Fibrillar center distribution in nucleoli of PHA-stimulated human lymphocytes.

Experimental Cell Research
R L Ochs, K Smetana

Abstract

We have utilized acidic toluidine blue staining for RNA and immunofluorescence staining for RNA polymerase 1 to visualize the distribution of fibrillar centers (FCs) in nucleoli of PHA-stimulated human lymphocytes. At 0 h, there is a single large fibrillar center in each nucleolus which splits into smaller and more numerous FCs until the number of FCs reaches five, the number of nucleolus organizers in normal haploid human cells. With time, each FC then "unwinds" to form linear arrays of smaller FCs until the maximum number of FCs approaches the ribosomal gene copy number of 200 at 48 h in culture. It is hypothesized that in the most active state, each nucleolar FC visualized by RNA polymerase 1 staining actually represents a single transcription unit and the distance between adjacent FCs is occupied by the nontranscribed spacer region. We conclude that the number of fibrillar centers per nucleolus can be used as a direct quantitative measure of nucleolar transcriptional activity.

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Citations

Apr 7, 2007·Bulletin of Experimental Biology and Medicine·N N VeikoD M Spitkovskii
Jan 1, 1990·Electron Microscopy Reviews·I RaskaL Salamin-Michel
Dec 1, 1993·Acta histochemica·K SmetanaR Ochs
Aug 9, 2002·Journal of Photochemistry and Photobiology. B, Biology·Karel SmetanaZbynek Hrkal
Mar 1, 1991·Experimental Cell Research·T HaafM Schmid
Jun 15, 1991·The Journal of Comparative Neurology·M LafargaE Maquiera
Jan 1, 1990·Virchows Archiv. B, Cell Pathology Including Molecular Pathology·T TakeuchiH Mori

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