Primary platelet adhesion receptors

Jana Yip1, Yang Shen, Michael C Berndt

  • 1Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.

IUBMB Life
|July 23, 2005
PubMed

Insights

Platelet receptors glycoprotein (GP)Ib-IX-V and GPVI are key to forming blood clots. Understanding their function advances treatments for thrombotic diseases like heart attack and stroke.

Area of Science:

  • Biochemistry
  • Hematology
  • Molecular Biology

Background:

  • Thrombotic diseases, including heart attack and stroke, are significant health issues.
  • Existing anti-thrombotic drugs have limitations.
  • Platelets play a crucial role in hemostasis, inflammation, and atherogenesis.

Purpose of the Study:

  • To review recent advances in understanding the molecular mechanisms of platelet thrombus formation.
  • To focus on the structure-function relationships of key platelet adhesion receptors.

Main Methods:

  • Literature review of recent studies on platelet adhesion receptors.
  • Analysis of molecular mechanisms underlying platelet thrombus formation.
  • Focus on glycoprotein (GP)Ib-IX-V and GPVI function at high shear stress.

Main Results:

  • Platelet adhesion receptors, particularly GP Ib-IX-V and GPVI, are critical for initiating platelet adhesion and activation.
  • These receptors mediate platelet aggregation and thrombus formation under high shear stress conditions.
  • Advances in understanding structure-function relationships provide insights into thrombotic disease mechanisms.

Conclusions:

  • Understanding the molecular basis of platelet thrombus formation is essential for developing novel anti-thrombotic therapies.
  • GP Ib-IX-V and GPVI are crucial targets for therapeutic intervention in thrombotic disorders.
  • Platelet function extends beyond hemostasis, impacting vascular inflammation and atherogenesis.

Related Concept Videos

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...
Intracellular Signaling Affects Focal Adhesions01:17

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.
Some...
Selectins01:25

Selectins

Cell adhesion is  an essential aspect of multicellularity. While stable cell interactions usually occur between cells of the same type, transient cell interactions occur between cells of different tissue types, such as between neutrophils and endothelial cells. Selectins are one class of cell adhesion molecules (CAMs) that bind carbohydrate ligands to form transient cell adhesion. They are rod-like proteins with a long extracellular part of variable length ending with the lectin domain, which...
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...
Anchoring Junctions01:03

Anchoring Junctions

Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
Adherens Junctions01:24

Adherens Junctions

Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
The endothelial cells...