IL-17A
Full name: Interleukin-17A
Aliases:1 IL17, CTLA8, IL-17, CTLA-8, and IL-17A
Size:2 35 kDa
Family:3 IL-17 family (IL-17A, IL-17B, IL-17C, IL-17D, IL-17E, and IL-17F)
Receptors:2 IL-17RA (= IL-17R)
Major cellular sources:2 Activated Th17 cells, CD8+ T cells, γ𝛿 T cells, NK cells, NKT cells, neutrophils, and ILCs
Major cellular targets:2,3 Epithelial/endothelial cells, fibroblasts, osteoblasts, monocytes, macrophages, B cells, T cells, myelomonocytic cells and marrow stromal cells, and chondrocytes
Disease states associated with:2 Rheumatoid arthritis, multiple sclerosis, psoriasis, inflammatory bowel disease, allergic asthma, atopic dermatitis, contact hypersensitivity, and graft-versus-host-disease
Major physiologic functions:
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IL-17A acts mainly on non-hematopoietic cells, particularly epithelial cells, and plays an active role in maintaining immunity at boundary tissues.3
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IL-17A acts on a variety of cells, which respond by upregulating the expression of pro-inflammatory cytokines, chemokines, metalloproteases, antimicrobial peptides, and remodeling proteins.1-3
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By inducing cells to produce chemokines, IL-17A attracts neutrophils to mediate defense against different pathogens.2
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IL-17A directly contributes to leukocyte migration and tissue remodeling by promoting the secretion of metalloproteases.3
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IL-17A also regulates the activities of NF-κB and mitogen-activated protein kinases and can stimulate the expression of IL-6 and cyclooxygenase-2 (PTGS2/COX-2), as well as enhance the production of nitric oxide.1
References:
- 1.
NCBI. Gene. IL17A interleukin 17A [Homo sapiens (human)]. www.ncbi.nlm.nih.gov/gene/3605. Accessed March 11, 2021.
- 2.
Akdis M, Aab A, Altunbulakli C, et al. J Allergy Clin Immunol. 2016;138:984-1010.
- 3.
Brembilla NC, Senra L, Boehncke W-H. Front Immunol. 2018;9:1682.