Linked Life Data

11141089

Source:http://linkedlifedata.com/resource/pubmed/id/11141089

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2001-1-23
pubmed:abstractText
A novel nitroheterocyclic bis(haloethyl)phosphoramidate prodrug linked through lysine to a pteroic acid has been prepared and evaluated as a potential alkylating agent to target tumor cells that overexpress the folate receptor. The prodrug exhibited IC(50) values in the micromolar range and was 10-400-fold less cytotoxic in vitro than the phosphoramidate that lacks the lysine-pteroyl moiety. The data does not support a contribution of the folate receptor to cytotoxicity. In an attempt to determine the basis for the decreased cytotoxicity in the pteroyl-lysyl analogue, compounds were prepared in which the lysine-pteroyl moiety was replaced with lysine alone or with an n-propyl group. The n-propyl and the lysyl analogues were on average 3.8- and 21-fold less potent than the unsubstituted bis(haloethyl)phosphoramidate, respectively. Chemical reduction of the prodrugs followed by (31)P NMR kinetics demonstrated that all of the phosphoramidate anions cyclized to the aziridinium ion at similar rates and gave comparable product distributions, suggesting that changes in chemical activation did not account for the differences in cytotoxicity. It is likely that folate receptor-mediated transport is not sufficient to deliver adequate intracellular concentrations of the cytotoxic phosphoramide mustard.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0022-2623
pubmed:author
pubmed:issnType
Print
pubmed:day
4
pubmed:volume
44
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
69-73
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Synthesis and evaluation of pteroic acid-conjugated nitroheterocyclic phosphoramidates as folate receptor-targeted alkylating agents.
pubmed:affiliation
Department of Medicinal Chemistry and Molecular Pharmacology and the Cancer Center, Purdue University, West Lafayette, Indiana 47907, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.