Linked Life Data

9458348

Source:http://linkedlifedata.com/resource/pubmed/id/9458348

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2001-2-23
pubmed:abstractText
DNA topoisomerase II was monitored with the monoclonal antibody Ki-S1 in human fibroblasts after irradiation of cells with 254-nm UV light and -rays from a 137Cs source. DNA topoisomerase II was localized immunohistochemically as bright fluorescent dots in the karyoplasm. Investigated fibroblasts originated from normal human donors and a xeroderma pigmentosum patient (XP12BE). All cell lines showed a time and dose-dependent increase in DNA topoisomerase II abundance after irradiation. The increase may reflect enhanced accessibility of the enzyme, enhanced gene expression or enhanced stabilization of mRNA or protein molecules. The effect was detectable as early as 1 h after irradiation at doses 3 J/m2 or 3 Gy. It passed through a maximum and decreased within 18 h (UV light) or 6 h ( -rays). Except for the duration of the response, no principal differences were seen between the effects caused by UV light and those elicited by -rays. The increase in enzyme levels might be part of the well-known DNA damage responses which operate in cell-protective or DNA-reparative pathways or may reflect initiation of apoptosis. DNA topoisomerase I was detected with a commercially available polyclonal antibody raised against human DNA topoisomerase I. In unirradiated cells, DNA topoisomerase I was found to be mainly concentrated in nucleoli. Irradiation with -rays changed the staining pattern in that it caused a multitude of DNA topoisomerase I-rich centers to occur which may reflect sites of transcription of radiation-inducible genes.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1019-6439
pubmed:author
pubmed:issnType
Print
pubmed:volume
12
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
265-71
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Irradiation with ultraviolet light and gamma-rays increases the level of DNA topoisomerase II in nuclei of normal and xeroderma pigmentosum fibroblasts.
pubmed:affiliation
German Cancer Research Center, Division of Interaction of Carcinogens with Biological Macromolecules, Im Neuenheimer Feld 280, Heidelberg, D-69120, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't