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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets

Published on: November 29, 2024

Acidic Ca(2+) stores in platelets.

J A Rosado1

  • 1Department of Physiology, University of Extremadura, Av. Universidad s/n, Cáceres 10003, Spain. jarosado@unex.es

Cell Calcium
|December 21, 2010
PubMed
Summary
This summary is machine-generated.

Platelets store calcium in acidic organelles, not just the dense tubular system. This discovery reveals new insights into calcium signaling and platelet function regulation.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Hematology

Background:

  • Cytosolic free Ca(2+) concentration is crucial for regulating platelet functions like aggregation and secretion.
  • Platelet Ca(2+) release was traditionally attributed to the dense tubular system (DTS).
  • Emerging evidence suggests acidic organelles also store and release Ca(2+) in platelets.

Purpose of the Study:

  • To summarize current knowledge on the role of acidic organelles in agonist-evoked Ca(2+) mobilization.
  • To highlight recent advancements in understanding the functional significance of acidic Ca(2+) stores in platelet physiology.

Main Methods:

  • Review of existing literature on platelet Ca(2+) signaling.
  • Analysis of biochemical and biophysical properties of different Ca(2+) stores.
  • Investigation of agonist-specific Ca(2+) release mechanisms.

Main Results:

  • Platelets possess distinct Ca(2+) storage sites beyond the DTS, including acidic organelles.
  • Ca(2+) release from DTS involves phospholipase C and inositol 1,4,5-trisphosphate.
  • Ca(2+) efflux from acidic stores is linked to nicotinic acid adenine dinucleotide phosphate.
  • Differential Ca(2+) store discharge depends on platelet agonists and concentrations.

Conclusions:

  • Acidic organelles represent significant Ca(2+) stores in platelets, contributing to complex Ca(2+) signaling.
  • Understanding these acidic Ca(2+) stores is vital for comprehending platelet physiology and function.
  • Further research into acidic Ca(2+) stores may reveal novel therapeutic targets for platelet-related disorders.