Linked Life Data

20850539

Source:http://linkedlifedata.com/resource/pubmed/id/20850539

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2010-11-5
pubmed:abstractText
Sphingosine-1-phosphate (S1P) constricts cerebral arteries through S1P(3) receptor stimulation. Because the activity of the key S1P-synthesizing enzyme, sphingosine kinase (SPK), can be stimulated by agonists of various G protein-coupled receptors, it is likely that S1P also acts as a second messenger for other vasoconstrictors. We investigated the effect of SPK inhibitors and SPK gene deletion on the contractile responses of isolated vessels to vasoactive agonists and KCl-induced depolarization. Basilar and femoral arteries of rat, mounted in a wire myograph, were incubated with dimethylsphingosine (DMS), 2-(p-hydroxyanilino)-4-(p-chlorophenyl) thiazole (Compound 2) or FTY720, and exposed to KCl, 5-hydroxytryptamine (5-HT), S1P or phenylephrine (PE). Vasomotor responses in basilar artery were decreased by DMS, Compound 2 and FTY720, while they were not affected in femoral artery. Basilar arteries from SPK1(-/-) mice exhibited weaker vasoconstriction to both KCl and agonists (S1P and the prostanoid U46619) when compared to either wild type (WT) or SPK2(-/-). In contrast, in mesenteric resistance arteries, neither the contraction to KCl nor the maximum contraction to PE and S1P significantly differed among WT, SPK1(-/-) and SPK2(-/-). Quantitative analysis of SPK mRNA (reverse transcription and real time polymerase chain reaction) in mouse arteries showed 40-80-fold higher SPK1 expression in cerebral arteries than in aorta or mesenteric arteries. SPK1 critically modulates the reactivity of cerebral vasculature to vasoconstrictors. S1P plays a specific role as modulator of cerebral blood flow, potentially acting either directly outside vascular smooth muscle cells on S1P(3) receptors, or indirectly after being generated inside the cell in response to vasoconstrictors.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
1096-1186
pubmed:author
pubmed:copyrightInfo
Copyright © 2010 Elsevier Ltd. All rights reserved.
pubmed:issnType
Electronic
pubmed:volume
62
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
465-74
pubmed:dateRevised
2011-5-5
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Vessel-specific role of sphingosine kinase 1 in the vasoconstriction of isolated basilar arteries.
pubmed:affiliation
Stroke and Neurovascular Laboratory Regulation, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, USA.
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural