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Related Experiment Videos

Talin distribution and phosphorylation in thrombin-activated platelets

M E Bertagnolli1, S J Locke, M E Hensler

  • 1Department of Biology, University of Utah, Salt Lake City 84112.

Journal of Cell Science
|December 1, 1993
PubMed
Summary

Platelet activation causes talin, an adhesion protein, to move to the cell membrane. This redistribution is not due to protein cleavage or interaction with GPIIb-IIIa, but may involve talin phosphorylation.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Hematology

Background:

  • Talin, an adhesion plaque protein, changes distribution in human platelets upon activation.
  • Resting platelets show uniform talin distribution, while activated platelets exhibit peripheral talin localization.

Purpose of the Study:

  • To investigate talin phosphorylation and proteolytic cleavage as regulatory mechanisms for talin redistribution in activated platelets.
  • To determine if the integrin GPIIb-IIIa is required for talin redistribution during platelet activation.

Main Methods:

  • Examined talin phosphorylation and proteolytic cleavage in thrombin-activated human platelets.
  • Utilized Glanzmann thrombasthenic platelets (deficient in GPIIb-IIIa) to assess talin redistribution in the absence of this integrin.

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Main Results:

  • Thrombin activation increased talin phosphorylation fourfold.
  • Proteolytic cleavage of talin was not detected in activated platelets.
  • Talin redistribution to the cell periphery occurred in Glanzmann thrombasthenic platelets, independent of GPIIb-IIIa.

Conclusions:

  • Neither talin proteolytic cleavage nor interaction with GPIIb-IIIa is necessary for talin redistribution in activated platelets.
  • Talin phosphorylation is a potential mechanism regulating talin distribution and function in human platelets.