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Soudek P, Langhansová L, Dvořáková M, Revutska A, Petrová Š, Hirnerová A, Bouček J, Trakal L, Hošek P, Soukupová M. The impact of the application of compochar on soil moisture, stress, yield and nutritional properties of legumes under drought stress. Sci Total Environ 2024; 914:169914. [PMID: 38185168 DOI: 10.1016/j.scitotenv.2024.169914] [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: 04/20/2023] [Revised: 01/02/2024] [Accepted: 01/02/2024] [Indexed: 01/09/2024]
Abstract
Nowadays, when climate change is becoming more and more evident, drought stress plays a very important role, including in agriculture. The increasing number of years with extreme temperatures in the Czech Republic has a negative impact on agricultural production, among other things. Therefore, ways are being sought to reduce these negative impacts. One of them may be the use of compochar (a mixture of compost and biochar) to improve water retention in the soil. The effect of compochar addition on soil properties and crop yield was tested under conditions simulating severe drought stress (greenhouse experiments) compared to normal conditions (field experiments). The aim was to find the most suitable ratio of compochar addition that would reduce the negative effects of drought stress on the yield and quality of peas and beans. Tested soil was only able to retain water between 0.03 and 0.18 cm3/cm3, while the compochar itself retained between 0.12 and 0.32 cm3 cm-3. Three substrate variants were tested by varying the amount of compochar (10, 30 and 50 % v/v) in the soil, and all three substrates showed a similar water content between 0.03 and 0.21 cm3 cm-3 depending on the planted crop and week of cultivation. No apparent stress was observed in crops planted in 100 % compochar. Nevertheless, in general, the trend of chlorophyll a/b ratio increased with increasing amounts of compochar in the soil, indicating stress. Yield increased by approximately 50 % for both test crops when 30 % compochar was used as substrate. The flavonoid content in beans was between 410 and 500 μg CE g-1 DW and in peas was approximately 300 μg CE g-1 DW. The results showed that the utilization of compochar had no effect on either total phenol content, flavonoid content or antioxidant capacity. The combination of compochar with soil (30 %) was found to positively affect the (i) soil moisture, (ii) crop yield, and (iii) nutritional properties of peas and beans and (iv) the ability of plants to withstand drought stress.
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Affiliation(s)
- P Soudek
- Institute of Experimental Botany of the Czech Academy of Sciences, Laboratory of Plant Biotechnologies, Rozvojová 263, 165 02 Prague 6, Lysolaje, Czech Republic.
| | - L Langhansová
- Institute of Experimental Botany of the Czech Academy of Sciences, Laboratory of Plant Biotechnologies, Rozvojová 263, 165 02 Prague 6, Lysolaje, Czech Republic
| | - M Dvořáková
- Institute of Experimental Botany of the Czech Academy of Sciences, Laboratory of Plant Biotechnologies, Rozvojová 263, 165 02 Prague 6, Lysolaje, Czech Republic
| | - A Revutska
- Institute of Experimental Botany of the Czech Academy of Sciences, Laboratory of Biologically Active Compounds, Rozvojová 263, 165 02 Prague 6, Lysolaje, Czech Republic
| | - Š Petrová
- Institute of Experimental Botany of the Czech Academy of Sciences, Laboratory of Plant Biotechnologies, Rozvojová 263, 165 02 Prague 6, Lysolaje, Czech Republic
| | - A Hirnerová
- Institute of Experimental Botany of the Czech Academy of Sciences, Laboratory of Plant Biotechnologies, Rozvojová 263, 165 02 Prague 6, Lysolaje, Czech Republic
| | - J Bouček
- Czech University of Life Sciences Prague, Department of Environmental Geosciences, Faculty of Environmental Sciences, 165 00 Prague 6, Czech Republic
| | - L Trakal
- Czech University of Life Sciences Prague, Department of Environmental Geosciences, Faculty of Environmental Sciences, 165 00 Prague 6, Czech Republic
| | - P Hošek
- Institute of Experimental Botany of the Czech Academy of Sciences, Laboratory of Hormonal Regulations in Plants, Rozvojová 263, 165 02 Prague 6, Lysolaje, Czech Republic
| | - M Soukupová
- Czech University of Live Science Prague, Faculty of Agrobiology, Food and Natural Resources, Department of Horticulture, Kamýcká 129, 165 00 Prague 6, Czech Republic
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Koňáriková K, Girašková GM, Žitňanová I, Dvořáková M, Rollerová E, Scsuková S, Bizik J, Janubová M, Muchová J. Biological analyses of the effects of TiO2 and PEG-b-PLA nanoparticles on three-dimensional spheroid-based tumor. Physiol Res 2023; 72:S257-S266. [PMID: 37888969 PMCID: PMC10669953 DOI: 10.33549/physiolres.935152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 06/27/2023] [Indexed: 12/01/2023] Open
Abstract
The aim of our study was to monitor the antiproliferative/ cytotoxic and genotoxic effects of both, poly(ethylene glycol)-block-poly(lactic acid) (PEG-b-PLA) and titanium dioxide (TiO2) nanoparticles on the tumor (HT-29, MCF-7, U118MG) and healthy (HEK-293T) cell lines during 2D cultivation and during cultivation in the spheroid form (3D cultivation). Cells or spheroids were cultivated with nanoparticles (0.01, 0.1, 1, 10, 50, and 100 ?g/ml) for 72 hours. The cytotoxic effect was determined by the MTT test and the genotoxic effect by the comet assay. We found that 2D cultivation of tumor cell lines with PEG-b-PLA and TiO2 nanoparticles had an anti-proliferative effect on human colon cancer cell line HT-29, human breast cancer cell line MCF-7, human glioma cell line U-118MG during 72h cultivation, but not on control/healthy HEK-293T cells. At the concentrations used, the tested nanoparticles caused no cytotoxic effect on tumor cell lines. Nanoparticles PEG-b-PLA induced significant damage to DNA in HT-29 and MCF-7 cells, while TiO2 nanoparticles in MCF-7 and U-118MG cells. Only PEG-b-PLA nanoparticles caused cytotoxic (IC50 = 7 mikrog/ml) and genotoxic effects on the healthy cell line HEK-293T after 72h cultivation. The cells which were cultivated in spheroid forms were more sensitive to both types of nanoparticles. After 72h cultivation, we observed the cytotoxic effect on both, the tumor and healthy cell lines.
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Affiliation(s)
- K Koňáriková
- Institute of Medical Chemistry, Biochemistry and Clinical Biochemistry, Faculty of Medicine, Comenius University, Bratislava, Slovak Republic.
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Dvořáková M, Svobodová L, Rucki M, Ševčík V, Hošíková B, Chrz J, Bendová H, Kejlová K, Očadlíková D, Malý M, Kolářová H, Mannerström M, Kanďárová H, Jírová D. The Safety Assessment of Cosmetic Perfumes by Using In Chemico and In Vitro Methods in Combination with GC-MS/MS Analysis. Altern Lab Anim 2023; 51:224-248. [PMID: 37377062 DOI: 10.1177/02611929231184635] [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] [Indexed: 06/29/2023]
Abstract
Animal testing has been prohibited for the safety assessment of cosmetic ingredients or finished products. Thus, alternative non-animal methods, followed by confirmatory clinical studies on human volunteers, should be used as the sole legally acceptable approach within the EU. The safety assessment of cosmetic products requires the involvement of multiple scientific disciplines, including analytical chemistry and biomedicine, as well as in chemico, in vitro and in silico toxicology. Recent data suggest that fragrance components may exert multiple adverse biological effects, e.g. cytotoxicity, skin sensitisation, (photo)genotoxicity, mutagenicity, reprotoxicity and endocrine disruption. Therefore, a pilot study was conducted with selected samples of fragrance-based products, such as deodorant, eau de toilette and eau de parfum, with the aim of integrating results from a number of alternative non-animal methods suitable for the detection of the following toxicological endpoints: cytotoxicity (with 3T3 Balb/c fibroblasts); skin sensitisation potential (in chemico method, DPRA); skin sensitisation potential (LuSens in vitro method, based on human keratinocytes); genotoxicity potential (in vitro Comet assay with 3T3 Balb/c cells); and endocrine disruption (in vitro YES/YAS assay). The presence of twenty-four specific known allergens in the products was determined by using GC-MS/MS. The strategies for estimation of the NOAEL of a mixture of allergens, which were proposed by the Scientific Committee on Consumer Products in their 'Opinion on Tea tree oil' document and by the Norwegian Food Safety Authority in their 'Risk Profile of Tea tree oil' report, were used as models for the NOAEL estimation of the mixtures of allergens that were identified in the individual samples tested in this study.
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Affiliation(s)
- Markéta Dvořáková
- Centre of Toxicology and Health Safety, National Institute of Public Health, Prague, Czech Republic
- Third Faculty of Medicine, Charles University in Prague, Prague, Czech Republic
| | - Lada Svobodová
- Centre of Toxicology and Health Safety, National Institute of Public Health, Prague, Czech Republic
- Department of Medical Biophysics, Faculty of Medicine and Dentistry, Palacký University, Olomouc, Czech Republic
| | - Marian Rucki
- Centre of Toxicology and Health Safety, National Institute of Public Health, Prague, Czech Republic
| | - Václav Ševčík
- Centre of Toxicology and Health Safety, National Institute of Public Health, Prague, Czech Republic
- Department of Analytical Chemistry, Faculty of Science, Charles University in Prague, Prague, Czech Republic
| | - Barbora Hošíková
- Department of Medical Biophysics, Faculty of Medicine and Dentistry, Palacký University, Olomouc, Czech Republic
| | - Jan Chrz
- Centre of Toxicology and Health Safety, National Institute of Public Health, Prague, Czech Republic
- Department of Medical Biophysics, Faculty of Medicine and Dentistry, Palacký University, Olomouc, Czech Republic
| | - Hana Bendová
- Centre of Toxicology and Health Safety, National Institute of Public Health, Prague, Czech Republic
| | - Kristina Kejlová
- Centre of Toxicology and Health Safety, National Institute of Public Health, Prague, Czech Republic
| | - Danuše Očadlíková
- Centre of Toxicology and Health Safety, National Institute of Public Health, Prague, Czech Republic
| | - Marek Malý
- Centre of Toxicology and Health Safety, National Institute of Public Health, Prague, Czech Republic
| | - Hana Kolářová
- Department of Medical Biophysics, Faculty of Medicine and Dentistry, Palacký University, Olomouc, Czech Republic
| | - Marika Mannerström
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Helena Kanďárová
- Institute of Biochemistry and Microbiology, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Bratislava, Slovakia
| | - Dagmar Jírová
- Centre of Toxicology and Health Safety, National Institute of Public Health, Prague, Czech Republic
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Chrz J, Hošíková B, Svobodová L, Očadlíková D, Kolářová H, Dvořáková M, Kejlová K, Malina L, Jírová G, Vlková A, Mannerström M. Comparison of methods used for evaluation of mutagenicity/genotoxicity of model chemicals - parabens. Physiol Res 2020; 69:S661-S679. [PMID: 33646007 PMCID: PMC8603696 DOI: 10.33549/physiolres.934615] [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] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 11/10/2020] [Indexed: 11/25/2022] Open
Abstract
Growing worldwide efforts to replace (reduce) animal testing and to improve alternative in vitro tests which may be more efficient in terms of both time, cost and scientific validity include also genotoxicity/mutagenicity endpoints. The aim of the review article was to summarize currently available in vitro testing approaches in this field, their regulatory acceptance and recommended combinations for classification of chemicals. A study using the combination of Comet Assay performed on two cell lines and the Chromosomal Aberration test on human peripheral lymphocytes was performed with the aim to predict the genotoxic potential of selected paraben esters, serving as a model chemical group. Parabens are widely used in consumer products as preservatives and have been reported to exhibit inconclusive results in numerous genotoxicity studies. The Comet Assay identified Ethylparaben and Benzylparaben as potentially genotoxic. The Chromosomal Aberration test revealed weak genotoxic potential in case of Ethylparaben and positive genotoxicity in case of Butylparaben, Propylparaben and Isopropylparaben. The main reasons for variability seem to be limited water solubility of parabens, determining their bioavailability at the cellular level, and absence of metabolic activation in the Comet Assay. The results confirmed that the Comet Assay should serve as a screening test and should not be used as a stand-alone method for classification of genotoxicity. The weight of evidence approach in risk assessment should be supported with data generated with the use of human relevant in vitro methods based on cells / tissues of human origin.
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Affiliation(s)
- J Chrz
- National Institute of Public Health, Centre of Toxicology and Health Safety, Prague, Czech Republic.
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Zajíčková K, Dvořáková M, Moravcová J, Včelák J, Goltzman D. Familial hypocalciuric hypercalcemia in an index male: grey zones of the differential diagnosis from primary hyperparathyroidism in a 13-year clinical follow up. Physiol Res 2020; 69:S321-S328. [PMID: 33094630 DOI: 10.33549/physiolres.934522] [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: 12/22/2022] Open
Abstract
Familial hypocalciuric hypercalcemia (FHH) type 1, caused by a heterozygous inactivating mutation of the gene encoding the calcium-sensing receptor (CaSR), is characterized by mild to moderate hypercalcemia, hypocalciuria and inappropriately normal or elevated parathyroid hormone (PTH). FHH must be differentiated from primary hyperparathyroidism (PHPT) because parathyroidectomy is ineffective in the former. Herein, we report a 39-year-old male patient with a 13-year history of asymptomatic PTH-dependent hypercalcemia (mean calcium of 2.88 mmol/l; reference range 2.15-2.55 mmol/l) and calcium-to-creatinine clearance ratio (Ca/Cr) ranging from 0.007 to 0.0198, which is consistent with either FHH or PHPT. Although a family history of hypercalcemia was negative, and PET-CT with fluorocholine was suggestive of a parathyroid adenoma, genetic analysis of the CaSR gene identified a heterozygous inactivating mutation NM_000388.4:c.1670G>A p. (Gly557Glu) in exon 6 and a polymorphism NM_000388.4:c.1192G>A p. (Asp398Asn) in exon 4. The G557E mutation has been previously reported in a Japanese family in which all family members with the mutation had Ca/Cr below 0.01 consistent with FHH. The biochemical profile of FHH and PHPT may overlap. Our FHH patient with a G557E CaSR mutation illustrates that the differential diagnosis can be difficult in an index case with no family history, (false) positive parathyroid imaging and higher calciuria than expected for FHH. Calcium intake, vitamin D status and bone resorption might have contributed to the Ca/Cr variations over a 13-year clinical follow up. This case thus emphasizes the irreplaceable role of genetic testing of the CaSR gene when clinical evaluation is inconclusive.
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Affiliation(s)
- K Zajíčková
- Institute of Endocrinology, Prague, Czech Republic.
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Kejlová K, Bendová H, Chrz J, Dvořáková M, Svobodová L, Vlková A, Kubáč L, Kořínková R, Černý J, Očadlíková D, Rucki M, Heinonen T, Jírová D, Letašiová S, Kandarova H, Kolářová H. Toxicological testing of a photoactive phthalocyanine-based antimicrobial substance. Regul Toxicol Pharmacol 2020; 115:104685. [PMID: 32454236 DOI: 10.1016/j.yrtph.2020.104685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 05/11/2020] [Indexed: 10/24/2022]
Abstract
The aim of the study was toxicological testing of an innovative and efficient antimicrobial agent based on photoactive phthalocyanine (Pc) derivative. A promising Aluminium phthalocyanine (AlPc) with efficient and stable antimicrobial effects was subjected to a battery of toxicological tests to avoid local and systemic toxicity hazard. In compliance with the current European legislation restricting the use of experimental animals, the methods comprised exclusively in vitro procedures based on cellular and tissue models of human origin or mimicking human tissues. The battery of toxicological tests to identify local toxicity included skin corrosion/irritation, eye irritation, and phototoxicity. The basic systemic toxicity tests included acute toxicity, skin sensitization, genotoxicity, and endocrine disruption. The results showed that AlPc induced skin and eye irritation, exhibited borderline sensitization potential and mutagenic potential in one test strain of the Ames test, which was not confirmed in the chromosome aberration test. The AlPc was found to be phototoxic. The results from the cytotoxicity test designed for acute oral toxicity estimation were not conclusive, the acute toxicity potential has to be determined by conventional tests in vivo. Regarding endocrine disruption, no agonistic activity of the AlPc on human estrogen receptor α, nor human androgen receptor was observed. The skin penetration/absorption test revealed that the AlPc has not penetrated into the dermis and receptor fluid, confirming no risk of systemic exposure via the bloodstream.
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Affiliation(s)
- Kristina Kejlová
- National Institute of Public Health, Centre of Toxicology and Health Safety, Šrobárova 49/48, 100 00, Prague, Czech Republic.
| | - Hana Bendová
- National Institute of Public Health, Centre of Toxicology and Health Safety, Šrobárova 49/48, 100 00, Prague, Czech Republic
| | - Jan Chrz
- National Institute of Public Health, Centre of Toxicology and Health Safety, Šrobárova 49/48, 100 00, Prague, Czech Republic; Department of Medical Biophysics, Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacký University, Hněvotínská 3, 775 15, Olomouc, Czech Republic
| | - Markéta Dvořáková
- National Institute of Public Health, Centre of Toxicology and Health Safety, Šrobárova 49/48, 100 00, Prague, Czech Republic
| | - Lada Svobodová
- National Institute of Public Health, Centre of Toxicology and Health Safety, Šrobárova 49/48, 100 00, Prague, Czech Republic; Department of Medical Biophysics, Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacký University, Hněvotínská 3, 775 15, Olomouc, Czech Republic
| | - Alena Vlková
- National Institute of Public Health, Centre of Toxicology and Health Safety, Šrobárova 49/48, 100 00, Prague, Czech Republic
| | - Lubomír Kubáč
- Center of Organic Chemistry, Rybitví č.p. 296, 533 54, Rybitví, Czech Republic
| | - Radka Kořínková
- Center of Organic Chemistry, Rybitví č.p. 296, 533 54, Rybitví, Czech Republic
| | - Jiří Černý
- Center of Organic Chemistry, Rybitví č.p. 296, 533 54, Rybitví, Czech Republic
| | - Danuše Očadlíková
- National Institute of Public Health, Centre of Toxicology and Health Safety, Šrobárova 49/48, 100 00, Prague, Czech Republic
| | - Marian Rucki
- National Institute of Public Health, Centre of Toxicology and Health Safety, Šrobárova 49/48, 100 00, Prague, Czech Republic
| | - Tuula Heinonen
- FICAM, Faculty of Medicine and Health Technology, FI-33014, Tampere University, Tampere, Finland
| | - Dagmar Jírová
- National Institute of Public Health, Centre of Toxicology and Health Safety, Šrobárova 49/48, 100 00, Prague, Czech Republic
| | - Silvia Letašiová
- MatTek in Vitro Life Science Laboratories, Mlynské Nivy 73, 82 105, Bratislava, Slovakia
| | - Helena Kandarova
- Institute of Experimental Pharmacology and Toxicology, Centre of Experimental Medicine, Slovak Academy of Sciences, Dúbravská Cesta 9, 841 04, Bratislava, Slovakia.
| | - Hana Kolářová
- Department of Medical Biophysics, Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacký University, Hněvotínská 3, 775 15, Olomouc, Czech Republic
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Vavrouš A, Ševčík V, Dvořáková M, Čabala R, Moulisová A, Vrbík K. Easy and Inexpensive Method for Multiclass Analysis of 41 Food Contact Related Contaminants in Fatty Food by Liquid Chromatography-Tandem Mass Spectrometry. J Agric Food Chem 2019; 67:10968-10976. [PMID: 31487165 DOI: 10.1021/acs.jafc.9b02544] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Food contact materials (FCMs) may release their chemical components into food and thus raise safety concerns. This paper attempted to study the presence of four major groups of FCM-related endocrine disruptors in fatty food: dialkyl phthalates, bisphenols, printing ink photoinitiators, and polyfluoroalkyl substances. All 41 target compounds were analyzed simultaneously by means of liquid chromatography coupled to tandem mass spectrometry. The sample preparation was significantly streamlined to reduce analysis costs by employing acetonitrile extraction, extract modification by water, and refrigeration at 5 °C. The new method was validated and applied to 60 real samples, including edible oils, butter, and chocolate, where 16 target compounds were measured at levels ≤13000 ng/g. The study also described the blank level increase and sensitivity loss caused by impurities present in the HPLC methanol solvent.
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Affiliation(s)
- Adam Vavrouš
- Centre of Toxicology and Health Safety , National Institute of Public Health , Srobarova 48 , 100 00 Praha 10 , Czech Republic
- Department of Analytical Chemistry, Faculty of Science , Charles University in Prague , Hlavova 8 , 128 43 Praha 2 , Czech Republic
| | - Václav Ševčík
- Centre of Toxicology and Health Safety , National Institute of Public Health , Srobarova 48 , 100 00 Praha 10 , Czech Republic
- Department of Analytical Chemistry, Faculty of Science , Charles University in Prague , Hlavova 8 , 128 43 Praha 2 , Czech Republic
| | - Markéta Dvořáková
- Centre of Toxicology and Health Safety , National Institute of Public Health , Srobarova 48 , 100 00 Praha 10 , Czech Republic
- Third Faculty of Medicine , Charles University in Prague , Ruska 87 , 100 00 Prague 10 , Czech Republic
| | - Radomír Čabala
- Department of Analytical Chemistry, Faculty of Science , Charles University in Prague , Hlavova 8 , 128 43 Praha 2 , Czech Republic
- Institute of Forensic Medicine and Toxicology, First Faculty of Medicine , Charles University in Prague and General University Hospital , 121 08 Prague 2 , Czech Republic
| | - Alena Moulisová
- Centre of Toxicology and Health Safety , National Institute of Public Health , Srobarova 48 , 100 00 Praha 10 , Czech Republic
| | - Karel Vrbík
- Centre of Toxicology and Health Safety , National Institute of Public Health , Srobarova 48 , 100 00 Praha 10 , Czech Republic
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Kejlová K, Dvořáková M, Vavrouš A, Ševčík V, Kanďárová H, Letašiová S, Sosnovcová J, Jírová D. Toxicity of food contact paper evaluated by combined biological and chemical methods. Toxicol In Vitro 2019; 59:26-34. [PMID: 30951805 DOI: 10.1016/j.tiv.2019.04.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 03/27/2019] [Accepted: 04/01/2019] [Indexed: 12/16/2022]
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Trebatický B, Žitňanová I, Dvořáková M, Országhová Z, Paduchová Z, Ďuračková Z, Breza J, Muchová J. Role of oxidative stress, adiponectin and endoglin in the pathophysiology of erectile dysfunction in diabetic and non-diabetic men. Physiol Res 2019; 68:623-631. [PMID: 31177798 DOI: 10.33549/physiolres.934129] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Erectile dysfunction (ED) and diabetes mellitus (DM) share common pathophysiological risk factors including endothelial dysfunction which together with hyperglycemia contribute to the increased oxidative/glycooxidative stress. A reduced NO concentration is insufficient for relaxation processes in the penis. Chronic inflammation and endoglin are involved in the regulation of endothelial function. Adiponectin from the adipose tissue has anti-inflammatory effects. Our study aimed to investigate the relation between erectile function in patients with and without DM and the oxidative stress, hormone adiponectin, and endothelial dysfunction marker endoglin. Men (n=32) with ED evaluated by the International Index of Erectile function (IIEF-5) questionnaire (17 without DM (NDM); 15 with type 2 diabetes mellitus (DM)) and 31 controls were included. Advanced glycation end products (AGEs), 8-isoprostanes (8-isoP), protein carbonyls, antioxidant capacity, adiponectin and endoglin were determined in the blood. DM patients compared to NDM patients and controls, had increased levels of glucose, C-reactive protein, triacylglycerols, 8-isoP, AGEs, endoglin and BMI. IIEF-5 score, NO and adiponectin levels were decreased. We are the first to find out that endoglin shows a negative correlation with erectile function in NDM, but not in DM patients. Endoglin can be considered as endothelial dysfunction marker in nondiabetic men suffering from ED.
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Affiliation(s)
- B Trebatický
- Department of Urology, Faculty of Medicine, Comenius University and University Hospital Bratislava, Slovakia, and Institute of Medical Chemistry, Biochemistry and Clinical Biochemistry, Faculty of Medicine, Comenius University, Bratislava, Slovakia
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Dvořák M, Dvořáková M. Genes and Mechanisms Responsible for Expansion of Acute Myeloid Leukaemia Blasts. Folia Biol (Praha) 2019; 65:11-23. [PMID: 31171078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Acute myeloid leukaemia (AML) is the leading form of fatal acute leukaemia in adults. AML is a heterogeneous disease with respect to responsible mutations and chromosomal abnormalities as well as to their clinicopathological image. In recent years, great progress has been made in techniques allowing detection of genetic changes in both de novo AML and in secondary AML induced by other haematological disorders or therapy, and in detection of residual disease after therapy. Accumulated knowledge allowed better understanding of the molecules and mechanisms involved not only in the formation and expansion of a primary leukaemia-founding clone, but also of a temporal order of changes leading to the fully malignant phenotype. The recent knowledge of bone marrow (BM) compartments and interrelations among various BM resident and recruited cell types helps in understanding the AML development. The progress in the techniques and knowledge will result in the development and use of molecularly targeted therapies tailored to individual patient needs.
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Affiliation(s)
- M Dvořák
- Department of Cell Differentiation, Institute of Molecular Genetics of the ASCR, v. v. i., Prague, Czech Republic
| | - M Dvořáková
- Department of Cell Differentiation, Institute of Molecular Genetics of the ASCR, v. v. i., Prague, Czech Republic
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Němeček D, Dvořáková M, Heroutová I, Chmelíková E, Sedmíková M. Anti-apoptotic properties of carbon monoxide in porcine oocyte during in vitro aging. PeerJ 2017; 5:e3876. [PMID: 29018614 PMCID: PMC5633033 DOI: 10.7717/peerj.3876] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 04/04/2017] [Accepted: 09/09/2017] [Indexed: 12/23/2022] Open
Abstract
If fertilization of matured oocyte does not occur, unfertilized oocyte undergoes aging, resulting in a time-dependent reduction of the oocyte’s quality. The aging of porcine oocytes can lead to apoptosis. Carbon monoxide (CO), a signal molecule produced by the heme oxygenase (HO), possesses cytoprotective and anti-apoptotic effects that have been described in somatic cells. However, the effects of CO in oocytes have yet to be investigated. By immunocytochemistry method we detected that both isoforms of heme oxygenase (HO-1 and HO-2) are present in the porcine oocytes. Based on the morphological signs of oocyte aging, it was found that the inhibition of both HO isoforms by Zn-protoporphyrin IX (Zn-PP IX) leads to an increase in the number of apoptotic oocytes and decrease in the number of intact oocytes during aging. Contrarily, the presence of CO donors (CORM-2 or CORM-A1) significantly decrease the number of apoptotic oocytes while increasing the number of intact oocytes. We also determined that CO donors significantly decrease the caspase-3 (CAS-3) activity. Our results suggest that HO/CO contributes to the sustaining viability through regulation of apoptosis during in vitro aging of porcine oocytes.
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Affiliation(s)
- David Němeček
- Department of Veterinary Sciences, Czech University of Life Sciences, Prague, Czech Republic
| | - Markéta Dvořáková
- Department of Veterinary Sciences, Czech University of Life Sciences, Prague, Czech Republic
| | - Ivona Heroutová
- Department of Veterinary Sciences, Czech University of Life Sciences, Prague, Czech Republic
| | - Eva Chmelíková
- Department of Veterinary Sciences, Czech University of Life Sciences, Prague, Czech Republic
| | - Markéta Sedmíková
- Department of Veterinary Sciences, Czech University of Life Sciences, Prague, Czech Republic
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Kejlová K, Bendová H, Sosnovcová J, Chrz J, Dvořáková M, Krsek D, Kolářová H, Vlková A, Očadlíková D. Hazard identification in novel antimicrobials assessed by methods in vitro. Toxicol Lett 2017. [DOI: 10.1016/j.toxlet.2017.07.918] [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: 10/18/2022]
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13
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Pinďáková L, Kašpárková V, Kejlová K, Dvořáková M, Krsek D, Jírová D, Kašparová L. Behaviour of silver nanoparticles in simulated saliva and gastrointestinal fluids. Int J Pharm 2017; 527:12-20. [PMID: 28506800 DOI: 10.1016/j.ijpharm.2017.05.026] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 05/09/2017] [Accepted: 05/11/2017] [Indexed: 01/20/2023]
Abstract
Continuously increasing application of silver nanoparticles (AgNPs) requires information on their safety and performance under biological conditions. Assessment of AgNPs in biological systems is also related to availability of robust toxicological methods for evaluation of toxic potential of AgNPs and information on their physicochemical state. Silver nanoparticles were subjected to action of simulated saliva, gastric and intestinal fluids, appropriately supplemented with digestive enzymes pepsin or pancreatin. The behaviour of AgNPs was determined using dynamic light scattering and transmission electron microscopy, and their toxicity as well as capability to induce inflammatory reactions were assessed using reconstructed human tissue models (EpiOral, EpiGingival, EpiIntestinal). The study revealed that during exposure to the fluids, AgNPs size and morphology changed and depended on composition and pH of the respective fluid. If present, the change in terms of growth of AgNPs size occurred immediately after contact of AgNPs with the respective fluid and continued with prolonged time of contact. A pilot study on reconstituted human tissue models revealed low toxicity and inflammatory effects of AgNPs and confirmed the suitability of 3-D models for toxicological studies including bioavailability.
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Affiliation(s)
- Lucie Pinďáková
- Department of Fat, Surfactant and Cosmetics Technology, Faculty of Technology, Tomas Bata University in Zlin, Nam T.G. Masaryka 5555, 760 01 Zlín, Czech Republic
| | - Věra Kašpárková
- Department of Fat, Surfactant and Cosmetics Technology, Faculty of Technology, Tomas Bata University in Zlin, Nam T.G. Masaryka 5555, 760 01 Zlín, Czech Republic; Centre of Polymer Systems, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlín, Czech Republic.
| | - Kristina Kejlová
- National Institute of Public Health, Šrobárova 48, 100 42 Prague, Czech Republic
| | - Markéta Dvořáková
- National Institute of Public Health, Šrobárova 48, 100 42 Prague, Czech Republic
| | - Daniel Krsek
- National Institute of Public Health, Šrobárova 48, 100 42 Prague, Czech Republic
| | - Dagmar Jírová
- National Institute of Public Health, Šrobárova 48, 100 42 Prague, Czech Republic
| | - Lucie Kašparová
- National Institute of Public Health, Šrobárova 48, 100 42 Prague, Czech Republic
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14
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Němeček D, Dvořáková M, Sedmíková M. Heme oxygenase/carbon monoxide in the female reproductive system: an overlooked signalling pathway. Int J Biochem Mol Biol 2017; 8:1-12. [PMID: 28123837 PMCID: PMC5259583] [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] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 11/23/2016] [Indexed: 06/06/2023]
Abstract
For a long time, carbon monoxide (CO) was known for its toxic effect on organisms. But there are still many things left to discover on that molecule. CO is formed directly in the body by the enzymatic activity of heme oxygenase (HO). CO plays an important role in many physiological processes, such as cell protections (against various stress factors), and the regulation of metabolic processes. Recent research proves that CO also operates in the female reproductive system. At the centre of interest is the importance of CO for gestation. During the gestation period, CO is an important element affecting the proper function of the feto-placental unit and generally affects fetal survivability rates. Gestation is one of the most important processes of successful reproduction, although there are more relevant processes that need to be researched. While already proven that CO influences steroidogenesis and the corpus luteum survivability rate, our knowledge concerning the function and importance of CO in the reproductive system is still relatively limited. As an example, our knowledge of CO function in an oocyte, the most important cell for reproduction, is almost non-existent. The aim of this review is to summarize our current knowledge concerning the function of CO in the female reproductive system.
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Affiliation(s)
- David Němeček
- Department of Veterinary Sciences, Czech University of Life Sciences Prague, Czech Republic
| | - Markéta Dvořáková
- Department of Veterinary Sciences, Czech University of Life Sciences Prague, Czech Republic
| | - Markéta Sedmíková
- Department of Veterinary Sciences, Czech University of Life Sciences Prague, Czech Republic
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15
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Dvořáková M, Kejlová K, Bendová H, Rucki M, Kohout P, Vavrouš A, Jírová D. Alternative methods in vitro for screening of endocrine disruptors. Neuro Endocrinol Lett 2016; 37:123-131. [PMID: 28263540] [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] [Received: 06/26/2016] [Accepted: 10/30/2016] [Indexed: 06/06/2023]
Abstract
OBJECTIVES The aim of this study was to compare in silico data with results obtained in two alternative in vitro methods; and to investigate the potential endocrine activity of bisphenol A analogues. This article contributes to recent findings and brings up-to-date information on development of EU legislation and in vitro testing methods of endocrine disruption. METHODS In silico approach based on the OECD QSAR Toolbox was used for prediction of potential ligands of human estrogen receptor α. Estrogen Receptor Transactivation in vitro Assay to Detect Estrogen Receptor Agonists and Antagonists (OECD TG 455/457) using the VM7Luc4E2 (formerly designated BG1Luc4E2) cell line was performed for measurement of transactivation activity of the tested substances. Commercially available yeast-based microplate assay (XenoScreen YES/YAS, Xenometrix, Switzerland) for detection of compounds with estrogenic and androgenic agonistic/antagonistic activity was used as a comparative test to estrogen receptor transactivation assay (OECD TG 455/457) and for screening of the agonistic/antagonistic potential of human estrogen receptor and agonistic/antagonistic activity of tested compounds on human androgen receptor. RESULTS The study showed good correlation between the two in vitro assays and significant correlation with in silico data. All tested substances were identified as agonists for human estrogen receptor α by methods in silico and in vitro, four substances showed a potentially higher estrogenic activity comparing to bisphenol A, two substances were identified as very weak antagonists of human androgen receptor and one compound showed a potential of agonistic activity to human androgen receptor. CONCLUSIONS The study contributes to recent findings and brings new in silico and in vitro data of bisphenol A analogues, revealing that these analogous substances should be further tested as they may show similar or higher activity in vivo comparing to bisphenol A, which has been recently legislatively regulated.
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Affiliation(s)
- Markéta Dvořáková
- Third Faculty of Medicine, Charles University, Prague, Czech Republic
- National Institute of Public Health, Centre of Toxicology and Health Safety, Prague, Czech Republic
| | - Kristina Kejlová
- National Institute of Public Health, Centre of Toxicology and Health Safety, Prague, Czech Republic
| | - Hana Bendová
- National Institute of Public Health, Centre of Toxicology and Health Safety, Prague, Czech Republic
| | - Marian Rucki
- National Institute of Public Health, Centre of Toxicology and Health Safety, Prague, Czech Republic
| | | | - Adam Vavrouš
- National Institute of Public Health, Centre of Toxicology and Health Safety, Prague, Czech Republic
| | - Dagmar Jírová
- National Institute of Public Health, Centre of Toxicology and Health Safety, Prague, Czech Republic
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16
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Dvořáková M, Heroutová I, Němeček D, Adámková K, Krejčová T, Nevoral J, Kučerová Chrpová V, Petr J, Sedmíková M. The antioxidative properties of S-allyl cysteine not only influence somatic cells but also improve early embryo cleavage in pigs. PeerJ 2016; 4:e2280. [PMID: 27602268 PMCID: PMC4991846 DOI: 10.7717/peerj.2280] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Accepted: 07/02/2016] [Indexed: 01/31/2023] Open
Abstract
In vitro cultivation systems for oocytes and embryos are characterised by increased levels of reactive oxygen species (ROS), which can be balanced by the addition of suitable antioxidants. S-allyl cysteine (SAC) is a sulfur compound naturally occurring in garlic (Allium sativum), which is responsible for its high antioxidant properties. In this study, we demonstrated the capacity of SAC (0.1, 0.5 and 1.0 mM) to reduce levels of ROS in maturing oocytes significantly after 24 (reduced by 90.33, 82.87 and 91.62%, respectively) and 48 h (reduced by 86.35, 94.42 and 99.05%, respectively) cultivation, without leading to a disturbance of the standard course of meiotic maturation. Oocytes matured in the presence of SAC furthermore maintained reduced levels of ROS even 22 h after parthenogenic activation (reduced by 66.33, 61.64 and 57.80%, respectively). In these oocytes we also demonstrated a growth of early embryo cleavage rate (increased by 33.34, 35.00 and 35.00%, respectively). SAC may be a valuable supplement to cultivation media.
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Affiliation(s)
- Markéta Dvořáková
- Department of Veterinary Sciences, Czech University of Life Sciences , Prague , Czech Republic
| | - Ivona Heroutová
- Department of Veterinary Sciences, Czech University of Life Sciences , Prague , Czech Republic
| | - David Němeček
- Department of Veterinary Sciences, Czech University of Life Sciences , Prague , Czech Republic
| | - Kateřina Adámková
- Department of Veterinary Sciences, Czech University of Life Sciences , Prague , Czech Republic
| | - Tereza Krejčová
- Department of Veterinary Sciences, Czech University of Life Sciences , Prague , Czech Republic
| | - Jan Nevoral
- Department of Veterinary Sciences, Czech University of Life Sciences, Prague, Czech Republic; Biomedical center, Faculty of Medicine in Pilsen, Charles University in Prague, Plzen, Czech Republic
| | | | - Jaroslav Petr
- Institute of Animal Science , Prague , Czech Republic
| | - Markéta Sedmíková
- Department of Veterinary Sciences, Czech University of Life Sciences , Prague , Czech Republic
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17
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Vosátková M, Čeřovská J, Zamrazilová H, Hoskovcová P, Dvořáková M, Zamrazil V. Prevalence of Obesity and Metabolic Syndrome in Adult Population of Selected Regions of the Czech Republic. Relation to Eating Habits and Smoking. Prague Med Rep 2015; 113:206-16. [DOI: 10.14712/23362936.2015.18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
Prevalence of the metabolic syndrome is around 25% in Europe but its occurrence grows in both genders with increasing age and weight. Lifestyle factors may contribute to the risk of developing metabolic syndrome. The objective of this study was to determine the relationship between metabolic syndrome and eating habits as well as length of sleep and smoking. Participants (519 women and 286 men aged 18–65 years) were chosen by random selection and questioned about their eating habits, sleep length and smoking. This information was combined with anthropometric and clinical parameters of metabolic syndrome. The female group was divided into two subgroups depending on climacteric stage (before and after menopause). Metabolic syndrome prevalence does not differ between regions in neither female (29.9%) nor male (32.5%) group. Body mass index ≥25 was detected in 50.4% of all women and 65.7% of men; 23.5% of all women and 21.7% men had body mass index ≥30. In conclusion, metabolic syndrome prevalence was proved to depend on eating habits and family heredity. Positive correlation between the above mentioned factors demonstrated itself in the total sample but not in individual regions. Metabolic syndrome prevalence in Czech adults is comparable with neighbouring countries. No significant interregional differences in metabolic syndrome prevalence within the Czech Republic were detected. In conclusion, relationship between eating habits and metabolic syndrome was confirmed.
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18
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Bouchal P, Dvořáková M, Roumeliotis T, Bortlíček Z, Ihnatová I, Procházková I, Ho J, Maryáš J, Imrichová H, Budinská E, Vyzula R, Garbis S, Vojtěšek B, Nenutil R. 185 Combined proteomics and transcriptomics identifies carboxypeptidase B1 and NF-κB associated proteins as putative biomarkers of metastasis in low grade breast cancer. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30082-x] [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]
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19
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Jírová D, Kejlová K, Janoušek S, Bendová H, Malý M, Kolářová H, Dvořáková M. Eye irritation hazard of chemicals and formulations assessed by methods in vitro. Neuro Endocrinol Lett 2014; 35 Suppl 2:133-140. [PMID: 25638377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Accepted: 11/08/2014] [Indexed: 06/04/2023]
Abstract
BACKGROUND The aim of this study was to compare human and animal skin irritation data with results of selected in vitro methods, including HET-CAM test, Neutral Red Release Assay, Neutral Red Uptake Assay and EpiOcular eye irritation test and with already existing data of eye irritation obtained from animal experiments. METHODS Chemicals employed in previous skin irritation validation studies and commercially available cosmetic formulations were subjected to further testing using in vitro methods Neutral Red Release (NRR) assay, Neutral Red Uptake (NRU) assay, HET-CAM test and EpiOcular assay. RESULTS The study revealed that skin irritants are not necessarily eye irritants; specifically volatile or solid materials may be misclassified. NRR assay provided false negative results in case of substances with fixative effect or not removable under standard washing procedure, emphasizing the role of microscopical evaluation as a crucial additional endpoint. Although overpredictive, HET-CAM test provided the lowest false negative rate. The most aggressive cosmetic formulation was correctly identified by EpiOcular assay, in accordance with NRU and NRR assays results, while HET-CAM test correctly identified the mildest formulation. CONCLUSIONS Each of the in vitro methods is related to a specific endpoint of ocular irritation and provides only partial information on the mode of action of the tested material. Despite good reproducibility of individual in vitro assays, only the weight-of-evidence approach and results of multiple selected in vitro tests can allow for estimation of eye irritation hazard in vivo.
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Koláček M, Muchová J, Dvořáková M, Paduchová Z, Žitňanová I, Čierna I, Országhová Z, Székyová D, Jajcaiová-Zedníčková N, Kovács L, Ďuračková Z. Effect of natural polyphenols (Pycnogenol) on oxidative stress markers in children suffering from Crohn's disease--a pilot study. Free Radic Res 2013; 47:624-34. [PMID: 23710677 DOI: 10.3109/10715762.2013.807508] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Crohn's disease (CD) is a nonspecific, chronic inflammatory disease of the gastrointestinal tract. It is supposed that in etiopathogenesis oxidative stress (OS) plays a role. However, its precise role in the active and non-active states of disease is not known yet. We conducted a pilot study focusing on the relationship between OS of CD in remission and the possibility to influence clinical parameters and markers of OS by polyphenolic extract, Pycnogenol® (Pyc). Compared to 15 healthy controls 15 pediatric CD patients (all were in remission according to their disease activity index - PCDAI) had reduced the activity of Cu/Zn-superoxide dismutase (SOD) and increased the oxidative damage to proteins. We found negative correlations between markers of inflammation (calprotectin, CRP) as well as between PCDAI and total antioxidant capacity (TAC). Activities of antioxidant enzymes, SOD, and glutathione peroxidase (GPX) negatively correlated with calprotectin and PCDAI. Pyc (2 mg/kg) positively influenced the parameters of OS in CD patients after 10 weeks of administration.
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Affiliation(s)
- M Koláček
- Institute of Medical Chemistry, Biochemistry and Clinical Biochemistry, Faculty of Medicine, Comenius University, Bratislava, Slovak Republic
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21
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Dvořáková M, Karafiát V, Pajer P, Kluzáková E, Jarkovská K, Peková S, Krutílková L, Dvořák M. DNA released by leukemic cells contributes to the disruption of the bone marrow microenvironment. Oncogene 2012; 32:5201-9. [PMID: 23222712 DOI: 10.1038/onc.2012.553] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Revised: 10/01/2012] [Accepted: 10/02/2012] [Indexed: 12/22/2022]
Abstract
Reciprocal interactions between a tumor and its microenvironment control expansion of tumor cells. Here we show a specific type of interaction in which blasts of experimental leukemia destroy the bone marrow (BM) structures and kill stromal cells. The in vitro experiments showed that the cytotoxic agent released by leukemic cells is the fragmented DNA derived from their genome and occurring in nucleosome-like complexes. This DNA entered nuclei of BM or other cells and induced H2A.X phosphorylation at serine 139, similar to double-strand break-inducing agents. There was a correlation between large amounts of acquired DNA and death of recipient cells. Moreover, the DNA integrated into chromosomal DNA of recipient cells. Primary human acute myeloid leukemia cells also released fragmented DNA that penetrated the nuclei of other cells both in vitro and in vivo. We suggest that DNA fragments released from leukemic and also perhaps other types of tumor cells can activate DNA repair mechanisms or death in recipient cells of a tumor microenvironment, depending on the amount of the acquired DNA. This can impair DNA stability and viability of tumor stromal cells, undermine homeostatic capacity of tumor microenvironment and facilitate tumor progression.
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Affiliation(s)
- M Dvořáková
- Institute of Molecular Genetics, AS CR, Prague, Czech Republic
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22
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Dvořáková M, Douanier M, Jurková M, Kellner V, Dostálek P. Comparison of Antioxidant Activity of Barley (Hordeum vulgare L.) and Malt Extracts with the Content of Free Phenolic Compounds Measured by High Performance Liquid Chromatography Coupled with CoulArray Detector. Journal of the Institute of Brewing 2012. [DOI: 10.1002/j.2050-0416.2008.tb00320.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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23
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Dvořáková M, Guido LF, Dostálek P, Skulilová Z, Moreira MM, Barros AA. Antioxidant Properties of Free, Soluble Ester and Insoluble-Bound Phenolic Compounds in Different Barley Varieties and Corresponding Malts. Journal of the Institute of Brewing 2012. [DOI: 10.1002/j.2050-0416.2008.tb00302.x] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Dvořák L, Gómez M, Dvořáková M, Růžičková I, Wanner J. The impact of different operating conditions on membrane fouling and EPS production. Bioresour Technol 2011; 102:6870-6875. [PMID: 21565496 DOI: 10.1016/j.biortech.2011.04.061] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Revised: 04/18/2011] [Accepted: 04/19/2011] [Indexed: 05/30/2023]
Abstract
The main goal of this research was to investigate how different factors influence membrane fouling. The impact of the different concentrations of activated sludge and the amount of extracellular polymer substances (EPS) were monitored. Two pilot plants with submerged membrane modules (hollow fiber and flat sheet) were operated and the raw wastewater was used. Humic substances were identified as the major components of EPS in the activated sludge (more than 34%) in both pilot plants. As the basic constituent in permeate, humic substances were identified as the most dominant components in the effluent (61%) in both pilot plants. Conversely, proteins were mostly analyzed in permeate and supernatant below the detection limit. The total amount of EPS [mgg(-1) (VSS)] was similar for concentrations of activated sludge 6, 10 and 14 g L(-1). Carbohydrates were identified as the component of EPS which tends most to clog membranes.
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Affiliation(s)
- Lukáš Dvořák
- Department of Water Technology and Environmental Engineering, Institute of Chemical Technology, Prague, Technická 5, 166 28 Prague 6 - Dejvice, Czech Republic.
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25
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Dvořáková M, Paduchová Z, Muchová J, Duračková Z, Collins AR. How does pycnogenol® influence oxidative damage to DNA and its repair ability in elderly people? Prague Med Rep 2010; 111:263-271. [PMID: 21189165] [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: 05/30/2023] Open
Abstract
Our purpose in this randomized, double blind, placebo controlled study was to find out the possible effect of a polyphenolic pine bark extract, Pycnogenol® (Pyc) on the level of 8-oxo-7,8-dihydroguanine (8-oxoG) as representative of oxidative damage to DNA and on the DNA repair ability of elderly people. According to our results, three months of Pyc administration had no effect on the level of oxidative damage to DNA or on repair ability, but we found a relationship between the level of 8-oxoG and repair ability of DNA in this group. To conclude, even if the positive effect of Pyc was not confirmed in the case of elderly people it is important to highlight the necessity of further investigations about the mechanisms of Pyc acting on different age groups.
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Affiliation(s)
- M Dvořáková
- Department of Medical Chemistry, Biochemistry and Clinical Biochemistry, Faculty of Medicine, Comenius University, Bratislava, Slovak Republic.
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Kabelová I, Dvořáková M, Čížková H, Dostálek P, Melzoch K. Determination of free amino acids in beers: A comparison of Czech and foreign brands. J Food Compost Anal 2008. [DOI: 10.1016/j.jfca.2008.06.007] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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Dvořáková M, Hill M, Čeřovská J, Pobišová Z, Bílek R, Hoskovcová P, Zamrazil V, Hainer V. Relationship between pituitary-thyroid axis hormones and anthropometric parameters in Czech adult population. Physiol Res 2008; 57 Suppl 1:S127-S134. [PMID: 18271684 DOI: 10.33549/physiolres.931497] [Citation(s) in RCA: 8] [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: 11/25/2022] Open
Abstract
Although the relationships between thyroid function and anthropometric parameters were studied in patients with thyroid disorders and in morbidly obese subjects, such data in normal healthy population are scarce. In our study, relationships between factors of body composition, fat distribution and age with hormones of the pituitary-thyroid axis were evaluated in a large, randomly selected sample of normal adult Czech population comprising of 1012 men and 1625 women. Our results exhibited weak, but significant relationships between body composition, body fat distribution and the parameters of pituitary-thyroid axis. Some of these associations were gender-specific. As shown by backward stepwise regression model, body fat distribution evaluated by centrality index (subscapular/triceps skinfold ratio) was negatively associated with free triiodothyronine (fT3) serum levels only in women, while a positive correlation of fT3 with BMI was specific for men. BMI was inversely related to free thyroxine (fT4) concentrations in women but not in men. The centrality index (CI) was positively related to TSH levels in both genders. The fT3/fT4 ratio, reflecting deiodinase activity, was inversely related to age and positively related to BMI in both genders, while the highly significant negative correlation between CI and fT3/fT4 ratio was specific for women.
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Affiliation(s)
- M Dvořáková
- Institute of Endocrinology, Prague, Czech Republic.
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