title: Determination of junction avidity of cytolytic T cell and target cell.
abstract: A direct measurement of the avidity of the junction between a cytotoxic T lymphocyte and its target cell was achieved by using a biophysical approach. A micromanipulation technique was used to determine the force required to separate a cytotoxic T cell (human clone F1, with specificity for HLA-DRw6) from its specific target cell (JY: HLA-A2, -B7, -DR4, w6) prior to delivery of the lethal hit. The force required to separate the F1-JY pair is 1.5 X 10(4) dynes per square centimeter. This junction avidity for F1-JY pairs is 6 to 13 times greater than that for F1-F1 and JY-JY pairs; the F1-JY conjugate requires a stronger separating force and is more easily rejoined than the homologous cell pairs. This study provides an estimate of the avidity of cytotoxic T cells for their target cells and insights into the biophysical correlates of the molecular complexes formed in the interaction of cytotoxic T cells and their targets during the cytotoxic process.
mesh_terms: D002450:Cell Communication; D003602:Cytotoxicity, Immunologic; D006684:HLA-DR Antigens / Q000276:immunology; D015808:HLA-DR6 Antigen; D006801:Humans; D008433:Mathematics; D013602:T-Lymphocytes, Cytotoxic / Q000166:cytology* / Q000276:immunology; D013997:Time Factors
chemical_list: D006684:HLA-DR Antigens; D015808:HLA-DR6 Antigen