Uromodulin Biology in Kidney Disease

Uromodulin, also known as Tamm-Horsfall protein, is the most abundant glycoprotein produced by the thick ascending limb of the loop of Henle. Synthesised as a precursor, it undergoes proteolytic cleavage and polymerisation before being secreted into the tubular lumen, where it contributes to ion transport, tubular defence and urine concentration. In hereditary conditions such as autosomal dominant tubulointerstitial kidney disease (ADTKD-UMOD), mutant uromodulin is retained in the endoplasmic reticulum of epithelial cells, triggering stress responses, tubular injury and progressive interstitial fibrosis. Beyond monogenic disorders, variations in the UMOD gene affect susceptibility to hypertension and chronic kidney disease in the general population by modulating uromodulin expression and trafficking. Circulating and urinary levels of uromodulin have emerged as indicators of tubular integrity, reflecting nephron mass and functional reserve. Recent advances in understanding the molecular pathways governing uromodulin synthesis, polymerisation and secretion have revealed potential therapeutic targets to restore normal trafficking and to mitigate downstream inflammatory and fibrotic cascades. Practical implications span early biomarker development in acute kidney injury, precision medicine approaches for antihypertensive therapy and novel strategies to enhance clearance of misfolded protein aggregates in genetic kidney disease.

Research from Nature Portfolio

Studies have elucidated the critical role of a membrane-bound serine protease in uromodulin activation and its impact on salt handling. In hepsin-deficient models, improper cleavage of uromodulin leads to its intracellular accumulation, heightened sodium cotransporter activity and altered salt sensitivity. At baseline, these animals exhibit positive sodium balance and resistance to dehydration, whereas under high salt intake they develop salt wasting, tubular endoplasmic reticulum stress and early signs of epithelial damage. These findings establish protease-mediated processing of uromodulin as a key modulator of thick ascending limb homeostasis and highlight potential avenues for correcting salt-sensitive blood pressure disturbances and preventing tubular injury.

Uromodulin Biology in Kidney Disease publication trend

The graph below shows the total number of articles in uromodulin biology in kidney disease across all publications each year (not limited to Nature Index journals).

Technical terms

Uromodulin: A glycoprotein produced exclusively by cells of the thick ascending limb, involved in ion transport, defence against pathogens and regulation of tubular function.

Thick ascending limb (TAL): A nephron segment responsible for reabsorption of sodium, potassium and chloride, critical for urine concentration and electrolyte balance.

Autosomal dominant tubulointerstitial kidney disease (ADTKD): A hereditary disorder characterised by progressive tubulointerstitial fibrosis and loss of renal function, often caused by UMOD gene mutations.

Endoplasmic reticulum stress: A cellular condition arising from accumulation of misfolded proteins in the endoplasmic reticulum, leading to activation of adaptive and inflammatory pathways.

Nephron: The functional unit of the kidney, comprising the glomerulus and tubular segments, responsible for urine formation and electrolyte homeostasis.

References

1. Disrupted uromodulin trafficking is rescued by targeting TMED cargo receptors. Journal of Clinical Investigation (2024).
2. Serum Uromodulin as early marker for ischemic acute kidney injury and nephron loss: association with kidney tissue distribution pattern. Journal of Translational Medicine (2025).
3. Allelic effects on uromodulin aggregates drive autosomal dominant tubulointerstitial kidney disease. EMBO Molecular Medicine (2023).
4. Insights into Uromodulin and Blood Pressure. Current Hypertension Reports (2024).
5. Genome-Wide Association Study of Blood Pressure Extremes Identifies Variant near UMOD Associated with Hypertension. PLOS Genetics (2010).
6. Association of Variants at UMOD with Chronic Kidney Disease and Kidney Stones—Role of Age and Comorbid Diseases. PLOS Genetics (2010).
7. Activation of the Bumetanide-sensitive Na+,K+,2Cl− Cotransporter (NKCC2) Is Facilitated by Tamm-Horsfall Protein in a Chloride-sensitive Manner*. Journal of Biological Chemistry (2011).
8. The serine protease hepsin mediates urinary secretion and polymerisation of Zona Pellucida domain protein uromodulin. eLife (2015).
9. Hepsin-mediated Processing of Uromodulin is Crucial for Salt-sensitivity and Thick Ascending Limb Homeostasis. Scientific Reports (2019).