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Related Concept Videos

Structure and Function of Platelets01:18

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
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Formation of the Platelet Plug

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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Introduction to Hemostasis01:05

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Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Alternative Methods for the Detection of Superoxide Anion Generation in Platelets
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Published on: March 29, 2024

STIM and Orai in platelet function.

David Varga-Szabo1, Attila Braun, Bernhard Nieswandt

  • 1Helios Klinikum Wuppertal, Klinik für Allgemein- und Viszeralchirurgie, Wuppertal, Germany.

Cell Calcium
|May 28, 2011
PubMed
Summary
This summary is machine-generated.

Platelet calcium signaling is crucial for blood clotting and preventing bleeding. Recent research identifies Stromal interaction molecule 1 (STIM1) and Orai1 as key players in store-operated calcium entry (SOCE) and platelet function.

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Last Updated: Jun 1, 2026

Alternative Methods for the Detection of Superoxide Anion Generation in Platelets
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Alternative Methods for the Detection of Superoxide Anion Generation in Platelets

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An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers
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A Uniform Shear Assay for Human Platelet and Cell Surface Receptors via Cone-plate Viscometry
04:32

A Uniform Shear Assay for Human Platelet and Cell Surface Receptors via Cone-plate Viscometry

Published on: June 5, 2019

Area of Science:

  • * Molecular biology
  • * Cellular physiology
  • * Hematology

Background:

  • * Platelet activation is vital for hemostasis but can cause pathological thrombosis in disease.
  • * Intracellular calcium (Ca2+) elevation is central to platelet activation, involving both release from stores and extracellular influx.
  • * Store-operated calcium entry (SOCE) is the primary Ca2+ influx pathway in platelets, triggered by store depletion.

Purpose of the Study:

  • * To review the molecular mechanisms of platelet SOCE.
  • * To highlight the roles of Stromal interaction molecule 1 (STIM1) and Orai1 in platelet physiology.
  • * To discuss the involvement of STIM1 and Orai1 in platelet apoptosis and related processes.

Main Methods:

  • * Review of recent scientific literature (last five years).
  • * Focus on molecular identification and functional characterization of STIM1 and Orai1.
  • * Analysis of STIM1 and Orai1 roles in platelet calcium signaling and thrombus formation.

Main Results:

  • * STIM1 identified as the endoplasmic reticulum Ca2+ sensor.
  • * Orai1 identified as the plasma membrane SOC channel.
  • * STIM1 and Orai1 are critical for agonist-induced Ca2+ influx in platelets.

Conclusions:

  • * STIM1 and Orai1 are essential components of the SOCE machinery in platelets.
  • * These molecules play significant roles in regulating platelet function, including thrombus formation.
  • * Further research into STIM1 and Orai1 may offer insights into platelet-related disorders and apoptosis.