Back to Search
Start Over
Vasorelaxant effects of 1-nitro-2-phenylethene in rat isolated aortic rings.
- Source :
-
Vascular Pharmacology . Nov2014, Vol. 63 Issue 2, p55-62. 8p. - Publication Year :
- 2014
-
Abstract
- Previously, we showed that nitro-2-phenylethane is a vasorelaxant constituent of the essential oil of Aniba canelilla . Here, we investigated the mechanisms underlying the vascular effects of 1-nitro-2-phenylethene (NPe), a structural analog of 1-nitro-2-phenylethane obtained synthetically, in rat isolated thoracic aortic preparations. At 0.1–100 μg/mL, NPe similarly relaxed endothelium-intact or endothelium-denuded aortic preparations pre-contracted with 60 mM KCl or with phenylephrine (PHE, 1 μM). Vasorelaxant effects of NPe against PHE-induced contractions remained unaffected following blockade of potassium channels by TEA, and inhibition of either nitric oxide synthase by l -NAME, cyclooxygenase by indomethacin or guanylate cyclase by ODQ. In preparations maintained under Ca 2 + -free conditions, NPe significantly reduced the contractions induced (i) by PHE, but not those evoked by caffeine, (ii) by CaCl 2 in either PHE (in the presence of 1 μM verapamil)- or KCl-stimulated preparations, (iii) by extracellular Ca 2 + restoration in thapsigargin-treated aortic preparations, and (iv) by the activator of protein kinase C phorbol-12,13-dibutyrate or the inhibitor of protein tyrosine phosphatase sodium orthovanadate. It is concluded that NPe induced an endothelium-independent vasorelaxation with potency greater than its structural analog 1-nitro-2-phenylethane. Such action appears to occur intracellularly probably through inhibition of contractile events that are clearly independent of Ca 2+ influx from the extracellular milieu. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15371891
- Volume :
- 63
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Vascular Pharmacology
- Publication Type :
- Academic Journal
- Accession number :
- 99613245
- Full Text :
- https://doi.org/10.1016/j.vph.2014.08.002