Interleukins are a group of cytokines that were first seen to be expressed by leukocytes. The term interleukin describes a variety of polypeptides that act specifically as mediators between leucocytes. However, the name interleukin is something of a relic, since it has been found that interleukins are produced by a wide variety of body cells.

Sino Biological provides quality reagents for research on interleukins and their receptors, including: recombinant proteins, antibodies, ELISA kits, ORF cDNA clones, and more.

Quick Guide:

Interleukin Featured Fields

interleukin targeted therapy Targeted Therapy     interleukin immunotherapy Immunotherapy  
• IL1R1 • IL-4R • IL-2 • IL-7
• IL6R • IL-17A • IL-15 • IL-21
.... ....

Interleukin Products Highlights


Interleukin 1 is the first member of the IL-1 family which is closely linked to the innate immune response. IL-1 affects virtually all cells and organs and is a major pathogenic mediator of autoinflammatory, autoimmune, infectious, and degenerative diseases.


Interleukin 2, also known as T cell growth factor (TCGF), is produced by CD4+ T cells, CD8+ T cells, some B cells and dendritic cells. IL-2 exerts a wide spectrum of effects on the immune system, and it plays crucial roles in regulating both immune activation and homeostasis.


Interleukin 5 was described for the first time as an eosinophil and B-cell growth factor in 1987. In humans, IL-5 is a very selective cytokine as a result of the restricted expression of the interleukin-5 receptor on eosinophils and basophils.


Interleukin 6 is a cytokine not only involved in inflammation and infection responses but also in the regulation of metabolic, regenerative, and neural processes. In classic signaling, IL-6 stimulates target cells via a membrane bound IL-6 receptor, which upon ligand binding associates with the signaling receptor protein gp130.

IL-7 Receptor

IL-7 receptor (IL-7R), binding to its cognate ligand IL-7 (interleukin 7), activates multiple pathways that regulate lymphocyte survival, glucose uptake, proliferation and differentiation. IL-7 (interleukin 7) is an essential cytokine for the development and homeostatic maintenance of T and B lymphocytes.


Interleukin 10, first described in 1989 as cytokine synthesis inhibitory factor (CSIF), suppresses immune function by blocking the synthesis of proinflammatory cytokines (e.g., IL-1, IL-6, IFN-γ, and TNF-α) in T cells, monocytes, and macrophages, and by inhibiting the expression of cell surface molecules involved in antigen presentation and costimulation.


IL-12 (interleukin 12) was first described as natural killer stimulating factor in 1989. The heterodimeric cytokine IL-12 consists of a 35-kd light chain (p35 or IL-12A) and 40-kd heavy chain (p40 or IL-12B).


Interleukin 17 is secreted by a variety of innate cells including macrophages, dendritic cells (DC), natural killer, natural killer T, lymphoid tissue inducer and γδ-T cells. IL-17 exerts a host-defensive role in many infectious diseases, and it promotes inflammatory pathology in autoimmunity and other settings.

Interleukin Signaling Pathways

*Tips: You can click any green boxes in the following, and visit interleukin signaling pathways in detail.

IL-1 famiy signaling pathway Many cancers arise at sites of infection and inflammation. The IL-1 cytokine family consists of eleven members that play important roles in regulating inflammation.

IL-1 family cytokines activate intracellular signaling pathways by binding to a primary receptor subunit, such as IL-1 RI/IL-1 R1, IL-18 R alpha/IL-1 R5, IL-1 Rrp2/IL-1 R6, or ST2/IL-1 R4, which then recruits an accessory receptor to form the active receptor complex. Signaling cascades triggered by IL-1 alpha, IL-1 beta, IL-18, IL-33, IL-36 alpha, IL-36 beta, or IL-36 gamma activate MAPKs and NF-kappa B, leading to the expression of pro-inflammatory cytokines, chemokines, and secondary mediators of the inflammatory response.

Of note, most intracellular components that participate in the cellular response to IL-1 also mediate responses to other cytokines (IL-18 and IL-33), Toll-like-receptors (TLRs), and many forms of cytotoxic stresses.

Interleukin Categories