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The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
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Updated: Nov 10, 2025

Turbidimetry on Human Washed Platelets: The Effect of the Pannexin1-inhibitor Brilliant Blue FCF on Collagen-induced Aggregation
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Mind the gap: connexins and pannexins in platelet function.

Kirk A Taylor1,2, Gemma Little1, Jonathan M Gibbins1

  • 1Institute for Cardiovascular and Metabolic Research, University of Reading, Reading, UK.

Platelets
|April 5, 2021
PubMed
Summary

Platelets utilize pannexins and connexins for non-vesicular ATP release. These channels, activated by stimuli like mechanical stress, are potential drug targets for arterial thrombosis.

Keywords:
Platelets; Ion Channel; Connexin; Pannexin-1; Gap junction

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Pharmacology

Background:

  • Connexins form gap junctions, while pannexins function as membrane channels.
  • Platelets express pannexin-1 and connexins (Cx37, Cx40, Cx62).
  • These channels allow passage of molecules up to 1,000 Daltons.

Purpose of the Study:

  • To review the structure and function of platelet pannexin-1 and connexins.
  • To explore the gating mechanisms of these channels.
  • To discuss their therapeutic potential in arterial thrombosis.

Main Methods:

  • Literature review of connexin and pannexin channel function in platelets.
  • Analysis of structural and functional data related to platelet channels.
  • Exploration of (patho)physiological stimuli regulating channel activity.

Main Results:

  • Platelet pannexins and connexins facilitate non-vesicular ATP release.
  • Channel activation is modulated by mechanical stimulation and other stimuli.
  • These channels represent potential therapeutic targets.

Conclusions:

  • Platelet pannexin-1 and connexins play crucial roles in cellular communication and ATP release.
  • Understanding their gating mechanisms is key to developing targeted therapies.
  • Targeting these channels offers promise for managing arterial thrombosis.