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The activation-induced decrease in the platelet surface expression of the glycoprotein Ib-IX complex is reversible

A D Michelson1, S E Benoit, M H Kroll

  • 1Department of Pediatrics, University of Massachusetts Medical School, Worcester 01655.

Blood
|June 15, 1994
PubMed
Summary
This summary is machine-generated.

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Platelet glycoprotein (GP) Ib-IX complex surface expression decreases with thrombin activation but is reversible. This reexpression involves internal GPIb-IX pools and is influenced by protein kinase C and myosin light-chain kinase activity.

Area of Science:

  • Hematology
  • Cell Biology
  • Biochemistry

Background:

  • Thrombin stimulation reduces platelet surface glycoprotein (GP) Ib-IX complex expression.
  • The reversibility and underlying mechanisms of this reduction are not fully understood.

Purpose of the Study:

  • To investigate the reversibility of thrombin-induced decrease in platelet GPIb-IX surface expression.
  • To identify mechanisms involved in the reexpression of platelet GPIb-IX.

Main Methods:

  • Flow cytometry using GPIb-IX-specific monoclonal antibodies on whole blood and washed platelets.
  • Incubation with thrombin or ADP/epinephrine, followed by time-dependent analysis.
  • Tracking GPIb molecule translocation using biotinylated antibodies and assessing von Willebrand factor binding.

Related Experiment Videos

Main Results:

  • Platelet GPIb-IX surface expression decreased rapidly (within 5 minutes) upon activation but returned to maximal levels within 60 minutes.
  • The returning GPIb molecules originated from an intraplatelet pool and were functionally competent for von Willebrand factor binding.
  • Inhibitors of protein kinase C and myosin light-chain kinase enhanced GPIb reexpression.

Conclusions:

  • The activation-induced decrease in platelet surface GPIb-IX complex expression is a reversible process.
  • Reexpression of GPIb-IX involves the translocation of internal molecules to the surface.
  • Inhibition of protein kinase C and myosin light-chain kinase plays a crucial role in GPIb-IX reexpression.