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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
1
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pubmed:dateCreated |
1990-11-21
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pubmed:abstractText |
Effects of norepinephrine (NE), carbachol (CCh) and histamine (HIS) on vascular tone and the endothelial and smooth muscle cytosolic C++ levels ([Ca++]i) were examined in rat aorta. The fura-2-Ca++ fluorescence emitted from endothelial and smooth muscle cells was detected at the endothelial surface. In the aorta with endothelium, NE increased both [Ca++]i and muscle tension whereas CCh slightly relaxed the muscle and increased [Ca++]i. The CCh-stimulated [Ca++]i was partially inhibited by verapamil. Addition of CCh to the NE-stimulated aorta relaxed the muscle with additional increase in [Ca++]i and positive correlation was obtained between the increase in [Ca++]i and relaxation. In the aorta without endothelium, NE increased both [Ca++]i and tension although CCh was ineffective. When endothelium was removed only from a small area from where the fura-2-Ca++ fluorescence was detected, CCh relaxed the muscle without changing [Ca++]i. In this preparation, NE increased both [Ca++]i and muscle tension and sequential addition of CCh relaxed the muscle with a small decrease in [Ca++]i, suggesting that Ca++ sensitivity of contractile elements is decreased. In Ca+(+)-free solution, CCh induced a transient increase in [Ca++]i and a decrease in muscle tension only in the presence of endothelium. HIS showed similar effects as CCh. By contrast, sodium nitroprusside decreased [Ca++]i and relaxed the muscle in NE-stimulated aorta with or without endothelium. These results suggest that CCh and HIS increase [Ca++]i in the endothelial cells which regulates the synthesis and/or release of endothelium-derived relaxing factor. Endothelium-derived relaxing factor may decrease [Ca++]i in the smooth muscle cells and also decrease Ca++ sensitivity of contractile elements resulting in vasodilatation.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Calcium,
http://linkedlifedata.com/resource/pubmed/chemical/Carbachol,
http://linkedlifedata.com/resource/pubmed/chemical/Histamine,
http://linkedlifedata.com/resource/pubmed/chemical/Nitric Oxide,
http://linkedlifedata.com/resource/pubmed/chemical/Norepinephrine
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pubmed:status |
MEDLINE
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pubmed:month |
Oct
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pubmed:issn |
0022-3565
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
255
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
114-9
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:2213546-Animals,
pubmed-meshheading:2213546-Aorta,
pubmed-meshheading:2213546-Calcium,
pubmed-meshheading:2213546-Carbachol,
pubmed-meshheading:2213546-Cytosol,
pubmed-meshheading:2213546-Endothelium, Vascular,
pubmed-meshheading:2213546-Histamine,
pubmed-meshheading:2213546-Male,
pubmed-meshheading:2213546-Muscle, Smooth, Vascular,
pubmed-meshheading:2213546-Nitric Oxide,
pubmed-meshheading:2213546-Norepinephrine,
pubmed-meshheading:2213546-Rats,
pubmed-meshheading:2213546-Rats, Inbred Strains,
pubmed-meshheading:2213546-Vasoconstriction
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pubmed:year |
1990
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pubmed:articleTitle |
Differential effects of carbachol on cytosolic calcium levels in vascular endothelium and smooth muscle.
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pubmed:affiliation |
Department of Veterinary Pharmacology, Faculty of Agriculture, University of Tokyo, Japan.
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pubmed:publicationType |
Journal Article,
In Vitro,
Research Support, Non-U.S. Gov't
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