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- Title
Patients with Proliferative Lupus Nephritis Have Autoantibodies That React to Moesin and Demonstrate Increased Glomerular Moesin Expression.
- Authors
Caster, Dawn J.; Korte, Erik A.; Merchant, Michael L.; Klein, Jon B.; Barati, Michelle T.; Joglekar, Ami; Wilkey, Daniel W.; Coventry, Susan; Hata, Jessica; Rovin, Brad H.; Harley, John B.; Namjou-Khales, Bahram; McLeish, Kenneth R.; Powell, David W.; Del Vecchio, Lucia
- Abstract
Kidney involvement in systemic lupus erythematosus (SLE)—termed lupus nephritis (LN)—is a severe manifestation of SLE that can lead to end-stage kidney disease (ESKD). LN is characterized by immune complex deposition and inflammation in the glomerulus. We tested the hypothesis that autoantibodies targeting podocyte and glomerular cell proteins contribute to the development of immune complex formation in LN. We used Western blotting with SLE sera from patients with and without LN to identify target antigens in human glomerular and cultured human-derived podocyte membrane proteins. Using liquid chromatography-tandem mass spectrometry (LC-MS/MS), we identified the proteins in the gel regions corresponding to reactive bands observed with sera from LN patients. We identified 102 proteins that were present in both the podocyte and glomerular samples. We identified 10 high-probability candidates, including moesin, using bioinformatic analysis. Confirmation of moesin as a target antigen was conducted using immunohistochemical analysis (IHC) of kidney biopsy tissue and enzyme-linked immunosorbent assay (ELISA) to detect circulating antibodies. By IHC, biopsies from patients with proliferative lupus nephritis (PLN, class III/IV) demonstrated significantly increased glomerular expression of moesin (p < 0.01). By ELISA, patients with proliferative LN demonstrated significantly increased antibodies against moesin (p < 0.01). This suggests that moesin is a target glomerular antigen in lupus nephritis.
- Subjects
LUPUS nephritis; LIQUID chromatography-mass spectrometry; AUTOANTIBODIES; CHRONIC kidney failure; RENAL biopsy; SYSTEMIC lupus erythematosus
- Publication
Journal of Clinical Medicine, 2021, Vol 10, Issue 4, p793
- ISSN
2077-0383
- Publication type
Article
- DOI
10.3390/jcm10040793