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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Annals of hematology 38 (1979), S. 447-455 
    ISSN: 1432-0584
    Keywords: Lymphozyten ; Purinstoffwechsel ; Adenin ; Guanin ; Hypoxanthin ; Lymphocytes ; Purine metabolism ; Adenine ; Guanine ; Hypoxanthine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In peripheral human blood lymphocytes the uptake and metabolism of adenine, guanine, and hypoxanthine was investigated. This was achieved by incubation of purified lymphocytes with14C-purine bases, separation of cells from the incubation medium by a rapid filtration technique, and subsequent separation of the acid soluble material by thin-layer chromatography. No preferential uptake for one of the purine bases was observed. In all cases only traces of14C-purine bases not added originally and labeled nucleosides could be demonstrated. Approximately 2/3 of adenine and 1/2 of guanine or hypoxanthine were converted to nucleotides. Separation of formed nucleotides showed that adenine and guanine were metabolized mainly to their corresponding nucleotides; hypoxanthine was converted to a considerable amount to adenine nucleotides and only to a small proportion into its own nucleotides. These results demonstrate the predominance of adenine nucleotide formation in normal human lymphocytes.
    Notes: Zusammenfassung In peripheren menschlichen Lymphozyten wurden die Aufnahme und der Stoffwechsel von Adenin, Guanin und Hypoxanthin untersucht. Die gereinigten Lymphozyten wurden mit14C-markierten Purinbasen inkubiert und anschlie\end vom Inkubationsmedium mittels rascher Filtrationstechnik getrennt. Eine bevorzugte Aufnahme einer der Purinbasen konnte nicht beobachtet werden. Die dünnschichtchromatographische Auftrennung der säurelöslichen Metabolite ergab kaum eine Bildung von Nukleosiden und anderen als den zugesetzten Purinbasen. Adenin wurde zu ca. 2/3, Guanin und Hypoxanthin hingegen zu etwa der Hälfte zu Nukleotiden aufgebaut, wobei Adenin und Guanin hauptsächlich zu ihren eigenen, Hypoxanthin jedoch zu Adeninnukiektiden metabolisiert wurde. Die Ergebnisse weisen auf die bevorzugte Bildung von Adeninnukleotiden in normalen menschlichen Lymphozyten.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0533
    Keywords: Glioma ; Macrophages ; Microglia ; Fc-receptors ; Complement receptors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cryostat sections of 12 gliomas and of 3 peritumoral brain tissue samples were investigated for mononuclear cell infiltration by immunohistochemistry, concentrating on cells expressing monocyte/macrophage markers. Only low numbers of T cells were detected in the tumors, whereas in average 20%–30% of all cells present in the samples were recognized by various macrophage markers. These cells carried surface epitopes with known function, like Fc-γ (Fcg) and complement receptors. Microglial cells, in comparison to typical debris laden macrophages, were only recognized by a restricted panel of macrophages markers (anti-Fcg receptors 1, 2, 3, complement receptor CR3, HLA DR, common leucocyte antigen CD45 and the monocyte marker RM3/1). In peritumoral tissue mainly dendritic, microglia-like cells were present, which revealed decreased expression of antigens CD4, RM3/1 and Fcg receptors in comparison to those in gliomas. A significant positive correlation was found between the number of RM3/1 or CR3 (CD11b)-positive cells and the proliferation rate of the tumors as documented by the number of bromodeoxyuridine-positive or Ki-67+ cells.
    Type of Medium: Electronic Resource
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