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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
3
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pubmed:dateCreated |
1992-4-7
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pubmed:abstractText |
Activated human polymorphonuclear neutrophils (PMNs) induce platelet stimulation via cathepsin G (cat G), a platelet-activating cationic serine proteinase released from the azurophilic granules. Heparin inhibited up to 100% of aggregation and serotonin release triggered by 180 nmol/L of purified cat G in a concentration-dependent manner between 10 and 70 mU/ml. When tested against the enzymatic activity of 180 nmol/L cat G (hydrolysis of N-succinyl-Ala-Ala-Pro-Phe-p-nitroanilide), inhibition by heparin never exceeded 60% (up to 100 U/ml). Inhibition was most probably related to electrostatic interactions between the cationic cat G and the anionic heparin, because addition of 180 mU/ml of protamine sulfate restored platelet activation. Low molecular weight heparin, CY 216, used between 5 and 50 mU/ml, also inhibited cat G-induced platelet activation. When purified PMNs and washed platelets were mixed together and challenged with a PMN agonist (FMLP at 1 mumol/L), platelet activation was observed. Pretreatment of the mixed cell population with 300 mU/ml heparin prevented platelet activation. This was illustrated by electron microscopy studies. The present data, apart from confirming a participation of cat G in the PMN-platelet interaction, bring evidence that heparin has potent antiproteinase effect in a biologic model.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
AIM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/CTSG protein, human,
http://linkedlifedata.com/resource/pubmed/chemical/Cathepsin G,
http://linkedlifedata.com/resource/pubmed/chemical/Cathepsins,
http://linkedlifedata.com/resource/pubmed/chemical/Heparin,
http://linkedlifedata.com/resource/pubmed/chemical/N-Formylmethionine...,
http://linkedlifedata.com/resource/pubmed/chemical/Serine Endopeptidases
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pubmed:status |
MEDLINE
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pubmed:month |
Mar
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pubmed:issn |
0022-2143
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
119
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
231-9
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pubmed:dateRevised |
2009-11-19
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pubmed:meshHeading |
pubmed-meshheading:1541873-Blood Platelets,
pubmed-meshheading:1541873-Cathepsin G,
pubmed-meshheading:1541873-Cathepsins,
pubmed-meshheading:1541873-Dose-Response Relationship, Drug,
pubmed-meshheading:1541873-Drug Interactions,
pubmed-meshheading:1541873-Heparin,
pubmed-meshheading:1541873-Humans,
pubmed-meshheading:1541873-Microscopy, Electron,
pubmed-meshheading:1541873-N-Formylmethionine Leucyl-Phenylalanine,
pubmed-meshheading:1541873-Neutrophils,
pubmed-meshheading:1541873-Platelet Activation,
pubmed-meshheading:1541873-Serine Endopeptidases
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pubmed:year |
1992
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pubmed:articleTitle |
Heparin inhibits neutrophil-induced platelet activation via cathepsin G.
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pubmed:affiliation |
Unité de Pharmacologie Cellulaire, Institut Pasteur, Paris, France.
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pubmed:publicationType |
Journal Article
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