title: Leukocyte-adherence inhibition: a specific assay of cell-mediated immunity dependent on lymphokine-mediated collaboration between T lymphocytes.
abstract: The leukocyte-adherence inhibition (LAI) assay was studied to determine its immunologic relevance and identify the cell populations on which it depends. Two systems were employed: peripheral blood leukocytes from humans immunized with KLH, and lymph node cells from rats immunized with DNP-BCG. In both cases, LAI responses appeared about 3 to 4 days after immunization, reached a peak about 3 to 4 weeks later, and diminished thereafter. Reimmunization resulted in a booster-like response. LAI analysis in both systems showed dose-response dependency. Responses could be elicited only with the immunizing antigen. Virtual depletion of phagocytic cells had no effect on the response. E-rosette-forming cells gave an excellent response to KLH and also produced an active supernatant (lymphokine). Cells not forming spontaneous E-rosettes were inactive and could not produce active supernatants. Only those nonimmune cells that formed E-rosettes could respond to active supernatants. Thus, the LAI response is a specific indicator of cell-mediated immunity. T lymphocytes probably are required both at the antigen-reactive stage and at the stage of responding to the T cell-dependent lymphokine.
mesh_terms: D000818:Animals; D004136:Dinitrobenzenes / Q000276:immunology; D004306:Dose-Response Relationship, Immunologic; D000939:Epitopes; D006433:Hemocyanins / Q000276:immunology; D006801:Humans; D007111:Immunity, Cellular; D007114:Immunization; D007957:Leukocyte Adherence Inhibition Test; D008222:Lymphokines / Q000276:immunology*; D051381:Rats; D011917:Rats, Inbred Lew; D013601:T-Lymphocytes / Q000276:immunology*; D013997:Time Factors; D005719:gamma-Globulins / Q000276:immunology
chemical_list: D004136:Dinitrobenzenes; D000939:Epitopes; D008222:Lymphokines; D005719:gamma-Globulins; D006433:Hemocyanins