From cytokine storm to renal scarring in diabetic kidney disease: Biomarkers, risk stratification, and precision therapeutics

Abstract

Diabetic kidney disease (DKD) remains a leading cause of chronic kidney disease (CKD) and end‐stage renal failure, with outcomes that often vary despite comparable metabolic control. Increasing evidence positions cytokine‐driven inflammation at the core of this heterogeneity, linking metabolic stress to progressive renal injury. In DKD, a sustained, dysregulated cytokine milieu—often conceptualized as a chronic “cytokine storm”—amplifies immune activation, disrupts glomerular integrity, and accelerates the transition from reversible injury to irreversible renal scarring. This narrative review synthesizes current clinical and translational evidence on the role of cytokines in DKD, focusing on their dual relevance as mechanistic drivers and actionable biomarkers. Key inflammatory mediators, including TNF‐α, IL‐6, IL‐1β, and TGF‐βs, are examined within the context of disease initiation, progression, and fibrosis. We highlight the growing utility of circulating and urinary cytokine profiles—particularly TNF receptor signatures—in early detection, prognostication, and risk stratification, offering advantages over conventional markers that often reflect late‐stage damage. Importantly, the paper explores how these insights are reshaping therapeutic strategies. Beyond established renoprotective agents such as SGLT2 and RAAS inhibitors, emerging targeted interventions aimed at cytokine signaling pathways hold promise for modifying disease trajectory. Integrating biomarker‐guided risk assessment with tailored anti‐inflammatory therapies represents a critical step toward precision medicine in DKD. Bridging molecular mechanisms with clinical application, this review underscores a paradigm shift from reactive management to proactive, individualized care—where early identification of inflammatory signatures may define the window to prevent progression from cytokine‐driven injury to permanent renal scarring.