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Shao WH , Gamero AM , Zhen Y , Lobue MJ , Priest SO , Albandar HJ , Cohen PL
Stat1 Regulates Lupus-like Chronic Graft-versus-Host Disease Severity via Interactions with Stat3
J Immunol. 2015 Nov 1;195(9) :4136-43
PMID: 26392462    PMCID: PMC4610853    URL: http://www.ncbi.nlm.nih.gov/pubmed/26392462
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Systemic lupus erythematosus (SLE) is a complex multisystem autoimmune disease, characterized by a spectrum of autoantibodies that target multiple cellular components. Glomerulonephritis is a major cause of morbidity in patients with SLE. Little is known about the pathogenesis of SLE renal damage and compromised renal function. Activation of both Stat1 and Stat3 has been reported in lupus and lupus nephritis. The reciprocal activation of these two transcription factors may have a major impact on renal inflammation. To study the role of Stat1 in a lupus model, we induced lupus-like chronic graft-versus-host disease (cGVHD) in Stat1-knockout (KO) and wild-type (WT) mice by i.p. injection of class II-disparate bm12 splenocytes. WT recipients of these alloreactive cells developed anti-dsDNA autoantibodies starting at week 2 as expected, with a decline after week 4. In contrast, Stat1-KO hosts exhibited a prolonged and significant increase of anti-dsDNA autoantibody responses compared with WT mice (week 4 to week 8). Increased autoantibody titers were accompanied by increased proteinuria and mortality in the cGVHD host mice lacking Stat1. Further analysis revealed expression and activation of Stat3 in the glomeruli of Stat1-KO host mice but not WT mice with cGVHD. Glomerular Stat3 activity in the Stat1-KO mice was associated with increased IL-6 and IFN-gamma secretion and macrophage infiltration. Interactions between Stat1 and Stat3 thus appear to be crucial in determining the severity of lupus-like disease in the cGVHD model.
Shao, Wen-Hai Gamero, Ana M Zhen, Yuxuan Lobue, Monica J Priest, Stephen O Albandar, Hazem J Cohen, Philip L Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't J Immunol. 2015 Nov 1;195(9):4136-43. doi: 10.4049/jimmunol.1501353. Epub 2015 Sep 21.