白细胞介素2(IL2),原名T细胞生长因子(TCGF),是在免疫应答中释放的一系列淋巴因子中的一个重要成分。最初人们将IL2仅与T细胞增殖联系在一起,现在已发现IL2直接或间接地在其他细胞的增殖和成熟中发挥作用,这些反应与IL2生成量和其受体表达数量呈定量相关。IL2是在T细胞对载有抗原的辅助细胞所提供的两种信号应答时释放出来的:第一信号为抗原,由主要组织相溶性抗原的蛋白质内含物递呈,第 Interleukin 2 (IL2), formerly known as T-cell growth factor (TCGF), is an important component of a series of lymphokines released during an immune response. Initially, IL2 was associated only with T cell proliferation. It has now been found that IL2 directly or indirectly plays a role in the proliferation and maturation of other cells, and these responses are quantitatively correlated with IL2 production and its receptor expression. IL2 is released when T cells respond to two signals provided by antigen-carrying helper cells: the first signal is an antigen presented by the protein content of the major histocompatibility antigen, the