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Related Concept Videos

Structure and Function of Platelets01:18

Structure and Function of Platelets

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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.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...
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Endoplasmic Reticulum01:39

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The Endoplasmic Reticulum (ER) in eukaryotic cells is a substantial network of interconnected membranes with diverse functions, from calcium storage to biomolecule synthesis. A primary component of the endomembrane system, the ER manufactures phospholipids critical for membrane function throughout the cell. Additionally, the two distinct regions of the ER specialize in the manufacture of specific lipids and proteins.
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The Endoplasmic Reticulum01:43

The Endoplasmic Reticulum

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The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...
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Assembly of the Lipid Bilayer in the ER01:28

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Formation of the Platelet Plug01:22

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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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Directing Proteins to the Rough Endoplasmic Reticulum01:34

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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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Related Experiment Video

Updated: Jul 4, 2025

An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers
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"Sticki-ER": Functions of the Platelet Endoplasmic Reticulum.

Yvonne X Kong1,2,3, Joyce Chiu4, Freda H Passam1,2,3

  • 1Haematology Research Group, Charles Perkins Centre; The University of Sydney, Camperdown, New South Wales, Australia.

Antioxidants & Redox Signaling
|January 29, 2024
PubMed
Summary
This summary is machine-generated.

Platelets utilize the endoplasmic reticulum (ER) for calcium release and protein folding, crucial for thrombus formation. Understanding ER homeostasis and protein regulation in platelets is key for therapeutic insights.

Keywords:
calciumchaperonesendoplasmic reticulumplateletsprotein disulfide isomerasesprotein synthesisredoxstress

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Last Updated: Jul 4, 2025

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Area of Science:

  • Hematology
  • Cell Biology
  • Biochemistry

Background:

  • Platelets are critical for hemostasis, forming thrombi via activation and calcium mobilization from the endoplasmic reticulum (ER).
  • ER resident proteins, including protein disulfide isomerases (PDIs) and chaperones, are externalized during platelet activation, influencing receptor function and intercellular signaling.
  • Platelet ER homeostasis, involving redox balance, calcium regulation, and protein folding, is essential for cellular function but incompletely understood.

Purpose of the Study:

  • To investigate the role of the platelet endoplasmic reticulum (ER) in maintaining cellular function and homeostasis.
  • To explore the intracellular functions of ER resident proteins, particularly protein disulfide isomerases (PDIs), in platelets.
  • To elucidate the mechanisms by which platelet ER proteins control calcium release and intercellular signaling.

Main Methods:

  • Analysis of ER resident proteins, including PDIs and chaperones, in platelets.
  • Investigation of ER homeostasis, redox balance, and protein folding within platelets.
  • Evaluation of calcium release mechanisms regulated by platelet ER proteins.

Main Results:

  • Platelet ER proteins are externalized upon ER stress, impacting platelet surface receptor function and intercellular communication.
  • Intracellular roles of PDIs in platelets are distinct from their extracellular functions, affecting platelet activities like secretion and adhesion.
  • Platelet ER dysfunction is linked to altered calcium homeostasis and protein folding, potentially impacting thrombus formation.

Conclusions:

  • The platelet ER is central to platelet function, regulating critical activities such as secretion and adhesion.
  • Further research into the intracellular versus extracellular redox functions of PDIs is necessary to understand their differential effects on platelet activity.
  • Understanding platelet ER stress pathways and protein regulation may offer therapeutic targets for metabolic and neoplastic diseases.