Abstract
As a pleiotropic cytokine, interleukin (IL)-6 plays a key role in mediating the host’s immune defense. Multiple cell types are involved in IL-6 production, including macrophages, dendritic cells, fibroblasts, mast cells, vascular endothelial cells, monocytes, dendritic cells, T cells, B cells, etc. Furthermore, stromal cells, immune cells that infiltrate tumors, and cancer cells present in the tumor microenvironment are also in charge of producing IL-6. Although the blood levels of IL-6 are barely noticeable at physiological levels (1–5 pg/ml), they have been observed to increase by more than 100,000 times during an immediate inflammatory reaction. Elevated intensities of IL-6 have been identified in almost all human cancers. Overexpression of IL-6 in the tumor microenvironment stimulates carcinogenesis by controlling all the pathways that lead to cancer. There are two categories of interleukin-6 receptors: the first one comprises the cell membrane-bound receptor of IL-6 (IL-6R). Upon binding with IL-6R, IL-6 forms a complex with glycoprotein 130 (gp130) (a signal transducer), and, thus, the classical signaling pathway that exhibits anti-inflammatory activity gets activated. The second category comprises a soluble derivative of the interleukin-6 receptor, i.e., soluble IL-6R (sIL-6R). Upon IL-6 binding to sIL-6R, a membrane-associated signal transducer (gp130) complex is formed and trans-signaling gets activated. Signaling pathways, for instance, Ras/Raf/mitogen-activated protein kinase (MAPK), Janus kinase/signal transducer and activator of transcription (JAK/STAT), phosphatidylinositol-3 kinase (PI3K), or Src/yes-associated protein (Src/YAP), exhibit inflammatory activity, as a result of which they get activated. Almost all human malignancies are related to higher IL-6 levels in the blood. In this chapter we have summarized the function of interleukin-6 and its associated signaling pathways that promote cancer progression via various processes such as angiogenesis and increased expression of antiapoptotic genes known to promote cancer. Moreover, we have discussed the potential agents targeting IL-6R/IL-6/JAK/STAT3 that restores the anti-tumor activity by inhibiting IL-6/JAK/STAT3 axis.
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Mir, M.A., Bashir, M., Jan, N. (2023). The Role of Interleukin (IL)-6/IL-6 Receptor Axis in Cancer . In: Mir, M.A. (eds) Cytokine and Chemokine Networks in Cancer. Springer, Singapore. https://doi.org/10.1007/978-981-99-4657-0_5
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