title: Ectodomain shedding of TNF-alpha is enhanced by nardilysin via activation of ADAM proteases.
abstract: Tumor necrosis factor-alpha (TNF-alpha) is released from cells by proteolytic cleavage of a membrane-anchored precursor. The TNF-alpha-converting enzyme (TACE/ADAM17) is the major sheddase for ectodomain shedding of TNF-alpha. At present, however, it is poorly understood how its catalytic activity is regulated. Here, we show that nardilysin (N-arginine dibasic convertase; NRDc) enhanced TNF-alpha shedding. In a cell-based shedding assay, expression of NRDc synergistically enhanced TACE-induced TNF-alpha shedding. A peptide cleavage assay in vitro showed that recombinant NRDc enhances the cleavage of TNF-alpha induced by TACE. Notably, co-incubation of NRDc completely reversed the inhibitory effect of a physiological concentration of salt on TACE's activity in vitro. Overexpression of NRDc in TACE-deficient fibroblasts resulted in an increase in the amount of TNF-alpha released. Co-expression of NRDc with ADAM10 promoted the release compared with the sole expression of ADAM10. These results suggested that NRDc enhances TNF-alpha shedding through activation of not only TACE but ADAM10. Our results indicate the involvement of NRDc in ectodomain shedding of TNF-alpha, which may be a novel target for anti-inflammatory therapies.
authors: Department of Cardiovascular Medicine, Graduate School of Medicine, Kyoto University, 54 Shogoin-Kawahara-Cho, Sakyo-Ku, Kyoto 606-8507, Japan.
authors: Yoshinori
authors: Y
authors: Hiraoka
authors: Kazuhiro
authors: K
authors: Yoshida
authors: Mikiko
authors: M
authors: Ohno
authors: Tatsuhiko
authors: T
authors: Matsuoka
authors: Toru
authors: T
authors: Kita
authors: Eiichiro
authors: E
authors: Nishi
mesh_terms: D051722:ADAM Proteins / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000378:metabolism*; D000072197:ADAM10 Protein; D000072198:ADAM17 Protein; D053829:Amyloid Precursor Protein Secretases / Q000378:metabolism*; D000818:Animals; D019556:COS Cells; D002384:Catalysis; D002522:Chlorocebus aethiops; D004789:Enzyme Activation; D006801:Humans; D008565:Membrane Proteins / Q000378:metabolism*; D008666:Metalloendopeptidases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011493:Protein Kinase C / Q000378:metabolism; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012965:Sodium Chloride / Q000037:antagonists & inhibitors / Q000494:pharmacology; D014409:Tumor Necrosis Factor-alpha / Q000737:chemistry / Q000378:metabolism*
chemical_list: D008565:Membrane Proteins; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha; D012965:Sodium Chloride; D011493:Protein Kinase C; D053829:Amyloid Precursor Protein Secretases; D051722:ADAM Proteins; D008666:Metalloendopeptidases; C087976:nardilysin; D000072197:ADAM10 Protein; C491236:ADAM10 protein, human; D000072198:ADAM17 Protein; C000606462:ADAM17 protein, human