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Related Experiment Videos

Sequential sodium-proton exchange in thrombin-induced human platelets.

T A Davies1, E Katona, V Vasilescu

  • 1Department of Biochemistry, Boston University School of Medicine, MA 02118.

Biochimica Et Biophysica Acta
|October 2, 1987
PubMed
Summary
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Thrombin-stimulated human platelets show altered ion flux and granule secretion in heavy water (2H2O). Results suggest sodium (Na+) and hydrogen (H+) fluxes are interdependent, impacting platelet activation.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Hematology

Background:

  • Thrombin stimulation of human platelets causes membrane depolarization and cytoplasmic alkalinization.
  • These events precede serotonin and beta-glucuronidase secretion from platelet granules.

Purpose of the Study:

  • To investigate the relationship between sodium (Na+) influx and proton (H+) efflux during thrombin-induced platelet activation.
  • To determine if these ion fluxes are simultaneous or sequential using heavy water (2H2O).

Main Methods:

  • Utilized Nuclear Magnetic Resonance (NMR) to confirm heavy water (2H2O) equilibration in platelets.
  • Measured membrane depolarization, cytoplasmic pH changes, and granule secretion (serotonin, beta-glucuronidase) in H2O and 2H2O.
  • Assessed the effects of dimethylamiloride on ion flux and pH changes.

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Main Results:

  • Heavy water (2H2O) significantly slowed and reduced membrane depolarization and cytoplasmic alkalinization in response to thrombin.
  • Serotonin secretion remained unchanged, while beta-glucuronidase secretion was enhanced in 2H2O.
  • Dimethylamiloride completely inhibited Na+ influx and pH change.

Conclusions:

  • Sodium (Na+) and proton (H+) fluxes across the platelet plasma membrane are interdependent but not simultaneous or electroneutral.
  • Granule secretion is influenced by cytoplasmic potassium (K+) and H+ concentrations, not solely the Na+ gradient.