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- W2078505527 abstract "Phosphatidylinositol (PI) specific phospholipase C (PIase C) treatment of human platelets caused release of a surface glycoprotein in the medium. Human blood platelets were isolated by low speed centrifugation and surface glycoproteins were labelled with periodate/[3H]borohydride procedure. Intact surface-labelled platelets were treated with PIase C purified from culture filtrates of Staphylococcus aureus (SA) or Bacillus thuringiensis (BT). After PIase C treatments platelets were spun at low speed, pellet and supernatant were separated. The supernatant was further centrifuged at high speed (140,000 x g) for 30 min. The resulting supernatant and the pellet from low speed were subjected to SDS-PAGE analysis. Protein patterns were obtained by fluorography. Release of a specific glycoprotein of approx. 150 kDa in the medium was observed due to the PIase C treatment. Prolonged incubation of platelets in 0.25 M sucrose and depletion of NaCl concentrations also affected the release of this glycoprotein. BT-PIase C released more approx. 150 kDa protein than SA-PIase C. Western blot experiment with a monoclonal antibody (mAB), epitope SZ2, reactive to human platelet surface glycoprotein Ib (GPIb) complex, confirmed that released 150 kDa glycoprotein reacted with mAB of GPIb. The release of this protein by PIase C was not inhibited by proteinase inhibitors (EDTA, PMSF and leupeptin). Treatment of human platelet membranes with PIase C also caused release of this glycoprotein as evidenced by reactivity to GPIb-mAB. These studies demonstrate that PIase C treatment causes release of 150 kDa glycoprotein from human platelet membrane surface. It is suggested that 150 kDa glycoprotein is anchored to PI in human platelets and that this glycoprotein represents the GPIb complex." @default.
- W2078505527 created "2016-06-24" @default.
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- W2078505527 date "1991-01-01" @default.
- W2078505527 modified "2023-09-27" @default.
- W2078505527 title "Release of a membrane surface glycoprotein from human platelets by phosphatidylinositol specific phospholipase(s) C" @default.
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- W2078505527 doi "https://doi.org/10.1016/0167-4889(91)90215-j" @default.
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