty liver and early non‑alcoholic steatohepatitis (NASH), there is a lack of in vitro models of non‑alcoholic fatty liver disease (NAFLD) with similar findings. Despite being the most commonly used immortalized cell line for in vitro models of NAFLD, HepG2 cells exposed to free fatty acids (FFAs) exhibit a decreased mitochondrial respiration. On the other hand, the use of HepaRG cells to study mitochondrial respiratory changes following exposure to FFAs has not yet been fully explored. Therefore, the present study aimed to assess cellular energy metabolism, particularly mitochondrial respiration, and lipotoxicity in FFA‑treated HepaRG and HepG2 cells. HepaRG and HepG2 cells were exposed to FFAs, followed by comparative analyses that examained cellular metabolism, mitochondrial respiratory enzyme activities, mitochondrial morphology, lipotoxicity, the mRNA expression of selected genes and triacylglycerol (TAG) accumulation. FFAs stimulated mitochondrial respiration and glycolysis in HepaRG cells, but not in HepG2 cells. Stimulated complex I, II‑driven respiration and β‑oxidation were linked to increased complex I and II activities in FFA‑treated HepaRG cells, but not in FFA‑treated HepG2 cells. Exposure to FFAs disrupted mitochondrial morphology in both HepaRG and HepG2 cells. Lipotoxicity was induced to a greater extent in FFA‑treated HepaRG cells than in FFA‑treated HepG2 cells. TAG accumulation was less prominent in HepaRG cells than in HepG2 cells. On the whole, the present study demonstrates that stimulated mitochondrial respiration is associated with lipotoxicity in FFA‑treated HepaRG cells, but not in FFA‑treated HepG2 cells. These findings suggest that HepaRG cells are more suitable for assessing mitochondrial respiratory adaptations in the developed in vitro model of early‑stage NASH.
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Affiliation(s)
- Tumisang Edward Maseko
- Department of Physiology, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
| | - Moustafa Elkalaf
- Department of Physiology, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
| | - Eva Peterová
- Department of Physiology, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
- Department of Medical Biochemistry, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
| | - Halka Lotková
- Department of Physiology, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
| | - Pavla Staňková
- Department of Physiology, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
| | - Jan Melek
- Department of Physiology, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
| | - Jan Dušek
- Department of Physiology, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
- Department of Pharmacology and Toxicology, Charles University, Faculty of Pharmacy in Hradec Kralove, 500 05 Hradec Kralove, Czech Republic
| | - Petra Žádníková
- Department of Physiology, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
| | - Dana Čížková
- Department of Histology and Embryology Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
| | - Aleš Bezrouk
- Department of Medical Biophysics, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
| | - Petr Pávek
- Department of Pharmacology and Toxicology, Charles University, Faculty of Pharmacy in Hradec Kralove, 500 05 Hradec Kralove, Czech Republic
| | - Zuzana Červinková
- Department of Physiology, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
| | - Otto Kučera
- Department of Physiology, Charles University, Faculty of Medicine in Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
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Jandová M, Fišerová M, Paterová P, Cacková L, Měřička P, Malý J, Kacerovský M, Kovaříková E, Strohalm J, Demnerová K, Kadavá J, Sýkorová H, Hyšpler R, Čížková D, Bezrouk A, Houška M. High-Pressure Inactivation of Bacillus cereus in Human Breast Milk. Foods 2023; 12:4245. [PMID: 38231674 DOI: 10.3390/foods12234245] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/20/2023] [Accepted: 11/21/2023] [Indexed: 01/19/2024] Open
Abstract
Although Holder pasteurization is the recommended method for processing breast milk, it does affect some of its nutritional and biological properties and is ineffective at inactivating spores. The aim of this study was to find and validate an alternative methodology for processing breast milk to increase its availability for newborn babies and reduce the financial loss associated with discarding milk that has become microbiologically positive. We prepared two series of breast milk samples inoculated with the Bacillus cereus (B. cereus) strain to verify the effectiveness of two high-pressure treatments: (1) 350 MPa/5 min/38 °C in four cycles and (2) cumulative pressure of 350 MPa/20 min/38 °C. We found that the use of pressure in cycles was statistically more effective than cumulative pressure. It reduced the number of spores by three to four orders of magnitude. We verified that the method was reproducible. The routine use of this method could lead to an increased availability of milk for newborn babies, and at the same time, reduce the amount of wasted milk. In addition, high-pressure treatment preserves the nutritional quality of milk.
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Affiliation(s)
- Miroslava Jandová
- Tissue Bank, University Hospital Hradec Králové, 500 05 Hradec Králové, Czech Republic
- Department of Histology and Embryology, Faculty of Medicine in Hradec Králové, Charles University, 500 03 Hradec Králové, Czech Republic
| | - Michaela Fišerová
- Tissue Bank, University Hospital Hradec Králové, 500 05 Hradec Králové, Czech Republic
| | - Pavla Paterová
- Department of Clinical Microbiology, University Hospital and Faculty of Medicine in Hradec Králové, Charles University, 500 05 Hradec Králové, Czech Republic
| | - Lucie Cacková
- Department of Clinical Microbiology, University Hospital and Faculty of Medicine in Hradec Králové, Charles University, 500 05 Hradec Králové, Czech Republic
| | - Pavel Měřička
- Tissue Bank, University Hospital Hradec Králové, 500 05 Hradec Králové, Czech Republic
| | - Jan Malý
- Department of Pediatrics, University Hospital Hradec Králové, 500 05 Hradec Králové, Czech Republic
| | - Marian Kacerovský
- Biomedical Research Center, University Hospital Hradec Králové, 500 05 Hradec Králové, Czech Republic
| | | | - Jan Strohalm
- Food Research Institute Prague, 102 00 Prague, Czech Republic
| | - Kateřina Demnerová
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, 166 28 Prague, Czech Republic
| | - Jana Kadavá
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, 166 28 Prague, Czech Republic
| | - Hana Sýkorová
- Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, 166 28 Prague, Czech Republic
| | - Radomír Hyšpler
- Department of Clinical Biochemistry and Diagnostics, University Hospital Hradec Králové, 500 05 Hradec Králové, Czech Republic
| | - Dana Čížková
- Department of Histology and Embryology, Faculty of Medicine in Hradec Králové, Charles University, 500 03 Hradec Králové, Czech Republic
| | - Aleš Bezrouk
- Department of Medical Biophysics, Faculty of Medicine in Hradec Králové, Charles University, 500 03 Hradec Králové, Czech Republic
| | - Milan Houška
- Food Research Institute Prague, 102 00 Prague, Czech Republic
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Almaas R, Atneosen-Åsegg M, Ytre-Arne ME, Melheim M, Sorte HS, Cízková D, Reims HM, Bezrouk A, Harrison SP, Strand J, Hermansen JU, Andersen SS, Eiklid KL, Mokrý J, Sullivan GJ, Stray-Pedersen A. Aagenaes syndrome/lymphedema cholestasis syndrome 1 is caused by a founder variant in the 5'-untranslated region of UNC45A. J Hepatol 2023; 79:945-954. [PMID: 37328071 DOI: 10.1016/j.jhep.2023.05.037] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 05/12/2023] [Accepted: 05/21/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND & AIMS Lymphedema cholestasis syndrome 1 or Aagenaes syndrome is a condition characterized by neonatal cholestasis, lymphedema, and giant cell hepatitis. The genetic background of this autosomal recessive disease was unknown up to now. METHODS A total of 26 patients with Aagenaes syndrome and 17 parents were investigated with whole-genome sequencing and/or Sanger sequencing. PCR and western blot analyses were used to assess levels of mRNA and protein, respectively. CRISPR/Cas9 was used to generate the variant in HEK293T cells. Light microscopy, transmission electron microscopy and immunohistochemistry for biliary transport proteins were performed in liver biopsies. RESULTS One specific variant (c.-98G>T) in the 5'-untranslated region of Unc-45 myosin chaperone A (UNC45A) was identified in all tested patients with Aagenaes syndrome. Nineteen were homozygous for the c.-98G>T variant and seven were compound heterozygous for the variant in the 5'-untranslated region and an exonic loss-of-function variant in UNC45A. Patients with Aagenaes syndrome exhibited lower expression of UNC45A mRNA and protein than controls, and this was reproduced in a CRISPR/Cas9-created cell model. Liver biopsies from the neonatal period demonstrated cholestasis, paucity of bile ducts and pronounced formation of multinucleated giant cells. Immunohistochemistry revealed mislocalization of the hepatobiliary transport proteins BSEP (bile salt export pump) and MRP2 (multidrug resistance-associated protein 2). CONCLUSIONS c.-98G>T in the 5'-untranslated region of UNC45A is the causative genetic variant in Aagenaes syndrome. IMPACT AND IMPLICATIONS The genetic background of Aagenaes syndrome, a disease presenting with cholestasis and lymphedema in childhood, was unknown until now. A variant in the 5'-untranslated region of the Unc-45 myosin chaperone A (UNC45A) was identified in all tested patients with Aagenaes syndrome, providing evidence of the genetic background of the disease. Identification of the genetic background provides a tool for diagnosis of patients with Aagenaes syndrome before lymphedema is evident.
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Affiliation(s)
- Runar Almaas
- Department of Pediatric Research, Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Pb 4950, Nydalen, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway; Department of Paediatrics, Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Pb 4950, Nydalen, Oslo, Norway; European Reference Network - Rare Liver.
| | | | - Mari Eknes Ytre-Arne
- Norwegian National Unit for Newborn Screening, Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Oslo, Norway
| | - Maria Melheim
- Department of Pediatric Research, Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Pb 4950, Nydalen, Oslo, Norway; European Reference Network - Rare Liver
| | - Hanne Sørmo Sorte
- Department of Medical Genetics, Oslo University Hospital, Oslo, Norway
| | - Dana Cízková
- Department of Histology and Embryology, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Henrik Mikael Reims
- European Reference Network - Rare Liver; Department of Pathology, Oslo University Hospital, Oslo, Norway
| | - Aleš Bezrouk
- Department of Medical Biophysics, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Sean Philip Harrison
- Department of Pediatric Research, Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Pb 4950, Nydalen, Oslo, Norway; European Reference Network - Rare Liver
| | - Janne Strand
- Norwegian National Unit for Newborn Screening, Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Oslo, Norway
| | - Johanne Uthus Hermansen
- Department of Pediatric Research, Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Pb 4950, Nydalen, Oslo, Norway
| | - Sofie Strøm Andersen
- Department of Pediatric Research, Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Pb 4950, Nydalen, Oslo, Norway
| | | | - Jaroslav Mokrý
- Department of Histology and Embryology, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Gareth John Sullivan
- Department of Pediatric Research, Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Pb 4950, Nydalen, Oslo, Norway; Institute of Clinical Medicine, University of Oslo, Oslo, Norway; European Reference Network - Rare Liver
| | - Asbjørg Stray-Pedersen
- European Reference Network - Rare Liver; Norwegian National Unit for Newborn Screening, Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Oslo, Norway
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Gemuh CV, Bezrouk A, Pérez R, Ayala C, Solich P, Horstkotte B. Solvent-assisted dispersive micro-solid phase extraction of bisphenols using iron(III) thenoyltrifluoroacetonate complex (Fe(TTA) 3) as a new nanostructured sorbent: a proof of concept. Anal Methods 2023; 15:2061-2072. [PMID: 36916662 DOI: 10.1039/d3ay00214d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
In this work, we describe for the first time the use of iron(III) thenoyltrifluoroacetonate complex (Fe(TTA)3) as a novel sorbent for solvent-assisted dispersive micro-solid phase extraction (SA-dμSPE) of bisphenols from water samples. The extraction procedure is based on the formation of nanoparticles in situ following the rapid injection of a methanolic solution of Fe(TTA)3 into the stirred aqueous sample. Herein, the synthesis of Fe(TTA)3 and study of the essential parameters of the preparative procedure are described. The optimized procedure allowed for efficient enrichment of bisphenols from various water samples, chosen as model contaminants and matrix, within 2.5 min. The sorbent was collected by centrifugation, dissolved in methanol, and injected to perform HPLC with spectrophotometric detection. The limits of detection and quantification obtained ranged from 1.0-3.1 and 3.1-7.5 μg L-1, respectively. Intraday and interday precisions of <7% relative standard deviation (RSD) and <8% RSD with analyte recoveries ranging between 70-117% (103.8% on average) were obtained for the analysis of river water, wastewater treatment plant effluent, and bottled water.
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Affiliation(s)
- Celestine Vubangsi Gemuh
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, 500 05 Hradec Králové, Czech Republic.
| | - Aleš Bezrouk
- Department of Medical Biophysics, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic
| | - Rocío Pérez
- Chemistry Department, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Caitlan Ayala
- Chemistry Department, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Petr Solich
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, 500 05 Hradec Králové, Czech Republic.
| | - Burkhard Horstkotte
- Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Akademika Heyrovského 1203, 500 05 Hradec Králové, Czech Republic.
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Šestáková B, Schröterová L, Bezrouk A, Čížková D, Elkalaf M, Havelek R, Rudolf E, Králová V. The Effect of Chronic Exposure of Graphene Nanoplates on the Viability and Motility of A549 Cells. Nanomaterials (Basel) 2022; 12:nano12122074. [PMID: 35745421 PMCID: PMC9227066 DOI: 10.3390/nano12122074] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 06/10/2022] [Accepted: 06/13/2022] [Indexed: 12/07/2022]
Abstract
Graphene and its derivatives are popular nanomaterials used worldwide in many technical fields and biomedical applications. Due to such massive use, their anticipated accumulation in the environment is inevitable, with a largely unknown chronic influence on living organisms. Although repeatedly tested in chronic in vivo studies, long-term cell culture experiments that explain the biological response to these nanomaterials are still scarce. In this study, we sought to evaluate the biological responses of established model A549 tumor cells exposed to a non-toxic dose of pristine graphene for eight weeks. Our results demonstrate that the viability of the A549 cells exposed to the tested graphene did not change as well as the rate of their growth and proliferation despite nanoplatelet accumulation inside the cells. In addition, while the enzymatic activity of mitochondrial dehydrogenases moderately increased in exposed cells, their overall mitochondrial damage along with energy production changes was also not detected. Conversely, chronic accumulation of graphene nanoplates in exposed cells was detected, as evidenced by electron microscopy associated with impaired cellular motility.
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Affiliation(s)
- Blanka Šestáková
- Department of Medical Biology and Genetics, Faculty of Medicine in Hradec Kralove, Charles University, Simkova 870, 500 03 Hradec Králové, Czech Republic; (B.Š.); (E.R.); (V.K.)
| | - Ladislava Schröterová
- Department of Medical Biology and Genetics, Faculty of Medicine in Hradec Kralove, Charles University, Simkova 870, 500 03 Hradec Králové, Czech Republic; (B.Š.); (E.R.); (V.K.)
- Correspondence: ; Tel.: +420-495-816-284
| | - Aleš Bezrouk
- Department of Medical Biophysics, Faculty of Medicine in Hradec Kralove, Charles University, Simkova 870, 500 03 Hradec Králové, Czech Republic;
| | - Dana Čížková
- Department of Histology and Embryology, Faculty of Medicine in Hradec Kralove, Charles University, Simkova 870, 500 03 Hradec Králové, Czech Republic;
| | - Moustafa Elkalaf
- Department of Physiology, Faculty of Medicine in Hradec Kralove, Charles University, Simkova 870, 500 03 Hradec Králové, Czech Republic;
| | - Radim Havelek
- Department of Medical Biochemistry, Faculty of Medicine in Hradec Kralove, Charles University, Simkova 870, 500 03 Hradec Králové, Czech Republic;
| | - Emil Rudolf
- Department of Medical Biology and Genetics, Faculty of Medicine in Hradec Kralove, Charles University, Simkova 870, 500 03 Hradec Králové, Czech Republic; (B.Š.); (E.R.); (V.K.)
| | - Věra Králová
- Department of Medical Biology and Genetics, Faculty of Medicine in Hradec Kralove, Charles University, Simkova 870, 500 03 Hradec Králové, Czech Republic; (B.Š.); (E.R.); (V.K.)
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Loskot J, Jezbera D, Zmrhalová ZO, Nalezinková M, Alferi D, Lelkes K, Voda P, Andrýs R, Fučíková AM, Hosszú T, Bezrouk A. A Complex In Vitro Degradation Study on Polydioxanone Biliary Stents during a Clinically Relevant Period with the Focus on Raman Spectroscopy Validation. Polymers (Basel) 2022; 14:polym14050938. [PMID: 35267761 PMCID: PMC8912347 DOI: 10.3390/polym14050938] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [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: 01/27/2022] [Revised: 02/18/2022] [Accepted: 02/23/2022] [Indexed: 02/06/2023] Open
Abstract
Biodegradable biliary stents are promising treatments for biliary benign stenoses. One of the materials considered for their production is polydioxanone (PPDX), which could exhibit a suitable degradation time for use in biodegradable stents. Proper material degradation characteristics, such as sufficient stiffness and disintegration resistance maintained for a clinically relevant period, are necessary to ensure stent safety and efficacy. The hydrolytic degradation of commercially available polydioxanone biliary stents (ELLA-CS, Hradec Králové, Czech Republic) in phosphate-buffered saline (PBS) was studied. During 9 weeks of degradation, structural, physical, and surface changes were monitored using Raman spectroscopy, differential scanning calorimetry, scanning electron microscopy, and tensile and torsion tests. It was found that the changes in mechanical properties are related to the increase in the ratio of amorphous to crystalline phase, the so-called amorphicity. Monitoring the amorphicity using Raman spectroscopy has proven to be an appropriate method to assess polydioxanone biliary stent degradation. At the 1732 cm−1 Raman peak, the normalized shoulder area is less than 9 cm−1 which indicates stent disintegration. The stent disintegration started after 9 weeks of degradation in PBS, which agrees with previous in vitro studies on polydioxanone materials as well as with in vivo studies on polydioxanone biliary stents.
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Affiliation(s)
- Jan Loskot
- Department of Physics, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic; (J.L.); (D.J.)
| | - Daniel Jezbera
- Department of Physics, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic; (J.L.); (D.J.)
| | - Zuzana Olmrová Zmrhalová
- Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, Studentska 95, 530 02 Pardubice, Czech Republic;
| | - Martina Nalezinková
- Department of Biology, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic; (M.N.); (A.M.F.)
| | - Dino Alferi
- Department of Medical Biophysics, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic; (D.A.); (K.L.); (P.V.)
| | - Krisztina Lelkes
- Department of Medical Biophysics, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic; (D.A.); (K.L.); (P.V.)
| | - Petr Voda
- Department of Medical Biophysics, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic; (D.A.); (K.L.); (P.V.)
| | - Rudolf Andrýs
- Department of Chemistry, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic;
| | - Alena Myslivcová Fučíková
- Department of Biology, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic; (M.N.); (A.M.F.)
| | - Tomáš Hosszú
- Department of Neurosurgery, Faculty of Medicine in Hradec Králové, Charles University, Sokolská 581, 500 05 Hradec Králové, Czech Republic;
- Department of Neurosurgery, University Hospital Hradec Králové, Sokolská 581, 500 05 Hradec Králové, Czech Republic
| | - Aleš Bezrouk
- Department of Medical Biophysics, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic; (D.A.); (K.L.); (P.V.)
- Correspondence:
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Smutný M, Kopeček M, Bezrouk A. An Investigation of the Accuracy and Reproducibility of 3D Printed Transparent Endodontic Blocks. Acta Med (Hradec Kralove, Czech Repub ) 2022; 65:59-65. [DOI: 10.14712/18059694.2022.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Due to a broad spectrum of endodontic rotary instruments on the market and no standardised protocol for comparing their mechanical properties, it can be challenging for clinician to choose proper instruments. In vitro studies using resin blocks with artificial canals can offer many valuable information because of their uniformity compared to studies performed on extracted teeth. To improve precision and reproducibility of artificial canals, 3D printing was used in this study to manufacture endodontic test block samples. 20 commercially available endodontic blocks Endo-Training-Bloc-J by Dentsply Sirona were tested. The mean values of the measured parameters were used for a 3D CAD model of their replicas. 20 copies of the endodontic training blocks were printed from acrylic resin (VeroClear-RGD810, Stratasys, Eden Prairie, USA) using the 3D printer Objet30 Pro (Stratasys, Eden Prairie, USA). The key dimensions of the commercial blocks and the 3D printed blocks were measured under and compared using t – test and Levene’s test for equality of variances. The profiles of the 3D printed artificial canals showed significantly lower dimensional variability when compared with the commercial blocks. 3D polyjet printing proved to be a precise and reproducible method for production of blocks for testing endodontic rotary instruments.
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Kopeček M, Záhora J, Bezrouk A. Contactless Measurement of Integrity of Silicone Coating on Self-Expandable Esophageal Nitinol Stents. Acta Medica (Hradec Kralove) 2022; 65:18-24. [PMID: 35793504 DOI: 10.14712/18059694.2022.11] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
OBJECTIVES A stent is a mesh tube inserted into a natural passage in the body to prevent disease induction. Self-expandable esophageal nitinol stents such as SX-ELLA Stent Esophageal HV (HV Stent Plus) can be indicated for palliation of malignant esophageal strictures, for the treatment of benign esophageal strictures that are refractory to standard therapy and for the treatment of esophago-respiratory fistulas. A silicone-stent coating is used for tumor in-growth prevention and esophago-respiratory fistula occlusion. The thickness of the stent and the overall integrity of the silicone coating of all wires indicate the overall mechanical properties of the esophageal stent and the resistance to external adverse events such as corrosion and mechanical and chemical resistance. METHODS The polymer multicomponent epoxy resin - a mixture of Epon and Durcupan - was used as a method for robust sample stabilization. A cutting system using a thin water beam with a powder (Blue Line) was chosen as the best variant to obtain 6 samples for both-sided measurement (10 measuring sides). The optical microscopic reflective light method was used to examine wire crossing points in the sections. Fifty values were measured on either sample side for the internal, external and mesh thickness of the silicone stent layer. The wire crossing points were selected so that the silicone layer structure could be clearly seen, and the wires approached each other most closely. Only approximately 4 to 8 crossing points in each section could be measured when applying this approach. The resolution of the microscope and calibration (based on the camera used) was 0.677 μm/pixel. RESULTS Additional data could be obtained on 8 planes. Two boundary samples were destroyed by the cutting process. Whole coating of the stent was around all mesh wires, especially in areas with higher mechanical stress (wire crossing). The minimum detectable and admissible value determined for all 3 measuring areas (internal, external, mesh) on the wire crossings was 6.77 μm, i.e., 10 pixels, based on the microscope resolution and manufacturer's methodology. The results were characterized by p < 0.001 for all 3 parameters. We tested opposite samples in each section to verify the section quality and data consistency. For the 4 areas, the data were significantly different, but the thickness differences were only on the order of units percent, so the measurements were not appreciably affected. We assume that the material cutting loss, making up 1-2 mm, contributed to the differences in the sections. CONCLUSION We examined the overall integrity of the silicone coating of the esophageal stent. The method of HV stent anchoring in a polymeric bath followed by cutting with a waterjet and sample measurement under an optical microscope proved to be very simple and reliable. Sufficient thicknesses of the silicone layer on the wire cross sections were verified. The coated silicone layer thickness appeared to be significantly different along the stent from the proximal part to the distant part, presumably due to the manufacturing technology.
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Affiliation(s)
- Martin Kopeček
- Department of Medical Biophysics, Charles University, Faculty of Medicine in Hradec Králové, Hradec Králové, Czech Republic.
| | - Jiří Záhora
- Department of Medical Biophysics, Charles University, Faculty of Medicine in Hradec Králové, Hradec Králové, Czech Republic
| | - Aleš Bezrouk
- Department of Medical Biophysics, Charles University, Faculty of Medicine in Hradec Králové, Hradec Králové, Czech Republic
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Loskot J, Jezbera D, Bezrouk A, Doležal R, Andrýs R, Francová V, Miškář D, Myslivcová Fučíková A. Raman Spectroscopy as a Novel Method for the Characterization of Polydioxanone Medical Stents Biodegradation. Materials (Basel) 2021; 14:ma14185462. [PMID: 34576686 PMCID: PMC8467320 DOI: 10.3390/ma14185462] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 09/17/2021] [Accepted: 09/17/2021] [Indexed: 12/24/2022]
Abstract
Polydioxanone (PPDX), as an FDA approved polymer in tissue engineering, is an important component of some promising medical devices, e.g., biodegradable stents. The hydrolytic degradation of polydioxanone stents plays a key role in the safety and efficacy of treatment. A new fast and convenient method to quantitatively evaluate the hydrolytic degradation of PPDX stent material was developed. PPDX esophageal stents were degraded in phosphate-buffered saline for 24 weeks. For the first time, the changes in Raman spectra during PPDX biodegradation have been investigated here. The level of PPDX hydrolytic degradation was determined from the Raman spectra by calculating the area under the 1732 cm-1 peak shoulder. Raman spectroscopy, unlike Fourier transform infrared (FT-IR) spectroscopy, is also sensitive enough to monitor the decrease in the dye content in the stents during the degradation. Observation by a scanning electron microscope showed gradually growing cracks, eventually leading to the stent disintegration. The material crystallinity was increasing during the first 16 weeks, suggesting preferential degradation of the amorphous phase. Our results show a new easy and reliable way to evaluate the progression of PPDX hydrolytic degradation. The proposed approach can be useful for further studies on the behavior of PPDX materials, and for clinical practice.
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Affiliation(s)
- Jan Loskot
- Department of Physics, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic; (J.L.); (D.J.); (D.M.)
| | - Daniel Jezbera
- Department of Physics, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic; (J.L.); (D.J.); (D.M.)
| | - Aleš Bezrouk
- Department of Medical Biophysics, Faculty of Medicine in Hradec Králové, Charles University, 500 03 Hradec Králové, Czech Republic
- Correspondence:
| | - Rafael Doležal
- Department of Chemistry, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic; (R.D.); (R.A.)
| | - Rudolf Andrýs
- Department of Chemistry, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic; (R.D.); (R.A.)
| | - Vendula Francová
- ELLA-CS, s.r.o., Milady Horákové 504/45, 500 06 Hradec Králové, Czech Republic;
| | - Dominik Miškář
- Department of Physics, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic; (J.L.); (D.J.); (D.M.)
| | - Alena Myslivcová Fučíková
- Department of Biology, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic;
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Kubeček O, Laco J, Špaček J, Kubečková A, Petera J, Krulichová IS, Bezrouk A, Filip S, Kopecký J. Clinicopathological Characteristics and Prognostic Factors in Ovarian Metastases from Right- and Left-Sided Colorectal Cancer. ACTA ACUST UNITED AC 2021; 28:2914-2927. [PMID: 34436021 PMCID: PMC8395391 DOI: 10.3390/curroncol28040255] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 07/18/2021] [Accepted: 07/30/2021] [Indexed: 11/16/2022]
Abstract
BACKGROUND Secondary tumors of the ovary (STOs) account for 10-25% of all ovarian malignancies, including metastases from primary gynecological tumors. Colorectal cancer (CRC) has been recognized as one of the most common causes of STOs in Western countries. Despite it being well-known that CRC originating from the right versus left side of the colon/rectum differ substantially, there is a paucity of information regarding the effect of the primary tumor sidedness on the clinicopathological characteristics of STOs. METHODS This retrospective, observational chart review study included patients with histologically confirmed STOs of CRC origin diagnosed between January 2000 and December 2019. The clinicopathological characteristics of STOs originating from left-sided and right-sided CRC were compared. Univariable and multivariable analyses employing elastic net Cox proportional hazard models were used to evaluate potential prognostic factors. Further, the role of imaging methods in STOs diagnostics was evaluated. RESULTS Fifty-one patients with STOs of colorectal origin were identified. The primary tumor originated in the right and left colon/rectum in 39% and 61% of the cases, respectively. STOs originating from right-sided primary tumors were more frequently bilateral, associated with peritoneal carcinomatosis, had the ovarian surface affected by the tumor, and contained a mucinous component. The independent prognostic factors for overall survival in the whole cohort included: the presence of macroscopic residual disease after cytoreductive surgery, menopausal status, the application of systemic therapy, and the application of targeted therapy. In 54% of cases, the imaging methods failed to determine the laterality of the STOs correctly as compared to pathological reports and/or intraoperative findings. CONCLUSION STOs originating from left-sided and right-sided CRC show distinct clinicopathological characteristics. Moreover, different metastatic pathways might be employed according to the primary tumor sidedness. Considering the discrepancies between radiological assessment and histopathological findings regarding the laterality of STOs, bilateral adnexectomy should be advised whenever feasible.
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Affiliation(s)
- Ondřej Kubeček
- Department of Oncology and Radiotherapy, Faculty of Medicine and University Hospital in Hradec Králové, Charles University, Sokolská 581, 50005 Hradec Králové, Czech Republic; (O.K.); (J.P.); (S.F.)
| | - Jan Laco
- The Fingerland Department of Pathology, Faculty of Medicine and University Hospital in Hradec Králové, Charles University, Sokolská 581, 50005 Hradec Králové, Czech Republic;
| | - Jiří Špaček
- Department of Obstetrics and Gynecology, Faculty of Medicine and University Hospital in Hradec Králové, Charles University, Sokolská 581, 50005 Hradec Králové, Czech Republic;
| | - Alena Kubečková
- Department of Gynecology, First Private Surgical Center, Ltd., Sanus Hradec Králové, Labská kotlina I/1220, 50002 Hradec Králové, Czech Republic;
| | - Jiří Petera
- Department of Oncology and Radiotherapy, Faculty of Medicine and University Hospital in Hradec Králové, Charles University, Sokolská 581, 50005 Hradec Králové, Czech Republic; (O.K.); (J.P.); (S.F.)
| | - Iva Selke Krulichová
- Department of Medical Biophysics, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 50003 Hradec Králové, Czech Republic; (I.S.K.); (A.B.)
| | - Aleš Bezrouk
- Department of Medical Biophysics, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 50003 Hradec Králové, Czech Republic; (I.S.K.); (A.B.)
| | - Stanislav Filip
- Department of Oncology and Radiotherapy, Faculty of Medicine and University Hospital in Hradec Králové, Charles University, Sokolská 581, 50005 Hradec Králové, Czech Republic; (O.K.); (J.P.); (S.F.)
| | - Jindřich Kopecký
- Department of Oncology and Radiotherapy, Faculty of Medicine and University Hospital in Hradec Králové, Charles University, Sokolská 581, 50005 Hradec Králové, Czech Republic; (O.K.); (J.P.); (S.F.)
- Correspondence: ; Tel.: +420-495-832-176
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12
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Bezrouk A, Hosszú T, Falzon O, Voda P, Vachek M, Záhora J, Mašín V, Camilleri KP, Kremláček J. Digital orbitoplethysmograph: A new device to study the regional cerebral circulation using extraorbital plethysmography. J Neurosci Methods 2019; 329:108459. [PMID: 31614161 DOI: 10.1016/j.jneumeth.2019.108459] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 04/24/2019] [Revised: 10/07/2019] [Accepted: 10/07/2019] [Indexed: 10/25/2022]
Abstract
BACKGROUND Noninvasive diagnostic methods utilizing pulse wave measurements on the surface of the head are an important tool in diagnosing various types of cerebrovascular disease. The measurement of extraorbital pressure fluctuations reflects intraocular and intracranial pressure changes and can be used to estimate pressure changes in intracranial arteries and the collateral circulation. NEW METHOD In this paper, we describe our patented (CZ 305757) digital device for noninvasive measuring and monitoring of orbital movements using pressure detection. We conducted preclinical tests (126 measurements on 42 volunteers) to evaluate the practical capabilities of our device. Two human experts visually assessed the quality of the pressure pulsation and discriminability among various test conditions (specifically, subject lying, sitting, and the Matas carotid occlusion test). RESULTS The results showed that our device provided clinically relevant outcomes with a sufficient level of detail of the pulse wave and a high reliability (not less than 85%) in all clinically relevant situations. It was possible to record the effect of the Matas carotid occlusion test. COMPARISON WITH EXISTING METHOD(S) Our fully noninvasive, lightweight (185 g), portable, and wireless device provides a considerably cheaper alternative to the current diagnostic methods (e.g., transcranial ultrasound, X-ray, or MRI angiography) for specific assessment of cerebral circulation. Within a minute, it can detect the Willis circle integrity and thus eliminate the potential risks associated with the Matas test using standard EEG. CONCLUSIONS Our device represents an improvement and a valid alternative to the current methods diagnosing regional cerebral circulation.
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Affiliation(s)
- Aleš Bezrouk
- Department of Medical Biophysics, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic.
| | - Tomáš Hosszú
- Department of Neurosurgery, University hospital Hradec Kralove, Hradec Kralove, Czech Republic
| | - Owen Falzon
- Centre for Biomedical Cybernetics, University of Malta, Msida, Malta
| | - Petr Voda
- Department of Medical Biophysics, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Mikuláš Vachek
- Department of Neurosurgery, University hospital Hradec Kralove, Hradec Kralove, Czech Republic
| | - Jiří Záhora
- Department of Medical Biophysics, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Vladimír Mašín
- Department of Medical Biophysics, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Kenneth P Camilleri
- Department of Systems & Control Engineering, Faculty of Engineering, University of Malta, Msida, Malta
| | - Jan Kremláček
- Department of Pathological Physiology, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
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Filipová A, Diaz Garcia D, Bezrouk A, Čížková D, Dvořák J, Filip S, Sturge J, Šinkorová Z. The toxic effect of cytostatics on primary cilia frequency and multiciliation. J Cell Mol Med 2019; 23:5728-5736. [PMID: 31207084 PMCID: PMC6652919 DOI: 10.1111/jcmm.14487] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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] [Received: 03/04/2019] [Revised: 04/30/2019] [Accepted: 05/20/2019] [Indexed: 01/04/2023] Open
Abstract
The primary cilium is considered as a key component of morphological cellular stability. However, cancer cells are notorious for lacking primary cilia in most cases, depending upon the tumour type. Previous reports have shown the effect of starvation and cytostatics on ciliogenesis in normal and cancer cells although with limited success, especially when concerning the latter. In this study, we evaluated the presence and frequency of primary cilia in breast fibroblasts and in triple-negative breast cancer cells after treatment with cytostatics finding that, in the case of breast fibroblasts, primary cilia were detected at their highest incidence 72 hours after treatment with 120 nM doxorubicin. Further, multiciliated cells were also detected after treatment with 80 nM doxorubicin. On the other hand, treatment with taxol increased the number of ciliated cells only at low concentrations (1.25 and 3.25 nM) and did not induce multiciliation. Interestingly, triple-negative breast cancer cells did not present primary cilia after treatment with either doxorubicin or taxol. This is the first study reporting the presence of multiple primary cilia in breast fibroblasts induced by doxorubicin. However, the null effect of these cytostatics on primary cilia incidence in the evaluated triple negative breast carcinomas cell lines requires further research.
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Affiliation(s)
- Alžběta Filipová
- Department of Radiobiology, Faculty of Military Health Sciences in Hradec Králové, University of Defence, Hradec Králové, Czech Republic
| | - Daniel Diaz Garcia
- Department of Clinical Biochemistry and Diagnostics, University Hospital, Hradec Králové, Czech Republic
| | - Aleš Bezrouk
- Department of Medical Biophysics, Faculty of Medicine, Charles University, Hradec Králové, Czech Republic
| | - Dana Čížková
- Department of Histology and Embryology, Faculty of Medicine, Charles University, Hradec Králové, Czech Republic
| | - Josef Dvořák
- Department of Oncology, Thomayer Hospital, Charles University, Prague, Czech Republic
| | - Stanislav Filip
- Department of Oncology and Radiotherapy, Faculty of Medicine, Charles University, Hradec Králové, Czech Republic
| | - Justin Sturge
- Department of Biomedical Sciences, Faculty of Health Sciences, University of Hull, Hull, UK
| | - Zuzana Šinkorová
- Department of Radiobiology, Faculty of Military Health Sciences in Hradec Králové, University of Defence, Hradec Králové, Czech Republic
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Šponer P, Kučera T, Brtková J, Urban K, Kočí Z, Měřička P, Bezrouk A, Konrádová Š, Filipová A, Filip S. Comparative Study on the Application of Mesenchymal Stromal Cells Combined with Tricalcium Phosphate Scaffold into Femoral Bone Defects. Cell Transplant 2018; 27:1459-1468. [PMID: 30203687 PMCID: PMC6180724 DOI: 10.1177/0963689718794918] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 12/14/2022] Open
Abstract
This prospective study sought to evaluate the healing quality of implanted ultraporous β-tricalcium phosphate sown with expanded autologous mesenchymal stromal cells (MSCs) into femoral defects during revision hip arthroplasty. A total of 37 osseous defects in 37 patients were treated and evaluated concerning bone regeneration. Nineteen subjects received β-tricalcium phosphate graft material serving as a carrier of expanded autologous MSCs (the trial group A), nine subjects received β-tricalcium phosphate graft material only (the study group B) and nine subjects received cancellous allografts only (the control group C). Clinical and radiographic evaluations were scheduled at 6 weeks, 3, 6, and 12 months post-operatively, and performed at the most recent visit as well. All observed complications were recorded during follow-up to assess the use of an ultraporous β-tricalcium phosphate synthetic graft material combined with expanded MSCs in bone defect repair. The resulting data from participants with accomplished follow-up were processed and statistically evaluated with a Freeman–Halton modification of the Fischer’s exact test, a P < 0.05 value was considered to be significant. Whereas no significant difference was observed between the trial group A with β-tricalcium phosphate synthetic graft material serving as a carrier of expanded autologous MSCs and control group C with cancellous impaction allografting in terms of the bone defect healing, significant differences were documented between the study group B with β-tricalcium phosphate graft material only and control group C. Regarding adverse effects, six serious events were recorded during the clinical trial with no causal relationship to the cell product. β-tricalcium phosphate synthetic graft material serving as a carrier of expanded autologous MSCs appears safe and promotes the healing of bone defects in a jeopardized and/or impaired microenvironment. This clinical trial was registered at the EU Clinical Trials Register before patient recruitment (Registration number: EudraCT number 2012-005599-33; Date of registration: 2013-02-04).
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Affiliation(s)
- Pavel Šponer
- 1 Department of Orthopaedic Surgery, University Hospital, Hradec Králové, Czech Republic
| | - Tomáš Kučera
- 1 Department of Orthopaedic Surgery, University Hospital, Hradec Králové, Czech Republic
| | - Jindra Brtková
- 2 Department of Radiology, University Hospital, Hradec Králové, Czech Republic
| | - Karel Urban
- 1 Department of Orthopaedic Surgery, University Hospital, Hradec Králové, Czech Republic
| | - Zuzana Kočí
- 3 Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Pavel Měřička
- 4 Tissue Bank, University Hospital, Hradec Králové, Czech Republic
| | - Aleš Bezrouk
- 5 Department of Medical Biophysics, Charles University, Faculty of Medicine Hradec Králové, Czech Republic
| | - Šimona Konrádová
- 3 Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Alžběta Filipová
- 6 Department of Radiobiology, Faculty of Military Health Sciences in Hradec Králové, University of Defence in Brno, Czech Republic
| | - Stanislav Filip
- 7 Department of Oncology and Radiotherapy, Charles University, Faculty of Medicine Hradec Králové, Czech Republic
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Čížková D, Komárková Z, Bezrouk A, Macháčková L, Vávrová J, Filip S, Mokrý J. Bone Marrow-Derived Cells Participate in Composition of the Satellite Cell Niche in Intact and Regenerating Mouse Skeletal Muscle. Folia Biol (Praha) 2018; 64:155-166. [PMID: 30938672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The cellular components of the satellite cell niche participate in the regulation of skeletal muscle regeneration. Beside myogenic cells at different developmental stages, this niche is formed by cells of the immune system, the interstitial connective tissue and the vascular system. Unambiguous determination of the origin of these cell types could contribute to optimization of the cell-based therapy of skeletal muscle disorders. In our work, we intravenously transplanted mouse GFP+ unseparated bone marrow cells into whole-body lethally irradiated immunocompetent mice four weeks before cardiotoxin-induced injury of the recipients' skeletal muscles. Seven and 28 days after the toxin injection, the injured regenerating and contralateral intact muscles were examined for identification of GFP+ bone marrow-derived cells by direct fluorescence, protein immunohistochemistry and immunogold transmission electron microscopy. In both the intact and injured muscles, GFP positivity was determined in immune cells, mainly in macrophages, and in interstitial spindleshaped cells. Moreover, in the injured muscles, rare GFP+ endothelial cells of the blood vessels and newly formed myotubes and muscle fibres were present. Our results confirmed the ability of bone marrowderived cells to contribute to the cellular component of the satellite cell niche in the intact and regenerating skeletal muscle. These cells originated not only from haematopoietic stem cells, but obviously also from other stem or progenitor cells residing in the bone marrow, such as multipotent mesenchymal stromal cells and endothelial progenitors.
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Affiliation(s)
- D Čížková
- Department of Histology and Embryology, Faculty of Medicine in Hradec Králové, Charles University, Czech Republic
| | - Z Komárková
- Department of Histology and Embryology, Faculty of Medicine in Hradec Králové, Charles University, Czech Republic
| | - A Bezrouk
- Department of Medical Biophysics, Faculty of Medicine in Hradec Králové, Charles University, Czech Republic
| | - L Macháčková
- Department of Histology and Embryology, Faculty of Medicine in Hradec Králové, Charles University, Czech Republic
| | - J Vávrová
- Department of Radiobiology, Faculty of Military Health Sciences in Hradec Králové, University of Defence, Czech Republic
| | - S Filip
- Department of Oncology and Radiotherapy, Faculty of Medicine in Hradec Králové, Charles University, Czech Republic
| | - J Mokrý
- Department of Histology and Embryology, Faculty of Medicine in Hradec Králové, Charles University, Czech Republic
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Bezrouk A, Fiala Z, Kotingová L, Krulichová IS, Kopečná M, Vávrová K. SAMPA: A free software tool for skin and membrane permeation data analysis. Toxicol In Vitro 2017; 44:361-371. [PMID: 28746894 DOI: 10.1016/j.tiv.2017.07.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [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: 01/11/2017] [Accepted: 07/19/2017] [Indexed: 10/19/2022]
Abstract
Skin and membrane permeation experiments comprise an important step in the development of a transdermal or topical formulation or toxicological risk assessment. The standard method for analyzing these data relies on the linear part of a permeation profile. However, it is difficult to objectively determine when the profile becomes linear, or the experiment duration may be insufficient to reach a maximum or steady state. Here, we present a software tool for Skin And Membrane Permeation data Analysis, SAMPA, that is easy to use and overcomes several of these difficulties. The SAMPA method and software have been validated on in vitro and in vivo permeation data on human, pig and rat skin and model stratum corneum lipid membranes using compounds that range from highly lipophilic polycyclic aromatic hydrocarbons to highly hydrophilic antiviral drug, with and without two permeation enhancers. The SAMPA performance was compared with the standard method using a linear part of the permeation profile and a complex mathematical model. SAMPA is a user-friendly, open-source software tool for analyzing the data obtained from skin and membrane permeation experiments. It runs on a Microsoft Windows platform and is freely available as a Supporting file to this article.
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Affiliation(s)
- Aleš Bezrouk
- Department of Medical Biophysics, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic.
| | - Zdeněk Fiala
- Department of Hygiene and Preventive Medicine, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Lenka Kotingová
- Department of Hygiene and Preventive Medicine, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Iva Selke Krulichová
- Department of Medical Biophysics, Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic
| | - Monika Kopečná
- Skin Barrier Research Group, Faculty of Pharmacy, Charles University, Hradec Kralove, Czech Republic
| | - Kateřina Vávrová
- Skin Barrier Research Group, Faculty of Pharmacy, Charles University, Hradec Kralove, Czech Republic.
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Filipová A, Diaz-Garcia D, Bezrouk A, Čížková D, Havelek R, Vávrová J, Dayanithi G, Řezacová M. Ionizing radiation increases primary cilia incidence and induces multiciliation in C2C12 myoblasts. Cell Biol Int 2015; 39:943-53. [DOI: 10.1002/cbin.10462] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Accepted: 03/10/2015] [Indexed: 12/12/2022]
Affiliation(s)
- Alžběta Filipová
- Department of Medical Biochemistry; Faculty of Medicine, Charles University in Prague; Sokolská 581 500 05 Hradec Králové Czech Republic
| | - Daniel Diaz-Garcia
- Department of Histology and Embryology; Faculty of Medicine, Charles University in Prague; Hradec Králové Czech Republic
| | - Aleš Bezrouk
- Department of Medical Biophysics; Faculty of Medicine, Charles University in Prague; Hradec Králové Czech Republic
| | - Dana Čížková
- Department of Histology and Embryology; Faculty of Medicine, Charles University in Prague; Hradec Králové Czech Republic
| | - Radim Havelek
- Department of Medical Biochemistry; Faculty of Medicine, Charles University in Prague; Sokolská 581 500 05 Hradec Králové Czech Republic
| | - Jiřina Vávrová
- Department of Radiobiology, Faculty of Military Health Sciences; University of Defence; Hradec Králové Czech Republic
| | - Govindan Dayanithi
- Department of Molecular Neurophysiology, Institute of Experimental Medicine; Czech Academy of Sciences; Videnska 1083 142 20 Prague Czech Republic
- Institut National de la Santé et de la Recherche Médicale U1198; Université Montpellier; Montpellier France
- Ecole Pratique des Hautes Etudes-Sorbonne; Paris France
| | - Martina Řezacová
- Department of Medical Biochemistry; Faculty of Medicine, Charles University in Prague; Sokolská 581 500 05 Hradec Králové Czech Republic
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Abstract
The aim of this study was to analyze the possibilities of various types of stent modeling and to develop some new models. A brief survey of basic properties of stents and a list of basic designs of stents is presented. Two approaches to stent modeling were identified. Structural mechanics is the theoretical background of our analytical model of a spiral stent. The finite element method was also used. The measurement equipment for model evaluation was developed.
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Affiliation(s)
- J Záhora
- Department of Medical Biophysics, Faculty of Medicine, Charles University, Hradec Králové, Czech Republic.
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