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Related Concept Videos

Fibril-associated Collagen01:11

Fibril-associated Collagen

Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
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Intracellular Signaling Affects Focal Adhesions01:17

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Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells
10:10

Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells

Published on: October 27, 2009

Collagen binding induces changes in its platelet integrin receptor alpha2beta1.

N Gofer-Dadosh1, A Klepfish, H Schmilowitz

  • 1Hemostasis Research Laboraoty, Instiute of Hematology, Rabin Medical Center, Beilinson Campus, Petah Tiqva, Israel.

Platelets
|June 24, 2006
PubMed
Summary

Platelet alpha2beta1 integrins exhibit increased affinity for collagen upon ligand binding, mediated by a newly formed intrareceptor disulfide bond. This high-affinity state is crucial for platelet-collagen interactions.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Integrin Signaling

Background:

  • Integrins mediate cell adhesion by binding ligands, undergoing conformational changes.
  • Ligand binding is hypothesized to alter integrin affinity for its ligand.

Purpose of the Study:

  • To investigate ligand-induced affinity changes in platelet alpha2beta1 integrin binding to collagen.
  • To identify the molecular mechanisms underlying high-affinity integrin-ligand interactions.

Main Methods:

  • Passaging labeled platelets through fibrillar collagen columns.
  • Elution of high-affinity receptors using dithiothreitol (DTT) and Sodium dodecyl sulfate (SDS).
  • Western-blotting to identify eluted alpha2beta1 integrins and functional assays with specific antibodies.

Main Results:

  • A high-affinity fraction of alpha2beta1 integrin was eluted from collagen using DTT and SDS.
  • Antibodies against this fraction inhibited collagen-specific platelet adhesion and aggregation.
  • Elution required DTT followed by acetic acid, suggesting disulfide bond reduction and electrostatic interaction disruption.

Conclusions:

  • Ligand binding induces the formation of an intrareceptor disulfide bond in a fraction of alpha2beta1 integrin.
  • This disulfide bond increases the affinity of alpha2beta1 integrin for collagen.
  • The findings reveal a novel mechanism for regulating integrin affinity and platelet-collagen interactions.