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Related Experiment Videos

Thrombin-induced protein phosphorylation in human platelets.

R M Lyons, N Stanford, P W Majerus

    The Journal of Clinical Investigation
    |October 1, 1975
    PubMed
    Summary
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    This study reveals that thrombin significantly increases the phosphorylation of two specific platelet proteins, peak 7 and peak 9. This phosphorylation is linked to the platelet release reaction and requires intact platelets.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Hematology

    Background:

    • Platelets contain multiple phosphorylated proteins.
    • Thrombin is a key activator of platelet function.

    Purpose of the Study:

    • To investigate the role of protein phosphorylation in thrombin-induced platelet activation.
    • To identify proteins whose phosphorylation is modulated by thrombin.

    Main Methods:

    • Intact human platelets were loaded with 32PO4 and treated with thrombin.
    • Protein phosphorylation was analyzed using SDS-PAGE and gel filtration.
    • Protein kinase activity was assessed in platelet sonicates and fractions.

    Main Results:

    • Thrombin increased phosphorylation of peak 7 (~40 kDa) and peak 9 (~20 kDa) proteins.

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  • Phosphorylation was rapid (half-maximal at 10-14 s) and dose-dependent.
  • Dibutyryl cyclic AMP and prostaglandin E1 inhibited thrombin-induced phosphorylation.
  • Phytohemagglutinin also induced phosphorylation of these proteins.
  • Thrombin-dependent phosphorylation required intact platelets.
  • Two protein kinases, cAMP-dependent and independent, were identified.

    • Conclusions:

    • Phosphorylation of peak 7 and peak 9 proteins is closely associated with the platelet release reaction.
    • These phosphorylation events may play a crucial role in platelet activation and function.
    • Thrombin-mediated phosphorylation of these proteins is an intact-platelet phenomenon.