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Integrins

Integrins

Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...

Structure and Function of Platelets

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...

Intracellular Signaling Affects Focal Adhesions

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...

Formation of the Platelet Plug

Formation of the Platelet Plug

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Activation of Integrins

Activation of Integrins

Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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Selectins

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...

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Related Experiment Video

Updated: Jun 21, 2026

An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers

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The structure and function of platelet integrins.

J S Bennett¹, B W Berger, P C Billings

¹Hematology-Oncology Division, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA. bennetts@mail.med.upenn.edu

Journal of Thrombosis and Haemostasis : JTH

|July 28, 2009

Summary

This summary is machine-generated.

Platelet integrins, particularly beta3 integrins like alphaIIbbeta3, are crucial for cell adhesion and aggregation. Tight regulation prevents blood clot formation, highlighting their importance in hemostasis.

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Last Updated: Jun 21, 2026

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Published on: November 8, 2024

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Area of Science:

Biochemistry
Cell Biology
Hematology

Background:

Integrins are transmembrane heterodimers that link extracellular matrix to intracellular signaling.
Platelets express five integrins, including beta1 and beta3 subtypes.
Beta3 integrins, specifically alphavbeta3 and alphaIIbbeta3, play key roles in platelet function.

Purpose of the Study:

To review the structure and function of beta3 integrins in platelets.
To highlight the role of alphaIIbbeta3 in platelet aggregation.
To discuss the regulation of integrin activity in preventing thrombosis.

Main Methods:

Literature review focusing on beta3 integrins.
Analysis of integrin structure and function.
Comparison of different platelet integrins.

Main Results:

Platelets contain beta1 and beta3 integrins, mediating adhesion and aggregation.
AlphaIIbbeta3 is highly abundant and binds fibrinogen, mediating aggregation.
Alphavbeta3 is less abundant but mediates adhesion to specific ligands.

Conclusions:

Beta3 integrins, especially alphaIIbbeta3, are central to platelet aggregation and hemostasis.
Regulation of integrin activity is critical for preventing pathological thrombus formation.
Further research is needed to understand alphavbeta3 function in vivo.