1. 重组蛋白
  2. Cytokines and Growth Factors
  3. Interleukin & Receptors
  4. IL-12 Receptor

IL-12 Receptor  (白介素-12 受体)

IL-12 受体是一种I型细胞因子受体,与 IL-12 结合。主要在 NK 和 T 细胞上表达,由 beta 1 和 beta 2 亚基组成,是 gp130 细胞因子受体超家族的成员。IL-12R 与其配体 IL-12 结合后,可以激活一系列的信号通路。其中,IL-12Rβ1 与酪氨酸激酶2(Tyk2)结合,而 IL-12Rβ2 与 Janus Kinase 2(JAK2)结合。而Tyk2 和 JAK2 主要在信号转导器和转录激活剂4(STAT4)上磷酸化酪氨酸残基。最终,STAT4 复合物定位到细胞核并与 IFNγ 启动子结合,于此同时,Jun 癌基因(c-Jun)也通过STAT4 被募集到IFNγ启动子中,增强 IFNγ 转录和 Th1 分化。IL-12R 介导的信号通路也因此与 IFN-γ 相关的自身免疫性炎症性疾病,如胶原蛋白诱导的关节炎(CIA)和结肠炎等息息相关[1][2]

The IL-12 receptor is a type I cytokine receptor that binds to IL-12. It is mainly expressed on NK and T cells, consists of beta 1 and beta 2 subunits, and is a member of the gp130 cytokine receptor superfamily. IL-12R, when bound to its ligand IL-12, activates a series of signaling pathways. Among them, IL-12Rβ1 binds to tyrosine kinase 2 (Tyk2), while IL-12Rβ2 binds to Janus Kinase 2 (JAK2). In contrast, Tyk2 and JAK2 phosphorylate tyrosine residues mainly on signal transducer and activator of transcription 4 (STAT4). Eventually, the STAT4 complex localizes to the nucleus and binds to the IFNγ promoter, while the Jun oncogene (c-Jun) is recruited to the IFNγ promoter via STAT4, enhancing IFNγ transcription and Th1 differentiation. The IL-12R-mediated signaling pathway is thus also relevant to IFN-γ-associated autoimmune inflammatory diseases such as collagen-induced arthritis (CIA) and colitis[1][2].

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