Development of nucleolar apparatus in the chick primitive erythroid cells
Language English Country Germany Media print
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
7526745
DOI
10.1007/bf00186827
Knihovny.cz E-resources
- MeSH
- Cell Differentiation physiology MeSH
- Cell Nucleolus metabolism ultrastructure MeSH
- Cell Line MeSH
- Erythroid Precursor Cells cytology metabolism ultrastructure MeSH
- Erythropoiesis physiology MeSH
- Chick Embryo MeSH
- RNA metabolism MeSH
- Animals MeSH
- Check Tag
- Chick Embryo MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- RNA MeSH
The primitive erythroid line cells of chick embryos were studied during embryonic days 2-14 by means of a cytochemical method to investigate the appearance and frequency of the main nucleolar types. The populations of erythroblasts and erythrocytes were classified according to the presence of functionally dominant nucleoli in their nuclei. In the course of primitive erythroid cell differentiation and maturation, compact nucleoli and nucleoli with nucleolonemas (both supposed to be RNA biosynthetically active) were gradually replaced by ring-shaped nucleoli and finally by micronucleoli reflecting the reversible and irreversible inhibition of RNA synthesis, respectively. The occurrence of the main nucleolar types and their values in primitive erythroid cells of the developing chick depend not only on the maturation stage of the blood cells, but also on the developmental stage of the chick embryo. In comparison with the definitive erythroid line of the post-hatching chick and hen, the cells of the chick embryonic primitive erythroid line possess relatively high values of "active" nucleolar types. These are still present in advanced maturation stages, and occur also as definitive erythroid lines of lower vertebrates.
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