Linked Life Data

7534807

Source:http://linkedlifedata.com/resource/pubmed/id/7534807

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1995-4-21
pubmed:abstractText
A number of cell types possess an L-arginine-nitric oxide (NO) pathway. We studied the presence of constitutive and inducible forms of NO synthase in human platelets. N omega-nitro-L-arginine, an inhibitor of NO synthase, potentiated thrombin-induced aggregation of washed human platelets, whereas L-arginine inhibited it. The direct evidence for the presence of constitutive form of NO synthase came from the observation of conversion of tritium-labeled L-arginine to tritium-labeled L-citrulline by washed platelets suspended in Ca(++)-rich but not in Ca(++)-free buffer. Incubation of washed platelets in Ca(++)-free buffer with cytokines (tumor necrosis factor-alpha and interferon-gamma) or cytokines plus lipopolysaccharide caused a marked increase in the conversion of [3H]L-arginine to [3H]L-citrulline, suggesting the presence of inducible form of NO synthase. Gel electrophoresis identified an approximately 130 kd protein band with NO synthase in the platelet cytosol, which on isolation converted [3H]L-arginine to [3H]L-citrulline. This 130 kd protein required the presence of Ca++, reduced nicotinamide adenine dinucleotide phosphate tetrahydro-L-biopterin, and flavin adenine dinucleotide for expression of NO synthase activity. Platelet sonicates demonstrated presence of nitrite, and its concentrations were lowered by preincubation of platelets with NG-nitro-L-arginine methyl ester and enhanced in cytokine-treated platelets. Reverse-transcription polymerase chain reaction demonstrated messenger RNA expression of the constitutive endothelial (but not brain) and inducible isoforms of NO synthase in platelets. These observations indicate that human platelet cytosol possesses both constitutive and inducible forms of NO synthase.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0022-2143
pubmed:author
pubmed:issnType
Print
pubmed:volume
125
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
370-7
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Identification of constitutive and inducible forms of nitric oxide synthase in human platelets.
pubmed:affiliation
Department of Medicine, University of Florida College of Medicine, Gainesville 32610-0277.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't