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Related Experiment Videos

Reduction of platelet surface GPIb expression induced by polymorphonuclear leukocytes

M Schattner1, A Kempfer, J Geffner

  • 1Departamento de Trombosis y Hemostasia, Instituto de Investigaciones Hematologicas, Academia Nacional de Medicina, Buenos Aires, Argentina.

Thrombosis Research
|August 1, 1995
PubMed
Summary

Polymorphonuclear neutrophils (PMNs) can inhibit platelet aggregation through a non-nitric oxide (NO) dependent mechanism. This study investigates how PMNs affect platelet surface receptors GPIb-IX and GPIIb-IIIa, impacting adhesion and aggregation.

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Area of Science:

  • Hematology
  • Immunology
  • Cellular Biology

Background:

  • Soluble factors from polymorphonuclear neutrophils (PMNs) can activate platelets.
  • PMNs may also inhibit platelet function, potentially via nitric oxide (NO) release.
  • Previous observations indicate PMNs inhibit platelet aggregation and ATP release via a non-NO mechanism.

Purpose of the Study:

  • To investigate the mechanism by which unstimulated PMNs inhibit platelet function.
  • To evaluate the effect of PMNs on the expression of platelet glycoproteins GPIb-IX and GPIIb-IIIa.

Main Methods:

  • Coincubation of platelets with unstimulated PMNs.
  • Assessment of platelet aggregation and adenosine triphosphate (ATP) release.
  • Evaluation of the expression of platelet glycoproteins GPIb-IX and GPIIb-IIIa.

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Main Results:

  • Unstimulated PMNs inhibit platelet aggregation and ATP release.
  • The inhibitory mechanism does not involve nitric oxide (NO).
  • PMNs modulate the expression of platelet surface receptors GPIb-IX and GPIIb-IIIa.

Conclusions:

  • PMNs influence platelet function through a novel, non-NO dependent pathway.
  • Alterations in platelet glycoprotein expression by PMNs may underlie inhibited platelet responses.
  • Further research is needed to fully elucidate the non-identified mechanism.