preparations of platelet concentrates (pcs) that are stored under blood bank conditions and used for transfusion purposes, appear to be enriched in platelet derived-microparticles (pmps) with high coagulant activity that may change platelet efficacy and safety issues. high shear stress could cause shedding of pmps from the platelet plasma membrane, platelet aggregation, and activation of the co...

Platelets promote angiogenesis by releasing angiogenesis-regulating factors from their α-granules upon aggregation. This effect has both physiologic and pathologic significance as it may contribute to carcinogenesis. Platelet α-granule release and aggregation are regulated, in part, via protein kinase C (PKC) α and β signaling. Our study investigated the effects of PKC inhibition on aggregation...

Platelets promote angiogenesis by releasing angiogenesisregulating factors from their a-granules upon aggregation. This effect has both physiologic and pathologic significance as it may contribute to carcinogenesis. Platelet a-granule release and aggregation are regulated, in part, via protein kinase C (PKC) a and b signaling. Our study investigated the effects of PKC inhibition on aggregation,...

Specific monoclonal and polyclonal antibody reagents and a double antigen indirect immunofluorescence microscopy technique were used to visualize coagulation factor V in human bone marrow. Marrow aspirates were smeared directly on glass slides, or washed and cytospun onto glass slides, or processed and plated into a plasma/methylcellulose cell culture system. Morphologically identifiable coloni...

Abnormal proliferation of the megakaryocytic line was observed in the marrow tissue from patients with myeloproliferative disorders. Megakaryocytes were identified by immunofluorescence using distinct platelet protein markers. Plasma factor VIII antigen (factor VIII:AGN) and platelet glycoproteins IIb and IIIa were detected in normal mature and early megakaryocytes, as well as in a morphologica...

OBJECTIVE Thiol isomerases facilitate protein folding in the endoplasmic reticulum, and several of these enzymes, including protein disulfide isomerase and ERp57, are mobilized to the surface of activated platelets, where they influence platelet aggregation, blood coagulation, and thrombus formation. In this study, we examined the synthesis and trafficking of thiol isomerases in megakaryocytes,...

Background: The changes of platelet parameters can be a useful index for rapid diagnosis of urinary tract infection (UTI), since platelet changes are routinely determined through complete blood count (CBC) test. The correlation between platelet indices, included number (PLTs), mean platelet volume (MPV) and platelet distribution width (PDW), which are the indicators of production and function o...

Platelets promote angiogenesis by releasing angiogenesisregulating factors from their a-granules upon aggregation. This effect has both physiologic and pathologic significance as it may contribute to carcinogenesis. Platelet a-granule release and aggregation are regulated, in part, via protein kinase C (PKC) a and b signaling. Our study investigated the effects of PKC inhibition on aggregation,...

Platelet-associated C3 (PA-C3) was measured with a quantitative immunofluorescence assay. With this assay, PA-C3 levels were determined for 78 normal volunteers, 30 patients with immune thrombocytopenic purpura (ITP), and 20 patients with nonimmune thrombocytopenias. Platelet-associated IgG (PA-IgG) levels were also measured with our standard quantitative immunofluorescence assay. All patients ...