Linked Life Data

9641550

Source:http://linkedlifedata.com/resource/pubmed/id/9641550

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1998-10-29
pubmed:abstractText
1. The aim of this study was to determine the response of porcine small pulmonary arteries to intralumenal flow and to identify the cellular mechanisms and potential mediators involved in the response. 2. Porcine small pulmonary arteries were isolated from a branch of the main intrapulmonary artery of the lower lung lobe and studied in a perfusion myograph system that allowed independent control of transmural pressure and intralumenal flow. At a transmural pressure of 20 mmHg, the baseline internal diameter (BID) of the arteries was 251.2+/-16.1 microm (n=16). 3. Under quiescent conditions or during constriction with U46619 to approximately 60% of BID, intralumenal flow caused reversible constriction in arteries with endothelium (in the presence of U46619, flow decreased diameter from 60.0+/-2.5% to 49.5+/-3.0% BID at 10 microl min(-1), n=16, P<0.05) but no change in diameter of arteries without endothelium. 4. In the presence of superoxide dismutase (SOD, 150 u ml(-1)), the response to flow was converted from constriction to vasodilatation (in presence of U46619 and SOD, flow increased diameter from 54.2+/-3.4% to 76.7+/-4.5% BID at 10 microl min(-1), n=10, P<0.05). Inhibition of NO synthase with L-NAME (3 x 10(-5) M) abolished the flow-induced vasodilatation occurring in the presence of SOD and the flow-induced constriction occurring in the absence of SOD. In arteries with endothelium, L-NAME (3 x 10(-5) M) caused significant vasoconstriction, whereas SOD did not alter vasomotor tone. 5. Acetylcholine (10(-8) to 10(-6) M) caused endothelium-dependent relaxation of small pulmonary arteries that was not significantly affected by SOD (150 u ml(-1)) but was inhibited by L-NAME (3 x 10(-5) M). 6. These results suggest that in small, porcine, isolated pulmonary arteries, intralumenal flow increases the production of NO but this is obscured by the generation of superoxide which causes vasoconstriction.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0007-1188
pubmed:author
pubmed:issnType
Print
pubmed:volume
124
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
331-6
pubmed:dateRevised
2008-11-20
pubmed:meshHeading
pubmed-meshheading:9641550-15-Hydroxy-11 alpha,9..., pubmed-meshheading:9641550-Acetylcholine, pubmed-meshheading:9641550-Animals, pubmed-meshheading:9641550-Aorta, Thoracic, pubmed-meshheading:9641550-Dose-Response Relationship, Drug, pubmed-meshheading:9641550-Endothelium, Vascular, pubmed-meshheading:9641550-Enzyme Inhibitors, pubmed-meshheading:9641550-Male, pubmed-meshheading:9641550-Muscle, Smooth, Vascular, pubmed-meshheading:9641550-NG-Nitroarginine Methyl Ester, pubmed-meshheading:9641550-Nitric Oxide, pubmed-meshheading:9641550-Nitric Oxide Synthase, pubmed-meshheading:9641550-Pulmonary Artery, pubmed-meshheading:9641550-Pulmonary Circulation, pubmed-meshheading:9641550-Superoxide Dismutase, pubmed-meshheading:9641550-Swine, pubmed-meshheading:9641550-Vasoconstriction, pubmed-meshheading:9641550-Vasoconstrictor Agents
pubmed:year
1998
pubmed:articleTitle
Superoxide and endothelium-dependent constriction to flow in porcine small pulmonary arteries.
pubmed:affiliation
Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
pubmed:publicationType
Journal Article