PF4 (platelet factor 4)
نویسندگان
چکیده
منابع مشابه
Antigenic and antiheparin properties of human platelet factor 4 (PF4).
Platelet factor 4 (PF4, a heparin-neutralizing protein) was isolated from washed human platelets. It was found to be homogenous by SDS-polyacrylamide gel electrophoresis, immunodiffusion, and immunoelectrophoresis, when tested with monospecific antibody produced in rabbits. PF4 is a heat-stable protein, but its antiheparin activity and antigenicity are destroyed by trypsin. The molecular weight...
متن کاملPolyphosphates form antigenic complexes with platelet factor 4 (PF4) and enhance PF4-binding to bacteria.
Short chain polyphosphates (polyP) are pro-coagulant and pro-inflammatory platelet released inorganic polymers. The platelet chemokine platelet factor 4 (PF4) binds to lipid A on bacteria, inducing an antibody mediated host defense mechanism, which can be misdirected against PF4/heparin complexes leading to the adverse drug reaction heparin-induced thrombocytopenia (HIT). Here, we demonstrate t...
متن کاملInhibition of human megakaryocytopoiesis in vitro by platelet factor 4 (PF4) and a synthetic COOH-terminal PF4 peptide.
We report that highly purified human platelet factor 4 (PF4) inhibits human megakaryocytopoiesis in vitro. At greater than or equal to 25 micrograms/ml, PF4 inhibited megakaryocyte colony formation approximately 80% in unstimulated cultures, and approximately 58% in cultures containing recombinant human IL 3 and granulocyte-macrophage colony-stimulating factor. Because PF4 (25 micrograms/ml) ha...
متن کاملRaised plasma concentrations of platelet factor 4 (PF4) in Crohn's disease.
Plasma platelet factor 4 (PF4), secreted by the platelets, is an index of platelet aggregation and thromboembolic risk. The authors assessed PF4 in 20 patients with Crohn's disease (ileitis in 13 patients, ileocolitis in seven) and in 20 healthy volunteers. Disease activity was low (Crohn's Disease Activity Index less than 150) in 11 patients and high in nine. Radioimmunoassay of PF4 using Abbo...
متن کاملPlatelet factor 4 binding to lipid A of Gram-negative bacteria exposes PF4/heparin-like epitopes.
The positively charged chemokine platelet factor 4 (PF4) forms immunogenic complexes with heparin and other polyanions. Resulting antibodies can induce the adverse drug effect heparin-induced thrombocytopenia. PF4 also binds to bacteria, thereby exposing the same neoantigen(s) as with heparin. In this study, we identified the negatively charged lipopolysaccharide (LPS) as the PF4 binding struct...
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ژورنال
عنوان ژورنال: Atlas of Genetics and Cytogenetics in Oncology and Haematology
سال: 2014
ISSN: 1768-3262
DOI: 10.4267/2042/54016