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• W1979277488 abstract "Interleukins (IL-) 1 and 6 have been shown to represent accessory signals for T-cell activation. In the present study, we further examined the effects of both cytokines on accessory cell-depleted human T cells stimulated with phytohemagglutinin (PHA). The addition of IL-6 to the cultures resulted in T-cell proliferation; however, IL-1 was unable to support PHA-induced T-cell growth. The addition of IL-1 consistently induced a low level of IL-2 production and strongly enhanced T-cell proliferation in the presence of IL-6. Thus, the effect of IL-1 on T-cell growth becomes apparent only in the presence of IL-6. Blocking the IL-2-receptor (IL-2R) with the monoclonal antibodies anti-Tac and MikBêta 1 (directed to the alpha and bêta chains of the IL-2R, respectively) had no effect on PHA/IL-6-supported proliferation, but completely eliminated the growth-enhancing effect of IL-1. On the other hand, a neutralizing anti-IL-4-antiserum did not affect PHA/IL-6- or PHA/IL-6/IL-1-induced proliferation. Further experiments showed that IL-6 enhances T-cell responsiveness to IL-2, as evidenced by enhanced IL-2-induced proliferation. However, we could not find an effect of IL-6 on the expression of IL-2R as measured by staining with anti-Tac and with MikBêta 1 or by binding of (125I)-IL-2 to T cells. It can be concluded from these studies that IL-1 and IL-6 have different helper effects on PHA-induced T-cell activation. In the presence of PHA, IL-6 induces limited IL-2/IL-4-independent growth, and more importantly it renders T cells responsive to IL-2. IL-1 provides a signal leading to IL-2 production. The combination of IL-1 and IL-6 represents a synergistic helper signal, leading to an IL-2-dependent pathway of proliferation." @default.
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• W1979277488 date "1990-01-01" @default.
• W1979277488 modified "2023-09-30" @default.
• W1979277488 title "Accessory cell-derived helper signals in human T-cell activation with phytohemagglutinin: Induction of interleukin 2, responsiveness of interleukin 6, and production of interleukin 2 by interleukin 1" @default.
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• W1979277488 doi "https://doi.org/10.1016/1043-4666(90)90042-r" @default.
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