Abstract
Stable platelet aggregation, adhesion, and spreading during hemostasis are promoted by outside-in alphaIIbbeta3 signals that feature rapid activation of c-Src and Syk, delayed activation of FAK, and cytoskeletal reorganization. To evaluate these alphaIIbbeta3-tyrosine kinase interactions at nanometer proximity in living cells, we monitored bioluminescence resonance energy transfer between GFP and Renilla luciferase chimeras and bimolecular fluorescence complementation between YFP half-molecule chimeras. These techniques revealed that alphaIIbbeta3 interacts with c-Src at the periphery of nonadherent CHO cells. After plating cells on fibrinogen, complexes of alphaIIbbeta3-c-Src, alphaIIbbeta3-Syk, and c-Src-Syk are observed in membrane ruffles and focal complexes, and the interactions involving Syk require Src activity. In contrast, FAK interacts with alphaIIbbeta3 and c-Src, but not with Syk, in focal complexes and adhesions. All of these interactions require the integrin beta3 cytoplasmic tail. Thus, alphaIIbbeta3 interacts proximally, if not directly, with tyrosine kinases in a coordinated, selective, and dynamic manner during sequential phases of alphaIIbbeta3 signaling to the actin cytoskeleton.
Copyright the Rockefeller University Press
Publication types
-
Research Support, U.S. Gov't, P.H.S.
MeSH terms
-
Animals
-
CHO Cells
-
CSK Tyrosine-Protein Kinase
-
Cell Adhesion / genetics
-
Cell Membrane Structures / enzymology*
-
Cell Membrane Structures / ultrastructure
-
Cricetinae
-
Cytoskeleton / metabolism*
-
Cytoskeleton / ultrastructure
-
Enzyme Precursors / genetics
-
Enzyme Precursors / metabolism*
-
Fluorescence Resonance Energy Transfer
-
Focal Adhesion Protein-Tyrosine Kinases
-
Focal Adhesions / enzymology
-
Focal Adhesions / ultrastructure
-
Green Fluorescent Proteins
-
Intracellular Signaling Peptides and Proteins
-
Luciferases / genetics
-
Luciferases / metabolism
-
Luminescent Proteins / genetics
-
Luminescent Proteins / metabolism
-
Macromolecular Substances
-
Platelet Glycoprotein GPIIb-IIIa Complex / metabolism*
-
Protein-Tyrosine Kinases / genetics
-
Protein-Tyrosine Kinases / metabolism*
-
Recombinant Fusion Proteins / genetics
-
Recombinant Fusion Proteins / metabolism
-
Signal Transduction / genetics
-
Syk Kinase
-
src-Family Kinases
Substances
-
Enzyme Precursors
-
Intracellular Signaling Peptides and Proteins
-
Luminescent Proteins
-
Macromolecular Substances
-
Platelet Glycoprotein GPIIb-IIIa Complex
-
Recombinant Fusion Proteins
-
Green Fluorescent Proteins
-
Luciferases
-
Protein-Tyrosine Kinases
-
CSK Tyrosine-Protein Kinase
-
Focal Adhesion Protein-Tyrosine Kinases
-
Syk Kinase
-
src-Family Kinases