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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2006-10-23
pubmed:abstractText
Based on the topoisomerase IIalpha catalytic inhibitory activity of a previous hit compound, NSC35866, we screened 40 substituted purines or purine-like compounds from the National Cancer Institute repository for their ability to inhibit the ATPase activity of human topoisomerase IIalpha. Several compounds, including NSC348400, NSC348401 and NSC348402, were inhibitory at submicromolar concentrations. Three-dimensional quantitative structure-activity relationship models using comparative molecular field and comparative molecular similarity indices analyses were constructed using 24 of these compounds. The ability of 10 selected compounds to inhibit the complete DNA strand passage reaction of topoisomerase IIalpha correlated well with their potency as ATPase inhibitors. None of the 40 compounds significantly increased levels of the topoisomerase IIalpha-DNA covalent complex, suggesting that they functioned as catalytic topoisomerase II inhibitors and not as topoisomerase II poisons. Although some of these compounds could antagonize the effect of etoposide on the level of topoisomerase IIalpha-DNA covalent complex formation in vitro, in contrast to NSC35866, they were not capable of antagonizing etoposide-induced cytotoxicity and DNA strand breaks in cells. Two independently selected human SCLC cell lines with reduced topoisomerase IIalpha expression displayed cross-resistance to NSC348400, NBSC348401, and NSC348402, whereas an MDR1 line was fully sensitive. These results suggest that topoisomerase IIalpha is a functional cellular target for most of these substituted purine compounds and that these compounds do not display MDR1 liability.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/4,4'-(1,2-dimethyl-1,2-ethanediyl)bi..., http://linkedlifedata.com/resource/pubmed/chemical/Adenosine Triphosphatases, http://linkedlifedata.com/resource/pubmed/chemical/Antigens, Neoplasm, http://linkedlifedata.com/resource/pubmed/chemical/DNA, http://linkedlifedata.com/resource/pubmed/chemical/DNA Topoisomerases, Type II, http://linkedlifedata.com/resource/pubmed/chemical/DNA topoisomerase II alpha, http://linkedlifedata.com/resource/pubmed/chemical/DNA-Binding Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Enzyme Inhibitors, http://linkedlifedata.com/resource/pubmed/chemical/Etoposide, http://linkedlifedata.com/resource/pubmed/chemical/Mutant Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Piperazines, http://linkedlifedata.com/resource/pubmed/chemical/Purines, http://linkedlifedata.com/resource/pubmed/chemical/Razoxane, http://linkedlifedata.com/resource/pubmed/chemical/Topoisomerase II Inhibitors
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0026-895X
pubmed:author
pubmed:issnType
Print
pubmed:volume
70
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1503-13
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed-meshheading:16880287-Adenosine Triphosphatases, pubmed-meshheading:16880287-Antigens, Neoplasm, pubmed-meshheading:16880287-Catalysis, pubmed-meshheading:16880287-Cell Line, pubmed-meshheading:16880287-DNA, pubmed-meshheading:16880287-DNA Breaks, Double-Stranded, pubmed-meshheading:16880287-DNA Topoisomerases, Type II, pubmed-meshheading:16880287-DNA-Binding Proteins, pubmed-meshheading:16880287-Enzyme Inhibitors, pubmed-meshheading:16880287-Etoposide, pubmed-meshheading:16880287-HCT116 Cells, pubmed-meshheading:16880287-Humans, pubmed-meshheading:16880287-Hydrophobic and Hydrophilic Interactions, pubmed-meshheading:16880287-Inhibitory Concentration 50, pubmed-meshheading:16880287-Models, Molecular, pubmed-meshheading:16880287-Mutant Proteins, pubmed-meshheading:16880287-Piperazines, pubmed-meshheading:16880287-Purines, pubmed-meshheading:16880287-Quantitative Structure-Activity Relationship, pubmed-meshheading:16880287-Razoxane, pubmed-meshheading:16880287-Static Electricity, pubmed-meshheading:16880287-Topoisomerase II Inhibitors
pubmed:year
2006
pubmed:articleTitle
A three-dimensional quantitative structure-activity relationship study of the inhibition of the ATPase activity and the strand passing catalytic activity of topoisomerase IIalpha by substituted purine analogs.
pubmed:affiliation
TopoTarget A/S, Copenhagen, Denmark.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't