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Interleukin
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Interleukins are a group of cytokines (secreted signaling molecules) that were first seen to be expressed by white blood cells (leukocytes, hence the -leukin) as a means of communication (inter-). The name is something of a relic though (the term was coined by Dr. Paetkau, University of Victoria); it has since been found that interleukins are produced by a wide variety of body cells. The function of the immune system depends in a large part on interleukins, and rare deficiencies of a number of them have been described, all featuring autoimmune diseases or immune deficiency.

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Encyclopedia
Interleukins are a group of cytokines (secreted signaling molecules) that were first seen to be expressed by white blood cells (leukocytes, hence the -leukin) as a means of communication (inter-). The name is something of a relic though (the term was coined by Dr. Paetkau, University of Victoria); it has since been found that interleukins are produced by a wide variety of body cells. The function of the immune system depends in a large part on interleukins, and rare deficiencies of a number of them have been described, all featuring autoimmune diseases or immune deficiency. The majority of interleukins are synthesized by helper CD4+ T lymphocytes, as well as through monocytes, macrophages, and endothelial cells. They promote the development and differentiation of T, B, and hematopoietic cells.
List
A list of interleukins:
| Name | Source | Target receptors | Target cells | Function
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|rowspan=4| IL-1 | macrophages, B cells, monocytes , dendritic cells | CD121a/IL1R1, CD121b/IL1R2 | T helper cells | co-stimulation | | B cells | maturation & proliferation | | Nk cells | activation | | macrophages, endothelium, other | inflammation, small amounts induce acute phase reaction, large amounts induce fever
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| IL-2 | TH1-cells | CD25/IL2RA, CD122/IL2RB, CD132/IL2RG | activated T cells and B cells, NK cells, macrophages, oligodendrocytes | stimulates growth and differentiation of T cell response. Can be used in immunotherapy to treat cancer or suppressed for transplant patients.
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|rowspan=2| IL-3 | activated T helper cells, mast cells, NK cells, endothelium, eosinophils | CD123/IL3RA, CD131/IL3RB | hematopoietic stem cells | differentiation and proliferation of myeloid progenitor cells to e.g. erythrocytes, granulocytes | | mast cells | growth and histamine release | IL-4 > TH2-cells, just activated naive CD4+ cell, memory CD4+ cells, mast cells, macrophages | CD124/IL4R, CD132/IL2RG | activated B cells | proliferation and differentiation, IgG1 and IgE synthesis. Important role in allergic response (IgE) | | T cells | proliferation | | endothelium | -
|rowspan=2| IL-5 | TH2-cells, mast cells, eosinophils | CD125/IL5RA, CD131/IL3RB | eosinophils | production | | B cells | differentiation, IgA production
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|rowspan=4| IL-6 | macrophages, TH2-cells, B cells, astrocytes, endothelium | CD126/IL6RA, CD130/IR6RB | activated B cells | differentiation into plasma cells | | plasma cells | antibody secretion | | hematopoietic stem cells | differentiation | | T cells, others | induces acute phase reaction, hematopoiesis, differentiation, inflammation
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| IL-7 | bone marrow stromal cells and thymus stromal cells | CD127/IL7RA, CD132/IL2RG | pre/pro-B cell, pre/pro-T cell, NK cells | differentiation and proliferation of lymphoid progenitor cells, involved in B, T, and NK cell survival, development, and homeostasis, ↑proinflammatory cytokines
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| IL-8 | macrophages, lymphocytes, epithelial cells, endothelial cells | CXCR1/IL8RA, CXCR2/IL8RB/CD128 | neutrophils, basophils, lymphocytes | Neutrophil chemotaxis
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| IL-9 | Th2-cells, specifically by CD4+ helper cells | CD129/IL9R | T cells, B cells | Potentiates IgM, IgG, IgE, stimulates mast cells
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|rowspan=5| IL-10 | monocytes, TH2-cells, CD8+ T cells, mast cells, macrophages, B cell subset | CD210/IL10RA, CDW210B/IL10RB | macrophages | cytokine production | | B cells | - | mast cells | | | Th1 cells | inhibits Th1 cytokine production (IFN-?, TNF-ß, IL-2) | | Th2 cells | Stimulation | IL-11 >| bone marrow stroma | IL11RA | bone marrow stroma | acute phase protein production, osteoclast formation
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|rowspan=2| IL-12 | dendritic cells, B cells, T cells, macrophages | CD212/IL12RB1, IR12RB2 | activated T cells, | differentiation into Cytotoxic T cells with IL-2, ↑ IFN-?, TNF-a, ↓ IL-10 | | NK cells | ↑ IFN-?, TNF-a
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| IL-13 | activated TH2-cells, mast cells, NK cells | IL13R | TH2-cells, B cells, macrophages | Stimulates growth and differentiation of B-Cells (IgE), inhibits TH1-cells and the production of macrophage inflammatory cytokines (e.g. IL-1, IL-6), ↓ IL-8, IL-10, IL-12
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| IL-14 | T cells and certain malignant B cells | | activated B cells | controls the growth and proliferation of B cells, inhibits Ig secretion
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| IL-15 | mononuclear phagocytes (and some other cells), especially macrophages following infection by virus(es) | IL15RA | T cells, activated B cells | Induces production of Natural Killer Cells
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| IL-16 | lymphocytes, epithelial cells, eosinophils, CD8+ T cells | CD4 | CD4+ T cells | CD4+ chemoattractant
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| IL-17 | subsets of T cells | CDw217/IL17RA, IL17RB | epithelium, endothelium, other | osteoclastogenesis, angiogenesis, ↑ inflammatory cytokines
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| IL-18 | macrophages | CDw218a/IL18R1 | Th1 cells, NK cells | Induces production of IFN?, ↑ NK cell activity
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| IL-19 | - | IL20R | | -
| IL-20 | - | IL20R | | regulates proliferation and differentiation of keratinocytes
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| IL-21 | activated T helper cells, NKT cells | IL21R | All lymphocytes, dendritic cells | -
| IL-22 | - | IL22R | | Activates STAT1 and STAT3 and increases production of acute phase proteins such as serum amyloid A, Alpha 1-antichymotrypsin and haptoglobin in hepatoma cell lines
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| IL-23 | - | IL23R | | Increases angiogenesis but reduces CD8 T-cell infiltration
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| IL-24 | - | IL20R | | Plays important roles in tumor suppression, wound healing and psoriasis by influencing cell survival.
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| IL-25 | - | LY6E | | Induces the production IL-4, IL-5 and IL-13, which stimulate eosinophil expansion
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| IL-26 | - | IL20R1 | | Enhances secretion of IL-10 and IL-8 and cell surface expression of CD54 on epithelial cells
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| IL-27 | - | IL27RA | | Regulates the activity of B lymphocyte and T lymphocytes
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| IL-28 | - | IL28R | | Plays a role in immune defense against viruses
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| IL-29 | - | | | Plays a role in host defenses against microbes
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| IL-30 | - | | | Forms one chain of IL-27
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| IL-31 | - | IL31RA | | May play a role in inflammation of the skin
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| IL-32 | - | | | Induces monocytes and macrophages to secrete TNF-a, IL-8 and CXCL2
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| IL-33 | - | | | Induces helper T cells to produce type 2 cytokine
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| IL-35 | regulatory T cells | | | Suppression of T helper cell activation |
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