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Biochem Biophys Res Commun. 2008 May 23;370(1):154-8. doi: 10.1016/j.bbrc.2008.03.050. Epub 2008 Mar 18.

Ectodomain shedding of TNF-alpha is enhanced by nardilysin via activation of ADAM proteases.

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  • 1Department of Cardiovascular Medicine, Graduate School of Medicine, Kyoto University, 54 Shogoin-Kawahara-Cho, Sakyo-Ku, Kyoto 606-8507, Japan.

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.

[PubMed - indexed for MEDLINE]
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