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Fu, Jia; Wang, Zichen; Lee, Kyung; Wei, Chengguo; Liu, Zhengzhao; Zhang, Mingchao; Zhou, Minlin; Cai, Minchao; Zhang, Weijia; Chuang, Peter Y.; Ma’ayan, Avi; He, John Cijiang; Liu, Zhihong
Kidney international, February 2018, 2018-02-00, 20180201, Volume: 93, Issue: 2Journal Article
A recent clinical study showed that combination therapy consisting of mycophenolate mofetil, tacrolimus and steroids was shown to be more effective in achieving complete remission in patients with severe forms of lupus nephritis than conventional therapy consisting of intravenous cyclophosphamide and steroids. To explore the underlying molecular and cellular mechanisms of increased efficacy of the combination therapy regimen, we employed a mouse model of lupus nephritis, MRL/lpr mice, and treated them with monotherapies of prednisone, mycophenolate mofetil, or tacrolimus, or with their combination. Consistent with previous clinical findings, combination therapy markedly improved renal outcome compared to the monotherapies in mice with lupus nephritis. Transcriptomic analysis of their kidneys revealed distinct molecular pathways that were differentially regulated in combination therapy versus monotherapies. Combination therapy not only provided additive immunosuppressive effects, but also induced gene expression and molecular pathways to confer enhanced renoprotection. Specifically, combination therapy inhibited TLR7 expression in the kidneys of mice with lupus nephritis; combination of tacrolimus and mycophenolate mofetil led to better stabilization of the podocyte actin cytoskeleton through the reciprocal regulation of RhoA and Rac1 activities. Combination therapy strongly suppressed the IL-6/Stat3 pathway. These findings were further validated in renal biopsy samples from patients with lupus nephritis before and after treatments with mycophenolate mofetil, tacrolimus or combination therapy. Thus, our study further supports the earlier clinical finding and further provides insights into the molecular basis for increased efficacy of combination therapy.
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