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Related Experiment Videos

A ligand binding assay for E-selectin

M Anostario1, S H Li, K S Huang

  • 1Department of Inflammation/Autoimmuine Disease, Hoffmann-La Roche, Inc., Nutley, New Jersey 07110.

Analytical Biochemistry
|September 1, 1994
PubMed
Summary
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A new cell-free assay measures E-selectin binding to carcinoembryonic antigen (CEA) carrying sialyl Lewis x (sLex). This sensitive assay is useful for studying E-selectin interactions and screening for antagonists.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Immunology

Background:

  • E-selectin is a cell adhesion molecule involved in inflammatory responses.
  • Carcinoembryonic antigen (CEA) is a glycoprotein that can bind to E-selectin via its sialyl Lewis x (sLex) epitope.
  • Studying E-selectin-ligand interactions is crucial for understanding immune cell trafficking and developing therapeutics.

Purpose of the Study:

  • To develop and validate a novel cell-free ligand binding assay for E-selectin.
  • To characterize the specificity and requirements of the E-selectin/sLex interaction.
  • To assess the utility of the assay for screening antagonists and studying E-selectin function.

Main Methods:

  • Immobilization of soluble E-selectin onto microtiter plates.

Related Experiment Videos

  • Incubation with 125I-labeled CEA carrying sLex.
  • Elution of bound CEA using EDTA and monitoring by radioactivity.
  • Inhibition studies using anti-sLex and anti-E-selectin antibodies.
  • Assessment of Ca2+, pH, sialic acid, and protein denaturation effects on binding.

    • Main Results:

    • The assay demonstrated E-selectin/sLex-specific binding, confirmed by antibody inhibition.
    • Binding was dependent on Ca2+, optimal pH 7.0, and the presence of sialic acid.
    • Neuraminidase digestion of CEA abrogated binding.
    • Partial loss of binding upon protein denaturation suggested a role for protein conformation or carbohydrate orientation.
    • The assay showed high sensitivity with an IC50 of 1 mM for sLex.

    Conclusions:

    • A simple, sensitive, and specific cell-free assay for E-selectin ligand binding has been established.
    • The assay accurately reflects the known requirements for E-selectin/sLex interactions.
    • This assay is a valuable tool for screening potential antagonists and investigating E-selectin structure-function relationships.