Linked Life Data

7954422

Source:http://linkedlifedata.com/resource/pubmed/id/7954422

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
22
pubmed:dateCreated
1994-12-2
pubmed:abstractText
We examined several aspects of platinum-DNA adduct formation and repair in cisplatin-sensitive and -resistant human ovarian cancer cell lines. The formation of cisplatin-interstrand crosslinks (ICLs) was measured in five DNA sequences by renaturing agarose gel electrophoresis. There were considerable differences (up to 4-fold) in ICL levels in these DNA sequences following a 4-h incubation with cisplatin; however, the pattern of ICL formation did not depend on whether the region was transcriptionally active or gene encoding. Incubation of purified DNA with cisplatin yielded an ICL pattern with considerably less variability between the regions examined. Cisplatin ICL and total DNA platination levels were significantly higher (up to 20- and 40-fold, respectively) in cisplatin-resistant cell lines as compared to the parental, cisplatin-sensitive cell line at equivalent levels of cisplatin cytotoxicity. Under cisplatin exposure conditions which yielded similar initial levels of sequence-specific ICLs, the cisplatin-resistant cells removed up to 2.5 times more ICLs by 12-h posttreatment than the parental cell line. Increased removal of the individual platinum-deoxyribonucleosides of platinum-DNA adducts was also observed in the highly resistant C200 cell line as determined by high performance liquid chromatography separation and quantitation by atomic absorption spectrometry. These results indicate that DNA repair contributes significantly to cisplatin resistance and that increased DNA-damage tolerance may also be a component of the resistance phenotype in this model system.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0008-5472
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
54
pubmed:geneSymbol
DHFR
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
5911-6
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Relationship between platinum-DNA adduct formation and removal and cisplatin cytotoxicity in cisplatin-sensitive and -resistant human ovarian cancer cells.
pubmed:affiliation
Department of Medical Oncology, Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.