Linked Life Data

6259101

Source:http://linkedlifedata.com/resource/pubmed/id/6259101

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1981-5-21
pubmed:abstractText
Exposure to chronic hypoxia results in a lower resting heart rate and a blunted cardiovascular responsiveness to beta-adrenergic receptor stimulation. Possible effects of acclimatization to high altitude on the binding of [125I]iodohydroxybenzylpindolol to beta-adrenergic receptors on membranes of right and left ventricles of rat heart were determined. Chronic high-altitude exposure led to a decrease in the density of beta-adrenergic receptors in nonhypertrophied left ventricles as well as in hypertrophied right ventricles. The affinity of the receptor for the radioligand was not changed by the exposure to high altitude, suggesting that the properties of the receptor were not affected. Basal and isoproterenol-stimulated adenylate cyclase activities were decreased in membranes prepared from hearts and pulmonary arteries of rats acclimatized to high altitude. The loss of cardiac beta-adrenergic receptors in rats adapted to high altitude was prevented by the chronic coadministration of a low dose of DL-propranolol. The results suggest that changes in beta-adrenergic receptor density may partially explain the hemodynamic adaptation that occurs with chronic hypoxia. These decreases may be due to a loss of functional beta-adrenergic receptors caused by chronically elevated concentrations of circulating neurally released catecholamines.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0161-7567
pubmed:author
pubmed:issnType
Print
pubmed:volume
50
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
363-6
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1981
pubmed:articleTitle
Effects of hypoxia on density of beta-adrenergic receptors.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't