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Related Experiment Videos

Two thrombin-activated Ca2+ channels in human platelets.

Y Hashimoto1, A Ogihara, S Nakanishi

  • 1First Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Japan.

The Journal of Biological Chemistry
|August 25, 1992
PubMed
Summary

Thrombin stimulation causes rapid and sustained calcium influx in human platelets. Myosin light chain kinase inhibition affects only the sustained phase, suggesting distinct calcium channels for early and late entry.

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Area of Science:

  • * Platelet physiology and calcium signaling.
  • * Molecular mechanisms of ion channel regulation.

Background:

  • * Extracellular calcium influx is critical for platelet activation and function.
  • * Thrombin is a key physiological activator of platelets, leading to intracellular calcium increases.

Purpose of the Study:

  • * To investigate the regulation of extracellular calcium entry into human platelets stimulated by thrombin.
  • * To elucidate the role of myosin light chain kinase in thrombin-induced calcium signaling.

Main Methods:

  • * Measurement of intracellular calcium concentration ([Ca2+]i) using fura-2 in human platelets.
  • * Stimulation with thrombin in the presence and absence of external calcium.
  • * Pretreatment with wortmannin, a myosin light chain kinase inhibitor.

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Main Results:

  • * Thrombin induced a rapid initial increase and a subsequent plateau in [Ca2+]i.
  • * Wortmannin inhibited the plateau phase but not the initial rapid calcium increase.
  • * Wortmannin significantly inhibited late but not early extracellular calcium entry after thrombin stimulation.

Conclusions:

  • * Human platelets utilize distinct mechanisms for early and late extracellular calcium entry following thrombin stimulation.
  • * Myosin light chain kinase activation is involved in the regulation of late-phase calcium entry.
  • * These findings suggest the involvement of at least two different calcium channels in thrombin-activated platelets.