iRhom2 promotes lupus nephritis through TNF-<strong>α</strong> and EGFR signaling
Abstract
Lupus nephritis (LN) often results in progressive renal dysfunction. The inactive rhomboid 2 (iRhom2) is a newly identified key regulator of A disintegrin and metalloprotease 17 (ADAM17), whose substrates, such as TNF-α and heparin-binding EGF (HB-EGF), have been implicated in the pathogenesis of chronic kidney diseases. Here, we demonstrate that deficiency of iRhom2 protects the lupus-prone Fcgr2b–/– mice from developing severe kidney damage without altering anti-double-stranded DNA (anti-dsDNA) Ab production by simultaneously blocking HB-EGF/EGFR and TNF-α signaling in the kidney tissues. Unbiased transcriptome profiling of kidneys and kidney macrophages revealed that TNF-α and HB-EGF/EGFR signaling pathways are highly upregulated in Fcgr2b–/– mice, alterations that were diminished in the absence of iRhom2. Pharmacological blockade of either TNF-α or EGFR signaling protected Fcgr2b–/– mice from severe renal damage. Finally, kidneys from LN patients showed increased iRhom2 and HB-EGF expression, with interstitial HB-EGF expression significantly associated with chronicity indices. Our data suggest that activation of iRhom2/ADAM17-dependent TNF-α and EGFR signaling plays a crucial role in mediating irreversible kidney damage in LN, thereby uncovering a target for selective and simultaneous dual inhibition of 2 major pathological pathways in the effector arm of the disease.
Acknowledgments
This work is supported by the Lupus Research Institute (to JES and CPB), NIH grant GM64750 (to CPB), and the Michael D. Lockshin Fellowship of the Barbara Volcker Center for Women and Rheumatic Disease at the Hospital for Special Surgery (to XQ). We thank Gang Lin (Weill Cornell Medical College), Frank Barrat (Hospital for Special Surgery), and Nike Claessen and Onno J. de Boer (Department of Pathology, Academic Medical Center, University of Amsterdam) for thoughtful suggestions and technical support for the project and Amgen Inc. for providing murine p75TNFR:Fc.
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Footnotes
Conflict of interest: The authors have declared that no conflict of interest exists.
Reference information: J Clin Invest. 2018;128(4):1397–1412.https://doi.org/10.1172/JCI97650.
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