Linked Life Data

8780196

Source:http://linkedlifedata.com/resource/pubmed/id/8780196

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3 Pt 2
pubmed:dateCreated
1996-10-30
pubmed:abstractText
To elucidate the effects of chronic hypoxia on alpha 1-adrenergic receptor-mediated contractions of the uterine artery, we examined norepinephrine-induced contractions in tissues obtained from near-term (approximately 140 days gestation) pregnant ewes maintained near sea level (approximately 300 m) and at high altitude (3,820 m) from 30 days gestation. Compared with the sea-level controls, contractions induced by norepinephrine in main and fourth-branch uterine arteries of the high-altitude animals were significantly depressed. The norepinephrine dose-response curves were shifted to the right and the concentrations at which 50% of the maximal response was attained were increased 3.2- and 5.7-fold in the main and fourth-branch uterine arteries, respectively. The maximal responses were decreased 22 and 36% in main and fourth-branch uterine arteries, respectively. The dissociation constants of norepinephrine were increased from 0.77 to 1.53 microM and from 0.72 to 2.05 microM in main and fourth-branch uterine arteries, respectively. Radioligand binding studies with [3H]prazosin revealed a decrease in the density of alpha 1-adrenergic receptors in both vessels from high-altitude animals. We conclude that chronic hypoxia depresses alpha 1-adrenergic receptor-induced contractions of conduit- and resistance-type uterine arteries. The depressed contractility is mediated, at least in part, by decreases in alpha 1-adrenergic receptor density and agonist binding affinity.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0002-9513
pubmed:author
pubmed:issnType
Print
pubmed:volume
270
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
H1001-7
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
Effects of long-term high-altitude hypoxemia on alpha 1-adrenergic receptors in the ovine uterine artery.
pubmed:affiliation
Department of Pharmacology, Loma Linda University School of Medicine, California 92350, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't