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  • 1965-1969  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 47 (1969), S. 1118-1119 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The influence of some substances used in combination therapy of Morbus Hodgkin — Vinblastine, phenylbutazone, prednisolone and procarbazine — on ATP-nucleosidtransferases of leukemic cells have been examinated. Procarbazine and prednisolone do not influence the reactions of nucleosidephosphorylation. In contrary phenylbutazone and especially vinblastine are diminishing the amounts of triphosphates in leukemic cells.
    Notes: Zusammenfassung Einige beim Morbus Hodgkin meist im Sinne einer Kombinationstherapie angewendeten Substanzen—Vinblastin, Phenylbutazon, Procarbazin und Prednisolon — wurden auf ihren Einfluß auf die ATP-Nucleosidphosphotransferasen von Leukosezellen geprüft. Procarbazin und Prednisolon beeinflussen die Phosphorylierungsreaktionen nicht. Hingegen nehmen unter Phenylbutazon und besonders unter Vinblastin die Mengen der gebildeten Triphosphate ab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Ascites cells derived from various transplantation tumours and leukemic lymphocytes have been employed to study the in-vitro effects of E. coli L-asparaginase on protein and nucleic acid biosynthesis. Bovine lymphocytes obtained from a cow suffering from chronic lymphatic leukemia showed a marked inhibition of14C-thymidine incorporation not reversible by L-asparagine and L-glutamine addition. With Walker ascites and Yoshida ascites of the rat, this effect has been found to be accompanied by a comparable inhibition of14C-leucine uptake, while in cells from mouse crocker ascites under the same conditions only14C-leucine incorporation was decreased. Although some specific investigations have been performed on nucleic acid biosynthesis in presence of L-asparaginase, the mechanisms of action — with respect to the rapid inhibition of14C-thymidine uptake into lymphatic cells — are still unknown.
    Notes: Zusammenfassung Die Wirkung von E. coli-L-Asparaginase auf die Nucleinsäure- und Proteinbiosynthese wurde an Zellsuspensionen lymphatischer Leukämiezellen und verschiedener Transplantationstumoren untersucht. Hierbei wurde beobachtet, daß dieses Enzym eine deutliche Senkung des14C-Thymidineinbaus an Leukämiezellen des Rindes hervorruft, ein Effekt, welcher durch Zusatz von L-Asparagin und L-Glutamin nicht aufhebbar war. Bei Zellen des Walker- und Yoshida-Ascitestumors der Ratte fanden sich eine Hemmung der14C-Thymidin- und14C-Leucininkorporation, während die L-Asparaginase bei Asciteszellen des Crocker-Sarkoms der Maus lediglich eine Senkung des14C-Leucineinbaus bewirkte. Die Ursache für das Verhalten des14C-Thymidineinbaus bei bestimmten Tumorzellen bleibt zunächst ungeklärt.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 73 (1969), S. 67-74 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Einwirkung von Vinblastin und Vincristin auf vier zellfreie Systeme von leukämischen Rinderlymphocyten wird beschrieben: DNS-abhängige RNS-Polymerase, Proteinbiosynthese und Uridin-Kinase. Beide Alkaloide inaktivieren die pH-5. Enzymfraktion der Proteinbiosynthese und hemmen stark die DNS-abhängige RNS-Poly-merase. Die DNS-Polymerase und die Uridin-Kinase werden hingegen nur schwach beeinflußt.
    Notes: Summary The influence of vinblastine and vincristine on four cell free systems derived from leukemic lymphocytes is described. The systems used were: DNA dependent RNA polymerase, DNA polymerase, uridine kinase and protein-biosynthesis. Both alkaloids strongly inactivate pH-5-enzymes and DNA-dependent RNA polymerase. In contrast, DNA polymerase and uridine kinase are not influenced to a great extent.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 71 (1968), S. 361-367 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Vinblastin senkt den 14C-Leucin-Einbau in Asciteszellen. Vinblastin und Vincristin hemmen die DNS-, RNS-und besonders die Proteinbiosynthese in leukämischen Rinderlymphocyten und führen auch in zellfreien Systemen zu einer Hemmung der Proteinbiosynthese. Im Bereich des Nucleinsäurestoffwechsels inaktivieren sie vornehmlich die DNS-abhängige RNS-Polymerase, in Ganzzellen setzen sie den intracellulären Nucleosidgehalt herab.—Das zum Vergleich eingesetzte Colchicin besitzt ähnliche Angriffspunkte.
    Notes: Summary 14C-leucine-incorporation by ascites cells is diminished by Vinblastine. RNA-, DNA-and especially proteinbiosynthesis of leukemic lymphocytes are inhibited by Vinblastine and Vincristine. Further, a similar mode of inhibition of proteinbiosynthesis as well as the inactivation of DNA dependent RNA-Polymerase was displayed by cell free systems. The intracellular content of nucleosides was reduced in intact cells.—Similar results have been obtained by employing Colchicine as a reference substance.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 72 (1969), S. 137-143 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der Einfluß des 4-Hydroxy-pentenals auf die Biosynthese von monomeren und polymeren Nucleotiden wird anhand zellfreirr Systeme untersucht. Es werden vor allem Angriffspunkte an der Nucleotidphosphorylierung und an der DNA-Polymerase gefunden. Bei Untersuchungen der Wirksamkeit des HPE in einem zellfreien Ribonucleotid-Reduktase-System kann kein deutlicher Effekt an der ADP-Reduktase gesehen werden. Wie die Biosynthese der DNS eines natürlich proliferierenden Gewebes in Gegenwart von HPE verläuft, wird an regenerierender Rattenleber geprüft.
    Notes: Summary Cell free systems have been employed to study the effect of 4-hydroxy-pentenale on monomer and polymer nucleotide biosynthesis. It appears that the phosphorylation of nucleotides as well as DNA polymerase is affected by HPE. However, this compound caused no significant inhibition of ADP-reductase-system. Of further interest seemed to be the DNA synthesis of regenerating rat liver in presence of HPE.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 25 (1969), S. 489-490 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ascites tumour cells have been employed to study the reactivity of Zn++ on nucleic acid biosynthesis. 10−4 M Zn++ caused a selective inhibition of DNA synthesis of intact cells. The rate of RNA- and protein-biosynthesis, however, remained unchanged. The activity of DNA polymerase as well as DNA dependent RNA polymerase was strongly affected by Zn++ in vitro.
    Type of Medium: Electronic Resource
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