1
|
Klimovič Š, Beckerová D, Věžník J, Kabanov D, Lacina K, Jelinkova S, Gumulec J, Rotrekl V, Přibyl J. Hyaluronic acid-based hydrogels with tunable mechanics improved structural and contractile properties of cells. Biomater Adv 2024; 159:213819. [PMID: 38430724 DOI: 10.1016/j.bioadv.2024.213819] [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] [Received: 09/13/2023] [Revised: 02/19/2024] [Accepted: 02/27/2024] [Indexed: 03/05/2024]
Abstract
Extracellular matrix (ECM) regulates cellular responses through mechanotransduction. The standard approach of in vitro culturing on plastic surfaces overlooks this phenomenon, so there is a need for biocompatible materials that exhibit adjustable mechanical and structural properties, promote cell adhesion and proliferation at low cost and for use in 2D or 3D cell cultures. This study presents a new tunable hydrogel system prepared from high-molecular hyaluronic acid (HA), Bovine serum albumin (BSA), and gelatin cross-linked using EDC/NHS. Hydrogels with Young's moduli (E) ranging from subunit to units of kilopascals were prepared by gradually increasing HA and BSA concentrations. Concentrated high-molecular HA network led to stiffer hydrogel with lower cluster size and swelling capacity. Medium and oxygen diffusion capability of all hydrogels showed they are suitable for 3D cell cultures. Mechanical and structural changes of mouse embryonic fibroblasts (MEFs) on hydrogels were compared with cells on standard cultivation surfaces. Experiments showed that hydrogels have suitable mechanical and cell adhesion capabilities, resulting in structural changes of actin filaments. Lastly, applying hydrogel for a more complex HL-1 cell line revealed improved mechanical and electrophysiological contractile properties.
Collapse
Affiliation(s)
- Šimon Klimovič
- CEITEC, Masaryk University, Brno, Czech Republic; Department of Biochemistry, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Deborah Beckerová
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic; ICRC, St. Anne's University Hospital, Brno, Czech Republic
| | - Jakub Věžník
- CEITEC, Masaryk University, Brno, Czech Republic; Department of Chemistry, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Daniil Kabanov
- CEITEC, Masaryk University, Brno, Czech Republic; Department of Biochemistry, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Karel Lacina
- CEITEC, Masaryk University, Brno, Czech Republic
| | - Sarka Jelinkova
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Jaromír Gumulec
- Department of Pathophysiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Vladimír Rotrekl
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic; ICRC, St. Anne's University Hospital, Brno, Czech Republic
| | - Jan Přibyl
- CEITEC, Masaryk University, Brno, Czech Republic.
| |
Collapse
|
2
|
Franek M, Kilar A, Fojtík P, Olšinová M, Benda A, Rotrekl V, Dvořáčková M, Fajkus J. Super-resolution microscopy of chromatin fibers and quantitative DNA methylation analysis of DNA fiber preparations. J Cell Sci 2021; 134:jcs258374. [PMID: 34350964 DOI: 10.1242/jcs.258374] [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: 01/06/2021] [Accepted: 07/05/2021] [Indexed: 11/20/2022] Open
Abstract
Analysis of histone variants and epigenetic marks is dominated by genome-wide approaches in the form of chromatin immunoprecipitation-sequencing (ChIP-seq) and related methods. Although uncontested in their value for single-copy genes, mapping the chromatin of DNA repeats is problematic for biochemical techniques that involve averaging of cell populations or analysis of clusters of tandem repeats in a single-cell analysis. Extending chromatin and DNA fibers allows us to study the epigenetics of individual repeats in their specific chromosomal context, and thus constitutes an important tool for gaining a complete understanding of the epigenetic organization of genomes. We report that using an optimized fiber extension protocol is essential in order to obtain more reproducible data and to minimize the clustering of fibers. We also demonstrate that the use of super-resolution microscopy is important for reliable evaluation of the distribution of histone modifications on individual fibers. Furthermore, we introduce a custom script for the analysis of methylation levels on DNA fibers and apply it to map the methylation of telomeres, ribosomal genes and centromeres.
Collapse
Affiliation(s)
- Michal Franek
- Mendel Centre for Plant Genomics and Proteomics, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic
| | - Agata Kilar
- Mendel Centre for Plant Genomics and Proteomics, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic
- Laboratory of Functional Genomics and Proteomics, National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 5, CZ-61137 Brno, Czech Republic
| | - Petr Fojtík
- International Clinical Research Center (ICRC) at St. Anne's University Hospital, Pekařská 53, CZ-65691 Brno, Czech Republic
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic
| | - Marie Olšinová
- Charles University, Faculty of Science, Biology Section, Imaging methods core facility at BIOCEV, Průmyslová 595, 252 50 Vestec, Czech Republic
| | - Aleš Benda
- Charles University, Faculty of Science, Biology Section, Imaging methods core facility at BIOCEV, Průmyslová 595, 252 50 Vestec, Czech Republic
| | - Vladimír Rotrekl
- International Clinical Research Center (ICRC) at St. Anne's University Hospital, Pekařská 53, CZ-65691 Brno, Czech Republic
- Department of Biology, Faculty of Medicine, Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic
| | - Martina Dvořáčková
- Mendel Centre for Plant Genomics and Proteomics, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic
| | - Jíří Fajkus
- Mendel Centre for Plant Genomics and Proteomics, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, CZ-62500 Brno, Czech Republic
- Laboratory of Functional Genomics and Proteomics, National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 5, CZ-61137 Brno, Czech Republic
| |
Collapse
|
3
|
Štětková M, Growková K, Fojtík P, Valčíková B, Palušová V, Verlande A, Jorda R, Kryštof V, Hejret V, Alexiou P, Rotrekl V, Uldrijan S. CDK9 activity is critical for maintaining MDM4 overexpression in tumor cells. Cell Death Dis 2020; 11:754. [PMID: 32934219 PMCID: PMC7494941 DOI: 10.1038/s41419-020-02971-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 08/19/2020] [Accepted: 08/27/2020] [Indexed: 12/31/2022]
Abstract
The identification of the essential role of cyclin-dependent kinases (CDKs) in the control of cell division has prompted the development of small-molecule CDK inhibitors as anticancer drugs. For many of these compounds, the precise mechanism of action in individual tumor types remains unclear as they simultaneously target different classes of CDKs - enzymes controlling the cell cycle progression as well as CDKs involved in the regulation of transcription. CDK inhibitors are also capable of activating p53 tumor suppressor in tumor cells retaining wild-type p53 gene by modulating MDM2 levels and activity. In the current study, we link, for the first time, CDK activity to the overexpression of the MDM4 (MDMX) oncogene in cancer cells. Small-molecule drugs targeting the CDK9 kinase, dinaciclib, flavopiridol, roscovitine, AT-7519, SNS-032, and DRB, diminished MDM4 levels and activated p53 in A375 melanoma and MCF7 breast carcinoma cells with only a limited effect on MDM2. These results suggest that MDM4, rather than MDM2, could be the primary transcriptional target of pharmacological CDK inhibitors in the p53 pathway. CDK9 inhibitor atuveciclib downregulated MDM4 and enhanced p53 activity induced by nutlin-3a, an inhibitor of p53-MDM2 interaction, and synergized with nutlin-3a in killing A375 melanoma cells. Furthermore, we found that human pluripotent stem cell lines express significant levels of MDM4, which are also maintained by CDK9 activity. In summary, we show that CDK9 activity is essential for the maintenance of high levels of MDM4 in human cells, and drugs targeting CDK9 might restore p53 tumor suppressor function in malignancies overexpressing MDM4.
Collapse
Affiliation(s)
- Monika Štětková
- Faculty of Medicine, Department of Biology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Kateřina Growková
- Faculty of Medicine, Department of Biology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Petr Fojtík
- Faculty of Medicine, Department of Biology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
- International Clinical Research Center, St. Anne's University Hospital, Pekařská 53, 656 91, Brno, Czech Republic
| | - Barbora Valčíková
- Faculty of Medicine, Department of Biology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
- International Clinical Research Center, St. Anne's University Hospital, Pekařská 53, 656 91, Brno, Czech Republic
| | - Veronika Palušová
- Faculty of Medicine, Department of Biology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
- International Clinical Research Center, St. Anne's University Hospital, Pekařská 53, 656 91, Brno, Czech Republic
| | - Amandine Verlande
- Faculty of Medicine, Department of Biology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
- International Clinical Research Center, St. Anne's University Hospital, Pekařská 53, 656 91, Brno, Czech Republic
| | - Radek Jorda
- Laboratory of Growth Regulators, Palacký University and Institute of Experimental Botany, The Czech Academy of Sciences, Šlechtitelů 27, 783 71, Olomouc, Czech Republic
- Faculty of Medicine and Dentistry, Institute of Molecular and Translational Medicine, Palacký University, Hněvotínská 5, 779 00, Olomouc, Czech Republic
| | - Vladimír Kryštof
- Laboratory of Growth Regulators, Palacký University and Institute of Experimental Botany, The Czech Academy of Sciences, Šlechtitelů 27, 783 71, Olomouc, Czech Republic
- Faculty of Medicine and Dentistry, Institute of Molecular and Translational Medicine, Palacký University, Hněvotínská 5, 779 00, Olomouc, Czech Republic
| | - Václav Hejret
- Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Panagiotis Alexiou
- Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
| | - Vladimír Rotrekl
- Faculty of Medicine, Department of Biology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic
- International Clinical Research Center, St. Anne's University Hospital, Pekařská 53, 656 91, Brno, Czech Republic
| | - Stjepan Uldrijan
- Faculty of Medicine, Department of Biology, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic.
- International Clinical Research Center, St. Anne's University Hospital, Pekařská 53, 656 91, Brno, Czech Republic.
| |
Collapse
|
4
|
Palušová V, Renzová T, Verlande A, Vaclová T, Medková M, Cetlová L, Sedláčková M, Hříbková H, Slaninová I, Krutá M, Rotrekl V, Uhlířová H, Křížová A, Chmelík R, Veselý P, Krafčíková M, Trantírek L, Schink KO, Uldrijan S. Dual Targeting of BRAF and mTOR Signaling in Melanoma Cells with Pyridinyl Imidazole Compounds. Cancers (Basel) 2020; 12:cancers12061516. [PMID: 32531927 PMCID: PMC7352453 DOI: 10.3390/cancers12061516] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 02/29/2020] [Revised: 06/04/2020] [Accepted: 06/05/2020] [Indexed: 12/19/2022] Open
Abstract
BRAF inhibitors can delay the progression of metastatic melanoma, but resistance usually emerges, leading to relapse. Drugs simultaneously targeting two or more pathways essential for cancer growth could slow or prevent the development of resistant clones. Here, we identified pyridinyl imidazole compounds SB202190, SB203580, and SB590885 as dual inhibitors of critical proliferative pathways in human melanoma cells bearing the V600E activating mutation of BRAF kinase. We found that the drugs simultaneously disrupt the BRAF V600E-driven extracellular signal-regulated kinase (ERK) mitogen-activated protein kinase (MAPK) activity and the mechanistic target of rapamycin complex 1 (mTORC1) signaling in melanoma cells. Pyridinyl imidazole compounds directly inhibit BRAF V600E kinase. Moreover, they interfere with the endolysosomal compartment, promoting the accumulation of large acidic vacuole-like vesicles and dynamic changes in mTOR signaling. A transient increase in mTORC1 activity is followed by the enrichment of the Ragulator complex protein p18/LAMTOR1 at contact sites of large vesicles and delocalization of mTOR from the lysosomes. The induced disruption of the endolysosomal pathway not only disrupts mTORC1 signaling, but also renders melanoma cells sensitive to endoplasmic reticulum (ER) stress. Our findings identify new activities of pharmacologically relevant small molecule compounds and provide a biological rationale for the development of anti-melanoma therapeutics based on the pyridinyl imidazole core.
Collapse
Affiliation(s)
- Veronika Palušová
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
- International Clinical Research Center, St. Anne’s University Hospital Brno, Pekařská 664/53, 656 91 Brno, Czech Republic
| | - Tereza Renzová
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
| | - Amandine Verlande
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
| | - Tereza Vaclová
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
| | - Michaela Medková
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
| | - Linda Cetlová
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
| | - Miroslava Sedláčková
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
| | - Hana Hříbková
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
| | - Iva Slaninová
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
| | - Miriama Krutá
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
| | - Vladimír Rotrekl
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
- International Clinical Research Center, St. Anne’s University Hospital Brno, Pekařská 664/53, 656 91 Brno, Czech Republic
| | - Hana Uhlířová
- Institute of Physical Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic; (H.U.); (R.C.)
- CEITEC—Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, 612 00 Brno, Czech Republic; (A.K.); (P.V.)
| | - Aneta Křížová
- CEITEC—Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, 612 00 Brno, Czech Republic; (A.K.); (P.V.)
| | - Radim Chmelík
- Institute of Physical Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic; (H.U.); (R.C.)
- CEITEC—Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, 612 00 Brno, Czech Republic; (A.K.); (P.V.)
| | - Pavel Veselý
- CEITEC—Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, 612 00 Brno, Czech Republic; (A.K.); (P.V.)
| | - Michaela Krafčíková
- National Centre for Biomolecular Research, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic;
| | - Lukáš Trantírek
- CEITEC—Central European Institute of Technology, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic;
| | - Kay Oliver Schink
- Centre for Cancer Cell Reprogramming, Faculty of Medicine, University of Oslo, Montebello, N-0379 Oslo, Norway;
- Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, N-0379 Oslo, Norway
| | - Stjepan Uldrijan
- Faculty of Medicine, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic; (V.P.); (T.R.); (A.V.); (T.V.); (M.M.); (L.C.); (M.S.); (H.H.); (I.S.); (M.K.); (V.R.)
- International Clinical Research Center, St. Anne’s University Hospital Brno, Pekařská 664/53, 656 91 Brno, Czech Republic
- Correspondence:
| |
Collapse
|
5
|
Golan M, Přibyl J, Pešl M, Jelínková Š, Acimovic I, Jaroš J, Rotrekl V, Falk M, Skládal P, Kratochvílová I. Human fibroblast post-thaw regeneration monitored by afm and fluorescence microscopy. Cryobiology 2018. [DOI: 10.1016/j.cryobiol.2018.10.065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
6
|
Golan M, Jelinkova S, Kratochvílová I, Skládal P, Pešl M, Rotrekl V, Pribyl J. AFM Monitoring the Influence of Selected Cryoprotectants on Regeneration of Cryopreserved Cells Mechanical Properties. Front Physiol 2018; 9:804. [PMID: 30008675 PMCID: PMC6034176 DOI: 10.3389/fphys.2018.00804] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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: 04/01/2018] [Accepted: 06/08/2018] [Indexed: 12/02/2022] Open
Abstract
Cryopreservation of cells (mouse embryonic fibroblasts) is a fundamental task for wide range of applications. In practice, cells are protected against damage during freezing by applications of specific cryoprotectants and freezing/melting protocols. In this study by using AFM and fluorescence microscopy we showed how selected cryoprotectants (dimethyl sulfoxide and polyethylene glycol) affected the cryopreserved cells mechanical properties (stiffness) and how these parameters are correlated with cytoskeleton damage and reconstruction. We showed how cryopreserved (frozen and thawed) cells' stiffness change according to type of applied cryoprotectant and its functionality in extracellular or intracellular space. We showed that AFM can be used as technique for investigation of cryopreserved cells surfaces state and development ex vivo. Our results offer a new perspective on the monitoring and characterization of frozen cells recovery by measuring changes in elastic properties by nanoindentation technique. This may lead to a new and detailed way of investigating the post-thaw development of cryopreserved cells which allows to distinguish between different cell parts.
Collapse
Affiliation(s)
- Martin Golan
- Department of Analysis of Functional Materials, Institute of Physics, Academy of Sciences Czech Republic, Prague, Czechia
| | - Sarka Jelinkova
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia.,International Clinical Research Center, St. Anne's University Hospital, Brno, Czechia
| | - Irena Kratochvílová
- Department of Analysis of Functional Materials, Institute of Physics, Academy of Sciences Czech Republic, Prague, Czechia
| | - Petr Skládal
- Central European Institute of Technology, Masaryk University, Brno, Czechia
| | - Martin Pešl
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia.,International Clinical Research Center, St. Anne's University Hospital, Brno, Czechia.,First Department of Internal Medicine/Cardioangiology, Masaryk University, Brno, Czechia
| | - Vladimír Rotrekl
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czechia.,International Clinical Research Center, St. Anne's University Hospital, Brno, Czechia
| | - Jan Pribyl
- Central European Institute of Technology, Masaryk University, Brno, Czechia
| |
Collapse
|
7
|
Jelinkova S, Fojtik P, Kohutova A, Finan-Marchi A, Sleiman Y, Aimond F, Vilotic A, Carnac G, Meli A, Rotrekl V. P257Duchenne muscular dystrophy leads to compromised genomic stability in stem cells and depletion of cardiac progenitors in failing heart. Cardiovasc Res 2018. [DOI: 10.1093/cvr/cvy060.178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- S Jelinkova
- Masaryk University, Department of Biology, Faculty of Medicine, Brno, Czech Republic
| | - P Fojtik
- Masaryk University, Department of Biology, Faculty of Medicine, Brno, Czech Republic
| | - A Kohutova
- Masaryk University, Department of Biology, Faculty of Medicine, Brno, Czech Republic
| | - A Finan-Marchi
- University of Montpellier, PhyMedExp, U1046, INSERM, Montpellier, France
| | - Y Sleiman
- University of Montpellier, PhyMedExp, U1046, INSERM, Montpellier, France
| | - F Aimond
- University of Montpellier, PhyMedExp, U1046, INSERM, Montpellier, France
| | - A Vilotic
- Masaryk University, Department of Biology, Faculty of Medicine, Brno, Czech Republic
| | - G Carnac
- University of Montpellier, PhyMedExp, U1046, INSERM, Montpellier, France
| | - A Meli
- University of Montpellier, PhyMedExp, U1046, INSERM, Montpellier, France
| | - V Rotrekl
- Masaryk University, Department of Biology, Faculty of Medicine, Brno, Czech Republic
| |
Collapse
|
8
|
Pesl M, Jelinkova S, Caluori G, Holicka M, Zampachova V, Nemec P, Dvorak P, Rotrekl V. P139Human cardiac progenitor analysis in dystriophin cardiomyopathy after cardiac transplantation. Cardiovasc Res 2018. [DOI: 10.1093/cvr/cvy060.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- M Pesl
- St. Anne's University Hospital, Center of Biomolecular and Cellular Engineering and dep. of Cardiovascular diseases, Brno, Czech Republic
| | - S Jelinkova
- Masaryk University, Biology dep., Faculty of Medicine, Brno, Czech Republic
| | - G Caluori
- St. Anne's University Hospital, ICRC and CEITEC, Masaryk University,, Brno, Czech Republic
| | - M Holicka
- Masaryk University, Department of Cardiology, University hospital Brno and Faculty of Medicine, Brno, Czech Republic
| | - V Zampachova
- Masaryk University, St. Anne's University Hospital, Ist Department of Pathology, Faculty of Medicine, Brno, Czech Republic
| | - P Nemec
- Center for Cardiovascular Surgery and Transplantation, Brno, Czech Republic
| | - P Dvorak
- Masaryk University, Biology dep., Faculty of Medicine, Brno, Czech Republic
| | - V Rotrekl
- Masaryk University, Biology dep., Faculty of Medicine, Brno, Czech Republic
| |
Collapse
|
9
|
Krutá M, Šeneklová M, Raška J, Salykin A, Zerzánková L, Pešl M, Bártová E, Franek M, Baumeisterová A, Košková S, Neelsen KJ, Hampl A, Dvořák P, Rotrekl V. Mutation frequency dynamics in HPRT locus in culture-adapted human embryonic stem cells and induced pluripotent stem cells correspond to their differentiated counterparts. Stem Cells Dev 2014; 23:2443-54. [PMID: 24836366 DOI: 10.1089/scd.2013.0611] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The genomic destabilization associated with the adaptation of human embryonic stem cells (hESCs) to culture conditions or the reprogramming of induced pluripotent stem cells (iPSCs) increases the risk of tumorigenesis upon the clinical use of these cells and decreases their value as a model for cell biology studies. Base excision repair (BER), a major genomic integrity maintenance mechanism, has been shown to fail during hESC adaptation. Here, we show that the increase in the mutation frequency (MF) caused by the inhibition of BER was similar to that caused by the hESC adaptation process. The increase in MF reflected the failure of DNA maintenance mechanisms and the subsequent increase in MF rather than being due solely to the accumulation of mutants over a prolonged period, as was previously suggested. The increase in the ionizing-radiation-induced MF in adapted hESCs exceeded the induced MF in nonadapted hESCs and differentiated cells. Unlike hESCs, the overall DNA maintenance in iPSCs, which was reflected by the MF, was similar to that in differentiated cells regardless of the time spent in culture and despite the upregulation of several genes responsible for genome maintenance during the reprogramming process. Taken together, our results suggest that the changes in BER activity during the long-term cultivation of hESCs increase the mutagenic burden, whereas neither reprogramming nor long-term propagation in culture changes the MF in iPSCs.
Collapse
Affiliation(s)
- Miriama Krutá
- 1 Department of Biology, Faculty of Medicine, Masaryk University , Brno, Czech Republic
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
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]
|
11
|
Rotrekl V, Nejedlá E, Kucera I, Abdallah F, Palme K, Brzobohatý B. The role of cysteine residues in structure and enzyme activity of a maize beta-glucosidase. Eur J Biochem 1999; 266:1056-65. [PMID: 10583402 DOI: 10.1046/j.1432-1327.1999.00948.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The maize Zm-p60.1 gene encodes a beta-glucosidase that can release active cytokinins from their storage forms, cytokinin-O-glucosides. Mature catalytically active Zm-p60.1 is a homodimer containing five cysteine residues per a subunit. Their role was studied by mutating them to alanine (A), serine (S), arginine (R) or aspartic acid (D) using site-directed mutagenesis, and subsequent heterologous expression in Escherichia coli. All substitutions of C205 and C211 resulted in decreased formation and/or stability of the homodimer, manifested as accumulation of high levels of monomer in the bacterial expression system. Examination of urea- and glutathione-induced dissociation patterns of the homodimer to the monomers, HPLC profiles of hydrolytic fragments of reduced and oxidized forms, and a homology-based three-dimensional structural model revealed that an intramolecular disulfide bridge formed between C205 and C211 within the subunits stabilized the quaternary structure of the enzyme. Mutating C52 to R produced a monomeric enzyme protein, too. No detectable effects on homodimer formation were apparent in C170 and C479 mutants. Given the Km values for C170A/S mutants were equal to that for the wild-type enzyme, C170 cannot participate in enzyme-substrate interactions. Possible indirect effects of C170A/S mutations on catalytic activity of the enzyme were inferred from slight decreases in the apparent catalytic activity, k'cat. C170 is located on a hydrophobic side of an alpha-helix packed against hydrophobic amino-acid residues of beta-strand 4, indicating participation of C170 in stabilization of a (beta/alpha)8 barrel structure in the enzyme. In C479A/D/R/S mutants, Km and k'cat were influenced more significantly suggesting a role for C479 in enzyme catalytic action.
Collapse
Affiliation(s)
- V Rotrekl
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic
| | | | | | | | | | | |
Collapse
|
12
|
Janovská D, Výmola F, Pribán E, Rotrekl V. Dynamics of the antibacterial activity of blood serum and bile following administration of trimethoprim and sulphamethoxazol. 1. Determination of active concentrations at intervals of 6 and 12 hours. J Hyg Epidemiol Microbiol Immunol 1973; 17:364-7. [PMID: 4795568] [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: 01/12/2023]
|
13
|
Výmola F, Rotrekl V. [The selection of antibiotics in the treatment of patients with chronic cardio-pulmonary disease during an influenza epidemic]. Vnitr Lek 1967; 13:401-6. [PMID: 6047215] [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: 01/18/2023]
|
14
|
Rotrekl V, Výmola F, Jedlicková Z, Filsaková E. [The significance of staphylococci in pulmonary heart diseases during influenza epidemics]. Vnitr Lek 1966; 12:917-921. [PMID: 5976809] [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: 05/21/2023]
|