Redox-Mediated Mitochondrial Dysfunction as a Common Pathogenic Axis in Acute Kidney Injury and Chronic Kidney Disease

Acute kidney injury (AKI), chronic kidney disease (CKD), and diabetic kidney disease (DKD) are interconnected disorders linked by shared mechanisms involving redox imbalance and mitochondrial dysfunction. This review summarizes current evidence on the role of excessive reactive oxygen species (ROS) production, impaired oxidized nicotinamide adenine dinucleotide (NAD+) metabolism, altered mitochondrial bioenergetics, disrupted mitochondrial dynamics, and defective mitochondrial quality control pathways, including mitophagy and the mitochondrial unfolded protein response (UPRmt), in kidney disease progression. Experimental and clinical studies indicate that these mechanisms contribute to inflammation, fibrosis, apoptosis, and maladaptive repair, promoting progression from AKI to CKD and worsening DKD. The review also discusses emerging biomarkers and therapeutic strategies targeting oxidative stress and mitochondrial dysfunction. Overall, redox-mediated mitochondrial injury represents a shared pathogenic axis and a potential therapeutic target across kidney diseases.