Interleukin-12 pathway (IL-12 pathway)

The "Interleukin 12 pathway" refers to a **signaling cascade** mediated by the interleukin 12 (IL‑12) family of cytokines. This is not a single molecule or receptor but rather a collection of related cytokines—including IL‑12 itself as well as IL‑23, IL‑27, and IL‑35—that share structural features and often overlapping biological functions[1][2][3][5]. These cytokines are heterodimeric proteins composed of alpha and beta subunits; for example, **IL‑12 consists of p35 and p40 subunits**[1][7]. The primary function of the pathway is to regulate both innate and adaptive immune responses—most notably by promoting differentiation of naïve T cells into Th1 cells and enhancing cytotoxic activity in natural killer (NK) cells and CD8+ T lymphocytes[1][4][5]. The **IL‑12 family signaling pathways** play key roles in inflammatory diseases such as psoriasis, multiple sclerosis, rheumatoid arthritis, Crohn’s disease—and have been investigated for their involvement in cancer immunology due to their pro-inflammatory effects[2][5]. The receptors involved are also heterodimeric complexes; for instance, the canonical receptor for IL‑12 is composed of **IL‑12Rβ1 (CD212) and IL‑12Rβ2**, which are expressed on various immune cell types including T cells and NK cells[2][5]. Because this entry describes an entire *pathway* rather than a specific molecular target such as a receptor or enzyme—and because it encompasses several distinct molecules—it should not be considered a direct therapeutic target itself. Instead, individual components within this pathway (such as "Interleukin 12", "Interleukin 23", or their respective receptors) may serve as drug targets. If you require structured information about specific molecules within this pathway—such as "Interleukin 12" or "Interleukin 23 receptor"—please specify the exact molecule or protein.

Other names

IL-12 signaling pathwayInterleukin 12 family signalingIL-12/IL-23 axis