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The Journal of Immunology, Vol 141, Issue 10 3249-3257, Copyright © 1988 by American Association of Immunologists
ARTICLES |
JA Byrne, JL Butler and MD Cooper
Division of Developmental and Clinical Immunology, University of Alabama, Birmingham 35294.
Most studies of the activation requirements for T cells have used either T cell lines or populations of normal T cells that consist of a mixture of virgin and Ag-primed T cells. These two subpopulations of T cells can now be distinguished in humans by their reactivity with mAb. The anti-CD45R antibody HB10 identifies virgin T cells (T degrees) that are non-reactive to recall Ag and relatively poor at providing help for B cell differentiation. Conversely, memory T cells (T') that can react to recall Ag and enhance Ig production are non-reactive with anti- CD45R, but can be identified with the UCHL1 antibody. We have used these antibodies to separate the T degrees and T' populations and examine their activation requirements. On activation CD45R+ cells rapidly began to lose the CD45R Ag and express the UCHL1 Ag in increased amounts, whereas the UCHL1+ cells retained this phenotype. Both populations responded to PHA in the presence of monocytes, but when triggered by an antibody to CD3 only the T' cells were induced to express IL-2R, produce IL-2, and to proliferate. The T degrees population of cells remained relatively quiescent by all of these parameters. However, anti-CD3 stimulation conditioned the T degrees cells for IL-2 responsiveness, inasmuch as the addition of rIL-2 resulted in significant IL-2R expression and proliferation. When the CD4+ T degrees and CD4+ T' subpopulations were isolated and examined in the same assays similar results were obtained. The data indicate that fundamental differences exist in the triggering requirements for T degrees and T' cells.
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