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Differences in nuclear RNA labelling patterns of BURKITT lymphoma, leukaemic lymphosarcoma and various human leukaemias

Unterschiedliche Markierung von nuclearer RNA aus Zellen des Burkitt-Lymphoms, leukämischer Lymphosarkomatose und verschiedenen menschlichen Leukämieformen

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Summary

Nuclear RNA was isolated from citric acid nuclei derived from AML, CML, CLL, leukaemic lymphosarcoma and BURKITT lymphoma cells after 6 hours incubation with32P-orthophosphate in a phosphate-free medium. In fractionations on sucrose density gradients, marked differences were found in the distribution of the32P-radioactivity mainly in the 45S fraction containing the ribosomal precursor RNA. The lowest specific activities of nuclear 45S RNA were found in CML; very high labelling accurred in cells of AML, leukaemic lymphosarcoma and BURKITT lymphoma. In CLL cells which are known for lack in DNA synthesis, pre-ribosomal 45S and 35S RNA were labelled to a remarkable extent. Studies are in progress in order to define possible differences in nuclear RNA structures between lymphocytic and granulocytic cell lines.

Zusammenfassung

Aus Zellen des Burkitt-Lymphoms, eukämischer Lymphosarcomatose, chronisch-lymphatischer Leukämie, chronisch-myeloischer und akuter myeloischer Leukämie wurden nach sechsstündiger32P-Markierung in einem phosphatarmen Medium Zellkerne mit Hilfe des Zitronensäure-Verfahrens isoliert und die nucleare RNA mit der heißen Phenol-SDS-Methode extrahiert. Nach Fraktionierung der kernspezifischen Nucleinsäuren über Zucker-Dichtegradienten fanden sich markante Unterschiede in der32P-Radioaktivitätsverteilung. Insbesondere war eine differente Markierung der nuclearen 45S RNA, welche als Vorläufer ribosomaler 28S und 18S RNA gilt, festzustellen.

Die niedrigsten spezifischen Aktivitäten des ribosomalen Vorläufers fanden sich bei der CML, die höchsten bei AML, leukämischem Lymphosarkom und Burkitt-Tumor. Bemerkenswert erscheint die aktive Synthese präribosomaler (45S/35S) RNA in Zellen der CLL, deren DNA-Syntheserate äußerst niedrig ist. Zur Klärung der Frage, ob die im Nucleolus der unreifen Zellen gebildeten hochmolekularen Nucleinsäuren quantitative oder qualitative Unterschiede zwischen myeloischen und lymphatischen Zellen aufweisen, sind strukturchemische Untersuchungen im Gange.

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  1. Innere Universitätsklinik und Poliklinik (Tumorforschung) Klinikum Essen, Germany

    S. Seeber, Ch. Hertenstein & C. G. Schmidt

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  1. S. Seeber
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  2. Ch. Hertenstein
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  3. C. G. Schmidt
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Mit Unterstützung durch das Landesamt für Forschung, Nordrhein-Westfalen.

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Seeber, S., Hertenstein, C. & Schmidt, C.G. Differences in nuclear RNA labelling patterns of BURKITT lymphoma, leukaemic lymphosarcoma and various human leukaemias. Klin Wochenschr 51, 680–684 (1973). https://doi.org/10.1007/BF01468173

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