RIPK3-MLKL-mediated necroinflammation contributes to AKI progression to CKD

Cell Death & Disease
Hui ChenYanfang Xu

Abstract

Necroptosis predominates functionally over apoptosis in the pathophysiology of renal ischemia-reperfusion injury (IRI). Inhibition of the core components of the necroptotic pathway-receptor-interacting protein kinase 1 (RIPK1), RIPK3 or mixed lineage kinase domain-like protein (MLKL) reduced renal injury after ischemia/reperfusion (IR). Necrosis can initiate inflammation, which enhances necrosis in a positive feedback loop, subsequently leading to triggering more inflammation, termed as necroinflammation. However, the mechanisms underlying necroinflammation driven by renal tubular cell necroptosis in progression of AKI to CKD are still largely unknown. Here we showed that the upregulated expression and interactions between RIPK3 and MLKL induced necroptosis of renal proximal tubular cells and contributed to NLRP3 inflammasome activation under the conditions of IRI. Gene deletion of Ripk3 or Mlkl ameliorated renal tubular cell necroptosis, macrophage infiltration and NLRP3 inflammasome activation with a reduction in caspase-1 activation and maturation of IL-1β, and then finally reduced interstitial fibrogenesis in the long term after IRI. Bone marrow chimeras confirmed that RIPK3-MLKL-dependent necroptosis is responsible for the...Continue Reading

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Mar 30, 2019·Current Opinion in Nephrology and Hypertension·Anna Zuk, Joseph V Bonventre
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Methods Mentioned

BETA
ELISA
transfection
immunoprecipitation
fluorescence microscopy
X-ray
electron microscopy
Fluorescence
protein assay
PCR

Software Mentioned

Image J

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