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IL-6 receptor blockade ameliorates diabetic nephropathy via inhibiting inflammasome in mice.
Metabolism: Clinical and Experimental 2018 June
BACKGROUND AND OBJECTIVE: Interleukin 6 (IL-6) has been identified as a key mediator in inflammation, immune responses and glucose metabolism. In this study, we assessed the effects of an IL-6 receptor antibody on diabetic nephropathy in a mouse model of type 2 diabetes mellitus.
METHODS: Twelve week old male db/db mice were treated with Tocilizumab (an IL-6 receptor antibody), normal IgG1 control antibody, insulin or normal saline for 12 weeks. Renal injury, inflammation and insulin resistance were assessed.
RESULTS: Db/db mice treated with Tocilizumab exhibited reduced proteinuria and glomerular mesangial matrix accumulation compared to db/db + IgG controls. Additionally, Tocilizumab suppressed inflammatory response, oxidative stress and the IL-6 signaling pathway in the diabetic kidneys. It is noteworthy that blockade of IL-6 receptor blunted the activation of NLRP3 inflammasome partly through inhibition of IL-17A. Furthermore, insulin resistance assessed by glucose tolerance test, was ameliorated by Tocilizumab treatment.
CONCLUSIONS: The protective effects of an IL-6 receptor blockade against diabetic renal injury may be due to decreased insulin resistance and inhibition of the inflammasome.
METHODS: Twelve week old male db/db mice were treated with Tocilizumab (an IL-6 receptor antibody), normal IgG1 control antibody, insulin or normal saline for 12 weeks. Renal injury, inflammation and insulin resistance were assessed.
RESULTS: Db/db mice treated with Tocilizumab exhibited reduced proteinuria and glomerular mesangial matrix accumulation compared to db/db + IgG controls. Additionally, Tocilizumab suppressed inflammatory response, oxidative stress and the IL-6 signaling pathway in the diabetic kidneys. It is noteworthy that blockade of IL-6 receptor blunted the activation of NLRP3 inflammasome partly through inhibition of IL-17A. Furthermore, insulin resistance assessed by glucose tolerance test, was ameliorated by Tocilizumab treatment.
CONCLUSIONS: The protective effects of an IL-6 receptor blockade against diabetic renal injury may be due to decreased insulin resistance and inhibition of the inflammasome.
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