Synchronized renal tubular cell death involves ferroptosis

Area of Science:

• Nephrology
• Cell Death Pathways
• Biomedical Research

Background:

• Receptor-interacting protein kinase 3 (RIPK3)-mediated necroptosis was considered the primary cause of regulated necrosis in ischemia-reperfusion injury (IRI).
• Loss of Fas-associated protein with death domain (FADD) or caspase-8 typically sensitizes tissues to necroptosis.

Purpose of the Study:

• To investigate the role of necroptosis and ferroptosis in renal tubule injury.
• To develop and evaluate a novel ferroptosis inhibitor for treating acute kidney injury.

Main Methods:

• Genetic ablation of FADD or caspase-8 in renal tubules.
• Hypoxic injury models and intravital microscopy.
• In vivo testing of a novel ferrostatin (16-86) in murine IRI models.

Main Results:

• Renal tubules are not sensitized to necroptosis by FADD or caspase-8 ablation.
• Iron-dependent ferroptosis directly causes synchronized renal tubule necrosis in IRI and oxalate crystal-induced acute kidney injury.
• The novel ferrostatin 16-86 demonstrated superior stability and potency, providing significant protection in severe IRI models.
• 16-86 enhanced protective effects of combination therapies.

Conclusions:

• Ferroptosis, not necroptosis, is the key pathway driving renal tubule necrosis in IRI and toxic kidney injury.
• The novel ferrostatin 16-86 offers a promising therapeutic strategy for acute kidney injury.
• Targeting ferroptosis represents a viable therapeutic approach for renal necrosis.