Linked Life Data

11672695

Source:http://linkedlifedata.com/resource/pubmed/id/11672695

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2001-10-23
pubmed:abstractText
The possible carcinogenicity of styrene is believed to be related to the DNA-binding properties of styrene 7,8-oxide (SO). In order to compare the intrinsic reactivity of the different nucleophilic sites in DNA towards SO and to evaluate the candidates for human biomonitoring we have determined the second-order rate constants and stabilities of several SO-adducts in double-stranded DNA. These include alpha- and beta-isomers of N7-substituted and alphaN(2)-substituted guanines, alpha- and betaN3-substituted and alphaN(6)-substituted adenines as well as betaN3- and alphaN(4)-substituted cytosines. The highest rate constants were found for the spontaneously depurinating N7-guanines being ca. 3-15-fold higher than those for the stable adducts. When the relative proportions of different alkylation products were determined in course of time, after a single addition of SO, the labile N7-guanines and N3-adenines were the major products at early time points. After 144 h of incubation at 37 degrees C, alphaN(6)-SO-adenine and alphaN(2)-SO-guanine as well as betaN3-SO-uracil were the major adducts. Regarding human biomonitoring, the N7-substituted guanines should be one of the main targets because of the high reactivity of the N7-atom of guanine. However, in the case of chronic styrene exposures the chemically more stable DNA adducts may become important.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0009-2797
pubmed:author
pubmed:issnType
Print
pubmed:day
28
pubmed:volume
138
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
111-24
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Kinetics of formation of specific styrene oxide adducts in double-stranded DNA.
pubmed:affiliation
Department of Biosciences at Novum, Karolinska Institute, S-141 57, Huddinge, Sweden. mikko.koskinen@orionpharma.com
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't