Abstract
Mitogen-transformed human peripheral blood lymphocytes and tonsil blasts were examined by rosette formation to detect the presence of membrane-bound immunoglobulin (Ig) and surface receptors for fixed IgG and fixed C3. In addition, the capacity of these cells to rosette with sheep erythrocytes was evaluated as a reaction characteristic of T lymphocytes. In order for clear morphological recognition of the rosetting transformed lymphocytes and the rosetting tonsil blasts a cytocentrifuge technique was developed and used in conjunction with autoradiography and/or with Romanowsky stains. Using these techniques and the culture methods described in this paper phytohaemagglutinin, pokeweed mitogen, streptococcal filtrates and purified protein derivative stimulated predominantly T cells in the peripheral blood of man. A minority of the transformed cells in these mitogen-stimulated cultures (<24%) did rosette with B lymphocyte markers and presumably represent a B-cell response. No significant differences were found between the T- or B-cell specificity of the mitogens investigated. Lymphoid preparations from tonsils excised from normal donors with recurrent tonsillitis were found to contain 6–15% lymphoblasts and the large majority of these cells formed rosettes with the B-cell markers, less than 20% of these lymphoblasts formed spontaneous sheep erythrocyte rosettes. Using a mixed rosetting technique a small proportion (<5%) of PHA-transformed cells and tonsil lymphoblasts were found to have combined sheep Fc or combined sheep C3 receptors. The investigation of B- and T-lymphocyte surface markers on mitogentransformed lymphocytes was extended to neoplastic lymphocyte populations and it was found that the majority of transformed cells (> 70%) present in chronic lymphocytic leukaemia cultures stimulated with PHA after 6 days incubation were transformed T lymphocytes.
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