In comparison to progenitor platelets, microparticles are deficient in GpIb, GpIb-derived carbohydrates, glycerophospholipids, glycosphingolipids, and ceramides

• Autorzy: Zdebska E. , Wozniak J. , Dzieciatkowska A. , Koscielak J.
• Języki publikacji: EN

Abstrakty

EN

Activated blood platelets shed microparticles with procoagulant activity that probably participate in normal hemostasis. We have isolated spontaneously formed microparticles from human blood and analysed them for ultrastructure, antigenic profile, and biochemical composition. In transmission electron microscopy microparticles appeared as regular vesicles with a mean diameter of 300 nm (50-600 nm). In flow cytometry almost all microparticles reacted with fluorescein isothiocyanate (FITC) labeled antibody to platelet glycoprotein complex IIb-IIIa (GpIIb-IIIa) and with FITC-annexin V but only 40-50% of microparticles reacted with FITC-antibody to platelet glycoprotein Ib (GpIb). The latter result was confirmed by double labeling of microparticles with FITC-antibody to GpIIb-IIIa and phycoerythrin (PE) labeled antibody to GpIb. Large microparticles reacted better with anti-GpIb than the small ones. A decreased level of GpIb was also demonstrated by SDS/polyacrylamide gel electrophoresis of microparticles. Compositional studies indicated, that in terms of cholesterol and protein contents, microparticles resembled platelets rather than platelet membranes as previously thought. They are, however, deficient in certain components. Thus, in comparison to platelets, microparticles had reduced contents of sialic acid (by 56.4%), galactosamine (by 48.2%), glucosamine (by 22.4%), galactose by (11.8%) and fucose (by 21.6%). Mannose content was increased by 11.8%. Total phospholipids in microplatelets were lower by 17.8%. Glycerophospholipids only were affected with phosphatidylserine being decreased as much as by 43.2%. Neutral glycosphingolipids, gangliosides and ceramides in microparticles were reduced by half. We conclude that the biochemical composition of microparticles probably reflects previous activation of progenitor platelets

Słowa kluczowe

EN

glycoprotein; ceramide; glycosphingolipid; human blood; blood; carbohydrate; phospholipid; antibody; sialic acid; lipid; hemostasis; platelet; protein content

• Wydawca: -
• Czasopismo: Acta Biochimica Polonica
• Rocznik: 1998
• Tom: 45
• Numer: 2
• Opis fizyczny: p.417-428,fig.

Twórcy

autor

Zdebska E.

• Institute of Hematology and Blood Transfusion, Warsaw, Poland

autor

Wozniak J.

autor

Dzieciatkowska A.

autor

Koscielak J.

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