Platelet C1- inhibitor. A secreted alpha-granule protein.

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Platelet C1- inhibitor. A secreted alpha-granule protein.

In order to characterize which proteins of the contact phase of coagulation interact with platelets, human platelets were studied immunochemically and functionally to determine if they contain C1- inhibitor. By means of monospecific antibody to C1- inhibitor, a competitive enzyme-linked immunosorbent assay (CELISA) was developed to measure directly platelet C1- inhibitor. With the CELISA, from ...

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Expression of platelet C1 inhibitor.

Human platelets contain a pool of C1 inhibitor (C1 INH) distinct from that in plasma. Twelve normal platelet samples washed by centrifugation had a mean platelet C1 INH antigen level of 19.3 +/- 2.8 ng (mean +/- SEM) per 10(8) platelets. These values contrast with the mean +/- SEM platelet C1 INH antigen level of 6.1 +/- 0.9 per 10(8) platelets from 12 C1 INH-deficient patients. The level of pl...

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A platelet alpha-granule membrane protein (GMP-140) is expressed on the plasma membrane after activation

We have previously characterized a monoclonal antibody, S12, that binds only to activated platelets (McEver, R.P., and M.N. Martin, 1984, J. Biol. Chem., 259:9799-9804). It identifies a platelet membrane protein of Mr 140,000, which we have designated as GMP-140. Using immunocytochemical techniques we have now localized this protein in unstimulated and thrombin-stimulated platelets. Polyclonal ...

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The platelet-derived growth factor-inducible KC gene encodes a secretory protein related to platelet alpha-granule proteins.

A full length cDNA clone of the platelet-derived growth factor-inducible KC gene has been isolated, sequenced, and expressed in COS cells. Both sequence analysis and expression studies indicate that KC encodes a secretory protein. Sequence analysis shows that, furthermore, the protein encoded by KC belongs to a growing superfamily of inducible proteins with a common ancestral linkage to the pla...

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Chemotactic activity of platelet alpha granule proteins for fibroblasts

At sites of blood vessel injury, platelets release numerous substances that may have biological activities influencing cellular responses. In this study we examined separately the chemotactic activity for fibroblasts of three highly purified proteins obtained from platelet alpha granules: platelet factor 4 (PF4), platelet-derived growth factor (PDGF), and beta-thromboglobulin (BTG). We observed...

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ژورنال

عنوان ژورنال: Journal of Clinical Investigation

سال: 1985

ISSN: 0021-9738

DOI: 10.1172/jci111680