From FLOW to translational positioning in chronic kidney disease: mechanistic complementarity of SGLT2 inhibitors and GLP-1 receptor agonists.

Chronic kidney disease is a central node of the cardio-kidney-metabolic continuum and carries substantial residual cardiovascular and kidney risk. Sodium-glucose cotransporter 2 inhibitors (SGLT2i) have reproducibly reduced kidney disease progression and heart failure risk in CKD outcomes trials, whereas GLP-1RAs have established cardiovascular benefit across cardiometabolic populations. The FLOW trial (Evaluate Renal Function With Semaglutide Once Weekly) established hard kidney-outcome evidence for semaglutide in type 2 diabetes with CKD, although whether this renal benefit represents a broader GLP-1RA class effect remains unresolved. This review synthesizes current evidence through a translational framework centered on mechanistic complementarity rather than simple add-on therapy. SGLT2 inhibitors predominantly provide proximal tubular and hemodynamic offloading, coupled with fasting-mimetic metabolic reprogramming that may improve oxygen-stress balance and cellular housekeeping. GLP-1RAs predominantly support an immune-vascular repair program by dampening sterile inflammation, preserving endothelial integrity, and limiting fibrotic amplification. These pathways appear to converge at mitochondrial homeostasis, autophagy, and barrier stability. We argue that the most useful clinical implication at present is not a fixed prescribing algorithm, but a phenotype-aware way to frame residual risk, sequence future studies, and define mechanistic endpoints for combination strategies across chronic kidney disease phenotypes.