IL-6
Full name: Interleukin-6
Aliases:1 Hepatocyte-stimulating factor, B-cell stimulatory factor 2, cytotoxic T-cell–differentiation factor, B-cell–differentiation factor, hybridoma/plasmacytoma growth factor, monocyte–granulocyte inducer type 2, and thrombopoietin
Size:1,2 19–26 kDa
Family:1,2 Main member of the IL-6 cytokine family that also includes leukemia inhibitor factor, ciliary neurotrophic factor, oncostatin M, IL-11, and cardiotrophin-1
Receptors:1,2 IL-6 receptor (membrane bound IL-6R and soluble sIL-6R) gp130
Major cellular sources:1,2 T cells, B cells, macrophages, monocytes, fibroblasts, chondrocytes, osteoblasts, mast cells, keratinocytes, and endothelial cells
Major cellular targets:2 T cells, B cells, hepatocytes, leukocytes, and hematopoietic cells
Disease states associated with:1,2 Immune diseases, inflammation, and autoimmune diseases
Major physiologic functions:
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IL-6 is involved in B-cell differentiation and survival, T-cell proliferation, development of osteoclasts in bone resorption, synovial fibroblast proliferation, and cartilage degradation.2
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IL-6 is responsible for acute phase proteins synthesis and neutrophil production in the bone marrow.2,3
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IL-6 induces direct stimulation of CRP from hepatocytes and plays a significant role in rheumatoid arthritis pathogenesis.1
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Allergen-induced IL-6 promotes type 2 and type 17 airway inflammation.2
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Chronic psoriatic lesions may produce large amounts of IL-6 and other pro-inflammatory cytokines, which release free fatty acids, cholesterol, and triglycerides from the adipose tissue. Consequently, patients with psoriasis have increased serum concentrations of triglycerides, total cholesterol, LDL-C, and VLDL-C.4
References:
- 1.
Srirangan S, Choy EH. Ther Adv Musculoskelet Dis. 2010;2:247‐256.
- 2.
Akdis M, Aab A, Altunbulakli C, et al. J Allergy Clin Immunol. 2016;138:984-1010.
- 3.
Wright HL, Cross AL, Edwards SW, Moots RJ. Rheumatology (Oxford). 2014;53:1321-1331.
- 4.
Pietrzak A, Chabros P, Grywalska E, et al. Postepy Dermatol Alergol. 2020;37:41-45.