alexa Innate IL-17A-producing leukocytes promote acute kidney injury via inflammasome and Toll-like receptor activation.
Pharmaceutical Sciences

Pharmaceutical Sciences

Journal of Clinical & Experimental Pharmacology

Author(s): Chan AJ, Alikhan MA, Odobasic D, Gan PY, Khouri MB,

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Abstract In acute kidney injury, which is a significant cause of morbidity and mortality, cytokines and leukocytes promote inflammation and injury. We examined the pathogenic role of IL-17A in cisplatin-induced acute kidney injury. Intrarenal IL-17A mRNA transcription and protein expression were increased in wild-type mice after cisplatin-induced renal injury. An important role for IL-17A in the nephrotoxicity of cisplatin was demonstrated by observing protection from cisplatin-induced functional and histological renal injury in Il17a(-/-) and Rorγt(-/-) mice, as well as in mice treated pre-emptively with anti-IL-17A antibodies. Both renal injury and renal IL-1β and IL-17A production were attenuated in Asc(-/-) and Tlr2(-/-) mice, suggesting that cisplatin induces endogenous TLR2 ligand production and activates the ASC-dependent inflammasome complex, resulting in IL-1β and injurious IL-17A production. Neutrophils and natural killer cells are the likely targets of these pathways, because combined depletion of these cells was strongly protective; anti-IL-17A antibodies had no additional effect in this setting. Although IL-17A can also be produced by CD4(+) and γδ T cells, IL-17A from those cells does not contribute to renal injury. Cisplatin-induced injury was unchanged in γδ T-cell-deficient mice, whereas Il17a(-/-) CD4(+) T cells induced similar injury as did wild-type CD4(+) T cells on transfer to cisplatin-injected Rag1(-/-) mice. These studies demonstrate an important role for TLR2, the ASC inflammasome, and IL-17A in innate leukocytes in cisplatin-induced renal injury. Copyright © 2014 American Society for Investigative Pathology. Published by Elsevier Inc. All rights reserved. This article was published in Am J Pathol and referenced in Journal of Clinical & Experimental Pharmacology

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