A sodium-HIF1α axis coordinates immune metabolic reprogramming and mitochondrial remodeling in salt-sensitive...

Salt-sensitivity of blood pressure (SSBP) is associated with immune-metabolic dysfunction, yet the mechanism that coordinates sodium exposure, mitochondrial remodeling, and blood pressure response remains undefined. Phenome-wide and laboratory-value association studies (PheWAS and LabWAS) in the All of Us Research Program identified fluid, electrolyte, and acid-base balance disorders and renal phenotypes as the strongest disease associations. At the same time, hypertension was linked to reduced serum potassium, chloride, and eGFR, corroborating the centrality of renal-electrolyte physiology in blood pressure regulation. Using a within-subject sodium challenge in humans, we show that sodium loading reorganizes circulating tricarboxylic acid (TCA) cycle intermediates in proportion to the individual blood pressure response. Transcriptomic profiling of immune cells under high sodium revealed suppression of oxidative phosphorylation, induction of HIF1α-dependent glycolytic gene networks, and rebalancing of the pyruvate dehydrogenase complex. Single-cell chromatin accessibility profiling demonstrated that HIF1α motif activity in circulating immune cells correlates with changes in systolic blood pressure and pulse pressure in salt-sensitive individuals. High sodium induced mitochondrial fragmentation with increased organelle mass and glycolytic capacity. Pharmacological HIF1α inhibition reversed fragmentation while only partially normalizing metabolic output, indicating structural and metabolic remodeling are partially dissociable downstream of HIF1α. Renal HIF1α gain-of-function in mice recapitulated the glycolytic transcriptional response with medullary specificity. Concordantly, Drosophila melanogaster subjected to a high-salt diet exhibited impaired locomotor performance, mitochondrial dysmorphology, intestinal barrier disruption, and cardiac remodeling, establishing evolutionary conservation of sodium-induced end-organ dysfunction independent of an adaptive immune system. Together, these findings identify a HIF1α-dependent axis of mitochondrial metabolic adaptation providing a mechanistic basis for SSBP.