ADAM metallopeptidase domain 17 (ADAM17), also called TACE (tumor necrosis factor-α-converting enzyme), is a 70-kDa enzyme that belongs to the ADAM protein family of disintegrins and metalloproteases.
ADAM17 is understood to be involved in the processing of tumor necrosis factor alpha (TNF-α) at the surface of the cell, and from within the intracellular membranes of the trans-Golgi network. This process, which is also known as 'shedding', involves the cleavage and release of a soluble ectodomain from membrane-bound pro-proteins (such as pro-TNF-α), and is of known physiological importance. ADAM17 was the first 'sheddase' to be identified, and is also understood to play a role in the release of a diverse variety of membrane-anchored cytokines, cell adhesion molecules, receptors, ligands, and enzymes.
Cloning of the TNF-α gene revealed it to encode a 26 kDa type II transmembrane pro-polypeptide that becomes inserted into the cell membrane during its maturation. At the cell surface, pro-TNF-α is biologically active, and is able to induce immune responses via juxtacrine intercellular signaling. However, pro-TNF-α can undergo a proteolytic cleavage at its Ala76-Val77 amide bond, which releases a soluble 17kDa extracellular domain (ectodomain) from the pro-TNF-α molecule. This soluble ectodomain is the cytokine commonly known as TNF-α, which is of pivotal importance in paracrine signaling. This proteolytic liberation of soluble TNF-α is catalyzed by ADAM17.
Recently, ADAM17 was discovered as a crucial mediator of resistance to radiotherapy. Radiotherapy can induce a dose-dependent increase of furin-mediated cleavage of the ADAM17 proform to active ADAM17, which results in enhanced ADAM17 activity in vitro and in vivo. It was also shown that radiotherapy activates ADAM17 in non-small cell lung cancer, which results in shedding of multiple survival factors, growth factor pathway activation, and radiotherapy-induced treatment resistance. [3]
ADAM17 may play a prominent role in the Notch signaling pathway, during the proteolytic release of the Notch intracellular domain (from the Notch1 receptor) that occurs following ligand binding. ADAM17 also regulates the MAP kinase signaling pathway by regulating shedding of the EGFR ligand amphiregulin in the mammary gland.[4] ADAM17 also has a role in the shedding of L-selectin, a cellular adhesion molecule.[5]
The localization of ADAM17 is speculated to be an important determinant of shedding activity. TNF-α processing has classically been understood to occur in the trans-Golgi network, and be closely connected to transport of soluble TNF-α to the cell surface. However, research that suggests that the majority of mature, endogenous ADAM17 may be localized to a perinuclear compartment, with only a small amount of TACE being present on the cell surface. The localization of mature ADAM17 to a perinuclear compartment, therefore, raises the possibility that ADAM17-mediated ectodomain shedding may also occur in the intracellular environment, in contrast with the conventional model.
Functional ADAM17 has been documented to be ubiquitously expressed in the human colon, with increased activity in the colonic mucosa of patients with ulcerative colitis, a main form of inflammatory bowel disease. Other experiments have also suggested that expression of ADAM17 may be inhibited by ethanol.[10]
Male and female animals underwent a standardized phenotypic screen to determine the effects of deletion.[14][21] Twenty eight tests were carried out on mutant mice and two significant abnormalities were observed.[14] Few homozygousmutant embryos were identified during gestation. The remaining tests were carried out on heterozygous mutant adult mice; an increased bone mineral content was observed in these animals using Micro-CT.[14]
References
↑Black RA, Rauch CT, Kozlosky CJ, Peschon JJ, Slack JL, Wolfson MF, Castner BJ, Stocking KL, Reddy P, Srinivasan S, Nelson N, Boiani N, Schooley KA, Gerhart M, Davis R, Fitzner JN, Johnson RS, Paxton RJ, March CJ, Cerretti DP (February 1997). "A metalloproteinase disintegrin that releases tumour-necrosis factor-alpha from cells". Nature. 385 (6618): 729–33. doi:10.1038/385729a0. PMID9034190.
↑Moss ML, Jin SL, Milla ME, Bickett DM, Burkhart W, Carter HL, Chen WJ, Clay WC, Didsbury JR, Hassler D, Hoffman CR, Kost TA, Lambert MH, Leesnitzer MA, McCauley P, McGeehan G, Mitchell J, Moyer M, Pahel G, Rocque W, Overton LK, Schoenen F, Seaton T, Su JL, Becherer JD (February 1997). "Cloning of a disintegrin metalloproteinase that processes precursor tumour-necrosis factor-alpha". Nature. 385 (6618): 733–6. doi:10.1038/385733a0. PMID9034191.
↑Sharma A, Bender S, Zimmermann M, Riesterer O, Broggini-Tenzer A, Pruschy MN (September 2016). "Secretome Signature Identifies ADAM17 as Novel Target for Radiosensitization of Non-Small Cell Lung Cancer". Clinical Cancer Research. 22 (17): 4428–39. doi:10.1158/1078-0432.CCR-15-2449. PMID27076628.
↑Peiretti F, Deprez-Beauclair P, Bonardo B, Aubert H, Juhan-Vague I, Nalbone G (May 2003). "Identification of SAP97 as an intracellular binding partner of TACE". Journal of Cell Science. 116 (Pt 10): 1949–57. doi:10.1242/jcs.00415. PMID12668732.
↑Poghosyan Z, Robbins SM, Houslay MD, Webster A, Murphy G, Edwards DR (February 2002). "Phosphorylation-dependent interactions between ADAM15 cytoplasmic domain and Src family protein-tyrosine kinases". The Journal of Biological Chemistry. 277 (7): 4999–5007. doi:10.1074/jbc.M107430200. PMID11741929.
↑Taïeb J, Delarche C, Ethuin F, Selloum S, Poynard T, Gougerot-Pocidalo MA, Chollet-Martin S (December 2002). "Ethanol-induced inhibition of cytokine release and protein degranulation in human neutrophils". Journal of Leukocyte Biology. 72 (6): 1142–7. PMID12488495.
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