Linked Life Data

7194140

Source:http://linkedlifedata.com/resource/pubmed/id/7194140

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1981-6-25
pubmed:abstractText
A method for the selective killing of methotrexate (MTX)-resistant cells has been developed. The selection is based on the incorporation of tritiated deoxyuridine into the DNA of MTX-resistant cells but not normal MTX-sensitive cells in the presence of the drug. A Chinese hamster ovary cell mutant that overproduces dihydrofolate reductase was used as an example of a MTX-resistant cell line. In this system, a 10,000-fold enrichment for wild-type MTX-sensitive cells could be achieved after 24 hr of exposure to the drug combination. This selection technique was applied to the isolation of MTX-sensitive segregants from hybrid cells formed between the MTX-resistant mutant and wild-type cells. The loss of MTX resistance and dihydrofolate reductase overproduction was always accompanied by the loss of a homogeneously staining region on chromosome 2 of the resistant parent that contains the amplified genes specifying this enzyme. While this region is always lost, other parts of chromosome 2 are almost always retained, suggesting that deletion rather than chromosome loss underlies marker segregation in this case. When the selection was applied to the resistant mutant itself, no MTX-sensitive revertants were obtained among 10(5) cells screened, attesting to the stability of gene amplification in this clone. It is suggested that this combination of drugs may be useful for the elimination of MTX-resistant tumor cells that develop after MTX chemotherapy.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0008-5472
pubmed:author
pubmed:issnType
Print
pubmed:volume
41
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1594-601
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1981
pubmed:articleTitle
Selective killing of methotrexate-resistant cells carrying amplified dihydrofolate reductase genes.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.