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Ozonoff A, Schaenman J, Jayavelu ND, Milliren CE, Calfee CS, Cairns CB, Kraft M, Baden LR, Shaw AC, Krammer F, van Bakel H, Esserman DA, Liu S, Sesma AF, Simon V, Hafler DA, Montgomery RR, Kleinstein SH, Levy O, Bime C, Haddad EK, Erle DJ, Pulendran B, Nadeau KC, Davis MM, Hough CL, Messer WB, Higuita NIA, Metcalf JP, Atkinson MA, Brakenridge SC, Corry D, Kheradmand F, Ehrlich LI, Melamed E, McComsey GA, Sekaly R, Diray-Arce J, Peters B, Augustine AD, Reed EF, Altman MC, Becker PM, Rouphael N, Ozonoff A, Schaenman J, Jayavelu ND, Milliren CE, Calfee CS, Cairns CB, Kraft M, Baden LR, Shaw AC, Krammer F, van Bakel H, Esserman DA, Liu S, Sesma AF, Simon V, Hafler DA, Montgomery RR, Kleinstein SH, Levy O, Bime C, Haddad EK, Erle DJ, Pulendran B, Nadeau KC, Davis MM, Hough CL, Messer WB, Higuita NIA, Metcalf JP, Atkinson MA, Brakenridge SC, Corry D, Kheradmand F, Ehrlich LI, Melamed E, McComsey GA, Sekaly R, Diray-Arce J, Peters B, Augustine AD, Reed EF, McEnaney K, Barton B, Lentucci C, Saluvan M, Chang AC, Hoch A, Albert M, Shaheen T, Kho AT, Thomas S, Chen J, Murphy MD, Cooney M, Presnell S, Fragiadakis GK, Patel R, Guan L, Gygi J, Pawar S, Brito A, Khalil Z, Maguire C, Fourati S, Overton JA, Vita R, Westendorf K, Salehi-Rad R, Leligdowicz A, Matthay MA, Singer JP, Kangelaris KN, Hendrickson CM, Krummel MF, Langelier CR, Woodruff PG, Powell DL, Kim JN, Simmons B, Goonewardene IM, Smith CM, Martens M, Mosier J, Kimura H, Sherman AC, Walsh SR, Issa NC, Dela Cruz C, Farhadian S, Iwasaki A, Ko AI, Chinthrajah S, Ahuja N, Rogers AJ, Artandi M, Siegel SA, Lu Z, Drevets DA, Brown BR, Anderson ML, Guirgis FW, Thyagarajan RV, Rousseau JF, Wylie D, Busch J, Gandhi S, Triplett TA, Yendewa G, Giddings O, Anderson EJ, Mehta AK, Sevransky JE, Khor B, Rahman A, Stadlbauer D, Dutta J, Xie H, Kim-Schulze S, Gonzalez-Reiche AS, van de Guchte A, Farrugia K, Khan Z, Maecker HT, Elashoff D, Brook J, Ramires-Sanchez E, Llamas M, Rivera A, Perdomo C, Ward DC, Magyar CE, Fulcher JA, Abe-Jones Y, Asthana S, Beagle A, Bhide S, Carrillo SA, Chak S, Fragiadakis GK, Ghale R, Gonzalez A, Jauregui A, Jones N, Lea T, Lee D, Lota R, Milush J, Nguyen V, Pierce L, Prasad PA, Rao A, Samad B, Shaw C, Sigman A, Sinha P, Ward A, Willmore A, Zhan J, Rashid S, Rodriguez N, Tang K, Altamirano LT, Betancourt L, Curiel C, Sutter N, Paz MT, Tietje-Ulrich G, Leroux C, Connors J, Bernui M, Kutzler MA, Edwards C, Lee E, Lin E, Croen B, Semenza NC, Rogowski B, Melnyk N, Woloszczuk K, Cusimano G, Bell MR, Furukawa S, McLin R, Marrero P, Sheidy J, Tegos GP, Nagle C, Mege N, Ulring K, Seyfert-Margolis V, Conway M, Francisco D, Molzahn A, Erickson H, Wilson CC, Schunk R, Sierra B, Hughes T, Smolen K, Desjardins M, van Haren S, Mitre X, Cauley J, Li X, Tong A, Evans B, Montesano C, Licona JH, Krauss J, Chang JBP, Izaguirre N, Chaudhary O, Coppi A, Fournier J, Mohanty S, Muenker MC, Nelson A, Raddassi K, Rainone M, Ruff WE, Salahuddin S, Schulz WL, Vijayakumar P, Wang H, Wunder Jr. E, Young HP, Zhao Y, Saksena M, Altman D, Kojic E, Srivastava K, Eaker LQ, Bermúdez-González MC, Beach KF, Sominsky LA, Azad AR, Carreño JM, Singh G, Raskin A, Tcheou J, Bielak D, Kawabata H, Mulder LCF, Kleiner G, Lee AS, Do ED, Fernandes A, Manohar M, Hagan T, Blish CA, Din HN, Roque J, Yang S, Brunton A, Sullivan PE, Strnad M, Lyski ZL, Coulter FJ, Booth JL, Sinko LA, Moldawer LL, Borresen B, Roth-Manning B, Song LZ, Nelson E, Lewis-Smith M, Smith J, Tipan PG, Siles N, Bazzi S, Geltman J, Hurley K, Gabriele G, Sieg S, Vaysman T, Bristow L, Hussaini L, Hellmeister K, Samaha H, Cheng A, Spainhour C, Scherer EM, Johnson B, Bechnak A, Ciric CR, Hewitt L, Carter E, Mcnair N, Panganiban B, Huerta C, Usher J, Ribeiro SP, Altman MC, Becker PM, Rouphael N. Phenotypes of disease severity in a cohort of hospitalized COVID-19 patients: Results from the IMPACC study. EBioMedicine 2022; 83:104208. [PMID: 35952496 PMCID: PMC9359694 DOI: 10.1016/j.ebiom.2022.104208] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [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: 03/24/2022] [Revised: 07/11/2022] [Accepted: 07/25/2022] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Better understanding of the association between characteristics of patients hospitalized with coronavirus disease 2019 (COVID-19) and outcome is needed to further improve upon patient management. METHODS Immunophenotyping Assessment in a COVID-19 Cohort (IMPACC) is a prospective, observational study of 1164 patients from 20 hospitals across the United States. Disease severity was assessed using a 7-point ordinal scale based on degree of respiratory illness. Patients were prospectively surveyed for 1 year after discharge for post-acute sequalae of COVID-19 (PASC) through quarterly surveys. Demographics, comorbidities, radiographic findings, clinical laboratory values, SARS-CoV-2 PCR and serology were captured over a 28-day period. Multivariable logistic regression was performed. FINDINGS The median age was 59 years (interquartile range [IQR] 20); 711 (61%) were men; overall mortality was 14%, and 228 (20%) required invasive mechanical ventilation. Unsupervised clustering of ordinal score over time revealed distinct disease course trajectories. Risk factors associated with prolonged hospitalization or death by day 28 included age ≥ 65 years (odds ratio [OR], 2.01; 95% CI 1.28-3.17), Hispanic ethnicity (OR, 1.71; 95% CI 1.13-2.57), elevated baseline creatinine (OR 2.80; 95% CI 1.63- 4.80) or troponin (OR 1.89; 95% 1.03-3.47), baseline lymphopenia (OR 2.19; 95% CI 1.61-2.97), presence of infiltrate by chest imaging (OR 3.16; 95% CI 1.96-5.10), and high SARS-CoV2 viral load (OR 1.53; 95% CI 1.17-2.00). Fatal cases had the lowest ratio of SARS-CoV-2 antibody to viral load levels compared to other trajectories over time (p=0.001). 589 survivors (51%) completed at least one survey at follow-up with 305 (52%) having at least one symptom consistent with PASC, most commonly dyspnea (56% among symptomatic patients). Female sex was the only associated risk factor for PASC. INTERPRETATION Integration of PCR cycle threshold, and antibody values with demographics, comorbidities, and laboratory/radiographic findings identified risk factors for 28-day outcome severity, though only female sex was associated with PASC. Longitudinal clinical phenotyping offers important insights, and provides a framework for immunophenotyping for acute and long COVID-19. FUNDING NIH.
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Affiliation(s)
- Al Ozonoff
- Clinical & Data Coordinating Center (CDCC); Precision Vaccines Program, Boston Children's Hospital, Boston, MA, United States
| | - Joanna Schaenman
- David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA, United States
| | | | - Carly E. Milliren
- Clinical & Data Coordinating Center (CDCC); Precision Vaccines Program, Boston Children's Hospital, Boston, MA, United States
| | - Carolyn S. Calfee
- University of California San Francisco School of Medicine, San Francisco, CA, United States
| | - Charles B. Cairns
- Drexel University/Tower Health Hospital, Philadelphia, PA, United States
| | - Monica Kraft
- University of Arizona, Tucson, AZ, United States
| | - Lindsey R. Baden
- Boston Clinical Site: Precision Vaccines Program, Boston Children's Hospital, Brigham and Women's Hospital, and Harvard Medical School, Boston, MA, United States
| | - Albert C. Shaw
- Yale School of Medicine, and Yale School of Public Health, New Haven, CT, United States
| | - Florian Krammer
- Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Harm van Bakel
- Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Denise A. Esserman
- Yale School of Medicine, and Yale School of Public Health, New Haven, CT, United States
| | - Shanshan Liu
- Clinical & Data Coordinating Center (CDCC); Precision Vaccines Program, Boston Children's Hospital, Boston, MA, United States
| | | | - Viviana Simon
- Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - David A. Hafler
- Yale School of Medicine, and Yale School of Public Health, New Haven, CT, United States
| | - Ruth R. Montgomery
- Yale School of Medicine, and Yale School of Public Health, New Haven, CT, United States
| | - Steven H. Kleinstein
- Yale School of Medicine, and Yale School of Public Health, New Haven, CT, United States
| | - Ofer Levy
- Boston Clinical Site: Precision Vaccines Program, Boston Children's Hospital, Brigham and Women's Hospital, and Harvard Medical School, Boston, MA, United States
| | | | - Elias K. Haddad
- Drexel University/Tower Health Hospital, Philadelphia, PA, United States
| | - David J. Erle
- University of California San Francisco School of Medicine, San Francisco, CA, United States
| | | | | | | | | | | | | | - Jordan P. Metcalf
- Oklahoma University Health Sciences Center, Oklahoma, OK, United States
| | - Mark A. Atkinson
- University of Florida, Gainesville and University of South Florida, Tampa, FL, United States
| | - Scott C. Brakenridge
- University of Florida, Gainesville and University of South Florida, Tampa, FL, United States
| | - David Corry
- Baylor College of Medicine, and the Center for Translational Research on Inflammatory Diseases, Michael E. DeBakey, Houston, TX, United States
| | - Farrah Kheradmand
- Baylor College of Medicine, and the Center for Translational Research on Inflammatory Diseases, Michael E. DeBakey, Houston, TX, United States
| | | | - Esther Melamed
- The University of Texas at Austin, Austin, TX, United States
| | | | - Rafick Sekaly
- Case Western Reserve University, Cleveland, OH, United States
| | - Joann Diray-Arce
- Clinical & Data Coordinating Center (CDCC); Precision Vaccines Program, Boston Children's Hospital, Boston, MA, United States
| | - Bjoern Peters
- La Jolla Institute for Immunology, La Jolla, CA, United States
| | - Alison D. Augustine
- National Institute of Allergy and Infectious Diseases/National Institutes of Health, Bethesda, MD, United States
| | - Elaine F. Reed
- David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, CA, United States
| | | | - Patrice M. Becker
- National Institute of Allergy and Infectious Diseases/National Institutes of Health, Bethesda, MD, United States
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Špičáková A, Kraus P, Gucký T, Kryštof V, Strnad M, Bazgier V, Otyepka M, Kubíčková V, Poruba M, Rácová Z, Zapletalová I, Anzenbacher P. In vitro and in silico studies of interaction of synthetic 2,6,9-trisubstituted purine kinase inhibitors BPA-302, BP-21 and BP-117 with liver drug-metabolizing cytochromes P450. Physiol Res 2020; 69:S627-S636. [PMID: 33646005 DOI: 10.33549/physiolres.934611] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
An evaluation of possible interactions with enzymes of drug metabolism (cytochromes P450, CYP) is an important part of studies on safety and, in general, on the properties of any drug or biologically active compound. The article is focused on the preliminary metabolic study of selected 2,6,9-trisubstituted purine kinase inhibitors with significant anticancer activities which we have developed. The compounds BP-21 and BP-117 represent strong CDK inhibitors and the compound BPA-302 was developed as selective FLT3-ITD kinase inhibitor. Here, emphasis is placed on interactions of these compounds with the nine most important forms of CYP to evaluate the possibility of inhibition of these enzymes. The possibility of their inhibitory effect was studied in vitro on selected human liver microsomal CYP enzymes. The most affected enzyme was CYP2C19. Its activity dropped to 22 % of its original value by BPA 302, to 13 % by BP-21 and to 6 % by BP-117 at the highest concentration tested (250 µmol·l(-1)). The results suggest that the metabolism of concomitantly administered drugs should not be significantly affected at lower doses. Molecular docking of BPA-302 indicated that it can bind to active site of both CYP2C19 and CYP2D6 enzymes above the heme cofactor corroborating the experimental data.
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Affiliation(s)
- A Špičáková
- Department of Pharmacology, Faculty of Medicine, Palacký University Olomouc, Czech Republic.
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Kvasnica M, Oklestkova J, Bazgier V, Rárová L, Korinkova P, Mikulík J, Budesinsky M, Béres T, Berka K, Lu Q, Russinova E, Strnad M. Design, synthesis and biological activities of new brassinosteroid analogues with a phenyl group in the side chain. Org Biomol Chem 2018; 14:8691-8701. [PMID: 27714217 DOI: 10.1039/c6ob01479h] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We have prepared and studied a series of new brassinosteroid derivatives with a p-substituted phenyl group in the side chain. To obtain the best comparison between molecular docking and biological activities both types of brassinosteroids were synthesized; 6-ketones, 10 examples, and B-lactones, 8 examples. The phenyl group was introduced into the steroid skeleton by Horner-Wadsworth-Emmons. The docking studies were carried out using AutoDock Vina 1.05. Plant biological activities were established using different brassinosteroid bioassays in comparison with natural brassinosteroids. Differences in the production of the plant hormone ethylene were also observed in etiolated pea seedlings after treatment with new brassinosteroids. The most active compounds were lactone 8f and 6-oxo derivatives 8c and 9c, their biological activities were comparable or even better than naturally occurring brassinolide. Finally the cytotoxicity of the new derivatives was studied using human normal and cancer cell lines.
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Affiliation(s)
- M Kvasnica
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 27, 78371 Olomouc, Czech Republic.
| | - J Oklestkova
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 27, 78371 Olomouc, Czech Republic.
| | - V Bazgier
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 27, 78371 Olomouc, Czech Republic. and Department of Physical Chemistry, Faculty of Science, Palacký University, tř. 17. Listopadu 12, 77146 Olomouc, Czech Republic
| | - L Rárová
- Department of Chemical Biology and Genetics, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University, Šlechtitelů 27, 78371 Olomouc, Czech Republic
| | - P Korinkova
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 27, 78371 Olomouc, Czech Republic.
| | - J Mikulík
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 27, 78371 Olomouc, Czech Republic.
| | - M Budesinsky
- Institute of Organic Chemistry and Biochemistry, ASCR, Flemingovo n. 2, 16610 Prague 6, Czech Republic
| | - T Béres
- Department of Chemical Biology and Genetics, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University, Šlechtitelů 27, 78371 Olomouc, Czech Republic
| | - K Berka
- Department of Physical Chemistry, Faculty of Science, Palacký University, tř. 17. Listopadu 12, 77146 Olomouc, Czech Republic and Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry Palacky University in Olomouc, 17. listopadu 1131, Olomouc CZ779 00, Czech Republic
| | - Q Lu
- Department of Plant Systems Biology, VIB, 9052 Ghent, Belgium and Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
| | - E Russinova
- Department of Plant Systems Biology, VIB, 9052 Ghent, Belgium and Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
| | - M Strnad
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 27, 78371 Olomouc, Czech Republic.
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Mettbach U, Strnad M, Mancuso S, Baluška F. Immunogold-EM analysis reveal brefeldin a-sensitive clusters of auxin in Arabidopsis root apex cells. Commun Integr Biol 2017; 10:e1327105. [PMID: 28702129 PMCID: PMC5501221 DOI: 10.1080/19420889.2017.1327105] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [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: 02/01/2017] [Revised: 04/13/2017] [Accepted: 04/29/2017] [Indexed: 11/05/2022] Open
Abstract
Immunogold electron microscopy (EM) study of Arabidopsis root apices analyzed using specific IAA antibody and high-pressure freeze fixation technique allowed, for the first time, vizualization of subcellular localization of IAA in cells assembled intactly within plant tissues. Our quantitative analysis reveals that there is considerable portion of IAA gold particles that clusters within vesicles and membraneous compartments in all root apex cells. There are clear tissue-specific and developmental differences of clustered IAA in root apices. These findings have significant consequences for our understanding of this small molecule which is controlling plant growth, development and behavior.
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Affiliation(s)
| | - M. Strnad
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany AS CR & Palacký University, Olomouc, Czech Republic
| | - S. Mancuso
- Department of Plant, Soil and Environmental Science & LINV, University of Florence, Sesto Fiorentino, Italy
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Zhang S, Ulrich M, Gromnicka A, Havlíček L, Kryštof V, Jorda R, Strnad M, Vollmar AM, Zahler S. Anti-angiogenic effects of novel cyclin-dependent kinase inhibitors with a pyrazolo[4,3-d]pyrimidine scaffold. Br J Pharmacol 2016; 173:2645-56. [PMID: 27390037 DOI: 10.1111/bph.13546] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 06/24/2016] [Accepted: 06/28/2016] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND AND PURPOSE Cyclin-dependent kinase 5 (CDK5) has recently emerged as an attractive target in several tumour entities. Inhibition of CDK5 has been shown to have anti-angiogenic effects in vitro and in vivo. However, potent inhibitors of CDK5, which can be applied in vivo, are still scarce. We have recently developed a new series of 5-substituted 3-isopropyl-7-[4-(2-pyridyl)benzyl]amino-1(2)H-pyrazolo[4,3-d]pyrimidines that show a preference for inhibiting CDK5 and tested them in vitro and in vivo in a murine model of hepatocellular carcinoma. EXPERIMENTAL APPROACH All compounds were initially examined for effects on proliferation of HUVECs. The most potent compounds were then tested on migration, and one of them, LGR2674, was selected for assessing effects on nuclear fragmentation, cell cycle, cell viability and metabolic activity. Furthermore, LGR2674 was tested in a tube formation assay and in vivo in a murine model of hepatocellular carcinoma, induced by s.c. injection of HUH7 cells (measurement of in vivo toxicity, tumour vascularization, tumour cell proliferation and tumour size). KEY RESULTS LGR2674 showed an EC50 in the low nanomolar range in the proliferation and migration assays. Cytotoxic effects started at 50 nM, a concentration that did not influence the cell cycle. In vivo, LGR2674 was well tolerated and caused a clear reduction in vessel density in the tumours; also tumour cell proliferation was inhibited and tumour growth retarded. CONCLUSIONS AND IMPLICATIONS Pyrazolo[4,3-d]pyrimidine is a novel scaffold for the development of potent CDK inhibitors with in vivo potential. Such structures are good candidates for broadening our pharmacological arsenal against various tumours.
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Affiliation(s)
- S Zhang
- Chair of Pharmaceutical Biology, Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians-University, Munich, Germany
| | - M Ulrich
- Chair of Pharmaceutical Biology, Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians-University, Munich, Germany
| | - A Gromnicka
- Chair of Pharmaceutical Biology, Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians-University, Munich, Germany
| | - L Havlíček
- Isotope laboratory, Institute of Experimental Botany ASCR, Prague, Czech Republic
| | - V Kryštof
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University & Institute of Experimental Botany AS CR, Olomouc, Czech Republic
| | - R Jorda
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University & Institute of Experimental Botany AS CR, Olomouc, Czech Republic
| | - M Strnad
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký University & Institute of Experimental Botany AS CR, Olomouc, Czech Republic
| | - A M Vollmar
- Chair of Pharmaceutical Biology, Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians-University, Munich, Germany
| | - S Zahler
- Chair of Pharmaceutical Biology, Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians-University, Munich, Germany
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Kanovsky P, Prikrylova Vranova H, Mares J, Mensikova K, Henykova E, Amakorova P, Strnad M. UHPLC-MS/MS quantitative profiling of tryptophane-related neuroactive substances in cerebrospinal fluid in Parkinson's disease patients. J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.08.955] [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: 11/15/2022]
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Pristovnik S, Strnad M, Vujanoviæ V, Pelcl T, Borovnik-Lesjak V. Effect of alcohol in blood on neurological outcome and survival of patients with combination of polytrauma and head injury. Crit Care 2015. [PMCID: PMC4472735 DOI: 10.1186/cc14522] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Stirk WA, Bálint P, Tarkowská D, Novák O, Maróti G, Ljung K, Turečková V, Strnad M, Ordög V, van Staden J. Effect of light on growth and endogenous hormones in Chlorella minutissima (Trebouxiophyceae). Plant Physiol Biochem 2014; 79:66-76. [PMID: 24685518 DOI: 10.1016/j.plaphy.2014.03.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [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: 01/29/2014] [Accepted: 03/04/2014] [Indexed: 05/28/2023]
Abstract
Plant growth regulators (PGRs) play an important role in mediating growth and stress responses in plants. Light influences PGRs concentrations in vascular plants. The effect of light on growth and endogenous PGR concentrations in microalgae was investigated in the present study. Chlorella minutissima MACC 360 was grown in 14:10 h light:dark (L:D), continuous dark (CD) and continuous dark with the addition of 5 g L(-1) glucose (CD + G) for 48 h. Cultures were synchronized in the L:D cultures, increasing in size during the light period and dividing during the dark period. C. minutissima cells did not increase in size or undergo cell division in CD cultures. In CD + G conditions, the cultures were no longer synchronized but did continue to increase in cell size and constantly underwent cell division although fewer cells divided than in the L:D cultures. Endogenous auxin and cytokinin concentrations increased and gibberellin concentrations decreased over time in the actively growing cultures (L:D and CD + G) but did not increase in the CD cultures. The largest increase in indole content was in the CD + G cultures while the L:D cultures had the largest cytokinin increase. Brassinosteroid concentrations decreased over time in all the cultures including those grown in CD conditions. Abscisic acid (ABA) concentrations were low and only increased in the CD cultures. These results show that endogenous PGRs were affected by the light regime and/or culture growth.
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Affiliation(s)
- W A Stirk
- Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal Pietermaritzburg, P/Bag X01, Scottsville 3209, South Africa.
| | - P Bálint
- Institute of Plant Biology, Faculty of Agricultural and Food Sciences, University of West Hungary, H-9200 Mosonmagyaróvár, Hungary
| | - D Tarkowská
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, CZ-783 71 Olomouc, Czech Republic
| | - O Novák
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, CZ-783 71 Olomouc, Czech Republic; Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-90183 Umeå, Sweden
| | - G Maróti
- Hungarian Academy of Sciences, Biological Research Centre, Institute of Biochemistry, Temeszári krt. 62, H-6726 Szeged, Hungary
| | - K Ljung
- Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-90183 Umeå, Sweden
| | - V Turečková
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, CZ-783 71 Olomouc, Czech Republic
| | - M Strnad
- Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, CZ-783 71 Olomouc, Czech Republic
| | - V Ordög
- Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal Pietermaritzburg, P/Bag X01, Scottsville 3209, South Africa; Institute of Plant Biology, Faculty of Agricultural and Food Sciences, University of West Hungary, H-9200 Mosonmagyaróvár, Hungary
| | - J van Staden
- Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal Pietermaritzburg, P/Bag X01, Scottsville 3209, South Africa
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Borovni Lesjak V, Strnad M, Vujanovic Popovic V, Pelcl T. Effect of blood alcohol level on outcome of patients with traumatic brain injury. Crit Care 2014. [PMCID: PMC4069533 DOI: 10.1186/cc13663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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10
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Stirk WA, Bálint P, Tarkowská D, Novák O, Strnad M, Ördög V, van Staden J. Hormone profiles in microalgae: gibberellins and brassinosteroids. Plant Physiol Biochem 2013; 70:348-53. [PMID: 23811778 DOI: 10.1016/j.plaphy.2013.05.037] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [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: 04/15/2013] [Accepted: 05/28/2013] [Indexed: 05/07/2023]
Abstract
Endogenous gibberellins and brassinosteroids were quantified in 24 axenic microalgae strains from the Chlorophyceae, Trebouxiophyceae, Ulvophyceae and Charophyceae microalgae strains after 4 days in culture. This is the first report of endogenous gibberellins being successfully detected in microalgae. Between 18 and 20 gibberellins were quantified in all strains with concentrations ranging from 342.7 pg mg(-1) DW in Raphidocelis subcapitata MACC 317-4746.1 pg mg(-)(1) DW in Scotiellopsis terrestris MACC 44. Slower growing strains (S. terrestris MACC 44, Gyoerffyana humicola MACC 334, Nautococcus mamillatus MACC 716 and Chlorococcum ellipsoideum MACC 712) exhibited the highest gibberellin contents while lowest levels of gibberellins were found in faster growing strains (R. subcapitata MACC 317 and Coelastrum excentrica MACC 504). In all strains, the active gibberellin detected in the highest concentration was GA6, the predominant intermediates were GA15 and GA53 and the main biosynthetic end products were GA13 and GA51. Gibberellin profiles were similar in all strains except for the presence/absence of GA12 and GA12ald. To date this is the second report of endogenous brassinosteroids in microalgae. Brassinosteroids were detected in all 24 strains with concentrations ranging from 117.3 pg mg(-)(1) DW in R. subcapitata MACC 317-977.8 pg mg(-)(1) DW in Klebsormidium flaccidum MACC 692. Two brassinosteroids, brassinolide and castasterone were determined in all the strains. Generally, brassinolide occurred in higher concentrations than castasterone.
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Affiliation(s)
- W A Stirk
- Research Centre for Plant Growth and Development, School of Life Sciences, University of KwaZulu-Natal Pietermaritzburg, P/Bag X01, Scottsville 3209, South Africa.
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Popovic VV, Pelcl T, Spindler M, Ketis ZK, Strnad M. Prehospital hyperoxemia does not influence the functional neurological outcome in polytraumatized patients with traumatic head injury. Crit Care 2013. [PMCID: PMC3642672 DOI: 10.1186/cc12223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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12
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Cuesta C, Novák O, Ordás RJ, Fernández B, Strnad M, Doležal K, Rodríguez A. Endogenous cytokinin profiles and their relationships to between-family differences during adventitious caulogenesis in Pinus pinea cotyledons. J Plant Physiol 2012; 169:1830-1837. [PMID: 22985989 DOI: 10.1016/j.jplph.2012.08.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2012] [Revised: 07/13/2012] [Accepted: 08/01/2012] [Indexed: 06/01/2023]
Abstract
Caulogenesis in mature stone pine (Pinus pinea L.) cotyledons is promoted, to varying degrees depending on genotype, by exogenous application of the cytokinin (CK) benzyladenine (BA). In the present study, endogenous CK profiles of cotyledons from open-pollinated plants and two families of stone pine with widely differing organogenic capacities were monitored during caulogenesis and linked to previously characterized BA uptake and induction phases. Changes in levels of free bases, ribosides, ribotides and glucosides of both isoprenoid and aromatic CKs were followed. Before BA application, the pool of endogenous CKs in all sets of cotyledons was dominated by isoprenoid ribotides, but 1h after BA exposure, aromatic CKs (mainly active free bases and ribosides of topolins) accounted for more than 90% of the pool. BA N-glucosides were also observed, levels of which (and topolins) rose from 2d until the end of the (six-day) culture period. The CK profiles of the two selected pine families also differed, although the general trends were similar. During the first 6h, levels of BA and meta-topolin were highest in cotyledons from the family with the strongest caulogenic responses, while levels of ribotides and aromatic glucosides were highest in cotyledons from the other family.
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Affiliation(s)
- C Cuesta
- Área de Fisiología Vegetal, Departamento Biología de Organismos y Sistemas, Instituto de Biotecnología de Asturias, Universidad de Oviedo, E-33071 Oviedo, Spain.
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Prokudina E, Havlíček L, Al-Maharik N, Lapčík O, Strnad M, Gruz J. Rapid UPLC–ESI–MS/MS method for the analysis of isoflavonoids and other phenylpropanoids. J Food Compost Anal 2012. [DOI: 10.1016/j.jfca.2011.12.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Franek F, Strnad M, Havlícek L, Siglerová V, Fismolová I, Eckschlager T. Diverse effects of the cyclin-dependent kinase inhibitor bohemine: Concentration- and time-dependent suppression or stimulation of hybridoma culture. Cytotechnology 2011; 36:117-23. [PMID: 19003322 DOI: 10.1023/a:1014020415912] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
An analog of aromatic cytokinins, the 2,6,9-trisubstituted purine derivative bohemine, was applied to cultures of mouse hybridoma cells in order to analyze its capacity of suppressing cell growth and maintaining or enhancing the production of monoclonal antibody. Addition of bohemine at concentrations in the range of1-10 muM resulted in a short-term arrest of growth and of monoclonal antibody production. The short-term suppression of cell functions was followed by a significant temporary increase of specific growth rate and of specific production rate. The steady-state viable cell density values, found in semicontinuous cultures, showed a certain stimulation of cell growth in the range of micromolar concentrations of bohemine, and inhibition of growth at 10 and 30 muM concentrations. The profiles of cell cycle phases indicated that hybridoma cells are retarded both at the G(1)/S boundary and at the G(2)/M boundary, depending on bohemine concentration. The existence of the sequence of events,from suppression to stimulation, suggests that bohemine probably modulates more than one regulatory pathway in the cell.
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Affiliation(s)
- F Franek
- Laboratory of Growth Regulators, Institute of Experimental Botany, Academy of Sciences of the Czech Republic, 10227, Praha 10, Czech Republic,
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15
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Todoric-Zivanovic B, Strnad M, Stamatovic D, Tukic L, Krtolica K, Tatomirovic Z, Djordjevic V, Bogdanovic A, Jankovic G, Magic Z. Frequency of BCR-ABL fusion transcripts in Serbian patients with chronic myeloid leukemia. J BUON 2011; 16:104-107. [PMID: 21674858] [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] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
PURPOSE The aim of this study was to analyze the occurrence of the most frequent BCR-ABL transcript variants (b3a2, b2a2 and e1a2) in Serbian patients with chronic myeloid leukemia (CML) and compare it with the occurrence reported in other populations. METHODS We analyzed peripheral blood and bone marrow samples of 136 Serbian patients with CML by RT-PCR and cytogenetic methods. RESULTS In 100 patients (73.5%) the b3a2 and in 34 (25%) the b2a2 forms of BCR-ABL were detected. One (0.75%) patient was BCR-ABL negative, but in lymphoblastic transformation he expressed the e1a2 [corrected] transcript of BCR-ABL. One (0.75%) patient displayed both b2a2 and b3a2 forms of BCR-ABL. Analysis of this group according to karyotype showed b3a2 predominance (79%) in patients with classic t(9;22); b2a2 was found in 20% and both b2a2 and b3a2 forms in 1%. In variant translocations b3a2 in 65% and b2a2 in 35% of the patients were detected. In contrast, the subgroup with normal karyotype expressed slight predominance of the b2a2 form (50%); b3a2 was found in 43% of the patients and one patient (7%) displayed e1a2. CONCLUSION Predominance of the b3a2 form in Serbian patients with CML is in concordance with other relevant investigations, conducted mostly on Caucasian ethnic groups, but in contrast to the study performed on the Mestizo ethnic group in Ecuador. Slight predominance of the b2a2 form was also noticed among the patients with normal karyotype.
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Trtkova K, Paskova L, Matijescukova N, Strnad M, Kolar Z. Binding of AR to SMRT/N-CoR complex and its co-operation with PSA promoter in prostate cancer cells treated with natural histone deacetylase inhibitor NaB. Neoplasma 2010; 57:406-14. [PMID: 20568894 DOI: 10.4149/neo_2010_05_406] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Signaling through the androgen receptor (AR) plays a critical role in prostate cancer progression. The AR is a classical nuclear receptor (NR) providing a link between signaling molecule and transcription response. Histone deacetylase inhibitors- (HDACI) have antiproliferative and proapoptotic effects on prostate cancer cells and their implication in silence AR signaling may have potential therapeutic use. We aimed to study the inhibitory effects of the corepressor SMRT (Silencing Mediator for Retinoid and Thyroid -hormone receptors) which forms a complex together with nuclear receptor corepressor (N-CoR) and with histone deacetylase 3 (HDAC3) on AR activity.The androgen-sensitive prostate cancer cell line LNCaP and androgen-insensitive prostate cancer cell line C4-2 both AR-positive, and androgen-insensitive DU145 and PC3 prostate cancer cell lines were treated with two HDACIs, sodium butyrate (NaB) and/or trichostatin A (TSA). We amplified immunoprecipitated DNA by conventional PCR and in the -following step we used the chromatin immunoprecipitation (ChIP) analysis coupled with quantitative PCR for monitoring NaB induced formation of AR-SMRT/N-CoR complex binding on the PSA promoter. The co-immunoprecipitation assay revealed increase in AR-SMRT formation in NaB treated cells. Simultaneously, the Western blot analysis showed a significant decrease in AR protein expression. In conclusion, the inhibitory effect of NaB on AR gene expression seems to be specific and unique for prostate cancer AR-positive cell lines and corresponds with its ability to stimulate AR-SMRT complex formation. We suggest that AR and SMRT/N-CoR corepressors may form a stable complex in vitro and NaB may facilitate the interaction between AR nuclear steroid receptor and SMRT corepressor prote.
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Affiliation(s)
- K Trtkova
- Department of Pathology, Palacky University, Olomouc, the Czech Republic.
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Jorda R, Reznickova E, Krystof V, Havlicek L, Strnad M. 500 A novel pyrazolo[4,3-d]pyrimidine inhibitor of cyclin-dependent kinases: antiproliferative and proapoptotic effects. EJC Suppl 2010. [DOI: 10.1016/s1359-6349(10)72207-2] [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: 11/30/2022] Open
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Sáenz L, Azpeitia A, Oropeza C, Jones LH, Fuchsova K, Spichal L, Strnad M. Endogenous cytokinins in Cocos nucifera L. in vitro cultures obtained from plumular explants. Plant Cell Rep 2010; 29:1227-1234. [PMID: 20690021 DOI: 10.1007/s00299-010-0906-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 07/13/2010] [Accepted: 07/22/2010] [Indexed: 05/29/2023]
Abstract
Auxin induces in vitro somatic embryogenesis in coconut plumular explants through callus formation. Embryogenic calli and non-embryogenic calli can be formed from the initial calli. Analysis of endogenous cytokinins showed the occurrence of cytokinins with aromatic and aliphatic side chains. Fourteen aliphatic cytokinins and four aromatic cytokinins were analysed in the three types of calli and all the cytokinins were found in each type, although some in larger proportions than others. The most abundant cytokinins in each type of callus were isopentenyladenine-9-glucoside, zeatin-9-glucoside, zeatin riboside, isopentenyladenine riboside, dihydrozeatin and dihydrozeatin riboside in decreasing order. Total cytokinin content was compared between the three types of calli, and it was found to be lower in embryogenic calli compared to non-embryogenic calli or initial calli. The same pattern was observed for individual cytokinins. When explants were cultured in media containing exogenously added cytokinins, the formation of embryogenic calli in the explants was reduced. When 8-azaadenine (an anticytokinin) was added the formation of embryogenic calli and somatic embryos was increased. These results suggest that the difference in somatic embryo formation capacity observed between embryogenic calli and non-embryogenic calli is related to their endogenous cytokinin contents.
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Affiliation(s)
- L Sáenz
- Centro de Investigación Científica de Yucatán, A.C., Calle 43 No. 130, Col. Chuburna de Hidalgo, C.P., 97200, Mérida, Yucatán, Mexico.
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Zovko Končić M, Kremer D, Gruz J, Strnad M, Biševac G, Kosalec I, Šamec D, Piljac-Žegarac J, Karlović K. Antioxidant and antimicrobial properties of Moltkia petraea (Tratt.) Griseb. flower, leaf and stem infusions. Food Chem Toxicol 2010; 48:1537-42. [DOI: 10.1016/j.fct.2010.03.021] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2009] [Revised: 02/19/2010] [Accepted: 03/15/2010] [Indexed: 01/25/2023]
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Šamec D, Gruz J, Strnad M, Kremer D, Kosalec I, Grubešić RJ, Karlović K, Lucic A, Piljac-Žegarac J. Antioxidant and antimicrobial properties of Teucrium arduini L. (Lamiaceae) flower and leaf infusions (Teucrium arduini L. antioxidant capacity). Food Chem Toxicol 2010; 48:113-9. [DOI: 10.1016/j.fct.2009.09.026] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2009] [Revised: 09/08/2009] [Accepted: 09/21/2009] [Indexed: 10/20/2022]
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Strnad M, Brajuskovic G, Strelic N, Todoric-Zivanovic B, Stamatovic D, Tatomirovic Z, Magic Z. Expression of programmed cell death proteins in patients with chronic myeloid leukemia. J BUON 2008; 13:403-408. [PMID: 18979557] [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] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
PURPOSE Chronic myelogenous leukemia (CML) is a malignant myeloproliferative disease developing out of pluripotent hematopoietic stem cells that contain the fusion Bcr-Abl gene. The mechanisms that lead to these changes at molecular level are still unknown as are the mechanisms that increase the proliferative capacity of these cells. Disorders that occur in the process of apoptosis represent one of the possible molecular mechanisms that bring about disease progress. In our study we analyzed the presence of mutated (mut) p53 gene and the amplification of Bax proteins in patients with CML. PATIENTS AND METHODS This study included 30 patients with CML (23 in chronic phase, 7 in blast transformation). Using immunohistochemistry with alkaline phosphatase / anti-alkaline phosphatase (APAAP) method we analyzed the expression of cell death proteins p53 and Bax in mononuclear bone marrow cells. Polymerase chain reaction single strand conformation polymorphism (PCR-SSCP) method was used to analyze the presence of mut p53 gene in mononuclear peripheral blood cells. Reverse transcription-polymerase chain reaction (RT-PCR) method was used to analyze the presence of Bcr-Abl in peripheral blood cells. RESULTS High expression of Bax protein was detected in all analyzed patients, but no significant differences were noticed among them. No mut p53 gene was detected in any of the analyzed samples. Bcr-Abl b3a2 protein form was detected in all patients with variant translocations. CONCLUSION Lack of mut p53 product in the peripheral blood and bone marrow cells in patients with CML suggests that this gene plays no important role in disease pathology. Increased level of Bax protein expression is an essential characteristic of CML cells but it is not related with the clinical stage of disease.
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MESH Headings
- Adolescent
- Adult
- Aged
- Alkaline Phosphatase/metabolism
- Apoptosis/genetics
- Blast Crisis
- Chromosome Aberrations
- Cytogenetic Analysis
- Female
- Fusion Proteins, bcr-abl/genetics
- Humans
- Immunoenzyme Techniques
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/genetics
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/metabolism
- Male
- Middle Aged
- Mutation/genetics
- Polymerase Chain Reaction
- Polymorphism, Single-Stranded Conformational
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Tumor Suppressor Protein p53/genetics
- Tumor Suppressor Protein p53/metabolism
- Young Adult
- bcl-2-Associated X Protein/genetics
- bcl-2-Associated X Protein/metabolism
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Affiliation(s)
- M Strnad
- Institute of Pathology, Military Medical Academy, Belgrade, Serbia.
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Stirk WA, Novák O, Václavíková K, Tarkowski P, Strnad M, van Staden J. Spatial and temporal changes in endogenous cytokinins in developing pea roots. Planta 2008; 227:1279-89. [PMID: 18270730 DOI: 10.1007/s00425-008-0699-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2007] [Accepted: 01/16/2008] [Indexed: 05/25/2023]
Abstract
Germination and seedling establishment follows a distinct pattern which is partly controlled by hormones. Roots have high levels of cytokinins. By quantifying the fluctuations in endogenous cytokinins over time, further insight may be gained into the role of cytokinins during germination and seedling establishment. Radicles were excised from sterile Pisum sativum L. seeds after 30 min and 5 h imbibition. Seedlings germinated on agar were harvested after 1, 3, 6 and 9 days. The roots were divided into the root tip, root free zone, secondary root zone and from day 6, the secondary roots. Samples were purified by various chromatographic methods and endogenous cytokinins detected by LC(+)ES-MS. Benzyladenine levels doubled after 5 h imbibition and then gradually decreased over time. Low concentrations of cis-Zeatin (cZ) type cytokinins were detected in the radicle after 30 min imbibition. After 5 h imbibition, cis-zeatin riboside-5'-monophosphate had greatly increased. The total cytokinin content of the roots increased over time with the ribotides being the predominant conjugates. From day 3 onwards, there was a gradual increase in the free bases, O-glucosides and their ribosylated forms. Mainly N ( 6 )-(2-isopentenyl)adenine (iP)-type cytokinins were detected in the root tip, whereas trans-zeatin- (tZ), dihyrozeatin- (DHZ) and iP-type cytokinins were found in the secondary roots and root zone. Cytokinin biosynthesis was only detected after day 6. Biosynthesis of iP and tZ derivatives was quite rapid, whereas biosynthesis of cZ derivatives remained at a low basal level. These fluctuations in cytokinin types and concentrations suggest the cytokinins may be synthesized from various pathways in pea roots.
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Affiliation(s)
- W A Stirk
- School of Biological and Conservation Sciences, University of KwaZulu-Natal Pietermaritzburg, Scottsville, 3209, South Africa.
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Brnic Z, Grgurevic-Dujmic E, Drinkovic I, Jankovic S, Marotti M, Mazuranic I, Miletic D, Stern-Padovan R, Stimac D, Strnad M. Initial results of national mammographic breast cancer screening program in Croatia. EJC Suppl 2008. [DOI: 10.1016/s1359-6349(08)70486-5] [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: 10/22/2022] Open
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Grmec Š, Strnad M, Cander D. 10: Vasopressine Improves Outcome in Out-of-Hospital Cardiopulmonary Resuscitation of Pulseless Electrical Activity in Patients With Blunt Trauma. Ann Emerg Med 2008. [DOI: 10.1016/j.annemergmed.2008.01.278] [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: 11/27/2022]
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Grmec S, Strnad M, Podgorsek D, Jus A. Comparison of the characteristics and outcome between patients suffering from out-of-hospital primary cardiac arrest and drowning victims with cardiac arrest: an analysis of variables based on the Utstein Style for Drowning. Crit Care 2008. [PMCID: PMC4088738 DOI: 10.1186/cc6588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
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Glew RH, Ayaz FA, Huang HS, Chuang LT, VanderJagt DJ, Strnad M. Evolution of fatty acids in medlar ( Mespilus germanica L.) mesocarp at different stages of ripening. Grasas y Aceites 2007. [DOI: 10.3989/gya.2002.v53.i3.328] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Kolarova H, Lenobel R, Kolar P, Strnad M. Sensitivity of different cell lines to phototoxic effect of disulfonated chloroaluminium phthalocyanine. Toxicol In Vitro 2007; 21:1304-6. [DOI: 10.1016/j.tiv.2007.08.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2006] [Accepted: 08/24/2007] [Indexed: 10/22/2022]
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Polasek O, Kolcic I, Voncina L, Strnad M, Vuletic S, Kern J. Breast, colon, and prostate screening in the adult population of Croatia: does rural origin matter? Rural Remote Health 2007; 7:749. [PMID: 17900222] [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: 05/17/2023] Open
Abstract
INTRODUCTION The aim of this study was to investigate the utilization of breast, colon and prostate cancer screening in the adult Croatian population in a period without national cancer screening programs, with a special interest in respondents' rural versus urban origin. METHODS Self-reported screening utilization was investigated in the Croatian Adult Health Survey, which collected health-related information from a representative sample of the adult Croatian population. Breast cancer screening was investigated in women aged over 40 years, while colon and prostate screening was investigated in respondents aged over 50 years. The data were analysed using binary logistic regression. RESULTS One in five women reported breast cancer screening uptake in the year preceding the survey (22.5%), while only 4.5% reported a colon screening. A total of 6.1% men reported colon screening, while 13.7% of men reported having a prostate cancer screening. Respondents with rural origin reported all sites screening utilization less frequently than those of urban origin (breast: 14.5% vs 27.4%; prostate: 9.6% vs 16.3%; colon-men: 5.7% vs 6.3%; colon-women: 3.6% vs 5.1%; respectively). Multivariable models indicated that people with higher socio-economic status more commonly reported breast and prostate cancer screening uptake. Access to health care was the only independent variable associated with colon cancer screening in men, and the strongest variable associated with colon cancer screening in women. Rural origin was associated only with lower odds of breast screening (adjusted odds ratio 0.60 [95% confidence interval 0.48-0.74]), while in the remaining models, rural origin was not a significant predictor for cancer screening uptake. CONCLUSIONS Opportunistic cancer screening uptake is low in the Croatian adult population, with existing socio-economic differences in breast and prostate screening, and their absence in colon cancer screening. Rural origin was significantly associated with breast screening, even after adjustment to socioeconomic status and problems in access to health care. Lack of rural origin significance in the other screening sites could be related to small sample sizes of people who reported opportunistic utilization. Overall, access to health care is the strongest cancer screening predictor, and this should have a prominent role in the development of a systematic cancer screening program on a national level.
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Affiliation(s)
- O Polasek
- Andrija Stampar School of Public Health, Medical School, University of Zagreb, Rockefellerova, Croatia.
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Kolarova H, Nevrelova P, Bajgar R, Jirova D, Kejlova K, Strnad M. In vitro photodynamic therapy on melanoma cell lines with phthalocyanine. Toxicol In Vitro 2007; 21:249-53. [PMID: 17092686 DOI: 10.1016/j.tiv.2006.09.020] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2006] [Revised: 09/08/2006] [Accepted: 09/25/2006] [Indexed: 11/15/2022]
Abstract
Photodynamic therapy (PDT) is a new treatment modality of tumours. The photochemical interactions of sensitizer, light, and molecular oxygen produce singlet oxygen and other forms of active oxygen, such as peroxide, hydroxyl radical and superoxid anion. Phthalocyanine ClAlPcS(2), belonging among the promising second generation of sensitizers, was tested as an inducer of photodamage. We report the production of reactive oxygen species (ROS) and the phototoxicity of ClAlPcS(2) assessed using G361 melanoma cells. A semiconductor laser (lambda=675nm, output power 21mW) was used as a source for evocation of the photodynamic effect. ROS generation and H(2)O(2) release after PDT on G361 cells were detected using probe CM-H(2)DCFDA and recorded by luminescence spectrometer. Viability studies show, that the optimum phototoxic effect tested on G361 melanoma cells was determined in the combination of laser dose of 25Jcm(-2) and phthalocyanine ClAlPcS(2) concentration of 5microg/ml. This combination of phthalocyanine concentration and corresponding radiation dose was lethal for melanoma cells.
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Affiliation(s)
- H Kolarova
- Department of Medical Biophysics, Palacky University, Olomouc, Czech Republic.
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Grmec Š, Kupnik D, Strnad M, Špindler M. Crit Care 2006; 10:P457. [DOI: 10.1186/cc4804] [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: 11/10/2022] Open
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Kolarova H, Macecek J, Nevrelova P, Huf M, Tomecka M, Bajgar R, Mosinger J, Strnad M. Photodynamic therapy with zinc-tetra(p-sulfophenyl)porphyrin bound to cyclodextrin induces single strand breaks of cellular DNA in G361 melanoma cells. Toxicol In Vitro 2005; 19:971-4. [PMID: 16061353 DOI: 10.1016/j.tiv.2005.06.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2005] [Accepted: 06/17/2005] [Indexed: 11/29/2022]
Abstract
The basis of photodynamic therapy (PDT) is the phototoxicity resulting from co-action of light, sensitizer and oxygen. In this study we demonstrate in vitro phototoxicity measurement on G361 cell lines using ZnTPPS(4) sensitizer bound to cyclodextrin hpbetaCD. We have proved its photodamage effect on cancer cell lines in the visible region of spectrum. We used the halogen lamp (24V/250W) as a source of radiation. After 24h incubation of cell cultures with 10 microM ZnTPPS(4) and 1mM cyclodextrine hpbetaCD, the cells were irradiated for 7.5 min at the total irradiation dose of 12.5 Jcm(-2). Analysis of DNA damage in the cell line after PDT was proved by comet assay and using inversion fluorescent microscope with image analysis. This treatment method gave rise to DNA damage. The used radiation dose of visible light in the absence of sensitizers does not induce DNA breaks in tumour cells. In conclusion, binding of ZnTPPS(4) sensitizer to cyclodextrin hpbetaCD may improve the efficacy of PDT for the treatment of malign melanoma.
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Affiliation(s)
- H Kolarova
- Department of Biophysics, Faculty of Medicine, Laboratory of Growth Regulators, Palacky University, Hnevotinska 3, 775 15 Olomouc, Czech Republic.
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Krystof V, McNae IW, Walkinshaw MD, Fischer PM, Müller P, Vojtesek B, Orság M, Havlícek L, Strnad M. Antiproliferative activity of olomoucine II, a novel 2,6,9-trisubstituted purine cyclin-dependent kinase inhibitor. Cell Mol Life Sci 2005; 62:1763-71. [PMID: 16003486 DOI: 10.1007/s00018-005-5185-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The study describes the protein kinase selectivity profile, as well as the binding mode of olomoucine II in the catalytic cleft of CDK2, as determined from cocrystal analysis. Apart from the main cell cycle-regulating kinase CDK2, olomoucine II exerts specificity for CDK7 and CDK9, with important functions in the regulation of RNA transcription. In vitro anticancer activity of the inhibitor in a panel of tumor cell lines shows a wide potency range with a slight preference for cells harboring a wild-type p53 gene. Cell-based assays confirmed activation of p53 protein levels and events leading to accumulation of p21(WAF1). Additionally, in olomoucine II-treated cells, Mdm2 was found to form a complex with the ribosomal protein L11, which inhibits Mdm2 ubiquitin ligase function. We conclude that perturbations in RNA synthesis may lead to activation of p53 and that this contributes to the antiproliferative potency of cyclindependent kinase inhibitors.
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Affiliation(s)
- V Krystof
- Laboratory of Growth Regulators, Faculty of Science, Palacký University & Institute of Experimental Botany AS CR, Slechtitelů 11, 783 71, Olomouc, The Czech Republic
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Tylsarová V, Drlík L, Strnad M. [Erythema nodosum]. Cas Lek Cesk 2005; 144:760-1; discussion 762. [PMID: 16335704] [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] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The authors describe a case of 41-year-old patient with erythema nodosum as a manifestation of colitis ulcerosa. They stress the importance of complex look at this skin disease, which can be caused by many factors. Non-specific intestinal inflammation can be a cause of the erythema nodosum in 1-2%.
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Affiliation(s)
- V Tylsarová
- Dermatovenerologické oddĕlení Nemocnice Sumperk.
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Labar B, Rudan I, Ivankovic D, Biloglav Z, Mrsic M, Strnad M, Fucic A, Znaor A, Bradic T, Campbell H. Haematological malignancies in childhood in Croatia: investigating the theories of depleted uranium, chemical plant damage and 'population mixing'. Eur J Epidemiol 2004; 19:55-60. [PMID: 15012023 DOI: 10.1023/b:ejep.0000013400.65418.60] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Some of potential causes proposed to explain the reported increase of haematological malignancies in childhood during or after the war period in several countries include depleted uranium, chemical pollution and population mixing theory. The aim of this study was to define the population of Croatian children aged 0-14 years who were potentially exposed to each of those risks during the war and to investigate any possible association between the exposure and the incidence of haematological malignancies. The authors analyzed the data reported by the Cancer Registry of Croatia during the pre-war period (1986-1990), war period (1991-1995) and post-war period (1996-1999). In the group of 10 counties potentially exposed to depleted uranium and two counties where chemical war damage occurred, no significant difference in incidence of the studied haematological malignancies was noted in comparison to pre-war period. The incidence of lymphatic leukaemia significantly increased in four counties where population mixing had occurred during the war period, supporting the 'mixing theory'. In those counties, the incidence of Hodgkin's lymphoma decreased during and after the war. In Croatia as a whole, decreases in incidence of myeloid leukaemias during war and non-Hodgkin lymphoma after the war were noted.
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MESH Headings
- Adult
- Aged
- Aged, 80 and over
- Blood Cell Count
- Croatia/epidemiology
- Environmental Exposure/adverse effects
- Female
- Hazardous Substances/toxicity
- Hematologic Neoplasms/chemically induced
- Hematologic Neoplasms/diagnostic imaging
- Hematologic Neoplasms/epidemiology
- Humans
- Incidence
- Leukemia, Lymphoid/chemically induced
- Leukemia, Lymphoid/diagnostic imaging
- Leukemia, Lymphoid/epidemiology
- Leukemia, Myeloid/chemically induced
- Leukemia, Myeloid/diagnostic imaging
- Leukemia, Myeloid/epidemiology
- Lymphoma, Non-Hodgkin/chemically induced
- Lymphoma, Non-Hodgkin/diagnostic imaging
- Lymphoma, Non-Hodgkin/epidemiology
- Male
- Middle Aged
- Population Dynamics
- Prevalence
- Radioactive Pollutants/toxicity
- Radionuclide Imaging
- Registries
- Uranium/chemistry
- Uranium/toxicity
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Affiliation(s)
- B Labar
- Faculty of Medicine, University of Zagreb, Croatia.
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Knillová J, Bouchal J, Hlobilková A, Strnad M, Kolár Z. Synergic effects of the cyclin-dependent kinase (CDK) inhibitor olomoucine and androgen-antagonist bicalutamide on prostatic cancer cell lines. Neoplasma 2004; 51:358-67. [PMID: 15640940] [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: 05/01/2023]
Abstract
Currently, mechanisms leading to both apoptosis induction and the development of hormone-independence of prostate carcinoma cells are intensively studied. Attention is also given to the possibility of restoring cell sensitivity to hormone-antagonists. The present study focuses on the effect of the combined synthetic cyclin-dependent kinase [CDK] inhibitor, olomoucine and the antiandrogen bicalutamide on hormone-insensitive (DU-145) and hormone-sensitive (LNCaP) prostate cancer cell lines. In both cell lines reduction in cell viability was significantly higher when olomoucine and bicalutamide were applied in combination when compared to separate application of both these drugs. The setting of optimal concentrations for both substances was important for the final effect on both cell lines. The proliferation arrest was accompanied by a decrease in cyclin D1 expression and the activation of p21Waf1/Cip1 and p27Kip1 pathways in both cell lines. Contrary to the previously described effect of 200 microM olomoucine, weak AR induction after treatment with effective concentrations of olomoucine was not seen in the hormone- insensitive cell line DU-145. The related reaction of DU-145 and LNCaP cell lines to treatment with combined olomoucine and bicalutamide likely provides evidence that the inhibitory effect of bicalutamide may not only be associated with its antiandrogenic properties. The tested substances probably influence different regulatory pathways and these have co-operative impact on the cell cycle outcome. Understanding antitumor and antihormone actions of both agents is essential for the development of novel therapeutic schemes integrating substances with different action. Our results show that the combination of synthetic CDK inhibitors and hormone- antagonists may be one of a number of possible alternatives.
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Affiliation(s)
- J Knillová
- Institute of Pathology, Laboratory of Molecular Pathology, Faculty of Medicine, Palacky University, CZ-77515 Olomouc, Czech Republic
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Affiliation(s)
- E Prinsen
- Department of Biology, University of Antwerp, Wilrijk, Belgium
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Abstract
We report the phototoxicity of meso-tetrakis(4-sulphonatophenyl)porphine (TPPS4) and zinc metallocomplex (ZnTPPS4) sensitizers in the presence or absence of 2-hydroxypropyl-beta-cyclodextrin (HP-beta-CD) on G361human melanoma cells. Morphological changes in cell cultures have been evaluated using inversion fluorescent microscope and image analysis. Viability of cells was determined by means of molecular probes for fluorescence microscopy (LIVE/DEAD kit- double staining with Calcein AM and Ethidium Homodimer). The quantitative changes of cell viability in relation to sensitizers concentrations and irradiation doses were proved by fluorometric measurement with fluoroscan Ascent. We found that the most effective sensitizer is ZnTPPS4 bound to HP-beta-CD, since the IC50 value was 12.5 g/ml at the dose of light radiation of 10 J/cm2.
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Affiliation(s)
- H Kolárová
- Department of Biophysics, Faculty of Medicine, Laboratory of Growth Regulators, Palacky University, Hnívotínská 3, 775 15 Olomouc, Czech Republic.
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Kolár Z, Murray PG, Madarova J, Lukesova M, Hlobilkova A, Riháková P, Flavell P, Strnad M, Student V, Vojtesek B. Nuclear receptors in early hormone refractory prostate cancer and their relationship to apoptosis-related proteins. Neoplasma 2002; 49:172-7. [PMID: 12098003] [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: 02/25/2023]
Abstract
The expression of several genes involved in apoptosis and cell cycle control can be regulated by steroid hormones and related agents via their nuclear receptors. Members of the bcl-2 gene family participate in the regulation of apoptosis in a diverse range of cell types and are implicated in the development of hormone refractory prostate cancer and resistance to anti-cancer therapy. The aim of this study, therefore, was to examine the expression of several nuclear receptors in relation to the expression of apoptosis and cell cycle related proteins in a series of patients with early hormone refractory prostate cancer. Analysis of protein expression revealed only a weak association between Bcl-2 and AR. Bax positivity and p27Kip1 expression were significantly more frequent in the AR-positive tumors, whereas RXRbeta expression was more frequently observed in the AR-negative group. The expression of AR, Bax and p27Kip1 was inversely related, and the expression of RXRbeta directly related, to Gleason pattern status. These results suggest that the immunophenotype of early hormone refractory prostate cancer may be different to that seen in more advanced stage disease. Androgen withdrawal therapy employing anti-androgens may elicit different signalling pathways that may be dependent on ARstatus and ARsensitivity.
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Affiliation(s)
- Z Kolár
- Laborator of Molecular Pathology; Faculty of Medicine, Palacky University and Faculty Hospital in Olomouc, Olomouc, 77515 Czech Republic.
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Mad'arová J, Lukesová M, Hlobilková A, Strnad M, Vojtesek B, Lenobel R, Hajdúch M, Murray PG, Perera S, Kolár Z. Synthetic inhibitors of CDKs induce different responses in androgen sensitive and androgen insensitive prostatic cancer cell lines. Mol Pathol 2002; 55:227-34. [PMID: 12147712 PMCID: PMC1187184 DOI: 10.1136/mp.55.4.227] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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] [Accepted: 12/04/2001] [Indexed: 11/04/2022]
Abstract
AIMS Because of the high prevalence of prostatic cancer and the limitations of its treatment, enormous effort has been put into the development of new therapeutic modalities. One potential tool is the use of cyclin dependent kinase (CDK) inhibitors, which are based on the trisubstituted derivatives of purine. The aim of this study was to analyse alterations of the regulatory pathways in both androgen sensitive and androgen insensitive prostatic cancer cell lines (LNCaP and DU-145, respectively) after blockage of the cell cycle by the synthetic CDK inhibitors, olomoucine and bohemine. METHODS The effects of olomoucine and bohemine were studied on the following parameters: (1) cell proliferation, by measurement of DNA content; (2) viability, by the MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) and/or XTT (2,3-bis[2-methoxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxanilide) test; and (3) the expression of p53, pRB, Bcl-2, Bax, p16, p21, p27, cyclins A, B, D1, E, p34(cdc2), and the androgen receptor (AR), by western blot analysis. RESULTS Both olomoucine and bohemine were potent inhibitors of growth and viability; however, bohemine was two to three times more effective than olomoucine. The sensitivity of LNCaP cells to both agents was significantly higher. After treatment, both cell lines revealed quite different spectra of protein expression. CONCLUSIONS These results indicate the existence of specific cell cycle regulating pathways in both cell lines, which may be associated with both p53 and AR status. CDK inhibitors exhibited valuable secondary effects on the expression of numerous regulators and thus may modulate the responsiveness of tumour cells to treatment, including treatment with hormone antagonists.
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Affiliation(s)
- J Mad'arová
- Laboratory of Molecular Pathology, Faculty of Medicine, Centre of Molecular Biology and Medicine, Palacký University, Hnevotínská 3, CZ-77515 Olomouc, Czech Republic
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Vermeulen K, Strnad M, Krystof V, Havlícek L, Van der Aa A, Lenjou M, Nijs G, Rodrigus I, Stockman B, van Onckelen H, Van Bockstaele DR, Berneman ZN. Antiproliferative effect of plant cytokinin analogues with an inhibitory activity on cyclin-dependent kinases. Leukemia 2002; 16:299-305. [PMID: 11896531 DOI: 10.1038/sj.leu.2402378] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2001] [Accepted: 11/14/2001] [Indexed: 11/09/2022]
Abstract
In this study, analogues of olomoucine, a previously described plant cytokinin analogue with cyclin-dependent kinase (CDK) inhibitory activity, were investigated for effect on CDK1 and CDK2 and for effect on cell proliferation. Eight new compounds exhibit stronger inhibitory activity on CDK1 and CDK2 and on cell proliferation than olomoucine. Some active compounds showed low inhibition of proliferation of normal myeloid growth. Improvement of inhibitory activity of known compounds with a C6-benzylamino group was brought about by substitution with one hydroxyl. Also, new C2 substituents associated with inhibitory activity on CDK and on cell proliferation are described. There was a significant correlation between effect on CDK and antiproliferative effect on the KG1 and Molt3 cell lines and on primary human lymphocytes, strongly suggesting that at least part of the antiproliferative effect of cytokinin analogues was due to inhibition of CDK activity. Cytokinin analogues induced apoptosis in a time- and concentration-dependent manner and changes in cell cycle distribution. The antiproliferative and pro-apoptotic effects of plant cytokinin analogues suggest that they are a new class of cytostatic agents and that they may find an application in the chemotherapy of cancer.
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Affiliation(s)
- K Vermeulen
- Laboratory of Experimental Hematology, University of Antwerp, Antwerp University Hospital, Edegem, Belgium
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Kotala V, Horky M, Uldrijan S, Strnad M, Vojtesek B. Rapid Onset of Nucleolar Segregation Followed by DNA Fragmentation in Roscovitine-Treated MCF-7 Cells Supports Its Pro-Apoptotic Potential. ScientificWorldJournal 2001; 1:58. [PMID: 30147526 PMCID: PMC6084404 DOI: 10.1100/tsw.2001.226] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Affiliation(s)
- V Kotala
- Masaryk Memorial Cancer Institute, Brno, Czech Republic
| | - M Horky
- Dept. of Pathological Physiology, Masaryk University, Brno, Czech Republic
| | - S Uldrijan
- Masaryk Memorial Cancer Institute, Brno, Czech Republic
| | - M Strnad
- Lab. of Growth Regulators, University of Palacky, Olomouc, Czech Republic
| | - B Vojtesek
- Masaryk Memorial Cancer Institute, Brno, Czech Republic
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Lenobel R, Havli L, Kryscaron PV, Otyepka M, Strnad M. Olomoucine II, New Effective CDK Inhibitor with Strong Cytotoxic Properties. ScientificWorldJournal 2001; 1:128. [PMID: 30147607 PMCID: PMC6084208 DOI: 10.1100/tsw.2001.227] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Affiliation(s)
- R Lenobel
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - L Havli
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - P V Kryscaron
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - M Otyepka
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - M Strnad
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
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Werner T, Motyka V, Strnad M, Schmülling T. Regulation of plant growth by cytokinin. Proc Natl Acad Sci U S A 2001; 98:10487-92. [PMID: 11504909 PMCID: PMC56987 DOI: 10.1073/pnas.171304098] [Citation(s) in RCA: 544] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2001] [Accepted: 06/15/2001] [Indexed: 11/18/2022] Open
Abstract
Cytokinins are a class of plant-specific hormones that play a central role during the cell cycle and influence numerous developmental programs. Because of the lack of biosynthetic and signaling mutants, the regulatory roles of cytokinins are not well understood. We genetically engineered cytokinin oxidase expression in transgenic tobacco plants to reduce their endogenous cytokinin content. Cytokinin-deficient plants developed stunted shoots with smaller apical meristems. The plastochrone was prolonged, and leaf cell production was only 3-4% that of wild type, indicating an absolute requirement of cytokinins for leaf growth. In contrast, root meristems of transgenic plants were enlarged and gave rise to faster growing and more branched roots. These results suggest that cytokinins are an important regulatory factor of plant meristem activity and morphogenesis, with opposing roles in shoots and roots.
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Affiliation(s)
- T Werner
- Centre for Plant Molecular Biology (ZMBP)/Allgemeine Genetik, Universität Tübingen, Auf der Morgenstelle 28, D-72076 Tübingen, Germany
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Kotala V, Uldrijan S, Horky M, Trbusek M, Strnad M, Vojtesek B. Potent induction of wild-type p53-dependent transcription in tumour cells by a synthetic inhibitor of cyclin-dependent kinases. Cell Mol Life Sci 2001; 58:1333-9. [PMID: 11577989 DOI: 10.1007/pl00000944] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Activation of the p53 tumour suppressor protein by distinct forms of stress leads to inhibition of cellular proliferation by inducing cell cycle arrest or apoptosis. The cyclin-dependent kinase inhibitor roscovitine has been shown to induce nuclear accumulation of wild-type p53 in human untransformed and tumour-derived cells. We analyzed the response of different human tumour cell lines to roscovitine treatment with respect to their p53 status. Striking induction of wild-type p53 protein and dramatic enhancement of p53-dependent transcription, coinciding with p21WAF1 induction, was observed in wildtype, but not mutant, p53-bearing tumour cells after treatment with roscovitine. The transcriptional activity of p53 was substantially higher in roscovitine-treated cells than in cells irradiated with ultraviolet C or ionizing radiation, even though all these agents induced a similar amount of p53 accumulation. These results highlight the therapeutic potential of roscovitine as an anticancer drug, especially in tumours retaining a functional wild-type p53 pathway.
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Affiliation(s)
- V Kotala
- Department of Experimental Oncology, Masaryk Memorial Cancer Institute, Brno, Czech Republic
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Oreskovic S, Majdak P, Strnad M, Babic S. Opinion of patients on the quality of hospital care. Natl Med J India 2001; 14:246-7. [PMID: 11547534] [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: 02/21/2023]
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Trávnícek Z, Malon M, Sindelál Z, Dolezal K, Rolcík J, Krystof V, Strnad M, Marek J. Preparation, physicochemical properties and biological activity of copper(II) complexes with 6-(2-chlorobenzylamino)purine (HL1) or 6-(3-chlorobenzylamino)purine (HL2). The single-crystal X-ray structure of. J Inorg Biochem 2001; 84:23-32. [PMID: 11330478 DOI: 10.1016/s0162-0134(00)00218-x] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Copper(II) complexes of 6-(2-chlorobenzylamino)purine (HL1) and 6-(3-chlorobenzylamino)purine (HL2), respectively, were prepared. Depending on the pH of the medium and the molar ratio of reactants the following mononuclear (trigonal-bipyramidal) and dinuclear (octahedral, trigonal-bipyramidal or tetrahedral) complexes were isolated: [Cu2(mu-HL1)2(mu-Cl2)2(HL1)2Cl2] (1a,b), [Cu2(mu-Cl)2(mu-L1)2(H2O)2] (2a), [Cu2(mu-Cl)2(mu-L2)2(H2O)2] (2b), [Cu(H+L2)2Cl3]Cl.H2O (3a,b), [Cu2(mu-Cl)2(HL1)2Cl2] (4a), and [Cu2(mu-Cl)2(HL2)2Cl2] (4b). The compounds were characterized by elemental analyses, electronic, infrared and mass (FAB+, ES+) spectral data, magnetic susceptibility temperature dependence measurements and molar conductivity data. An X-ray single-crystal structural analysis of [Cu(H+L2)2Cl3]Cl.2H2O (3b) showed that the Cu2+ ion is penta-coordinated by three chloride ions and by two H+L2 ligands. Thus, the Cu2+ ion adopts a distorted trigonal bipyramidal coordination geometry with the protonated H+L2 ligands coordinated in trans apical positions, while the three chloride ions are situated in an equatorial plane. The cytotoxic activity of the complexes was determined by a calcein AM assay. Mouse melanoma cell line B16-FO, human malignant melanoma cell line G361, human osteogenic sarcoma cell line HOS and human breast adenocarcinoma cell line MCF7 were used. IC50 values, the drug concentrations lethal to 50% of the tumor cells, were estimated. One of the important mechanisms responsible for the cytotoxicity of cytokinin-derived compounds, the inhibition of cyclin-dependent kinases by the studied complexes, was also determined.
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Affiliation(s)
- Z Trávnícek
- Department of Inorganic and Physical Chemistry, Palacký University, Olomouc, Czech Republic.
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Strnad M, Havlia L, Binarova P, Kryscaron V, Hanuscaron J, Siglerova V, Boumlgre L, Heberle-Bors E. Cyclin-Dependent Kinase Inhibitors Induce Apoptosis in Plant Cells. ScientificWorldJournal 2001; 1:126. [PMID: 30147605 PMCID: PMC6084646 DOI: 10.1100/tsw.2001.229] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Affiliation(s)
- M Strnad
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - L Havlia
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - P Binarova
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - V Kryscaron
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - J Hanuscaron
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - V Siglerova
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - L Boumlgre
- Vienna Biocenter, Institute of Microbiology and Genetics, Vienna, Austria
| | - E Heberle-Bors
- Vienna Biocenter, Institute of Microbiology and Genetics, Vienna, Austria
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Vorko-Jović A, Rimac M, Jović F, Strnad M, Solaja D. Epidemiological investigation of school-related injuries in Koprivnica County, Croatia. Croat Med J 2001; 42:58-63. [PMID: 11172657] [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: 02/18/2023] Open
Abstract
AIM To assess the prevalence of injuries in elementary schools and determine specific risk groups of school-age children. METHODS According to the 1991 census, there were 6,398 children between 7 and 14 years of age in the study area of the former Koprivnica district. During the 1992-1997 period, 354 children were injured in school. The registration of injured children was performed via structured questionnaires filled out at the emergency clinic and outpatient surgical clinic of the General Hospital in Koprivnica. The mechanism of accident and activities preceding it were categorized according to the Nordic Medico-Statistical Committee classification. Chi-square test was used to determine groups of school children at specific risk and a classification tree was made on the basis of minimum entropy values for age, sex, activity, and mechanism of injury. RESULTS The highest injury rate of was recorded in 12-year-olds (21.7%). Upper extremities were most common site of injury (52.8%), whereas the most common type of injury was contusion (45.2%). The rate of head injuries was 3.2 times higher in younger (aged 7-10) children, whereas the rate of sports injuries was 3.5-fold higher in older (aged 11-14) children (p=0.001). Entropy classification revealed younger school-age children to be at the highest risk of contusion due to a blow from a ball, an object, or contact during sports activities. CONCLUSION In Koprivnica County, most school-related injuries occurred during sport activities (42%) and play during recess (55%), with specific differences in age and sex.
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Affiliation(s)
- A Vorko-Jović
- Department of Epidemiology, Statistics, and Informatics, Andrija Stampar School of Public Health, Zagreb University School of Medicine, Rockeffellerova 4, 10000 Zagreb, Croatia.
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Kotala V, Horky M, Uldrijan S, Strnad M, Vojtesek B. Rapid onset of nucleolar segregation followed by DNA fragmentation in roscovitine-treated MCF-7 cells supports its pro-apoptotic potential. ScientificWorldJournal 2001. [DOI: 10.1100/tsw.2001.23.226] [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: 11/17/2022] Open
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