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• W1499470103 abstract "The immunoregulatory functions of human T4 cell subpopulations defined by mAb to the CD45R molecule (2H4) were examined. Both CD45R- and CD45R+ T4 cells that had been treated with mitomycin C (CD45R- and CD45R+ T4-mito) provided help for the generation of Ig-secreting cells (ISC) in cultures stimulated by PWM or by immobilized mAb to CD3 (64.1). IL-2 enhanced the generation of ISC in PWM-stimulated cultures and in anti-CD3-stimulated cultures containing CD45R+ T4-mito. The generation of ISC was maximal in cultures containing anti-CD3-activated CD45R- T4-mito and was not increased by IL-2. By contrast, CD45R+ T4 cells that had not been treated with mitomycin C suppressed B cell responses in cultures stimulated with PWM or anti-CD3, whereas CD45R- T4 cells suppressed the generation of ISC only in cultures stimulated with anti-CD3. IL-2 enhanced suppression by anti-CD3, but not PWM, activated CD45R- T4 cells. Suppression by CD45R+ T4 cells was maximal and not increased by IL-2. CD45R+ T4-mito were more effective suppressor-inducers in PWM-stimulated cultures, promoting the differentiation of suppressor-effector cells from CD8+ T cells. However, both CD45R+ and CD45R- T4-mito exerted comparable suppressor-inducer function in anti-CD3-stimulated cultures. Moreover, in anti-CD3-stimulated cultures, T8 cells could function as both suppressor-effector cells and suppressor-inducer cells. One of the functions of suppressor-inducer cells in this system appeared to involve the production of IL-2. Thus, the addition of IL-2 facilitated the induction of suppressor-effector T8 cells by CD45R- T4-mito in PWM-stimulated cultures. Although IL-2 production by the T cell subsets varied widely depending on the nature of the stimulus, these differences could not entirely explain their capacity to function as helper cells, suppressor-effector cells or suppressor-inducer cells. These results indicate that both CD45R+ and CD45R- T4 cells can help or suppress B cell responses, as well as induce suppressor-effector T8 cells. Moreover, suppressor-inducer function of T cells is not limited to the T4 cell population, but rather can also be accomplished by T8 cells. The results indicate that both T4 cell subsets and T8 cells exert multiple regulatory effects on human B cell function, with the nature of the activating stimulus playing a major role in determining the functional capacity of various T cell subsets." @default.
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• W1499470103 date "1989-04-15" @default.
• W1499470103 modified "2023-10-12" @default.
• W1499470103 title "T cell regulation of human B cell proliferation and differentiation. Regulatory influences of CD45R+ and CD45R- T4 cell subsets." @default.
• W1499470103 doi "https://doi.org/10.4049/jimmunol.142.8.2597" @default.
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