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2016 ; 6
(ä): 26164
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Therapeutic Blockade of Immune Complex-Mediated Glomerulonephritis by Highly
Selective Inhibition of Bruton s Tyrosine Kinase
#MMPMID27192942
Chalmers SA
; Doerner J
; Bosanac T
; Khalil S
; Smith D
; Harcken C
; Dimock J
; Der E
; Herlitz L
; Webb D
; Seccareccia E
; Feng D
; Fine JS
; Ramanujam M
; Klein E
; Putterman C
Sci Rep
2016[May]; 6
(ä): 26164
PMID27192942
show ga
Lupus nephritis (LN) is a potentially dangerous end organ pathology that affects
upwards of 60% of lupus patients. Bruton's tyrosine kinase (BTK) is important for
B cell development, Fc receptor signaling, and macrophage polarization. In this
study, we investigated the effects of a novel, highly selective and potent BTK
inhibitor, BI-BTK-1, in an inducible model of LN in which mice receive
nephrotoxic serum (NTS) containing anti-glomerular antibodies. Mice were treated
once daily with vehicle alone or BI-BTK-1, either prophylactically or
therapeutically. When compared with control treated mice, NTS-challenged mice
treated prophylactically with BI-BTK-1 exhibited significantly attenuated kidney
disease, which was dose dependent. BI-BTK-1 treatment resulted in decreased
infiltrating IBA-1+ cells, as well as C3 deposition within the kidney. RT-PCR on
whole kidney RNA and serum profiling indicated that BTK inhibition significantly
decreased levels of LN-relevant inflammatory cytokines and chemokines. Renal RNA
expression profiling by RNA-seq revealed that BI-BTK-1 dramatically modulated
pathways related to inflammation and glomerular injury. Importantly, when
administered therapeutically, BI-BTK-1 reversed established proteinuria and
improved renal histopathology. Our results highlight the important role for BTK
in the pathogenesis of immune complex-mediated nephritis, and BTK inhibition as a
promising therapeutic target for LN.