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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
10
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pubmed:dateCreated |
1991-6-21
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pubmed:abstractText |
Recent data suggest that nitrate compounds, beside determining vasodilatation by cGMP-mediated Ca++ uptake in the sarcoplasmic reticulum, may also inhibit vasoconstriction by reducing phosphatidyl inositol bisphosphate hydrolysis, a major step in the biochemical pathway responsible for vasoconstriction induced by a variety of agents including angiotensin II (AII). We assessed the inhibitory effects of Na-nitroprusside (NP) on the coronary resistances induced by increasing doses of AII in Krebs perfused (basal pressure: 2.5-3 KPa) Guinea-pig isolated hearts. AII bolus injections (5 to 100 ng) were given before and 10 min after a 7.6.10(-8) to 7.6.10(-6) M infusion of NP for 10 min. AII produced a highly reproducible, linearly dose-related, increase in perfusion pressure (PP) (5 ng: 4.4 +/- 1.16; 10 ng: 8.1 +/- 2.1; 25 ng: 18.7 +/- 3.06; 50 ng: 23.6 +/- 2.31; 100 ng: 30 +/- 1.37 mmHg) that was persistently and dose-dependently inhibited by NP. Well after (greater than 10 min) full recovery from the initial NP-induced vasodilatation and drop in PP its inhibitory effect was observed, varying from 22.1% at the maximal AII and minimal NP does and 90.6% at the minimal AII and maximal NP doses. This study demonstrates that, apart from causing the well-known immediate vasodilatory response by stimulation of cGMP synthesis, NP also causes delayed inhibition of AII-induced coronary vasoconstriction, possibly by preventing phosphatidyl inositol hydrolysis.
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pubmed:language |
ita
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:month |
Oct
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pubmed:issn |
0393-1978
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
35
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
809-14
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:1965534-Angiotensin II,
pubmed-meshheading:1965534-Animals,
pubmed-meshheading:1965534-Coronary Vessels,
pubmed-meshheading:1965534-Cyclic GMP,
pubmed-meshheading:1965534-Female,
pubmed-meshheading:1965534-Guinea Pigs,
pubmed-meshheading:1965534-Hydrolysis,
pubmed-meshheading:1965534-Male,
pubmed-meshheading:1965534-Nitroprusside,
pubmed-meshheading:1965534-Phosphatidylinositols,
pubmed-meshheading:1965534-Vasoconstriction
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pubmed:year |
1990
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pubmed:articleTitle |
[Sodium nitroprusside and inhibition of coronary vasoconstriction in isolated hearts of guinea pigs].
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pubmed:affiliation |
Divisione di Cardiologia, Istituto Scientifico H S Raffaele, Milano.
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pubmed:publicationType |
Journal Article,
In Vitro,
English Abstract
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