Abstract
7-thia-8-oxoguanosine (immunosine) is a guanosine analogue showing immunostimulatory activity on different components of the immune system, including B lymphocytes, natural killer cells and macrophages. However, little is known about its effect on T-cell functions. In this work it was demonstrated that immunosine at concentrations between 10 μM and 1 mM stimulated proliferation of rat thymocytes in vitro triggered by suboptimal concentrations of concanavalin A (Con A). The effect correlated with increased interleukin 2 (IL-2) production, upregulation of the IL-2 receptor α (IL-2Rα) expression and decreased apoptosis of thymocytes in comparison to the effect of Con A alone.
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