Adhesion receptor activation of phosphatidylinositol 3-Kinase

Von Willebrand factor stimulates the cytoskeletal association and activation of phosphatidylinositol 3-kinase and pp60c-src in human platelets

Shaun P. Jackson, Simone M. Schoenwaelder, Yuping Yuan, Ian Rabinowitz, Hatem H. Salem, Christina A. Mitchell

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    Abstract

    The cytoskeleton participates in the coordinated regulation of intracellular signaling molecules, following agonist stimulation of cells. We have demonstrated that von Willebrand factor (vWF) induced the cytoskeletal association and activation of phosphatidylinositol 3-kinase (PtdIns 3-kinase) in human platelets. The activation of PtdIns 3-kinase coincided with the tyrosine phosphorylation of multiple platelet proteins, as assessed by anti-phosphotyrosine immunoblotting. One of these tyrosine-phosphorylated proteins, pp60c-src, became specifically enriched in the cytoskeletal fraction of vWF-stimulated platelets. The vWF-stimulated cytoskeletal association of Ptdlns 3-kinase and pp60c-src required platelet stirring and aggregation, was specifically blocked by an anti-GPIb monoclonal antibody, and was not observed in platelets lacking the glycoprotein Ib/IX complex (Bernard-Soulier syndrome). Pretreatment of normal platelets with 5 mM EDTA (37 °C for 90 min) or RGDS (2 mM), which disrupts the binding of various adhesive proteins to platelet integrins and inhibits fibrinogen-mediated platelet aggregation, did not alter the vWF-stimulated activation and cytoskeletal association of Ptdlns 3-kinase and pp60c-src. Pretreatment of platelets with acetylsalicylic acid (1 mM) completely abolished vWF-stimulated production of thromboxane A2, dense granule release, and the activation of protein kinase C, without altering the activation and cytoskeletal translocation of Ptdlns 3-kinase and pp60c-src. Our results suggest that vWF binding to the platelet adhesion receptor glycoprotein Ib/IX can mediate activation and translocation of both tyrosine and lipid kinase(s) independent of other agonists.

    Original languageEnglish
    Pages (from-to)27093-27099
    Number of pages7
    JournalJournal of Biological Chemistry
    Volume269
    Issue number43
    Publication statusPublished - 28 Oct 1994

    Cite this

    @article{c0a8dacdaaa54e138fc7052a6bb642e5,
    title = "Adhesion receptor activation of phosphatidylinositol 3-Kinase: Von Willebrand factor stimulates the cytoskeletal association and activation of phosphatidylinositol 3-kinase and pp60c-src in human platelets",
    abstract = "The cytoskeleton participates in the coordinated regulation of intracellular signaling molecules, following agonist stimulation of cells. We have demonstrated that von Willebrand factor (vWF) induced the cytoskeletal association and activation of phosphatidylinositol 3-kinase (PtdIns 3-kinase) in human platelets. The activation of PtdIns 3-kinase coincided with the tyrosine phosphorylation of multiple platelet proteins, as assessed by anti-phosphotyrosine immunoblotting. One of these tyrosine-phosphorylated proteins, pp60c-src, became specifically enriched in the cytoskeletal fraction of vWF-stimulated platelets. The vWF-stimulated cytoskeletal association of Ptdlns 3-kinase and pp60c-src required platelet stirring and aggregation, was specifically blocked by an anti-GPIb monoclonal antibody, and was not observed in platelets lacking the glycoprotein Ib/IX complex (Bernard-Soulier syndrome). Pretreatment of normal platelets with 5 mM EDTA (37 °C for 90 min) or RGDS (2 mM), which disrupts the binding of various adhesive proteins to platelet integrins and inhibits fibrinogen-mediated platelet aggregation, did not alter the vWF-stimulated activation and cytoskeletal association of Ptdlns 3-kinase and pp60c-src. Pretreatment of platelets with acetylsalicylic acid (1 mM) completely abolished vWF-stimulated production of thromboxane A2, dense granule release, and the activation of protein kinase C, without altering the activation and cytoskeletal translocation of Ptdlns 3-kinase and pp60c-src. Our results suggest that vWF binding to the platelet adhesion receptor glycoprotein Ib/IX can mediate activation and translocation of both tyrosine and lipid kinase(s) independent of other agonists.",
    author = "Jackson, {Shaun P.} and Schoenwaelder, {Simone M.} and Yuping Yuan and Ian Rabinowitz and Salem, {Hatem H.} and Mitchell, {Christina A.}",
    year = "1994",
    month = "10",
    day = "28",
    language = "English",
    volume = "269",
    pages = "27093--27099",
    journal = "Journal of Biological Chemistry",
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    publisher = "American Society for Biochemistry and Molecular Biology",
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    Adhesion receptor activation of phosphatidylinositol 3-Kinase : Von Willebrand factor stimulates the cytoskeletal association and activation of phosphatidylinositol 3-kinase and pp60c-src in human platelets. / Jackson, Shaun P.; Schoenwaelder, Simone M.; Yuan, Yuping; Rabinowitz, Ian; Salem, Hatem H.; Mitchell, Christina A.

    In: Journal of Biological Chemistry, Vol. 269, No. 43, 28.10.1994, p. 27093-27099.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Adhesion receptor activation of phosphatidylinositol 3-Kinase

    T2 - Von Willebrand factor stimulates the cytoskeletal association and activation of phosphatidylinositol 3-kinase and pp60c-src in human platelets

    AU - Jackson, Shaun P.

    AU - Schoenwaelder, Simone M.

    AU - Yuan, Yuping

    AU - Rabinowitz, Ian

    AU - Salem, Hatem H.

    AU - Mitchell, Christina A.

    PY - 1994/10/28

    Y1 - 1994/10/28

    N2 - The cytoskeleton participates in the coordinated regulation of intracellular signaling molecules, following agonist stimulation of cells. We have demonstrated that von Willebrand factor (vWF) induced the cytoskeletal association and activation of phosphatidylinositol 3-kinase (PtdIns 3-kinase) in human platelets. The activation of PtdIns 3-kinase coincided with the tyrosine phosphorylation of multiple platelet proteins, as assessed by anti-phosphotyrosine immunoblotting. One of these tyrosine-phosphorylated proteins, pp60c-src, became specifically enriched in the cytoskeletal fraction of vWF-stimulated platelets. The vWF-stimulated cytoskeletal association of Ptdlns 3-kinase and pp60c-src required platelet stirring and aggregation, was specifically blocked by an anti-GPIb monoclonal antibody, and was not observed in platelets lacking the glycoprotein Ib/IX complex (Bernard-Soulier syndrome). Pretreatment of normal platelets with 5 mM EDTA (37 °C for 90 min) or RGDS (2 mM), which disrupts the binding of various adhesive proteins to platelet integrins and inhibits fibrinogen-mediated platelet aggregation, did not alter the vWF-stimulated activation and cytoskeletal association of Ptdlns 3-kinase and pp60c-src. Pretreatment of platelets with acetylsalicylic acid (1 mM) completely abolished vWF-stimulated production of thromboxane A2, dense granule release, and the activation of protein kinase C, without altering the activation and cytoskeletal translocation of Ptdlns 3-kinase and pp60c-src. Our results suggest that vWF binding to the platelet adhesion receptor glycoprotein Ib/IX can mediate activation and translocation of both tyrosine and lipid kinase(s) independent of other agonists.

    AB - The cytoskeleton participates in the coordinated regulation of intracellular signaling molecules, following agonist stimulation of cells. We have demonstrated that von Willebrand factor (vWF) induced the cytoskeletal association and activation of phosphatidylinositol 3-kinase (PtdIns 3-kinase) in human platelets. The activation of PtdIns 3-kinase coincided with the tyrosine phosphorylation of multiple platelet proteins, as assessed by anti-phosphotyrosine immunoblotting. One of these tyrosine-phosphorylated proteins, pp60c-src, became specifically enriched in the cytoskeletal fraction of vWF-stimulated platelets. The vWF-stimulated cytoskeletal association of Ptdlns 3-kinase and pp60c-src required platelet stirring and aggregation, was specifically blocked by an anti-GPIb monoclonal antibody, and was not observed in platelets lacking the glycoprotein Ib/IX complex (Bernard-Soulier syndrome). Pretreatment of normal platelets with 5 mM EDTA (37 °C for 90 min) or RGDS (2 mM), which disrupts the binding of various adhesive proteins to platelet integrins and inhibits fibrinogen-mediated platelet aggregation, did not alter the vWF-stimulated activation and cytoskeletal association of Ptdlns 3-kinase and pp60c-src. Pretreatment of platelets with acetylsalicylic acid (1 mM) completely abolished vWF-stimulated production of thromboxane A2, dense granule release, and the activation of protein kinase C, without altering the activation and cytoskeletal translocation of Ptdlns 3-kinase and pp60c-src. Our results suggest that vWF binding to the platelet adhesion receptor glycoprotein Ib/IX can mediate activation and translocation of both tyrosine and lipid kinase(s) independent of other agonists.

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    M3 - Article

    VL - 269

    SP - 27093

    EP - 27099

    JO - Journal of Biological Chemistry

    JF - Journal of Biological Chemistry

    SN - 1083-351X

    IS - 43

    ER -