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Kovář M, Šubr V, Běhalová K, Studenovský M, Starenko D, Kovářová J, Procházková P, Etrych T, Kostka L. Chemosensitization of tumors via simultaneous delivery of STAT3 inhibitor and doxorubicin through HPMA copolymer-based nanotherapeutics with pH-sensitive activation. Nanomedicine 2024; 56:102730. [PMID: 38158146 DOI: 10.1016/j.nano.2023.102730] [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: 06/27/2023] [Revised: 10/13/2023] [Accepted: 12/12/2023] [Indexed: 01/03/2024]
Abstract
We synthesized three novel STAT3 inhibitors (S3iD1-S3iD3) possessing oxoheptanoic residue enabling linkage to HPMA copolymer carrier via a pH-sensitive hydrazone bond. HPMA copolymer conjugates bearing doxorubicin (Dox) and our STAT3 inhibitors were synthesized to evaluate the anticancer effect of Dox and STAT3 inhibitor co-delivery into tumors. S3iD1-3 and their copolymer-bound counterparts (P-S3iD1-P-S3iD3) showed considerable in vitro cytostatic activities in five mouse and human cancer cell lines with IC50 ~0.6-7.9 μM and 0.7-10.9 μM, respectively. S3iD2 and S3iD3 were confirmed to inhibit the STAT3 signaling pathway. The combination of HPMA copolymer-bound Dox (P-Dox) and P-S3iD3 at the dosage showing negligible toxicity demonstrated significant antitumor activity in B16F10 melanoma-bearing mice and completely cured 2 out of 15 mice. P-Dox alone had a significantly lower therapeutic activity with no completely cured mice. Thus, polymer conjugates bearing STAT3 inhibitors may be used for the chemosensitization of chemorefractory tumors.
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Affiliation(s)
- M Kovář
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic
| | - V Šubr
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 16200 Prague, Czech Republic
| | - K Běhalová
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic
| | - M Studenovský
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 16200 Prague, Czech Republic
| | - D Starenko
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic
| | - J Kovářová
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic
| | - P Procházková
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, 14220 Prague, Czech Republic
| | - T Etrych
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 16200 Prague, Czech Republic
| | - L Kostka
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 16200 Prague, Czech Republic.
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2
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Strachota B, Strachota A, Horodecka S, Steinhart M, Kovářová J, Pavlova E, Ribot F. Polyurethane nanocomposites containing the chemically active inorganic Sn-POSS cages. REACT FUNCT POLYM 2019. [DOI: 10.1016/j.reactfunctpolym.2019.104338] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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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3
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Bober P, Trchová M, Kovářová J, Acharya U, Hromádková J, Stejskal J. Reduction of silver ions to silver with polyaniline/poly(vinyl alcohol) cryogels and aerogels. Chem Pap 2018. [DOI: 10.1007/s11696-017-0374-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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4
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Stejskal J, Mrlík M, Plachý T, Trchová M, Kovářová J, Li Y. Molybdenum and tungsten disulfides surface-modified with a conducting polymer, polyaniline, for application in electrorheology. REACT FUNCT POLYM 2017. [DOI: 10.1016/j.reactfunctpolym.2017.09.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Spěváček J, Konefał R, Dybal J, Čadová E, Kovářová J. Thermoresponsive behavior of block copolymers of PEO and PNIPAm with different architecture in aqueous solutions: A study by NMR, FTIR, DSC and quantum-chemical calculations. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.07.034] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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6
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Michálek J, Abbrent S, Musil M, Kovářová J, Hodan J, Dybal J. New type of gel polymer electrolytes based on selected methacrylates and their characteristics. Part II. Fluorinated Co-polymers. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.05.057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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7
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Rodzeń K, Strachota A, Ribot F, Matějka L, Kovářová J, Trchová M, Šlouf M. Reactivity of the tin homolog of POSS, butylstannoxane dodecamer, in oxygen-induced crosslinking reactions with an organic polymer matrix: Study of long-time behavior. Polym Degrad Stab 2015. [DOI: 10.1016/j.polymdegradstab.2015.04.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Musil M, Michálek J, Abbrent S, Kovářová J, Přádný M, Doubková L, Vondrák J, Sedlaříková M. New type of gel polyelectrolytes based on selected methacrylates and their characteristics. Part I. Copolymers with (3-(trimethoxysilyl)propyl methacrylate). Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2014.12.154] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Stejskal J, Sapurina I, Trchová M, Šeděnková I, Kovářová J, Kopecká J, Prokeš J. Coaxial conducting polymer nanotubes: polypyrrole nanotubes coated with polyaniline or poly(p-phenylenediamine) and products of their carbonisation. Chemical Papers 2015. [DOI: 10.1515/chempap-2015-0152] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractPolypyrrole nanotubes were prepared by the oxidation of pyrrole with iron(III) chloride in a reaction mixture containing methyl orange. They were subsequently coated with polyaniline or poly(p-phenylenediamine) in situ during the oxidation of respective monomers in their presence. A part of the coaxial nanotubes was deprotonated using ammonia solution. The conductivity of polypyrrole nanotubes of 60 S cm
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Kasoju N, Kubies D, Kumorek MM, Kříž J, Fábryová E, Machová L, Kovářová J, Rypáček F. Dip TIPS as a facile and versatile method for fabrication of polymer foams with controlled shape, size and pore architecture for bioengineering applications. PLoS One 2014; 9:e108792. [PMID: 25275373 PMCID: PMC4183526 DOI: 10.1371/journal.pone.0108792] [Citation(s) in RCA: 14] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 08/26/2014] [Indexed: 02/08/2023] Open
Abstract
The porous polymer foams act as a template for neotissuegenesis in tissue engineering, and, as a reservoir for cell transplants such as pancreatic islets while simultaneously providing a functional interface with the host body. The fabrication of foams with the controlled shape, size and pore structure is of prime importance in various bioengineering applications. To this end, here we demonstrate a thermally induced phase separation (TIPS) based facile process for the fabrication of polymer foams with a controlled architecture. The setup comprises of a metallic template bar (T), a metallic conducting block (C) and a non-metallic reservoir tube (R), connected in sequence T-C-R. The process hereinafter termed as Dip TIPS, involves the dipping of the T-bar into a polymer solution, followed by filling of the R-tube with a freezing mixture to induce the phase separation of a polymer solution in the immediate vicinity of T-bar; Subsequent free-drying or freeze-extraction steps produced the polymer foams. An easy exchange of the T-bar of a spherical or rectangular shape allowed the fabrication of tubular, open- capsular and flat-sheet shaped foams. A mere change in the quenching time produced the foams with a thickness ranging from hundreds of microns to several millimeters. And, the pore size was conveniently controlled by varying either the polymer concentration or the quenching temperature. Subsequent in vivo studies in brown Norway rats for 4-weeks demonstrated the guided cell infiltration and homogenous cell distribution through the polymer matrix, without any fibrous capsule and necrotic core. In conclusion, the results show the "Dip TIPS" as a facile and adaptable process for the fabrication of anisotropic channeled porous polymer foams of various shapes and sizes for potential applications in tissue engineering, cell transplantation and other related fields.
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Affiliation(s)
- Naresh Kasoju
- Department of Biomaterials and Bioanalogous Polymer Systems, Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Prague, Czech Republic
| | - Dana Kubies
- Department of Biomaterials and Bioanalogous Polymer Systems, Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Prague, Czech Republic
| | - Marta M. Kumorek
- Department of Biomaterials and Bioanalogous Polymer Systems, Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Prague, Czech Republic
| | - Jan Kříž
- Laboratory of Islets of Langerhans, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - Eva Fábryová
- Laboratory of Islets of Langerhans, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - Lud'ka Machová
- Department of Biomaterials and Bioanalogous Polymer Systems, Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Prague, Czech Republic
| | - Jana Kovářová
- Department of Polymer Processing, Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Prague, Czech Republic
| | - František Rypáček
- Department of Biomaterials and Bioanalogous Polymer Systems, Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Prague, Czech Republic
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Ponyrko S, Kovářová J, Kobera L, Matějka L. High-Tg, heat resistant epoxy-silica hybrids with a low content of silica generated by nonaqueous sol-gel process. J Appl Polym Sci 2014. [DOI: 10.1002/app.40899] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sergii Ponyrko
- Department of Nanostructured Polymers and Composites; Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic; Heyrovský Sq. 2 Prague Czech Republic
| | - Jana Kovářová
- Department of Polymer Processing; Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic; Heyrovský Sq. 2 Prague Czech Republic
| | - Libor Kobera
- Department of NMR Spectroscopy; Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic; Heyrovský Sq. 2 Prague Czech Republic
| | - Libor Matějka
- Department of Nanostructured Polymers and Composites; Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic; Heyrovský Sq. 2 Prague Czech Republic
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Patsula V, Petrovský E, Kovářová J, Konefal R, Horák D. Monodisperse superparamagnetic nanoparticles by thermolysis of Fe(III) oleate and mandelate complexes. Colloid Polym Sci 2014. [DOI: 10.1007/s00396-014-3236-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [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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13
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Omastová M, Mičušík M, Fedorko P, Pionteck J, Kovářová J, Chehimi MM. The synergy of ultrasonic treatment and organic modifiers for tuning the surface chemistry and conductivity of multiwalled carbon nanotubes. SURF INTERFACE ANAL 2014. [DOI: 10.1002/sia.5427] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mária Omastová
- Polymer Institute; Dúbravská cesta 9 845 41 Bratislava Slovakia
| | - Matej Mičušík
- Polymer Institute; Dúbravská cesta 9 845 41 Bratislava Slovakia
| | - Pavol Fedorko
- Department of Chemical Physics; Faculty of Chemical and Food Technology, Slovak University of Technology; Radlinského 9 812 37 Bratislava Slovakia
| | - Jürgen Pionteck
- Leibniz Institute of Polymer Research Dresden; Hohe Str. 6 01069 Dresden Germany
| | - Jana Kovářová
- Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic; 162 06 Prague 6 Czech Republic
| | - Mohamed M. Chehimi
- Sorbonne Paris Cité, ITODYS; Univ Paris Diderot; UMR CNRS 7086, 15 rue J-A de Baïf 75013 Paris France
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14
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Macková H, Horák D, Petrovský E, Kovářová J. Magnetic hollow poly(N-isopropylacrylamide-co-N,N′-methylenebisacrylamide-co-glycidyl acrylate) particles prepared by inverse emulsion polymerization. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2609-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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15
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Omastová M, Rychlý J, Trchová M, Kovářová J. Properties and thermal decomposition of polypyrrole prepared in the presence of sodium bis(2-ethylhexyl) sulfosuccinate. Des Monomers Polym 2012. [DOI: 10.1163/1568555042474220] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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16
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Strachota A, Ribot F, Matějka L, Whelan P, Starovoytova L, Pleštil J, Steinhart M, Šlouf M, Hromádková J, Kovářová J, Špírková M, Strachota B. Preparation of Novel, Nanocomposite Stannoxane-Based Organic–Inorganic Epoxy Polymers containing Ionic bonds. Macromolecules 2011. [DOI: 10.1021/ma201178j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Adam Strachota
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - François Ribot
- UPMC, Chimie de la Matière
Condensée de Paris (UMR 7574), Collège de France, 11 place Marcelin Berthelot, 75005 Paris,
France
- CNRS, Chimie de la
Matière
Condensée de Paris (UMR 7574), Collège de France, 11 place Marcelin Berthelot, 75005 Paris,
France
| | - Libor Matějka
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Paul Whelan
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Larisa Starovoytova
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Josef Pleštil
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Miloš Steinhart
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Miroslav Šlouf
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Jiřina Hromádková
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Jana Kovářová
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Milena Špírková
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
| | - Beata Strachota
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovskeho nam. 2, CZ-162 00 Praha, Czech Republic
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Kotek J, Kubies D, Baldrian J, Kovářová J. Biodegradable polyester nanocomposites: The effect of structure on mechanical and degradation behavior. Eur Polym J 2011. [DOI: 10.1016/j.eurpolymj.2011.09.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Luzuriaga S, Kovářová J, Fortelný I. Stability of model recycled mixed plastic waste compatibilised with a cooperative compatibilisation system. Polym Degrad Stab 2011. [DOI: 10.1016/j.polymdegradstab.2011.02.021] [Citation(s) in RCA: 8] [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] [Indexed: 11/25/2022]
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19
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Šálek P, Korecká L, Horák D, Petrovský E, Kovářová J, Metelka R, Čadková M, Bílková Z. Immunomagnetic sulfonated hypercrosslinked polystyrene microspheres for electrochemical detection of proteins. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12475g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hetflejš J, Šabata S, Podešva J, Kovářová J, Prokůpek L, Netopilík M, Spěváček J, Sýkora J. Novel stabilisers acting simultaneously as molecular-weight regulators in soluble elastomeric polyurethanes. Polym Degrad Stab 2010. [DOI: 10.1016/j.polymdegradstab.2009.12.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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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21
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Kovářová J, Svobodová Z. Can thiol compounds be used as biomarkers of aquatic ecosystem contamination by cadmium? Interdiscip Toxicol 2009; 2:177-83. [PMID: 21217850 PMCID: PMC2984109 DOI: 10.2478/v10102-009-0013-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2009] [Revised: 08/27/2009] [Accepted: 08/30/2009] [Indexed: 12/17/2022] Open
Abstract
Due to anthropogenic activities, heavy metals still represent a threat for various trophic levels. If aquatic animals are exposed to heavy metals we can obviously observe considerable toxicity. It is well known that an organism affected by cadmium (Cd) synthesize low molecular mass thiol compounds rich in cysteine (Cys), such as metallothioneins (MT) and glutathione (GSH/GSSG). The aim of this study was to summarize the effect of Cd on level of thiol compounds in aquatic organisms, and evaluate that the concentrations of thiol compounds are effective indicators of Cd water pollution and explain their potential use in biomonitoring applications.
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Affiliation(s)
- Jana Kovářová
- University of Veterinary and Pharmaceutical Sciences Brno, Faculty of Veterinary Hygiene and Ecology, Department of Veterinary Public Health and Toxicology, 612 42 Brno, Czech Republic
| | - Zdeňka Svobodová
- University of Veterinary and Pharmaceutical Sciences Brno, Faculty of Veterinary Hygiene and Ecology, Department of Veterinary Public Health and Toxicology, 612 42 Brno, Czech Republic
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Trchová M, Konyushenko EN, Stejskal J, Kovářová J, Ćirić-Marjanović G. The conversion of polyaniline nanotubes to nitrogen-containing carbon nanotubes and their comparison with multi-walled carbon nanotubes. Polym Degrad Stab 2009. [DOI: 10.1016/j.polymdegradstab.2009.03.001] [Citation(s) in RCA: 150] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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23
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Horák D, Pollert E, Trchová M, Kovářová J. Magnetic poly(glycidyl methacrylate)-based microspheres prepared by suspension polymerization in the presence of modified La0.75Sr0.25MnO3 nanoparticles. Eur Polym J 2009. [DOI: 10.1016/j.eurpolymj.2008.12.030] [Citation(s) in RCA: 24] [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] [Indexed: 10/21/2022]
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24
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Podešva J, Kovářová J, Hrdličková M, Netopilík M. Stabilization of polyurethanes based on liquid OH-telechelic polybutadienes: Comparison of commercial and polymer-bound antioxidants. Polym Degrad Stab 2009. [DOI: 10.1016/j.polymdegradstab.2009.01.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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25
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Erdélyiová A, Győryová K, Gyepes R, Halás L, Kovářová J. Synthesis, spectral, thermal and structural study of bis(2-bromobenzoato-O,O′)-bis(methyl-3-pyridylcarbamate-N)-zinc(II). Polyhedron 2009. [DOI: 10.1016/j.poly.2008.09.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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26
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Abshinova MA, Kazantseva NE, Sáha P, Sapurina I, Kovářová J, Stejskal J. The enhancement of the oxidation resistance of carbonyl iron by polyaniline coating and consequent changes in electromagnetic properties. Polym Degrad Stab 2008. [DOI: 10.1016/j.polymdegradstab.2008.07.008] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [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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27
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Hradil J, Sysel P, Brožová L, Kovářová J, Kotek J. Heterogeneous membranes based on a composite of a hypercrosslinked microparticle adsorbent and polyimide binder. REACT FUNCT POLYM 2007. [DOI: 10.1016/j.reactfunctpolym.2007.02.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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29
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Kráčalík M, Studenovský M, Mikešová J, Kovářová J, Sikora A, Thomann R, Friedrich C. Recycled PET-organoclay nanocomposites with enhanced processing properties and thermal stability. J Appl Polym Sci 2007. [DOI: 10.1002/app.26858] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Konyushenko EN, Stejskal J, Trchová M, Hradil J, Kovářová J, Prokeš J, Cieslar M, Hwang JY, Chen KH, Sapurina I. Multi-wall carbon nanotubes coated with polyaniline. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.05.059] [Citation(s) in RCA: 216] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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31
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32
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Strachota A, Kroutilová I, Kovářová J, Matějka L. Epoxy Networks Reinforced with Polyhedral Oligomeric Silsesquioxanes (POSS). Thermomechanical Properties. Macromolecules 2004. [DOI: 10.1021/ma048448y] [Citation(s) in RCA: 178] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Adam Strachota
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsk Sq. 2, 162 06 Prague 6, Czech Republic
| | - Irena Kroutilová
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsk Sq. 2, 162 06 Prague 6, Czech Republic
| | - Jana Kovářová
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsk Sq. 2, 162 06 Prague 6, Czech Republic
| | - Libor Matějka
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsk Sq. 2, 162 06 Prague 6, Czech Republic
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Abstract
Poly(amide-imide)s containing polybutadiene blocks were prepared by reaction of 4,4'-methylenedi(phenyl isocyanate) with trimellitic anhydride and α,ω-diisocyanatopolybutadiene. The polymers were characterized by spectroscopic methods and X-ray diffraction. Incorporation of 5 wt.% of polybutadiene structures into polyimide decreases the temperature of 10% weight loss in nitrogen by 90 °C. Glass transition temperature of the polymer also decreases with the increasing content of soft polybutadiene segments, but the decrease is moderate for the contents higher than 20 wt.%. Broad amorphous halo dominates wide-angle X-ray diffractograms of all the samples, but sharper peaks of a more ordered structure were observed in definite concentration range of polybutadiene blocks. The copolymers are soluble in N-methylpyrrolidone.
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Brede O, Burgers M, Kovářová J, Kúdelka I. Pulse radiolysis and laser flash photolysis studies of stabiliser transformation products. Radiat Phys Chem Oxf Engl 1993 1996. [DOI: 10.1016/0969-806x(95)00079-d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Kovářová J, Rotschová J, Brede O, Burgers M. The effect of transformation products of the antioxidant BHT on the initial stages of thermo- and photo-oxidation of LDPE. CAN J CHEM 1995. [DOI: 10.1139/v95-230] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The effect of individual transformation products of 2,6-di-tert-butyl-4-methylphenol (1, BHT), namely, 2,6-di-tert-butyl-4-hydroxy-2,5-cyclohexadienone (3), 2,6-di-tert-butyl-1,4-benzoquinone (4), and 3,5,3′,5′-tetra-tert-butylstilbenequinone (5), in the course of thermal- and photo-degradation of LDPE has been examined. Oxidative DSC studies combined with oxygen uptake measurements, IR spectroscopy data, and embrittlement tests proved to be sufficiently sensitive to detect differences in the stability of the above-mentioned samples. A comparative study revealed a pronounced stabilizing effect of 5 in LDPE thermooxidation at moderate temperatures (90–100 °C). The stabilizing action of BHT is due in part at least to its coloured transformation product. Keywords: LDPE, thermooxidation, photooxidation, transformation products of phenolic antioxidants.
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Masař B, Vlček P, Kříž J, Kovářová J. Poly(methyl methacrylate)-block-poly(ethyl acrylate) by group transfer polymerization: synthesis and structural characterization. MACROMOL CHEM PHYS 1994. [DOI: 10.1002/macp.1994.021950127] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Lokaj J, Pientka Z, Kovářová J, Bleha M. Membranes based on poly[N-(3-dimethylaminophenyl)maleimide]–poly(2,6-dimethyl-1,4-phenylene oxide) blends for gas separation. J Appl Polym Sci 1992. [DOI: 10.1002/app.1992.070460825] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sedlář J, Kovářová J, Pospíšil J. Antioxidants and stabilisers LXXXIII photoinitiating properties of alkylperoxycyclohexadienones in trimethylcyclohexane—A model of polypropylene. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/0144-2880(81)90012-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Virt J, Rosík L, Kovářová J, Pospišil J. Antioxidants and stabilizers—LXXV. Effect of 2,6-ditert.-butyl-4-methylphenol on the photooxidation of high-impact polystyrene. Eur Polym J 1980. [DOI: 10.1016/0014-3057(80)90211-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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