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Related Experiment Videos

Low-density lipoprotein activates the small GTPases Rap1 and Ral in human platelets.

C M Hackeng1, B Franke, I A Relou

  • 1Department of Haematology, Institute for Biomembranes, University Medical Center Utrecht, P.O. Box 85500, 3508 GA Utrecht, The Netherlands.

The Biochemical Journal
|June 22, 2000
PubMed
Summary

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Low-density lipoprotein (LDL) activates platelet signaling proteins Rap1 and Ral, influencing platelet secretion. This research uncovers new pathways in LDL-mediated platelet activation.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Hematology

Background:

  • Physiological low-density lipoprotein (LDL) concentrations prime blood platelets for activation.
  • Prolonged LDL exposure can trigger platelet secretion independently of other agonists.

Purpose of the Study:

  • To investigate the specific signaling pathways activated by LDL in platelets.
  • To determine the role of small GTPases (Rap1, Ral, Ras) in LDL-induced platelet responses.

Main Methods:

  • Assessed GTP-bound small GTPases (Rap1, Ral, Ras) using specific precipitation.
  • Utilized inhibitors (SB203580, indomethacin, SQ30741) to probe signaling pathways.
  • Investigated platelet activation under stirred and unstirred conditions.

Main Results:

Related Experiment Videos

  • LDL activates Rap1 and Ral, but not Ras, in platelets.
  • Rap1 activation involves p38 mitogen-activated protein kinase and thromboxane A(2) (TxA(2)) formation.
  • A second, TxA(2)-independent Rap1 activation pathway is revealed under stirring, linked to dense granule secretion.
  • Neither pathway is affected by integrin alpha(IIb)beta(3) inhibitors.

Conclusions:

  • Rap1 and Ral are key players in LDL-initiated platelet signaling.
  • LDL signaling enhances platelet sensitivity to agonists and can independently trigger secretion.
  • Identified distinct LDL-mediated signaling routes impacting platelet function.