Linked Life Data

7946965

Source:http://linkedlifedata.com/resource/pubmed/id/7946965

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1994-12-8
pubmed:abstractText
On the basis of the potencies of classical selective modulators of cyclic nucleotide phosphodiesterase (PDE) activities, five cyclic nucleotide PDE isoforms have been isolated and characterized in the cytosolic fraction of human term myometrium. By means of successive ion-exchange chromatographies, a calcium-calmodulin sensitive isoform, a cyclic GMP-stimulated isoform, a cyclic GMP-inhibited isoform, a rolipram-sensitive cyclic AMP-specific isoform and a cyclic GMP-specific isoform, corresponding to PDE I, PDE II, PDE III, PDE IV and PDE V, respectively, have been identified. We found that near term, human myometrium contains a higher proportion of the rolipram-sensitive type IV PDE isoform (about 50% of total cyclic AMP hydrolytic activity) than the type III cyclic GMP-inhibited PDE isoform (only 10%). Type IV PDE displays simple Michaelis-Menten kinetics with a high affinity for cyclic AMP (Km approximately 4.4 microM) and is selectively and competitively inhibited by rolipram (K(i) approximately 0.9 microM) and Ro 20-1724 (K(i) approximately 2.6 microM). The predominance of type IV PDE at the end of pregnancy suggests that this isoform contributes, via a modulation of the intracellular cyclic AMP level, to local control of uterine motility and thus could help the myometrium prepare for pronounced contractile activity at the time of parturition.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0898-6568
pubmed:author
pubmed:issnType
Print
pubmed:volume
6
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
405-12
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Isolation and characterization of the rolipram-sensitive cyclic AMP-specific phosphodiesterase (type IV PDE) in human term myometrium.
pubmed:affiliation
INSERM Unité 361, Maternité Baudelocque, Paris, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't