| Expression of prostaglandin H2-mediated mechanism of vascular contraction in hypertensive rats. Relation to lipoxygenase and prostacyclin synthase activities. | |
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MedLine Citation:
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PMID: 8293559 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We tested the hypothesis that a prostanoid-mediated mechanism of vascular contraction is expressed in rats with aortic coarctation-induced hypertension. Rings of descending thoracic aorta taken from normotensive and hypertensive rats were contrasted in terms of constrictor responsiveness to arachidonic acid (AA), AA-induced release of eicosanoids, and ability to convert exogenous prostaglandin (PG) H2 to PGI2. AA (10(-8) to 10(-5) mol/L) increased isometric tension in aortic rings (bathed in Krebs' bicarbonate buffer) of hypertensive but not normotensive rats. AA (10(-5) mol/L) also elicited the release of PGI2, PGE2, thromboxane (TX) A2, and monohydroxyeicosatetraenoic acids (HETEs); this release from the aortic rings of hypertensive rats exceeded the corresponding release from the aortic rings of normotensive rats. However, the rate of conversion of exogenous PGH2 to PGI2 by aortic rings of hypertensive rats was < 50% the rate of conversion by aortic rings of normotensive rats. The constrictor effect of AA in aortic rings of hypertensive rats was abolished by an inhibitor of cyclooxygenase (indomethacin, 10 mumol/L) and a blocker of TXA2-PGH2 receptors (SQ29548, 1 mumol/L) but was not affected by an inhibitor of TXA2 synthesis (CGS13080, 10 mumol/L), suggesting mediation by PGH2. The lipoxygenase inhibitor baicalein (75 mumol/L) also attenuated the constrictor effect of AA in aortic rings of hypertensive rats while decreasing the associated release of HETEs and correcting the impairment in the conversion of PGH2 to PGI2.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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L Lin; M Balazy; P J Pagano; A Nasjletti |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Circulation research Volume: 74 ISSN: 0009-7330 ISO Abbreviation: Circ. Res. Publication Date: 1994 Feb |
Date Detail:
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Created Date: 1994-02-28 Completed Date: 1994-02-28 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0047103 Medline TA: Circ Res Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 197-205 Citation Subset: IM |
Affiliation:
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Department of Pharmacology, New York Medical College, Valhalla 10595. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Aortic Coarctation / complications Arachidonic Acid / pharmacology Cyclooxygenase Inhibitors / pharmacology Cytochrome P-450 Enzyme System / metabolism* Hypertension / enzymology*, etiology, physiopathology* Intramolecular Oxidoreductases* Isomerases / metabolism* Isometric Contraction / drug effects Lipoxygenase / metabolism* Lipoxygenase Inhibitors / pharmacology Male Prostaglandin H2 Prostaglandins H / physiology* Rats Rats, Sprague-Dawley Receptors, Prostaglandin / antagonists & inhibitors Receptors, Thromboxane / antagonists & inhibitors Receptors, Thromboxane A2, Prostaglandin H2 Thromboxane-A Synthase / antagonists & inhibitors Vasoconstriction / drug effects, physiology* |
| Grant Support | |
ID/Acronym/Agency:
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5PO1 HL-34300/HL/NHLBI NIH HHS; HL-18579/HL/NHLBI NIH HHS; HL-36670/HL/NHLBI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Cyclooxygenase Inhibitors; 0/Lipoxygenase Inhibitors; 0/Prostaglandins H; 0/Receptors, Prostaglandin; 0/Receptors, Thromboxane; 0/Receptors, Thromboxane A2, Prostaglandin H2; 42935-17-1/Prostaglandin H2; 506-32-1/Arachidonic Acid; 9035-51-2/Cytochrome P-450 Enzyme System; EC 1.13.11.12/Lipoxygenase; EC 5.-/Isomerases; EC 5.3.-/Intramolecular Oxidoreductases; EC 5.3.99.4/prostacyclin synthetase; EC 5.3.99.5/Thromboxane-A Synthase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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