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Title: RNA polymerase activity in PtK1 micronuclei containing individual chromosomes: an in vitro and in situ study

Abstract

Micronuclei have been induced by colchicine in rat kangaroo (Potorous tridactylis) PtK1 cells. The synthesis of RNA was investigated both in isolated micronuclei by quantifying RNA polymerase activities at different ionic strengths with or without inhibitors, and in micronucleated cells by radioautography after (/sup 3/H)uridine pulse labeling. In vitro transcription shows that isolated micronuclei are able to take up (/sup 3/H)UTP. The rate curves of incorporation are close to those of isolated diploid nuclei, though the level of incorporation was relatively lower (65-70%) than control nuclei. This indicates that micronuclei react to the ionic environment and to inhibitors in the same manner as described for many species of isolated diploid nuclei. The labelling distributions plotted from radioautographs show that micronuclei were able to efficiently incorporate the hot precursor. Furthermore, for short pulses there is no homogeneity in the labelling density among the different micronuclei and there is no correlation between the labelling intensity and the size of micronuclei. After 60-min pulse time, there is an enhanced uptake of (/sup 3/H)uridine and all the micronuclei exhibit considerable labelling, although less than control cells. Thus, the micronuclei exhibit some characteristic RNA transcriptional activity in situ as well as after isolation. This materialmore » should be a particular interesting model with which to study the physiological activity and the role of each individual interphasic chromosome.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Institut Biomedical des Cordeliers, Paris, France
OSTI Identifier:
6526161
Resource Type:
Journal Article
Journal Name:
Exp. Cell Res.; (United States)
Additional Journal Information:
Journal Volume: 169:1
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; ANIMAL CELLS; AUTORADIOGRAPHY; CELL NUCLEI; ENZYME ACTIVITY; RNA POLYMERASES; BIOCHEMISTRY; COLCHICINE; IN VITRO; IN VIVO; TRITIUM COMPOUNDS; URIDINE; ALKALOIDS; ANTIMITOTIC DRUGS; ANTIPYRETICS; AZINES; CELL CONSTITUENTS; CENTRAL NERVOUS SYSTEM DEPRESSANTS; CHEMISTRY; DRUGS; ENZYMES; HETEROCYCLIC COMPOUNDS; HYDROXY COMPOUNDS; LABELLED COMPOUNDS; NUCLEOSIDES; NUCLEOTIDES; NUCLEOTIDYLTRANSFERASES; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PHOSPHORUS-GROUP TRANSFERASES; POLYMERASES; PYRIMIDINES; RIBOSIDES; TRANSFERASES; URACILS; 550201* - Biochemistry- Tracer Techniques

Citation Formats

Labidi, B, Gregoire, M, Frackowiak, S, Hernandez-Verdun, D, and Bouteille, M. RNA polymerase activity in PtK1 micronuclei containing individual chromosomes: an in vitro and in situ study. United States: N. p., 1987. Web. doi:10.1016/0014-4827(87)90241-2.
Labidi, B, Gregoire, M, Frackowiak, S, Hernandez-Verdun, D, & Bouteille, M. RNA polymerase activity in PtK1 micronuclei containing individual chromosomes: an in vitro and in situ study. United States. https://doi.org/10.1016/0014-4827(87)90241-2
Labidi, B, Gregoire, M, Frackowiak, S, Hernandez-Verdun, D, and Bouteille, M. 1987. "RNA polymerase activity in PtK1 micronuclei containing individual chromosomes: an in vitro and in situ study". United States. https://doi.org/10.1016/0014-4827(87)90241-2.
@article{osti_6526161,
title = {RNA polymerase activity in PtK1 micronuclei containing individual chromosomes: an in vitro and in situ study},
author = {Labidi, B and Gregoire, M and Frackowiak, S and Hernandez-Verdun, D and Bouteille, M},
abstractNote = {Micronuclei have been induced by colchicine in rat kangaroo (Potorous tridactylis) PtK1 cells. The synthesis of RNA was investigated both in isolated micronuclei by quantifying RNA polymerase activities at different ionic strengths with or without inhibitors, and in micronucleated cells by radioautography after (/sup 3/H)uridine pulse labeling. In vitro transcription shows that isolated micronuclei are able to take up (/sup 3/H)UTP. The rate curves of incorporation are close to those of isolated diploid nuclei, though the level of incorporation was relatively lower (65-70%) than control nuclei. This indicates that micronuclei react to the ionic environment and to inhibitors in the same manner as described for many species of isolated diploid nuclei. The labelling distributions plotted from radioautographs show that micronuclei were able to efficiently incorporate the hot precursor. Furthermore, for short pulses there is no homogeneity in the labelling density among the different micronuclei and there is no correlation between the labelling intensity and the size of micronuclei. After 60-min pulse time, there is an enhanced uptake of (/sup 3/H)uridine and all the micronuclei exhibit considerable labelling, although less than control cells. Thus, the micronuclei exhibit some characteristic RNA transcriptional activity in situ as well as after isolation. This material should be a particular interesting model with which to study the physiological activity and the role of each individual interphasic chromosome.},
doi = {10.1016/0014-4827(87)90241-2},
url = {https://www.osti.gov/biblio/6526161}, journal = {Exp. Cell Res.; (United States)},
number = ,
volume = 169:1,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 1987},
month = {Sun Mar 01 00:00:00 EST 1987}
}