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Role of Zinc in Interleukin 2 (IL‐2)‐Mediated T‐Cell Activation

In a serum‐free culture containing no zinc, zinc enhanced the proliferation of T cells in response to interleukin 2 (lL‐2), and also the in vitro production of lL‐2 by T cells. Although the lymphocyte proliferation was partially inhibited by anti‐IL‐2 antibodies, it was completely inhibited by anti‐IL‐2 receptor (CD25) antibodies. A Scatchard plot analysis showed that zinc induced the expression of high‐affinity receptors for IL‐2 on lymphocytes. The results indicated that zinc may be essentially required for IL‐2‐mediated T‐cell activation.