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Weissová K, Fafílek B, Radaszkiewicz T, Celiker C, Macháčková P, Čechová T, Šebestíková J, Hampl A, Bryja V, Krejčí P, Bárta T. LuminoCell: a versatile and affordable platform for real-time monitoring of luciferase-based reporters. Life Sci Alliance 2022; 5:5/8/e202201421. [PMID: 35440493 PMCID: PMC9018015 DOI: 10.26508/lsa.202201421] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 04/08/2022] [Accepted: 04/08/2022] [Indexed: 11/24/2022] Open
Abstract
Luciferase reporter assays represent a simple and sensitive experimental system in cell and molecular biology to study multiple biological processes. However, the application of these assays is often limited by the costs of conventional luminometer instruments and the versatility of their use in different experimental conditions. Therefore, we aimed to develop a small, affordable luminometer allowing continuous measurement of luciferase activity, designed for inclusion into various kinds of tissue culture incubators. Here, we introduce LuminoCell-an open-source platform for the construction of an affordable, sensitive, and portable luminometer capable of real-time monitoring in-cell luciferase activity. The LuminoCell costs $40, requires less than 1 h to assemble, and it is capable of performing real-time sensitive detection of both magnitude and duration of the activity of major signalling pathways in cell cultures, including receptor tyrosine kinases (EGF and FGF), WNT/β-catenin, and NF-κB. In addition, we show that the LuminoCell is suitable to be used in cytotoxicity assays as well as for monitoring periodic circadian gene expression.
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Affiliation(s)
- Kamila Weissová
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Bohumil Fafílek
- Institute of Animal Physiology and Genetics of the Czech Academy of Sciences, Brno, Czech Republic.,Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.,International Clinical Research Center, St. Anne's University Hospital, Brno, Czech Republic
| | - Tomasz Radaszkiewicz
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Canan Celiker
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Petra Macháčková
- Cellular Imaging Core Facility, Central European Institute of Technology (CEITEC), Masaryk University, Brno, Czech Republic
| | - Tamara Čechová
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.,International Clinical Research Center, St. Anne's University Hospital, Brno, Czech Republic
| | - Jana Šebestíková
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.,Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Aleš Hampl
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.,International Clinical Research Center, St. Anne's University Hospital, Brno, Czech Republic
| | - Vítězslav Bryja
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Pavel Krejčí
- Institute of Animal Physiology and Genetics of the Czech Academy of Sciences, Brno, Czech Republic.,Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.,International Clinical Research Center, St. Anne's University Hospital, Brno, Czech Republic
| | - Tomáš Bárta
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic .,Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
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Radaszkiewicz T, Nosková M, Gömöryová K, Vondálová Blanářová O, Radaszkiewicz KA, Picková M, Víchová R, Gybeľ T, Kaiser K, Demková L, Kučerová L, Bárta T, Potěšil D, Zdráhal Z, Souček K, Bryja V. RNF43 inhibits WNT5A-driven signaling and suppresses melanoma invasion and resistance to the targeted therapy. eLife 2021; 10:65759. [PMID: 34702444 PMCID: PMC8550759 DOI: 10.7554/elife.65759] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [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] [Received: 12/14/2020] [Accepted: 09/28/2021] [Indexed: 12/30/2022] Open
Abstract
RNF43 is an E3 ubiquitin ligase and known negative regulator of WNT/β-catenin signaling. We demonstrate that RNF43 is also a regulator of noncanonical WNT5A-induced signaling in human cells. Analysis of the RNF43 interactome using BioID and immunoprecipitation showed that RNF43 can interact with the core receptor complex components dedicated to the noncanonical Wnt pathway such as ROR1, ROR2, VANGL1, and VANGL2. RNF43 triggers VANGL2 ubiquitination and proteasomal degradation and clathrin-dependent internalization of ROR1 receptor and inhibits ROR2 activation. These activities of RNF43 are physiologically relevant and block pro-metastatic WNT5A signaling in melanoma. RNF43 inhibits responses to WNT5A, which results in the suppression of invasive properties of melanoma cells. Furthermore, RNF43 prevented WNT5A-assisted development of resistance to BRAF V600E and MEK inhibitors. Next, RNF43 acted as melanoma suppressor and improved response to targeted therapies in vivo. In line with these findings, RNF43 expression decreases during melanoma progression and RNF43-low patients have a worse prognosis. We conclude that RNF43 is a newly discovered negative regulator of WNT5A-mediated biological responses that desensitizes cells to WNT5A.
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Affiliation(s)
- Tomasz Radaszkiewicz
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Michaela Nosková
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Kristína Gömöryová
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Olga Vondálová Blanářová
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | | | - Markéta Picková
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic.,Department of Cytokinetics, Institute of Biophysics CAS, Brno, Czech Republic.,International Clinical Research Center FNUSA-ICRC, Brno, Czech Republic
| | - Ráchel Víchová
- Department of Cytokinetics, Institute of Biophysics CAS, Brno, Czech Republic
| | - Tomáš Gybeľ
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Karol Kaiser
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Lucia Demková
- Laboratory of Molecular Oncology, Cancer Research Institute, Biomedical Research Center of the Slovak Academy of Sciences, Bratislava, Slovakia
| | - Lucia Kučerová
- Laboratory of Molecular Oncology, Cancer Research Institute, Biomedical Research Center of the Slovak Academy of Sciences, Bratislava, Slovakia
| | - Tomáš Bárta
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic.,Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - David Potěšil
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Zbyněk Zdráhal
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Karel Souček
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic.,Department of Cytokinetics, Institute of Biophysics CAS, Brno, Czech Republic.,International Clinical Research Center FNUSA-ICRC, Brno, Czech Republic
| | - Vítězslav Bryja
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic.,Department of Cytokinetics, Institute of Biophysics CAS, Brno, Czech Republic
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Jasenská D, Kašpárková V, Radaszkiewicz KA, Capáková Z, Pacherník J, Trchová M, Minařík A, Vajďák J, Bárta T, Stejskal J, Lehocký M, Truong TH, Moučka R, Humpolíček P. Conducting composite films based on chitosan or sodium hyaluronate. Properties and cytocompatibility with human induced pluripotent stem cells. Carbohydr Polym 2021; 253:117244. [PMID: 33278999 DOI: 10.1016/j.carbpol.2020.117244] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 04/09/2020] [Revised: 08/24/2020] [Accepted: 10/12/2020] [Indexed: 12/31/2022]
Abstract
Novel composite films combining biocompatible polysaccharides with conducting polyaniline (PANI) were prepared via the in-situ polymerization of aniline hydrochloride in the presence of sodium hyaluronate (SH) or chitosan (CH). The composite films possess very good cytocompatibility in terms of adhesion and proliferation of two lines of human induced pluripotent stem cells (hiPSC). Moreover, the cardiomyogenesis and even formation of beating clusters were successfully induced on the films. The proportion of formed cardiomyocytes demonstrated excellent properties of composites for tissue engineering of stimuli-responsive tissues. The testing also demonstrated antibacterial activity of the films against E. coli and PANI-SH was able to reduce bacterial growth from 2 × 105 to < 1 cfu cm-2. Physicochemical characterization revealed that the presence of polysaccharides did not notably influence conductivities of the composites being ∼1 and ∼2 S cm-1 for PANI-SH and PANI-CH respectively; however, in comparison with neat PANI, it modified their topography making the films smoother with mean surface roughness of 4 (PANI-SH) and 14 nm (PANI-CH). The combination of conductivity, antibacterial activity and mainly cytocompatibility with hiPSC opens wide application potential of these polysaccharide-based composites.
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Affiliation(s)
- Daniela Jasenská
- Centre of Polymer Systems and Faculty of Technology, Tomas Bata University in Zlin, 760 01 Zlin, Czech Republic.
| | - Věra Kašpárková
- Centre of Polymer Systems and Faculty of Technology, Tomas Bata University in Zlin, 760 01 Zlin, Czech Republic.
| | | | - Zdenka Capáková
- Centre of Polymer Systems and Faculty of Technology, Tomas Bata University in Zlin, 760 01 Zlin, Czech Republic.
| | - Jiří Pacherník
- Masaryk University, Faculty of Science, 625 00 Brno, Czech Republic.
| | - Miroslava Trchová
- University of Chemistry and Technology Prague, Central Laboratories, 166 28 Prague 6, Czech Republic.
| | - Antonín Minařík
- Centre of Polymer Systems and Faculty of Technology, Tomas Bata University in Zlin, 760 01 Zlin, Czech Republic.
| | - Jan Vajďák
- Centre of Polymer Systems and Faculty of Technology, Tomas Bata University in Zlin, 760 01 Zlin, Czech Republic.
| | - Tomáš Bárta
- Masaryk University, Faculty of Science, 625 00 Brno, Czech Republic.
| | - Jaroslav Stejskal
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic.
| | - Marián Lehocký
- Centre of Polymer Systems and Faculty of Technology, Tomas Bata University in Zlin, 760 01 Zlin, Czech Republic.
| | - Thanh Huong Truong
- Centre of Polymer Systems and Faculty of Technology, Tomas Bata University in Zlin, 760 01 Zlin, Czech Republic.
| | - Robert Moučka
- Centre of Polymer Systems and Faculty of Technology, Tomas Bata University in Zlin, 760 01 Zlin, Czech Republic.
| | - Petr Humpolíček
- Centre of Polymer Systems and Faculty of Technology, Tomas Bata University in Zlin, 760 01 Zlin, Czech Republic.
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Kolenatý D, Vlček J, Bárta T, Rezek J, Houška J, Haviar S. High-performance thermochromic VO 2-based coatings with a low transition temperature deposited on glass by a scalable technique. Sci Rep 2020; 10:11107. [PMID: 32632200 PMCID: PMC7338475 DOI: 10.1038/s41598-020-68002-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [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: 01/13/2020] [Accepted: 05/22/2020] [Indexed: 12/05/2022] Open
Abstract
We report on high-performance thermochromic ZrO2/V0.982W0.018O2/ZrO2 coatings with a low transition temperature prepared on glass by a low-temperature scalable deposition technique. The V0.982W0.018O2 layers were deposited by a controlled high-power impulse magnetron sputtering of V target, combined with a simultaneous pulsed DC magnetron sputtering of W target to reduce the transition temperature to 20–21 °C, at a low substrate surface temperature of 330 °C in an argon–oxygen gas mixture. ZrO2 antireflection layers both below and above the thermochromic V0.982W0.018O2 layers were deposited at a low substrate temperature (< 100 °C). A coating design utilizing a second-order interference in the ZrO2 layers was applied to increase both the luminous transmittance (Tlum) and the modulation of the solar transmittance (ΔTsol). The ZrO2/V0.982W0.018O2/ZrO2 coatings exhibit Tlum up to 60% at ΔTsol close to 6% for a V0.982W0.018O2 thickness of 45 nm, and Tlum up to 50% at ΔTsol above 10% for a V0.982W0.018O2 thickness of 69 nm.
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Affiliation(s)
- David Kolenatý
- Department of Physics and NTIS - European Centre of Excellence, University of West Bohemia, Univerzitní 8, 306 14, Plzeň, Czech Republic
| | - Jaroslav Vlček
- Department of Physics and NTIS - European Centre of Excellence, University of West Bohemia, Univerzitní 8, 306 14, Plzeň, Czech Republic.
| | - Tomáš Bárta
- Department of Physics and NTIS - European Centre of Excellence, University of West Bohemia, Univerzitní 8, 306 14, Plzeň, Czech Republic
| | - Jiří Rezek
- Department of Physics and NTIS - European Centre of Excellence, University of West Bohemia, Univerzitní 8, 306 14, Plzeň, Czech Republic
| | - Jiří Houška
- Department of Physics and NTIS - European Centre of Excellence, University of West Bohemia, Univerzitní 8, 306 14, Plzeň, Czech Republic
| | - Stanislav Haviar
- Department of Physics and NTIS - European Centre of Excellence, University of West Bohemia, Univerzitní 8, 306 14, Plzeň, Czech Republic
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Porokh V, Vaňhara P, Bárta T, Jurečková L, Bohačiaková D, Pospíšilová V, Mináriková D, Holubcová Z, Pelková V, Souček K, Hampl A. Soluble Cripto-1 Induces Accumulation of Supernumerary Centrosomes and Formation of Aberrant Mitoses in Human Embryonic Stem Cells. Stem Cells Dev 2018; 27:1077-1084. [PMID: 29882484 DOI: 10.1089/scd.2018.0017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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] [Indexed: 01/16/2023] Open
Abstract
Chromosomal instability evoked by abnormalities in centrosome numbers has been traditionally considered as a hallmark of aberrant, typically cancerous or senescent cells. We have reported previously that pristine human embryonic stem cells (hESC) suffer from high frequency of supernumerary centrosomes and hence may be prone to undergo abnormal mitotic divisions. We have also unraveled that this phenomenon of multicentrosomal mitoses vanishes with prolonged time in culture and with initiation of differentiation, and it is strongly affected by the culture substratum. In this study, we report for the first time that Cripto-1 protein (teratocarcinoma-derived growth factor 1, epidermal growth factor-Cripto/FRL-1/Cryptic) produced by hESC represents a factor capable of inducing formation of supernumerary centrosomes in cultured hESC. Elimination of Cripto-1 signaling on the other hand restores the normal number of centrosomes in hESC. Linking the secretory phenotype of hESC to the centrosomal metabolism may help to develop better strategies for propagation of stable and safe bioindustrial and clinical grade cultures of hESC. From a broader point of view, it may lead to unravelling Cripto-1 as a micro-environmental factor contributing to adverse cell behaviors in vivo.
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Affiliation(s)
- Volodymyr Porokh
- 1 Department of Histology and Embryology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
| | - Petr Vaňhara
- 1 Department of Histology and Embryology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
- 2 Center of Biomolecular and Cellular Engineering (CBCE), International Clinical Research Center, St. Anne's University Hospital, Brno, Czech Republic
| | - Tomáš Bárta
- 1 Department of Histology and Embryology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
| | - Lucie Jurečková
- 1 Department of Histology and Embryology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
| | - Dáša Bohačiaková
- 1 Department of Histology and Embryology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
| | - Veronika Pospíšilová
- 1 Department of Histology and Embryology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
| | - Daniela Mináriková
- 1 Department of Histology and Embryology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
| | - Zuzana Holubcová
- 1 Department of Histology and Embryology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
| | - Vendula Pelková
- 1 Department of Histology and Embryology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
| | - Karel Souček
- 2 Center of Biomolecular and Cellular Engineering (CBCE), International Clinical Research Center, St. Anne's University Hospital, Brno, Czech Republic
- 3 Department of Cytokinetics, Institute of Biophysics of the Czech Academy of Sciences, Brno, Czech Republic
| | - Aleš Hampl
- 1 Department of Histology and Embryology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
- 2 Center of Biomolecular and Cellular Engineering (CBCE), International Clinical Research Center, St. Anne's University Hospital, Brno, Czech Republic
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Janeček V, Andreotti B, Pražák D, Bárta T, Nikolayev VS. Moving contact line of a volatile fluid. Phys Rev E Stat Nonlin Soft Matter Phys 2013; 88:060404. [PMID: 24483373 DOI: 10.1103/physreve.88.060404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2012] [Indexed: 06/03/2023]
Abstract
Interfacial flows close to a moving contact line are inherently multiscale. The shape of the interface and the flow at meso- and macroscopic scales inherit an apparent interface slope and a regularization length, both named after Voinov, from the microscopic inner region. Here, we solve the inner problem associated with the contact line motion for a volatile fluid at equilibrium with its vapor. The evaporation or condensation flux is then controlled by the dependence of the saturation temperature on interface curvature-the so-called Kelvin effect. We derive the dependencies of the Voinov angle and of the Voinov length as functions of the parameters of the problem. We then identify the conditions under which the Kelvin effect is indeed the mechanism regularizing the contact line motion.
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Affiliation(s)
- V Janeček
- Physique et Mécanique des Milieux Hétérogènes, UMR 7636 ESPCI-CNRS-Université Paris-Diderot-Université P. M. Curie, 10 rue Vauquelin, 75005 Paris, France and ESEME, Service des Basses Températures, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, France
| | - B Andreotti
- Physique et Mécanique des Milieux Hétérogènes, UMR 7636 ESPCI-CNRS-Université Paris-Diderot-Université P. M. Curie, 10 rue Vauquelin, 75005 Paris, France
| | - D Pražák
- Department of Mathematical Analysis, Charles University, Sokolovska 83, 186 75, Prague, Czech Republic
| | - T Bárta
- Department of Mathematical Analysis, Charles University, Sokolovska 83, 186 75, Prague, Czech Republic
| | - V S Nikolayev
- Physique et Mécanique des Milieux Hétérogènes, UMR 7636 ESPCI-CNRS-Université Paris-Diderot-Université P. M. Curie, 10 rue Vauquelin, 75005 Paris, France and ESEME, Service des Basses Températures, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, France
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Krutá M, Bálek L, Hejnová R, Dobšáková Z, Eiselleová L, Matulka K, Bárta T, Fojtík P, Fajkus J, Hampl A, Dvořák P, Rotrekl V. Decrease in Abundance of Apurinic/Apyrimidinic Endonuclease Causes Failure of Base Excision Repair in Culture-Adapted Human Embryonic Stem Cells. Stem Cells 2013; 31:693-702. [DOI: 10.1002/stem.1312] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Accepted: 12/01/2012] [Indexed: 11/09/2022]
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Kollár P, Bárta T, Závalová V, Smejkal K, Hampl A. Geranylated flavanone tomentodiplacone B inhibits proliferation of human monocytic leukaemia (THP-1) cells. Br J Pharmacol 2011; 162:1534-41. [PMID: 21175584 DOI: 10.1111/j.1476-5381.2010.01171.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND AND PURPOSE Paulownia tomentosa is a rich source of geranylated flavanones, some of which we have previously shown to have cytotoxic activity. To identify members of this class of compounds with cytostatic effects, we assessed the effects of the geranylated flavanone tomentodiplacone B (TOM B) on cell cycle progression and cell cycle regulatory pathways of THP-1 human monocytic leukaemia cells. EXPERIMENTAL APPROACH Cell viability was measured by dye exclusion and proliferation by WST-1 assays; cell cycle was monitored by flow cytometry. Regulatory proteins were assessed by immunoprecipitation and kinase assays, and Western blotting. KEY RESULTS Tomentodiplacone B had no effect during the first 24 h of cell growth at concentrations between 1 and 2.5 µM, but inhibited cell growth in a dose-dependent manner at concentrations of 5 µM or higher. Growth inhibition during the first 24 h of exposure to TOM B was not accompanied by cytotoxicity as cells were accumulated in G1 phase dose-dependently. This G1 phase accumulation was associated with down-regulation of cyclin-dependent kinase 2 activity and also protein levels of cyclins E1 and A2. However, key stress-related molecules (γ-H2AX, p53 and p21) were not induced, suggesting that TOM B acts by directly inhibiting the cyclin-dependent kinase 2 signalling pathway rather than initiating DNA damage or cellular stress. CONCLUSIONS AND IMPLICATIONS Our study provides the first evidence that TOM B directly inhibits proliferation of human monocytic leukaemia cells, and thus is a potential anticancer agent, preventing leukaemia cells from progressing from G1 phase into DNA synthesis.
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Affiliation(s)
- Peter Kollár
- Department of Human Pharmacology and Toxicology, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic.
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Holubcová Z, Matula P, Sedláčková M, Vinarský V, Doležalová D, Bárta T, Dvořák P, Hampl A. Human embryonic stem cells suffer from centrosomal amplification. Stem Cells 2011; 29:46-56. [PMID: 20960514 DOI: 10.1002/stem.549] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Propagation of human embryonic stem cells (hESCs) in culture tends to alter karyotype, potentially limiting the prospective use of these cells in patients. The chromosomal instability of some malignancies is considered to be driven, at least in part, by centrosomal overamplification, perturbing balanced chromosome segregation. Here, we report, for the first time, that very high percentage of cultured hESCs has supernumerary centrosomes during mitosis. Supernumerary centrosomes were strictly associated with an undifferentiated hESC state and progressively disappeared on prolonged propagation in culture. Improved attachment to culture substratum and inhibition of CDK2 and Aurora A (key regulators of centrosomal metabolism) diminished the frequency of multicentrosomal mitoses. Thus, both attenuated cell attachment and deregulation of machinery controlling centrosome number contribute to centrosomal overamplification in hESCs. Linking the excessive number of centrosomes in mitoses to the ploidy indicated that both overduplication within a single cell cycle and mitotic failure contributed to generation of numerical centrosomal abnormalities in hESCs. Collectively, our data indicate that supernumerary centrosomes are a significant risk factor for chromosome instability in cultured hESCs and should be evaluated when new culture conditions are being implemented.
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Affiliation(s)
- Zuzana Holubcová
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
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Bárta T. [Chronic headaches following head injuries]. Cesk Otolaryngol 1965; 14:253-6. [PMID: 5842217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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