It has recently been demonstrated that IL-4 inhibits IL-2 receptor expression on T cells. Studies have also shown that IL-4 can inhibit IL-2-induced natural killer cell (NK) cytotoxicity, and that IL-4 in combination with IL-2 and large granular lymphocyte (NK/LGL) cells suppresses Ig synthesis. Therefore, we examine whether IL-2 receptor expression on NK/LGL cells is affected with or without IL-4, using fluorescent receptor analysis. Our results demonstrate that IL-4 inhibits/down-regulates the expression of IL-2 receptors on either phyto-hemagglutinin or IL-2-stimulated NK/LGL cells.

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