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Immunohorizons. 2017 Sep;1(7):133-141. doi: 10.4049/immunohorizons.1700035.

Interleukin-17 signaling triggers degradation of the constitutive NF-κB inhibitor ABIN-1.

Author information

1
Division of Rheumatology and Clinical Immunology, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA.
2
VIB-UGent Center for Inflammation Research, Zwijnaarde, Ghent 9052, Belgium, and the Department of Biomedical Molecular Biology, Ghent University, Zwijnaarde, Ghent 9052, Belgium.
3
Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA.
4
Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, Storrs, Connecticut 06269, USA.
5
Department of Medicine, University of California, San Francisco, California 94143-0358, USA.

Abstract

IL-17 activates NF-κB and inducing expression of proinflammatory genes. IL-17 drives disease in autoimmune conditions, and anti-IL-17 antibodies have shown impressive success in the clinic. Although produced by lymphocytes, IL-17 predominantly signals in fibroblasts and epithelial cells. IL-17-driven inflammation is kept in check by negative feedback signaling molecules, including the ubiquitin editing enzyme A20, whose gene TNFΑIP3 is and similarly linked to autoimmune disease susceptibility. Accordingly, we hypothesized that ABIN-1 might play a role in negatively regulating IL-17 signaling activity. Indeed, ABIN-1 enhanced both tonic and IL-17-dependent NF-κB signaling in IL-17-responsive fibroblast cells. Interestingly, the inhibitory activities of ABIN-1 on IL-17 signaling were independent of A20. ABIN-1 is a known NF-κB target gene, and we found that IL-17-induced activation of NF-κB led to enhanced ABIN-1 mRNA expression and promoter activity. Surprisingly, however, the ABIN-1 protein was inducibly degraded following IL-17 signaling in a proteasome-dependent manner. Thus, ABIN-1, acting independently of A20, restricts both baseline and IL-17-induced inflammatory gene expression. We conclude that IL-17-induced signals lead to degradation of ABIN-1, thereby releasing a constitutive cellular brake on NF-κB activation.

Conflict of interest statement

Conflict of Interest Statement: SLG has received research grants from Novartis and Janssen, and expects to receive consulting fees in excess of $5,000 from Lycera. There are no other conflicts of interest.

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