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Functional characteristics of the intercellular adhesion molecule-1 (CD54) expressed on cytotoxic human blood

P Wang1, F Vánky, S L Li

  • 1Department of Tumor Biology, Karolinska Institute, Stockholm, Sweden.

Cellular Immunology
|December 1, 1990
PubMed

Insights

Intercellular adhesion molecule-1 (ICAM-1) on human lymphocytes drives natural cytotoxicity. Blocking ICAM-1 with antibodies inhibits this function, revealing its crucial role in immune cell interactions.

Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • Natural cytotoxic function is vital for immune surveillance.
  • Intercellular adhesion molecule-1 (ICAM-1), also known as CD54, is a cell surface protein involved in cell adhesion.
  • The specific role of ICAM-1 in lymphocyte-mediated cytotoxicity requires further elucidation.

Purpose of the Study:

  • To investigate the role of ICAM-1 (CD54) positive cells in the natural cytotoxic function of human blood lymphocytes.
  • To determine the mechanism by which ICAM-1 influences lymphocyte cytotoxicity.
  • To explore the interaction between ICAM-1 and LFA-1 in cytotoxic T lymphocyte (CTL) responses.

Main Methods:

  • Utilized anti-ICAM-1 (LB-2) monoclonal antibodies (mAb) to inhibit cytotoxicity.
  • Separated ICAM-1 positive (ICAM-1+) and negative (ICAM-1-) lymphocyte populations.
  • Assessed the cytotoxic potential of lymphocytes against various target cell lines.
  • Performed kinetic experiments to analyze the effects of mAb on lytic interactions.

Main Results:

  • ICAM-1+ cells were primarily responsible for natural lymphocyte cytotoxicity.
  • Inhibition of cytotoxicity was observed with anti-ICAM-1 mAb and removal of ICAM-1+ cells.
  • Separated ICAM-1- lymphocytes gained cytotoxic potential and ICAM-1 expression upon activation.
  • ICAM-1+ lymphocytes lysed both LFA-1 positive and negative targets, with LB-2 mAb inhibiting lysis of LFA-1- targets.
  • Kinetics experiments indicated ICAM-1 mAb influenced effector cell recycling/recruitment, not initial interaction.

Conclusions:

  • ICAM-1 plays a significant, previously unrecognized role in lymphocyte-mediated cytotoxicity.
  • Lymphocyte cytotoxic potential may be regulated by ICAM-1 and LFA-1 mediated cell-cell contacts.
  • Activation of lymphocytes against NK-sensitive targets enhances their cytotoxic potential.
  • The function of activated lymphocytes was not inhibited by anti-ICAM-1 mAb, suggesting distinct regulatory mechanisms in activated vs. resting cells.

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