IL-2作为一种T细胞生长因子在免疫应答及其调节中起重要作用,IL-2的拮抗剂可用于同种移植排斥、T细胞性白血病以及某些自身免疫性疾病的治疗.胞内IL-2的水平是反映Th1 /Th2型细胞平衡状态的一个有用指标,血清IL-2的水平异常增高与某些疾病密切相关. Interleukin 2 (IL2) is a secreted cytokine that is important for the proliferation of T and B lymphocytes. The receptor of this cytokine is a heterotrimeric protein complex whose gamma chain is also shared by interleukin 4 (IL4) and interleukin 7 (IL7). The expression of this gene in mature thymocytes is monoallelic, which represents an unusual regulatory mode for controlling the precise expression of a single gene. The targeted disruption of a similar gene in mice leads to ulcerative colitis like disease, which suggests an essential role of this gene in the immune response to antigenic stimuli. IL2 has been shown to have antitumor effects in some studies. This is probably mediated by cytotoxic effector cells. It produced by T-cells in response to antigenic or mitogenic stimulation, this protein is required for T-cell proliferation and other activities crucial to regulation of the immune response. Can stimulate B-cells, monocytes, lymphokine-activated killer cells, natural killer cells, and glioma cells. Belongs to the IL-2 family