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Related Experiment Video

Updated: Jul 10, 2026

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Published on: June 13, 2014

Memory in receptor-ligand-mediated cell adhesion.

Veronika I Zarnitsyna¹, Jun Huang, Fang Zhang

¹Coulter Department of Biomedical Engineering and Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0363, USA.

Proceedings of the National Academy of Sciences of the United States of America

|November 10, 2007

Summary

This summary is machine-generated.

Single-molecule assays often assume independent events, but this study found that receptor-ligand interactions can violate this, showing memory effects in cell adhesion and signaling.

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Last Updated: Jul 10, 2026

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Published on: June 13, 2014

Ligand Nano-cluster Arrays in a Supported Lipid Bilayer

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Adhesion Frequency Assay for In Situ Kinetics Analysis of Cross-Junctional Molecular Interactions at the Cell-Cell Interface

Adhesion Frequency Assay for In Situ Kinetics Analysis of Cross-Junctional Molecular Interactions at the Cell-Cell Interface

Published on: November 2, 2011

Area of Science:

Biophysics
Cell Biology
Biochemistry

Background:

Single-molecule biomechanical measurements are crucial for understanding molecular interactions.
These measurements often assume data are independent and identically distributed (i.i.d.), like a Bernoulli sequence.
This assumption is critical for accurate statistical analysis of stochastic biological processes.

Purpose of the Study:

To test the i.i.d. assumption in single-molecule biomechanical measurements.
To investigate whether sequential adhesion events exhibit memory effects.
To explore the implications of such memory effects for cell adhesion and signaling.

Main Methods:

Utilized the micropipette adhesion frequency assay to generate sequences of adhesion and non-adhesion events.
Analyzed the distributions of consecutive adhesion events.
Identified deviations from i.i.d. behavior, characterizing them as Markov sequences.

Main Results:

The i.i.d. assumption was violated in several receptor-ligand systems.
Observed positive feedback (increased adhesion probability after adhesion) for T cell receptor-MHC interactions.
Observed negative feedback (decreased adhesion probability after adhesion) for C-cadherin homotypic interactions.

Conclusions:

Sequential adhesion events are not always independent and identically distributed.
Receptor-ligand interactions can exhibit memory, influencing subsequent adhesion probabilities.
This 'memory' mechanism may play a role in cellular regulation of adhesion and signaling pathways.