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Related Experiment Videos

CD28:B7 interactions promote T cell adhesion

S M Turcovski-Corrales1, R G Fenton, G Peltz

  • 1Clinical Services Program, National Cancer Institute-Frederick Cancer Research and Development Center, MD 21702-1201, USA.

European Journal of Immunology
|November 1, 1995
PubMed
Summary
This summary is machine-generated.

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The natural ligand B7.1 enhances T cell adhesion to melanoma cells, mediated by specific cell interactions and intracellular signaling pathways. This finding suggests B7 expression promotes lymphocyte activation and migration.

Area of Science:

  • Immunology
  • Cell Biology
  • Cancer Research

Background:

  • CD28 co-stimulation is crucial for T cell activation.
  • Previous studies focused on antibody-mediated CD28 ligation.
  • The role of natural ligand B7.1 in T cell adhesion to other cells was unknown.

Purpose of the Study:

  • To investigate the effect of B7.1 ligation on T cell adhesion to melanoma cells.
  • To elucidate the molecular mechanisms underlying this adhesion.
  • To understand the signaling pathways involved in CD28-mediated T cell adhesion.

Main Methods:

  • Co-culture of human T cells with B7.1-transfected and untransfected melanoma cells.
  • Inhibition studies using anti-B7.1 antibodies and soluble CTLA-4 immunoglobulin.

Related Experiment Videos

  • Pharmacological inhibition of intracellular signaling pathways (PKC, PI3K).

    • Main Results:

    • Human T cells adhered to B7.1-transfected melanoma cells, but not parental cells.
    • Adhesion was rapid (within 15 min) and inhibited by anti-B7.1 and CTLA-4Ig.
    • Adhesion involved LFA-1:ICAM-1 and CD2:LFA-3 interactions.
    • Protein kinase C (PKC) signaling was required, but PI3K was not.

    Conclusions:

    • B7.1 ligation significantly enhances T cell adhesion to melanoma cells.
    • This adhesion is mediated by known T cell adhesion molecules and requires PKC signaling.
    • The presence of B7 on cells may promote lymphocyte activation, cytolysis, and migration.