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Updated: Aug 9, 2026

Bead Aggregation Assays for the Characterization of Putative Cell Adhesion Molecules
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A direct binding assay for the vascular cell adhesion molecule-1 (VCAM1) interaction with alpha 4 integrins

R R Lobb1, G Antognetti, R B Pepinsky

  • 1Biogen, Inc., Cambridge Center, MA 02142, USA.

Cell Adhesion and Communication
|December 1, 1995
PubMed

Insights

A new assay using VCAM-Ig-AP measures VCAM1 and alpha 4 integrin interactions. This method allows rapid evaluation of alpha 4 integrin inhibitors without adhesion assay complications.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Vascular cell adhesion molecule-1 (VCAM1) is an Ig superfamily member.
  • VCAM1 interacts with alpha 4 integrins (VLA4 and alpha 4 beta 7) on leukocytes.
  • These interactions are crucial for leukocyte trafficking and activation.

Purpose of the Study:

  • To develop a rapid and reproducible assay for VCAM1/alpha 4 integrin interactions.
  • To evaluate the effects of metal ions, antibodies, and cell types on this interaction.
  • To provide a system for evaluating alpha 4 integrin-directed inhibitors.

Main Methods:

  • Developed an alkaline phosphatase (AP)-coupled VCAM-Ig fusion protein (VCAM-Ig-AP).
  • Utilized a microtiter plate format to measure VCAM1 and alpha 4 integrin binding.
  • Assessed the impact of various modulators and cell types on the interaction.

Main Results:

  • The VCAM-Ig-AP assay is rapid and reproducible.
  • Demonstrated direct measurement of VCAM1/alpha 4 integrin interactions.
  • Showcased the assay's utility in evaluating inhibitors and modulators.

Conclusions:

  • The VCAM-Ig-AP assay is a valuable tool for studying VCAM1/alpha 4 integrin dynamics.
  • This assay system facilitates the screening of alpha 4 integrin inhibitors.
  • Offers a method to bypass post-ligand binding complexities found in adhesion assays.

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