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Artificial Antigen Presenting Cell (aAPC) Mediated Activation and Expansion of Natural Killer T Cells
13:18

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A leukocyte integrin binding peptide from intercellular adhesion molecule-2 stimulates T cell adhesion and natural

R Li1, P Nortamo, C Kantor

  • 1Department of Biochemistry, University of Helsinki, Finland.

The Journal of Biological Chemistry
|October 15, 1993
PubMed

Insights

A novel peptide from ICAM-2 activates leukocyte adhesion and natural killer cell functions. This discovery reveals that ligand-derived peptides can up-regulate integrin avidity, impacting cell-mediated immunity.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Leukocyte adhesion is crucial for immune cell functions.
  • The binding mechanisms between leukocyte integrins and intercellular adhesion molecules (ICAMs) are not fully understood.
  • Integrins typically require activation for adhesion.

Purpose of the Study:

  • To investigate the role of specific peptides in leukocyte integrin activation.
  • To explore the impact of ICAM-2 derived peptides on natural killer (NK) cell activity.
  • To provide evidence for ligand-induced up-regulation of integrin avidity.

Main Methods:

  • Identification and synthesis of a peptide from ICAM-2.
  • Assays to measure leukocyte integrin binding and activation.
  • Assessment of NK cell binding and cytotoxicity.

Main Results:

  • A peptide derived from ICAM-2 was identified that binds to leukocyte integrins.
  • This peptide activates integrin-mediated adhesion.
  • The peptide significantly enhanced NK cell binding and cytotoxicity.

Conclusions:

  • Ligand-derived peptides can activate adhesion-dependent leukocyte functions.
  • Integrin-ligand interactions can up-regulate the avidity of leukocyte integrins.
  • This finding has implications for understanding and manipulating immune cell responses.

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