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2016 ; 68
(5
): 1233-44
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Development of Th17-Associated Interstitial Kidney Inflammation in Lupus-Prone
Mice Lacking the Gene Encoding STAT-1
#MMPMID26636548
Yiu G
; Rasmussen TK
; Ajami B
; Haddon DJ
; Chu AD
; Tangsombatvisit S
; Haynes WA
; Diep V
; Steinman L
; Faix J
; Utz PJ
Arthritis Rheumatol
2016[May]; 68
(5
): 1233-44
PMID26636548
show ga
OBJECTIVE: Type I interferon (IFN) signaling is a central pathogenic pathway in
systemic lupus erythematosus (SLE), and therapeutics targeting type I IFN
signaling are in development. Multiple proteins with overlapping functions play a
role in IFN signaling, but the signaling events downstream of receptor engagement
are unclear. This study was undertaken to investigate the roles of the type I and
type II IFN signaling components IFN-?/?/? receptor 2 (IFNAR-2), IFN regulatory
factor 9 (IRF-9), and STAT-1 in a mouse model of SLE. METHODS: We used
immunohistochemical staining and highly multiplexed assays to characterize
pathologic changes in histology, autoantibody production, cytokine/chemokine
profiles, and STAT phosphorylation in order to investigate the individual roles
of IFNAR-2, IRF-9, and STAT-1 in MRL/lpr mice. RESULTS: We found that STAT-1(-/-)
mice, but not IRF-9(-/-) or IFNAR-2(-/-) mice, developed interstitial nephritis
characterized by infiltration with retinoic acid receptor-related orphan nuclear
receptor ?t-positive lymphocytes, macrophages, and eosinophils. Despite
pronounced interstitial kidney disease and abnormal kidney function, STAT-1(-/-)
mice had decreased proteinuria, glomerulonephritis, and autoantibody production.
Phosphospecific flow cytometry revealed shunting of STAT phosphorylation from
STAT-1 to STAT-3/4. CONCLUSION: We describe unique contributions of STAT-1 to
pathology in different kidney compartments in a mouse model, and provide
potentially novel insight into tubulointerstitial nephritis, a poorly understood
complication that predicts end-stage kidney disease in SLE patients.