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  • 1
    Keywords: Rb ; PKB/AKT ; lipid ; mechanism of action ; erufosine ; synergistic combinations ; pAkt ; BCR-ABL ; CML ; caspases ; KINASE INHIBITOR ; LEVEL ; INCREASE ; SUBSTRATE ; AGENT ; signaling ; CASPASE ; INHIBITORS ; protein expression ; MAMMALIAN-CELLS ; PROTEIN-KINASE-C ; leukemia ; FUSION ; LINE ; MEMBRANE ; SIGNAL-TRANSDUCTION ; COMPONENT ; ALKYLPHOSPHOCHOLINES ; ANTILEUKEMIC EFFICACY ; CELL-LINE ; chemotherapy ; cell lines ; p27 ; ENTRY ; HEALTH ; ASSAY ; PROGRESSION ; SIGNAL ; treatment ; TYROSINE KINASE INHIBITOR ; CYCLE ; CELL-LINES ; CELL-CYCLE ; cell cycle ; PROTEIN-KINASE ; signal transduction ; INDUCTION ; REDUCTION ; TYROSINE KINASE ; COMBINATION ; KINASE ; PATHWAY ; THERAPY ; PATHWAYS ; CELL ; INHIBITOR ; APOPTOSIS ; EXPRESSION ; CELLS ; DISEASE ; NEW-YORK ; LINES ; cell line ; DRUG ; PROTEINS ; PROTEIN ; TRANSDUCTION ; cell signaling ; MECHANISM ; PATIENT
    Abstract: The ether lipid analog erufosine (erucylphospho-N,N,N,- trimethylpropylammonium, ErPC3) has high activity against leukemic cells without affecting the normal hematopoiesis. It belongs to the group of alkylphosphocholines (APC) that are inhibitors of protein kinase C and phospholipase C. However, the mechanism of action of erufosine remains rather unclear. We focused on combination effects with the tyrosine kinase inhibitor imatinib mesylate (gleevec, former STI-571 or CGP-57148) against two chronic myeloid leukemia (CML)-derived cell lines (K-562 and BV-173). The influence of erufosine on proteins involved in the phosphatidylinositol-3-phosphate pathway and on expression of the retinoblastoma protein Rb was studied, the latter being a key component for cell cycle entry and progression in mammalian cells. The consecutive treatment of K-562 and BV-173 cells with erufosine (2.5, 5, 15, 30 mu M) and imatinib mesylate (0.05, 0.1 mu M) led to synergism as measured by the MTT-dye reduction assay and this is reason to hypothesize that such combinations could be beneficial for relapsed patients with drug-resistant disease. Whole cell lysates from K-562 and BV-173 were investigated for the expression of Rb, PKB/Akt, pAkt, and p27 by Western blot. Erufosine caused decreases of pAkt and CML fusion protein p210 (BCR-ABL) protein expression, but induced the Rb protein expression in K-562 cells. A parallel increase in p27 level was observed after 24 and 48 h treatment. These alterations in signal transduction could be an explanation for the drug interaction found. Furthermore, Rb is a substrate of caspases and is cleaved during apoptosis as already evidenced for BV-173 cells. Our experimental findings suggest that erufosine acts through induction of changes in protein signaling and especially through Rb induction. This unique mode of action makes it an attractive partner for combination therapies, for example, in combination with imatinib mesylate for treatment of CML
    Type of Publication: Book chapter
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  • 2
    Keywords: CELLS ; LINES ; bone marrow ; BONE-MARROW ; MOUSE ; ALKYLPHOSPHOCHOLINES ; CYCLOPHOSPHAMIDE ; CHROMOSOMES ; thymus ; bone marrow cells ; ERUCYLPHOSPHOCHOLINE-INDUCED APOPTOSIS ; Miltefosine ; spermatogenic cells
    Type of Publication: Journal article published
    PubMed ID: 16079990
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  • 3
    ISSN: 1011-1344
    Keywords: Haematoporphyrin derivative ; mouse adenocarcinoma. ; photodynamic therapy
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A procedure for platinum and gold determination utilizing, neutron activation combined with radiochemical separation, has been developed. The reaction198Pt (n, ′γ)199 $$Pt\xrightarrow{\beta }$$ is used for Pt determination. Four procedures for gold separation are examined: (1) adsorption on untreated polyurethane foam (UPF). (2) extraction with dibutyl sulphide. (3) reduction of gold to elementary state in conc. H2SO4, and extraction of gold as diethyldithiocarbamate complex. The extraction with Cu(DDC)2 is chosen as the most suitable process and applied to platinum and gold determinations in Bowen's Kale and mice organs, previously treated with Biocisplatinum® specimens.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Natural, activated, and modified microzeolites were studied individually and in combination with ammonium sulfamate as high-melting dispersed additives. The strength - deformation properties of poly(vinyl chloride) were improved within the interval of 3-8 wt % additive. The strengthening effect due to the considered dispersed additives can be ascribed to the optimal adhesive interaction of the phase-boundary surface and to the formation of a partially ordered dispersed phase. The tetrahedral configuration of the modified microzeolite that contains 3.5-4% zinc in its crystal lattice remains unchanged, but exhibits a reduced birefringence. These relationships are of exceptional importance for the use of poly(vinyl chloride). The introduction of certain amounts of the additives improves the melt flow of the polymer and facilitates the processibility of the compositions. © 1993 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The influence of natural, activated, and modified microzeolite with the general formula Me2/m · Al2O3 · nSiO2 · pH2O (where Me = Fe3+, Ca2+, Mg2+, Zn2+, K+, Na+) and an organic additive, such as ammonium sulfamate combined with ammonium sulfate on smoke formation and flammability of suspension poly(vinyl chloride) has been studied in the present work. Microzeolite in native (i.e., natural), activated, and modified forms has been found to possess both fire-retardant and smoke-suppressant effects in solid poly(vinyl chloride) compositions. Such effects have been best revealed by modified microzeolite containing 3,5-4% zinc. On the other hand, the ammonium sulfamate combined with ammonium sulfate is believed to act as a strong smoke-suppressant additive. Thermogravimetric examinations and limited oxygen index measurements show that microzeolite acts as a fireresistant and smoke-suppressant additive predominantly in the condensed phase. The ammonium sulfamate in combination with ammonium sulfate gives evidence of the same effects, mostly in the gaseous phase.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 609-613 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Triethanolammonium salts of nitrosulfonic acids (TEA-I) based on nitro-oligomers of polyisoprene rubber and triethanolammonium hydrogen sulfite were obtained. The reaction was carried out in an aqueous dioxane medium at pH = 6 to 7 and T = 40 to 80°C for 4 to 8 h. The TEA-I yield depends on the pH of the medium, the temperature, the duration of the process and the purity of triethanolamine. TEA-I posses surface-active properties. They were tested as brightening agents in sulfate cadmium electrolytes.
    Notes: Synthetisiert wurden Triethanolammoniumsalze von Nitrosulfonsäuren (TEA-I) auf der Grundlage von Nitrooligomeren aus Polyisoprenkautschuk und Triethanolammoniumhydrogensulfit. Die Umsetzung erfolgte in Wasser/Dioxan bei pH = 6 bis 7, T = 40 bis 80°C und einer Kontaktdauer von 4 bis 8 h. Die TEA-I-Ausbeute hängt vom pH-Wert des Mediums, der Temperatur, der Kontaktdauer und dem Reinheitsgrad des Triethanolamins ab. Die TEA-I haben oberflächenaktive Eigenschaften. Sie wurden auf ihre Einsatzfähigkeit als Glanzbildner in Sulfat-Cadmium-Elektrolyten getestet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mittels eines kombinierten DTA-Verfahrens wurde der Einfluß von als Antipyren in einer Polychloroprenkomposition auf ‘Byprene-210’-Basis eingeführten Ammoniumsulphaminaten (AS) in Verbindung mit Antimontrioxid (AO) und Chlorparaffin (ChP) untersucht. Nach erfolgreicher Untersuchung der beobachteten thermischen und Brennbarkeitseigenschaften wird angenommen, daß AS und AO einem additiven Einfluß aufweisen. Es wird ein optimaler Bereich für die AS-Konzentration gefunden, in dem es möglich ist, AO in den untersuchten Polychloroprenkompositionen zu substituieren.
    Notes: Abstract The effects of ammonium salt of sulphaminic acid (AS), introduced as antipyrene in polychloroprene compositions based on ‘Byprene-210’ in combination with antimony trioxide (AO) and chloroparaffin (ChP) are studied by means of a combined dynamic thermal analysis. After successive examination of the obtained thermal and flammability characteristics, it is assumed that AS and AO exhibit additive influence. The optimal range of concentrations of AS for which it is possible to substitute AO in the investigated polychloroprene compositions is established.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Einwirkung eines Nitriergemisches auf Butadienstyrenkautschuk wurden alkylaromatische Nitrooligomerderivate hergestellt. Die Umsetzung erfolgte in Dichlorethanlösung in 2 bis 5 h bei Temperaturen zwischen 20 und 50 °C. Die funktionelle Zusammensetzung der Nitrooligomere wurde mittels Infrarotspektroskopie in Abhängigkeit von der Temperatur, der Reaktionsdauer und der Zusammensetzung des Nitriergemisches bestimmt. Es wurde gefunden, daß bei hoher NO2+- Konzentration die Nitrierung überwiegend am aromatischen Ring erfolgt, während bei niedriger Konzentration die Nitrierung der Kohlenwasserstoffkette überwiegt.
    Notes: By reaction of butadiene styrene rubber with a nitrating mixture alkylaromatic nitrooligomer derivatives are formed. The reaction was carried out in dichloroethane solution for 2 to 5 h at temperature 20 to 50°C. The functional composition of the nitrooligomers in dependence on temperature, reaction time, and composition of the nitrating mixture was determined by means of infrared spectroscopy. It was established that at high concentrations of NO2+ the nitration of the aromatic ring is predominant, while at low concentrations the nitration of the hydrocarbon chain prevails.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The influence of ammonium sulfamate (AS) independently or in a combination with antimony trioxide (AO) and chloroparaffin (ChP)-70% chlorine, on the oxygen index (OI) values as a flammability indicator, as well as on some physicomechanical and thermal characteristics of filled and unfilled compositions for cables based on chloroprene rubber (ChR), is studied here. It is found out that, at definite concentrations, AS and AO reveal an additive effect as fire retardants, decreasing the rate of heat rlease on heating. AS reveals a plasticizing effect as well.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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