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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.
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...
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Receptor-mediated Endocytosis

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Transducer Mechanism: Enzyme-Linked Receptors01:27

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Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
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Updated: Jun 2, 2026

A Uniform Shear Assay for Human Platelet and Cell Surface Receptors via Cone-plate Viscometry
04:32

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Published on: June 5, 2019

HDL scavenger receptor class B type I and platelet function.

Jerzy-Roch Nofer1, Miranda van Eck

  • 1Center for Laboratory Medicine, University Hospital Münster, Münster, Germany. nofer@uni-muenster.de

Current Opinion in Lipidology
|May 4, 2011
PubMed
Summary

Scavenger receptor class B type I (SR-BI) on platelets regulates their reactivity and interaction with high-density lipoprotein (HDL). SR-BI deficiency increases platelet activation and thrombosis risk, highlighting its antithrombotic role.

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Area of Science:

  • Cardiovascular Biology
  • Platelet Physiology
  • Lipid Metabolism

Background:

  • High-density lipoprotein (HDL) exhibits antithrombotic properties, but its precise mechanisms for suppressing platelet reactivity remain unclear.
  • Scavenger receptor class B type I (SR-BI) is a key receptor for HDL, implicated in cholesterol homeostasis.

Purpose of the Study:

  • To review recent advancements in understanding SR-BI's role in modulating platelet function and HDL-platelet interactions.
  • To elucidate the molecular mechanisms by which HDL influences platelet activity through SR-BI.

Main Methods:

  • Review of existing literature on SR-BI, HDL, and platelet function.
  • Analysis of studies involving SR-BI knockout animals and human genetic variants.
  • Examination of platelet reactivity, morphology, and adherence assays.

Main Results:

  • SR-BI is expressed on platelets and its absence leads to increased platelet reactivity, abnormal morphology, and enhanced thrombus formation.
  • SR-BI deficiency impairs HDL's ability to inhibit platelet activation, while SR-BI ligands mimic HDL's inhibitory effects.
  • Functional platelet alterations in SR-BI knockout mice are mirrored in human carriers of SR-BI genetic variants.

Conclusions:

  • SR-BI influences platelet reactivity both indirectly through cholesterol homeostasis and directly as a functional receptor on platelets.
  • SR-BI activation by HDL generates an inhibitory signal, crucial for regulating platelet activation and preventing thrombosis.