Linked Life Data

1667913

Source:http://linkedlifedata.com/resource/pubmed/id/1667913

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1992-7-15
pubmed:abstractText
The possible mechanism underlying the vasorelaxant effect of emodin isolated from a Chinese herb, was investigated in this study. Emodin dose dependently relaxed isolated vascular rings of human internal mammary artery and saphenous vein, rabbit thoracic aorta, abdominal aorta and mesenteric artery, and rat thoracic aorta. There were no differences in the sensitivity (IC50) and maximal relaxation between intact and endothelium-denuded preparations of rat aorta. In the presence of emodin (10 microM), the contractile responses of rat aorta to phenylephrine, serotonin and potassium chloride were depressed. The relaxation response to acetylcholine was attenuated by emodin, whereas that to isoproterenol was unaffected. The relaxation response to emodin was inhibited by free radical scavengers, superoxide dismutase, catalase and mannitol, and guanylate cyclase inhibitors, methylene blue and hemoglobin. Catalase was the most effective scavenger. Quinacrine (phospholipase A2 inhibitor), indomethacin (cyclooxygenase inhibitor) and nordihydroguaiaretic acid (NDGA, lipoxygenase inhibitor) potentiated the relaxation induced by emodin. NDGA was the most effective potentiator. Exposure of aortic rings to emodin (10 microM) increased the basal level of guanosine 3',5'-cyclic monophosphate (cGMP). It is suggested that the vasorelaxant effect of emodin may be mainly due to cGMP accumulation as a result of guanylate cyclase activation by free radicals and/or hydrogen peroxide generated from semiquinone.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0014-2999
pubmed:author
pubmed:issnType
Print
pubmed:day
3
pubmed:volume
205
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
289-94
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
Vasorelaxant effect of emodin, an anthraquinone from a Chinese herb.
pubmed:affiliation
Department of Pharmacology, College of Medicine, National Taiwan University, Taipei, R.O.C.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't