Linked Life Data

7851341

Source:http://linkedlifedata.com/resource/pubmed/id/7851341

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1995-3-15
pubmed:abstractText
The mechanisms by which two quinone-forming compounds, hydroquinone (HQ) and tert-butyl-hydroquinone (tBHQ), induce chromosomal loss and breakage in a prostaglandin H synthase-containing V79 cell line have been investigated using the cytokinesis-block micronucleus assay with CREST antibody staining. Increased frequencies of CREST-positive micronuclei (indicating chromosome loss) and CREST-negative micronuclei (indicating chromosome breakage) were observed following exposure of cells to HQ and tBHQ. The formation of micronuclei by HQ, but not tBHQ, was dependent on arachidonic acid supplementation, indicating activation by prostaglandin H synthase. Since the oxidation of hydroquinones can result in the generation of oxygen radicals, the contribution of oxygen radicals to the formation of chromosomal alterations induced by HQ and tBHQ was investigated. In the presence of a superoxide-generating system consisting of hypoxanthine and xanthine oxidase, a significant increase in micronucleated cells was observed. These induced micronuclei consisted exclusively of CREST-negative micronuclei and their formation was completely inhibited by pretreatment with catalase. Catalase also significantly inhibited the CREST-negative micronuclei induced by HQ and tBHQ. In addition, glutathione treatment inhibited both CREST-positive and negative micronuclei induced by these phenolic compounds. These results indicate that both chromosome loss and breakage are induced by these two quinone-forming agents. Reactive oxygen species contribute to the chromosomal breakage induced by HQ and tBHQ but the observed chromosomal loss appears to result from other mechanisms such as an interference of quinone metabolites with spindle formation.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0893-6692
pubmed:author
pubmed:issnType
Print
pubmed:volume
24
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
293-300
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Role of oxygen radicals in the chromosomal loss and breakage induced by the quinone-forming compounds, hydroquinone and tert-butylhydroquinone.
pubmed:affiliation
Department of Entomology, University of California, Riverside 92521.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't