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Related Experiment Video

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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

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Platelet particle processing: an example of surface sorting on single cells.

J G White¹, D Cocking-Johnson, M Krumwiede

¹Departments of Laboratory Medicine, Pathology and Pediatrics, University of Minnesota Health Sciences Center, UMHC Box 490, 420 Delaware Street S.E, Minneapolis, Minnesota, 55455, USA.

|November 4, 2010

Summary

This summary is machine-generated.

Platelet glycoprotein IIb-IIIa receptors move ligands and antibodies toward cell centers. This study shows simple diffusion does not explain this movement, suggesting active transport mechanisms are involved in platelet receptor dynamics.

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Area of Science:

Biochemistry
Cell Biology
Hematology

Background:

Platelet glycoprotein IIb-IIIa (GPIIb-IIIa) receptors bind ligands and antibodies.
Receptor-ligand complex translocation to platelet centers is known but the mechanism is unclear.

Purpose of the Study:

To investigate the mechanism of receptor-ligand translocation in activated platelets.
To differentiate between simple diffusion and other forces in receptor complex movement.

Main Methods:

Simultaneous addition of two different electron-dense probes (latex particles and fibrinogen-coupled gold nanoparticles) to activated platelets.
Observation of probe clearance rates from platelet margins to cell centers over a 5-minute incubation period.
Comparison of movement rates for different sized latex particles.

Main Results:

Small latex particles were cleared faster than fibrinogen-coupled gold nanoparticles.
Large and small latex particles moved at the same rate when mixed and added together.
Both latex particle types concentrated together in the cell centers.

Conclusions:

Simple diffusion is unlikely to be the primary force driving receptor complex movement on platelet plasma membranes.
The differential clearance rates suggest an active, possibly size-selective, transport mechanism.
Further research is needed to elucidate the precise molecular machinery involved in GPIIb-IIIa receptor translocation.