The Pathophysiology and Vascular Complications of Diabetes in Chronic Kidney Disease: A Comprehensive Review

The coexistence of type 2 diabetes mellitus (T2DM) and chronic kidney disease (CKD) represents a significant global health challenge, contributing to substantial morbidity, mortality, and economic burden. T2DM is the leading cause of CKD, and CKD exacerbates diabetes-related complications, creating a bidirectional relationship driven by oxidative stress, inflammation, and endothelial dysfunction. Diabetic kidney disease (DKD), affecting some individuals with T2DM, accelerates progression to end-stage renal disease (ESRD) and increases cardiovascular mortality. Microvascular complications, including nephropathy, retinopathy, and neuropathy, and macrovascular complications, such as coronary artery disease and stroke, are prevalent in this population, further diminishing the quality of life. The pathophysiology underlying these complications is multifaceted. Hyperglycemia-induced oxidative stress and inflammation drive kidney damage and systemic vascular complications, while CKD alters glucose metabolism and antidiabetic drug pharmacokinetics. Endothelial dysfunction exacerbates vascular complications through impaired nitric oxide production and heightened thrombogenicity. Emerging insights into genetic and epigenetic mechanisms, including DNA methylation and mitochondrial dysfunction, have highlighted new therapeutic targets. Management strategies emphasize early screening, glycemic control, and a multidisciplinary approach integrating lifestyle modifications, pharmacotherapy, and patient education. Interventions targeting oxidative stress, inflammation, and endothelial dysfunction have shown promise in mitigating disease progression. Current evidence on the interconnected mechanisms driving DKD and associated vascular complications highlights the critical need for proactive, patient-centered management and further research into innovative diagnostic and therapeutic approaches to address this global health challenge.