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Vol. 126, No. 3, 1986
Issue release date: 1986
Section title: Paper
Acta Anatomica 1986;126:141–146
(DOI:10.1159/000146203)

Relations between Nucleolar Morphometric Parameters and Pre-rRNA Synthesis in Animal and Plant Cells

Nin G.H.V · Echeverría O.M. · Zavala G. · Jiménez-García L.F.J. · Gonzalez M.A.G. · Parra R.
Laboratory of Electron Microscopy, Faculty of Sciences, UNAM, Mexico City, Mexico

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Article / Publication Details

First-Page Preview
Abstract of Paper

Received: 8/4/1985
Accepted: 9/15/1985
Published online: 7/15/2008

Number of Print Pages: 6
Number of Figures: 0
Number of Tables: 0

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: http://www.karger.com/CTO

Abstract

In order to study if there are differences between cells of the same tissue with one and two nucleoli, nuclear and nucleolar volume, density of tritiated uridine incorporation, amount of DNA per nucleus and intensity of cytoplasmic basophilia were measured in mononucleolated and binucleolated rat epithelial endometrial cells, in onion root meristematic cells and in chick embryo matrix cells of the central nervous system, neuroblasts and neurons. No significant differences in nuclear volume, density of tritiated uridine incorporation and amount of DNA per nucleus were found between cells of the same type with diverse numbers of nucleoli. Binucleolated endometrial cells, matrix cells, and root meristematic cells have biphasic distributions of nucleolar volumes. One peak of this distribution roughly coincides with the nucleolar volume of mononucleolated cells, the other peak corresponds almost to double the volume. As the density of uridine incorporation is the same irrespective of the nucleolar number and volume, the cells with larger nucleolar volumes have higher pre-rRNA synthesis. These cells also have higher amounts of ribosomes in the cytoplasm, as revealed by the photometric study of basophilia. It is concluded that in this population of cells the ribosomal production is regulated to a higher steady equilibrium than in the general population. This difference is not due to polyploidism or to the increased DNA content of G2 phase cells. Binucleolated neuroblasts and neurons have nucleolar volumes similar to those of mononucleolated ones.


  

Author Contacts

Dr. Gerardo H. Vázquez Nin, Laboratorio de Microscopía Electrónica, Facultad de Ciencias, UNAM, Apartado Postal 70438. Delegación Coyoacán 04510. México. DF (México)

  

Article Information

Received: August 4, 1985
Accepted: September 15, 1985
Published online: July 15, 2008
Number of Print Pages : 6

  

Publication Details

Cells Tissues Organs (in vivo, in vitro)

Vol. 126, No. 3, Year 1986 (Cover Date: 1986)

Journal Editor: Denker H.-W. (Essen), English A.W. (Atlanta, Ga.)
ISSN: 1422–6405 (Print), eISSN: 1422–6421 (Online)

For additional information: http://www.karger.com/CTO


Article / Publication Details

First-Page Preview
Abstract of Paper

Received: 8/4/1985
Accepted: 9/15/1985
Published online: 7/15/2008

Number of Print Pages: 6
Number of Figures: 0
Number of Tables: 0

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: http://www.karger.com/CTO


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