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Deciphering the human platelet sheddome.
- Source :
-
Blood [Blood] 2011 Jan 06; Vol. 117 (1), pp. e15-26. Date of Electronic Publication: 2010 Oct 20. - Publication Year :
- 2011
-
Abstract
- Activated platelets shed surface proteins, potentially modifying platelet function as well as providing a source of bioactive fragments. Previous studies have identified several constituents of the platelet sheddome, but the full extent of shedding is unknown. Here we have taken a global approach, analyzing protein fragments in the supernate of activated platelets using mass spectroscopy and looking for proteins originating from platelet membranes. After removing plasma proteins and microparticles, 1048 proteins were identified, including 69 membrane proteins. Nearly all of the membrane proteins had been detected previously, but only 10 had been shown to be shed in platelets. The remaining 59 are candidates subject to confirmation. Based on spectral counts, protein representation in the sheddome varies considerably. As proof of principle, we validated one of the less frequently detected proteins, semaphorin 7A, which had not previously been identified in platelets. Surface expression, cleavage, and shedding of semaphorin 7A were demonstrated, as was its association with α-granules. Finally, cleavage of semaphorin 7A and 12 other proteins was substantially reduced by an inhibitor of ADAM17, a known sheddase. These results define a subset of membrane proteins as sheddome candidates, forming the basis for further studies examining the impact of ectodomain shedding on platelet function.
- Subjects :
- ADAM17 Protein
Adult
Blotting, Western
Cytoplasmic Granules chemistry
Cytoplasmic Granules metabolism
Flow Cytometry
Humans
Quinolines pharmacology
Semaphorins metabolism
Tandem Mass Spectrometry
ADAM Proteins metabolism
Blood Platelets physiology
Membrane Proteins metabolism
Platelet Activation physiology
Semaphorins antagonists & inhibitors
Subjects
Details
- Language :
- English
- ISSN :
- 1528-0020
- Volume :
- 117
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Blood
- Publication Type :
- Academic Journal
- Accession number :
- 20962327
- Full Text :
- https://doi.org/10.1182/blood-2010-05-283838