title: Colony formation by subpopulations of human T lymphocytes. V. Helper and suppressor activity of cloned human T-cell lines.
abstract: Twelve human T-cell lines were derived from cultures stimulated with phytohaemagglutinin (PHA) or with the recall antigen purified protein derivative (PPD), using the one-step agar colony method, followed by further expansion of individual T-cell colonies for at least 50 days. As judged by monoclonal antibodies, two of the PHA-derived T-cell lines carried the helper-inducer (H-I) phenotype and two the suppressor-cytotoxic (S-C) phenotype. Four PPD-derived cell lines displayed the H-I phenotype, and three of these proliferated specifically when challenged with the recall antigen, whereas the fourth did not. Four PPD-induced T-cell lines carried the S-C phenotype, and only one of these was antigen-specific. All cell lines with H-I phenotype displayed helper cell activity as determined by Ig secretion of B lymphocytes stimulated with a T-cell-dependent polyclonal B-cell activator. Cell lines with the S-C phenotype had no such helper activity and suppressed Ig responses in the presence of freshly isolated T cells. Thus, a good correlation between phenotypic markers and functions was found. T helper cells and T suppressor cells can be differentiated by means of both polyclonal and antigenic stimuli.
mesh_terms: D000921:Antibody-Producing Cells / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology; D002454:Cell Differentiation; D002460:Cell Line; D003114:Colony-Forming Units Assay; D006801:Humans; D008213:Lymphocyte Activation; D010641:Phenotype; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000145:classification / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000145:classification / Q000276:immunology*; D013745:Tetanus Toxoid / Q000494:pharmacology; D014373:Tuberculin / Q000276:immunology
chemical_list: D013745:Tetanus Toxoid; D014373:Tuberculin