Linked Life Data

7250146

Source:http://linkedlifedata.com/resource/pubmed/id/7250146

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1981-9-22
pubmed:abstractText
Microsomal monoxygenases can oxidize the axial hydroxyl of the terminal digitoxosyl of digoxin (dg-3), digoxigenin bis-, and digoxigenin mono-digitoxoside (dg-2 and dg-1, respectively) to an oxo-group. The corresponding metabolites (15'-dehydro-dg-3, 9'-dehydro-dg-2, and 3'-dehydro-1, respectively) have been identified by chromatographic and chemical methods. Only after this oxibation the terminal sugar can be split off, presumably by beta-elimination. Therefore, for the degradation of dg-3 three successive cytochrome P450 catalyzed oxidations are necessary before digoxigenin (dg-0) can be obtained. The highest oxibation rate was observed with dg-1 (120-150 pmoles/mg microsomal protein/min) and by far the lowest with dg-2 (6-7 pmoles/min) as the substrate (concentration was 30/microM). The latter may contribute to the effect that dg-2 is the main dg-3 metabolite in vivo. Pretreatment of rats with canrenoate enhanced the microsomal oxidation of dg-3, dg-2, and dg-1 by a factor of 3.2, 2.3 and 1.3, respectively. In contrast, there was no increase after pretreatment with phenobarbital.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0378-7966
pubmed:author
pubmed:issnType
Print
pubmed:volume
5
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
225-32
pubmed:dateRevised
2011-2-2
pubmed:meshHeading
pubmed:year
1980
pubmed:articleTitle
Cleavage of digoxigenin digitoxosides by rat liver microsomes.
pubmed:publicationType
Journal Article