Differential effects of glucocorticoids on the proliferation of a murine helper and a cytolytic T cell clone in response to IL-2 and IL-4.

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Abstract
The proliferation of murine T cell clones can be supported by IL-2 or by IL-4. We present here evidence that glucocorticosteroids differentially affect these two pathways of proliferation. Dexamethasone (DEX) and other corticosteroids were observed to induce autocrine proliferation of the D10.G4.1 Th cell clone (D10) in the presence of the anti-clonotypic antibody 3D3. This effect was inhibited by the anti-murine IL-4 antibody 11B11, indicating that it is mediated by IL-4. Furthermore, on this cell line, representative of the Th2 group of helper cells, DEX had little effect on the proliferation induced by exogenous IL-4 but completely inhibited the growth-promoting effects of IL-2. In contrast, the effects of DEX on the proliferation of the cytotoxic IL-2-dependent CTLL-2 cell line are completely opposite. DEX blocked the IL-4-driven proliferation of CTLL-2 cells, while leaving unaffected their response to IL-2. It is also shown in this study that the effects of glucocorticoids in this system are totally antagonized by the high affinity anti-glucocorticosteroid RU 38486, indicating that they are mediated through the described intracellular glucocorticoid receptor. These data suggest that the growth effects of IL-2 and IL-4 may be mediated by distinct pathways that are strikingly different in their sensitivity to glucocorticoids. In addition, the regulation of lymphokine-dependent proliferation and the response to glucocorticoids appeared very different in helper and cytotoxic cells.

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