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Related Concept Videos

Autoimmune Disorders01:29

Autoimmune Disorders

Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
The immune system...
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.
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 platelets, with...
Formation of the Platelet Plug01:22

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.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Inflammation01:38

Inflammation

Overview
T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...

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Related Experiment Video

Updated: May 12, 2026

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
09:46

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells

Published on: December 27, 2017

Platelets and autoimmunity.

Kim L L Habets1, Tom W J Huizinga, René E M Toes

  • 1Department of Rheumatology, Leiden University Medical Center, Leiden, The Netherlands. k.l.l.habets@lumc.nl

European Journal of Clinical Investigation
|April 27, 2013
PubMed
Summary
This summary is machine-generated.

Platelets, crucial for blood clotting, also play significant roles in regulating immunity and inflammation. Understanding their complex functions could lead to better treatments for autoimmune diseases and reduce thrombosis.

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

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Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice
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Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice

Published on: April 2, 2013

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Last Updated: May 12, 2026

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
09:46

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells

Published on: December 27, 2017

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

Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice
11:18

Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice

Published on: April 2, 2013

Area of Science:

  • Immunology
  • Hematology
  • Vascular Biology

Background:

  • Vascular injury triggers inflammation and cell recruitment.
  • Platelets monitor vascular integrity and activate upon subendothelium exposure.
  • Platelets possess significant immunoregulatory functions beyond hemostasis.

Purpose of the Study:

  • To review the multifaceted roles of platelets in immunity and inflammation.
  • To discuss platelet involvement in autoimmune diseases.
  • To explore potential therapeutic implications of platelet functions.

Main Methods:

  • Literature review of current research on platelet immunobiology.
  • Analysis of platelet interactions with inflammatory mediators and complement system.
  • Examination of platelet contributions to autoimmune disease pathogenesis.

Main Results:

  • Platelets release numerous cytokines, chemokines, and growth factors.
  • Platelets are a major source of inflammatory mediators like P-selectin and CD40L.
  • Complement activation on platelet surfaces leads to further platelet activation.
  • Platelets are implicated in both innate and adaptive immunity.

Conclusions:

  • Platelets have diverse functions in immune responses and inflammation.
  • Understanding platelet roles offers insights for therapeutic strategies.
  • Targeting platelet activity may help manage autoimmune diseases and thrombosis.