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   <subfield code="a">Nucleolar morphology and rDNA in situ hybridisation in monocytes</subfield>
   <subfield code="h">[Elektronische Daten]</subfield>
   <subfield code="c">[A. Schedle, M. Willheim, A. Zeitelberger, A. Gessl, K. Frauendorfer, C. Schöfer, F. Wachtler, H. Schwarzacher, G. Boltz-Nitulescu]</subfield>
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   <subfield code="a">Summary: The aim of this study was to correlate morphological changes of nucleoli of non-proliferating monocytes to their functional activity, since nucleolar morphology is currently considered as a diagnostic marker for cell proliferation. Monocytes from healthy donors were fractionated by current counterflow centrifugation and kept in culture for 6 days. Cells were stimulated by the addition of 200 units/ml interferon γ (IFNγ). Under this stimulus the monocytes show no proliferation but a strongly augmented expression of type I Fc IgG receptor, human leucocyte antigen DR, human leucocyte antigen DP and human leucocyte antigen DQ. Morphological changes after stimulation included the appearance of multinucleated cells, typical signs of the activation of rRNA synthesis indicated by an increase in nucleolar size, and changes in nucleolar structure such as the appearance of reticulate and compact nucleoli. The number of nucleolus organiser regions (NORs) visualised by in situ hybridisation was compared with the position and number of nucleoli visualised by silverstaining in interphase cells. In comparison with control cultures, activated monocytes show a distinct increase in the number of those NORs that take part in the formation of nucleoli. Our results show that, in non-proliferating activated monocytes, the morphology of nucleoli and the increase of NOR activity are similar to those in proliferating cells. NOR activation is therefore an indicator for cellular activity, but is not necessarily correlated with proliferation.</subfield>
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   <subfield code="a">Nucleolus organiser regions</subfield>
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   <subfield code="a">Silver staining</subfield>
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   <subfield code="u">Histologisch-Embryologisches Institut der Universität Wien, Schwarzspanierstrasse 17, A-1090, Wien, Austria</subfield>
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