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Jesus Vazquez et al.
Journal of medicinal chemistry, 50(9), 2137-2143 (2007-03-31)
We report on the design, synthesis, and evaluation of a series of furanyl-salicyl-nitroxide derivatives as effective chemical probes for second-site screening against phosphotyrosine phosphatases (PTPs) using NMR-based techniques. The compounds have been tested against a panel of PTPs to assess
Natalia Pieńkowska et al.
Aging, 12(2), 1910-1927 (2020-01-22)
The study was aimed at evaluation of the role of secondary oxidative stress in the stress-induced premature senescence (SIPS) of human fibroblasts induced by H2O2. Two fibroblast lines were used: lung MRC-5 and ear H8F2p25LM fibroblasts. The lines differed considerably
C Kroll et al.
Free radical biology & medicine, 26(7-8), 850-857 (1999-05-08)
Metabolism of different nitroxides with piperidine structure used as spin labels in electron spin resonance (ESR) studies in vitro and in vivo was investigated in human keratinocytes of the cell line HaCaT by GC and GC-MS technique combined with S-band
Sandhya Xavier et al.
Biochimica et biophysica acta, 1573(2), 109-120 (2002-10-26)
Modulation of radiation- and metal ion-catalyzed oxidative-induced damage using plasmid DNA, genomic DNA, and cell survival, by three nitroxides and their corresponding hydroxylamines, were examined. The antioxidant property of each compound was independently determined by reacting supercoiled DNA with copper
Spin-Labeled Dendrimers in EPR Imaging with Low Molecular Weight Nitroxides.
Alexander T. Yordanov et al.
Angewandte Chemie (International ed. in English), 40(14), 2690-2692 (2001-07-18)
Md Amran Hossain et al.
Journal of drug targeting, 22(7), 638-647 (2014-06-24)
Silica nanoparticles were synthesized via a sol-gel method in which tetraethyl orthosilicate was hydrolyzed by the alkaline core of the nitroxide radical-containing nanoparticle (RNP). The silica nanoparticles were successively captured in the RNP core to obtain silica/RNP nanocomposite (siRNP). Alternatively
Agnieszka Marczak et al.
Cell biology international, 30(2), 127-132 (2005-11-08)
Doxorubicin (DOX) and idarubicin (IDA) are anthracycline antibiotics, widely used in human cancer treatment. The present study addressed the effects of these two drugs on lipid bilayer fluidity, protein conformation and microviscosity in erythrocytes from acute myeloid leukaemia patients, using
M C Krishna et al.
Free radical biology & medicine, 17(5), 379-388 (1994-11-01)
Nitroxides are cell-permeable, stable radicals that react readily with paramagnetic species such as transition metals or short-lived free radicals, though not generally with diamagnetic molecules. Nitroxides can undergo one-electron selective redox reactions and thereby potentially modify the activity of cytotoxic
Darja Jaušovec et al.
Carbohydrate polymers, 116, 74-85 (2014-12-03)
The chemo-enzymatic modification of cellulose nanofibers (CNFs) using laccase as biocatalysts and TEMPO or 4-Amino-TEMPO as mediators under mild aqueous conditions (pH 5, 30 °C) has been investigated to introduce surface active aldehyde groups. 4-Amino TEMPO turned out to be
Gabriela Ionita et al.
Soft matter, 11(46), 8968-8974 (2015-09-25)
The formation of alginate gel from low molecular weight alginate and very low molecular weight alginate in the presence of divalent cations was investigated using Electron Paramagnetic Resonance (EPR) spectroscopy. The transition from sol to gel in the presence of
Robert Lyzeń et al.
Archives of microbiology, 183(3), 203-208 (2005-02-18)
Recent studies indicated that bioluminescence of the marine bacterium Vibrio harveyi may both stimulate DNA repair and contribute to detoxification of deleterious oxygen derivatives. Therefore, it was also proposed that these reactions can be considered biological roles of bacterial luminescence
A O Salman et al.
Journal of magnetic resonance (San Diego, Calif. : 1997), 134(1), 1-6 (1998-09-19)
A weak field DNP study of 4-hydroxy-2,2,6, 6-tetramethyl-1-piperidinyloxy (4-hydroxy-TEMPO), 4-amino-2,2,6, 6-tetramethyl-1-piperidinyloxy (4-amino-TEMPO), and 2, 2-Di(4-tert-octylphenyl)-1-picrylhydrazyl (DPPH) free radicals invarious solvents was performed at 1.53 mT using a doubleresonance spectrometer. pi transitions, in which the RF fieldhas a component perpendicular to
Tareq Taha Jubeh et al.
Journal of drug targeting, 14(3), 155-163 (2006-06-07)
Superoxide dismutase (SOD), 4-amino tempol (tempamine, denoted as TMN) and catalase were encapsulated into negatively charged liposomes. The activity of the antioxidants against dinitrobenzenesulfonic acid (DNBS) induced colitis was tested in the rat and compared to the anti-inflammatory activity of
H Dragutan et al.
Bioorganic & medicinal chemistry, 4(10), 1577-1583 (1996-10-01)
Stable free mono- and diradicals containing reactive primary or secondary amino groups in the side-chain have been synthesized by transesterification of amino-substituted esters with paramagnetic alcohols or from spin-labeled acid derivatives and amines. In the second approach the new radical
Pablo Kizelsztein et al.
Journal of neuroimmunology, 213(1-2), 20-25 (2009-07-01)
Reactive oxygen species are involved in the pathogenesis of multiple sclerosis (MS), Parkinson's disease and neurodegenerative diseases. Here we report that Tempamine (TMN), a stable radical with antioxidant and proapoptotic activities, when encapsulated in the intraliposome aqueous phase of pegylated
Keren Turjeman et al.
PloS one, 10(7), e0130442-e0130442 (2015-07-07)
The present study shows the advantages of liposome-based nano-drugs as a novel strategy of delivering active pharmaceutical ingredients for treatment of neurodegenerative diseases that involve neuroinflammation. We used the most common animal model for multiple sclerosis (MS), mice experimental autoimmune
R Zhang et al.
Archives of biochemistry and biophysics, 312(2), 385-391 (1994-08-01)
Nitroxides stable radicals are unreactive toward most diamagnetic molecules, but readily undergo one-electron redox reactions with paramagnetic species such as free radicals and transition metals, thus serving as cell-permeable antioxidants. The cytotoxicity of juglone (5-hydroxy-1,4-naphthoquinone), like that of other naphthoquinones
Jianfei Jiang et al.
The Journal of pharmacology and experimental therapeutics, 320(3), 1050-1060 (2006-12-21)
Suppression of mitochondrial production of reactive oxygen species is a promising strategy against intrinsic apoptosis typical of degenerative diseases. Stable nitroxide radicals such as 4-hydroxy-2,2,6,6-tetramethyl piperidine-1-oxyl (TEMPOL) and its analogs combine several important features, including recycleability, electron acceptance from respiratory
J Czepas et al.
Cell biology and toxicology, 24(1), 101-112 (2007-07-05)
The piperidine nitroxides Tempamine and Tempace have been studied for their effect on doxorubicin (DOX) and hydrogen peroxide (H(2)O(2)) cytotoxicity in immortalized B14 cells, a model for neoplastic phenotype. The significance for nitroxide performance of the substituent in position 4
Matthias A Fügi et al.
Antimicrobial agents and chemotherapy, 54(3), 1042-1046 (2009-12-24)
Peroxidic antimalarials such as the semisynthetic artemisinins are critically important in the treatment of drug-resistant malaria. Nevertheless, their peroxide bond-dependent mode of action is still not well understood. Using combination experiments with cultured Plasmodium falciparum cells, we investigated the interactions
Babita Shashni et al.
Biomaterials, 134, 143-153 (2017-05-02)
Early diagnosis of metastatic cancers could greatly limit the number of cancer-associated deaths. Aberrant surface expression of sialic acid (hypersialylation) on tumors correlating with metastatic incidence and its involvement in tumorigenesis and progression is widely reported; hence detection of hypersialylated
Larissa N Ikryannikova et al.
Magnetic resonance in chemistry : MRC, 48(5), 337-349 (2010-03-13)
An explicit DFT modeling of water surroundings on the electron paramagnetic resonance properties of 4-amino-2,2,6,6-tetramethyl-piperidine-N-oxyl (TA) has been performed. A stepwise hydration of TA is accompanied with certain changes in geometrical parameters (bond lengths and angles) and redistribution of partial
Hanna Szpilewska et al.
Current microbiology, 47(5), 379-382 (2003-12-13)
The origin and function of bioluminescence was considered a problematic question of the Charles Darwin theory. Early evolution of bacterial luminescence and its current physiological importance seem to be especially mysterious. Recently, it was proposed that stimulation of DNA repair
Boris V Trubitsin et al.
Journal of magnetic resonance (San Diego, Calif. : 1997), 163(2), 257-269 (2003-08-14)
We present a method for measuring the transmembrane pH difference (deltapH=pHin-pHout) in chloroplasts with a spin label TEMPAMINE (4-amino-2,2,6,6-tetramethylpiperidine-1-oxyl) accumulating inside the thylakoids in response to generation of deltapH. Experiments with chloroplasts suspended in the media of different osmolarity demonstrated
D A Hall et al.
Science (New York, N.Y.), 276(5314), 930-932 (1997-05-09)
Large dynamic nuclear polarization signal enhancements (up to a factor of 100) were obtained in the solid-state magic-angle spinning nuclear magnetic resonance (NMR) spectra of arginine and the protein T4 lysozyme in frozen glycerol-water solutions with the use of dynamic
H Nohl et al.
Protoplasma, 217(1-3), 9-14 (2001-12-06)
Ubiquinone is inhomogeneously distributed in subcellular biomembranes. Apart from mitochondria, where ubiquinone was demonstrated to exert bioenergetic and pathophysiological functions, unusually high levels of ubiquinone were also reported to exist in Golgi vesicles and lysosomes. In lysosomes the interior differs
Raj Kumar Roy et al.
Nature communications, 6, 7237-7237 (2015-05-27)
Biopolymers such as DNA store information in their chains using controlled sequences of monomers. Here we describe a non-natural information-containing macromolecule that can store and retrieve digital information. Monodisperse sequence-encoded poly(alkoxyamine amide)s were synthesized using an iterative strategy employing two
Tareq Taha Jubeh et al.
Molecular pharmaceutics, 2(1), 2-11 (2005-04-05)
The purpose of the present study was to investigate whether the local prevention of luminal superoxide-mediated biological damage in the rat jejunal mucosa could be achieved by liposomal superoxide dismutase (SOD) and the SOD mimic tempamine (TMN). Cationic liposomes loaded
Yanming Huang et al.
Acute cardiac care, 8(4), 210-216 (2006-12-13)
Tempamine is one of new class of antioxidant agents, the nitroxides, which have shown a wide range of biological effects like suppressing free radical driven reactions to maintain cell functions. The objectives of this study were to evaluate the effect
Shin-Nosuke Nishimura et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 23(60), 15050-15058 (2017-08-11)
Precisely incorporating a wide range of structural and functional multiblocks along a polymer backbone is a significant challenge in polymer chemistry and offers promising opportunities to design highly ordered materials, including controlled polymer folding. Herein, a facile and versatile strategy
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