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Kidney Disease & UMOD (THP)

A more reliable, independent biomarker is needed, and that biomarker is uromodulin.

Chronic Kidney Disease

The prevalence of chronic kidney disease (CKD) is approximately 10-15% of the world’s population, or about 700 million people.  The distribution varies by region, risk factors, and comorbidities.  The ultimate progression of CKD, Stage 5, also known as End-Stage Renal Disease (ESRD) is essentially kidney failure which would require dialysis and/or kidney transplantation.  The mortality rate of those with ESRD ranges from 10-20%.  Kidney transplants do improve survival rate but are still elevated compared to healthy individuals.  To avoid this outcome, early detection is key, as well as monitoring disease progression to avoid such an outcome.

 

The need for an available, easy, and abundant biomarker is crucial.  For decades, serum creatinine was the biomarker for detecting and monitoring kidney disease. To obtain a better result, albumin needs to be tested as well to obtain an albumin to creatinine ratio. A more reliable, independent biomarker is needed, and that biomarker is uromodulin.

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UMOD levels and how it relates to CKD –

  • Serum UMOD has been a reliable biomarker for detecting early stages of CKD and monitoring kidney function. As kidney function declines, lower concentrations of circulating serum UMOD are observed. [2]

  • Elevated serum UMOD levels were in correlation with a lower chance of future unfavorable kidney events. [3] 

  • Lower serum UMOD levels were shown to be a predictor for developing end-stage kidney disease.  [4,5,6]

  • Lower urinary UMOD levels have demonstrated and increased risk in developing CKD within a 10-year period. [7]

  • Elevated urinary UMOD levels have been shown to lead to CKD onset.

 

(NOTE: There is a genetic component to these findings that may need to be addressed.  On the UMOD gene there have been mention of alleles: rs12917707, rs4293393 and rs6497476.)

Background

Uromodulin (UMOD), also known as Tamms-Horsfall protein (THP), is the prominent protein found in healthy urine.  Originating from the tubular epithelial cells in the thick ascending limb and early distal convoluted tubule of the kidney, can also be found in circulating serum.  Normal range of UMOD in healthy urine is estimated to be between 10 to 150 mg/mL, while 1.5 to 10 ng/mL in healthy human serum. Varying concentration levels of UMOD in urine and serum have been associated with a variety of ailments and diseases such as acute kidney injury (AKI), chronic kidney disease (CKD), cardiovascular disease, glucose metabolism, and general health. [1] Because of this, UMOD has the potential to be an effective biomarker for these medical conditions.

 

Although UMOD has been studied for years, the exact function of this protein is still not completely clear.  Produced by the kidney epithelial cells, it has been linked to maintaining calcium and magnesium regulation through ion channel pathways, blood pressure regulation, regulation of the renal outer medullary potassium channel (ROMK), the sodium-potassium-chloride transporter (NKCC2), and general protection from urinary tract infections as well as the formation of kidney stones.  It has also been shown to bind to bacteria, activate neutrophils, cytokine binding for TLR4 activation, and interaction with IL-23 and IL-17 which cascades into circulation granulopoiesis and chemotaxis inflammation leading to cell death.  With regards to circulating serum UMOD, higher levels have been connected to a better metabolic profile, lower incidents of cardiovascular comorbidities, and an overall better 10-year mortality outlook. [1]

References

  1. Thielemans, R.; Speeckaert, R.; Delrue, C.; De Bruyne, S.; Oyaert, M.; Speeckaert, M.M.; Unveiling the Hidden Power of Uromodulin: A Promising Potential Biomarker for Kidney Disease. Diagnostics 2023, 13, 3077

  2. Risch, L.; Lhotta, K.; Meier, D.; Medina-Escobar, P.; Nydegger, U.E.; Risch, M. The Serum Uromodulin Level Is Associated with Kidney Function. Clin. Chem. Lab. Med. 2014, 52, 1755–1761.

  3. Bächle, H.; Sekula, P.; Schlosser, P.; Steinbrenner, I.; Cheng, Y.; Kotsis, F.; Meiselbach, H.; Stockmann, H.; Schönherr, S.; Eckardt,K.-U.; et al. Uromodulin and Its Association with Urinary Metabolites: The German Chronic Kidney Disease Study. Nephrol. Dial. Transplant. 2023, 38, 70–79

  4. Leiherer, A.; Muendlein, A.; Saely, C.H.; Brandtner, E.M.; Geiger, K.; Fraunberger, P.; Drexel, H. The Value of Uromodulin as a New Serum Marker to Predict Decline in Renal Function. J. Hypertens. 2018, 36, 110–118.

  5. Steubl, D.; Buzkova, P.; Garimella, P.S.; Ix, J.H.; Devarajan, P.; Bennett, M.R.; Chaves, P.H.M.; Shlipak, M.G.; Bansal, N.; Sarnak, M.J. Association of Serum Uromodulin With ESKD and Kidney Function Decline in the Elderly: The Cardiovascular Health Study. Am. J. Kidney Dis. 2019, 74, 501–509

  6. Lv, L.; Wang, J.; Gao, B.; Wu, L.; Wang, F.; Cui, Z.; He, K.; Zhang, L.; Chen, M.; Zhao, M.-H. Serum Uromodulin and Progression of Kidney Disease in Patients with Chronic Kidney Disease. J. Transl. Med. 2018, 16, 316.

  7. Garimella, P.S.; Biggs, M.L.; Katz, R.; Ix, J.H.; Bennett, M.R.; Devarajan, P.; Kestenbaum, B.R.; Siscovick, D.S.; Jensen, M.K.; Shlipak, M.G.; et al. Urinary Uromodulin, Kidney Function, and Cardiovascular Disease in Elderly Adults. Kidney Int. 2015, 88, 1126–1134

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